ライフサイエンスコーパス: helicene

1 ignificantly lower than for pristine carbo[7]helicene.

2 tra maxima when compared to unsubstituted [6]helicene.

3 tely 25% lower than that of unsubstituted [6]helicene.

4 to those of the propeller-shaped hexapole [7]helicene.

5 a major method for producing small amount of helicenes.

6 the chloro- and methoxy-substituted diaza[5]helicenes.

7 ger computed tensor elements than the chiral helicenes.

8 lectron delocalization for this series of [7]helicenes.

9 ding block for long [n]helicenes and oligo[7]helicenes.

10 s surpassing those of previously reported [7]helicenes.

11 from perylene diimide-based twistacenes and helicenes.

12 properties of biscarbazole-embedded diaza[7]helicenes.

13 rrelated to the diastereomeric ratios of the helicenes.

14 r previously reported classical and expanded helicenes.

15 e synthesis of chalcogen-containing hetero[5]helicenes.

16 to access configurationally stable expanded helicenes.

17 rically/unsymmetrically functionalized B,N,B-helicenes.

18 n the crystal structures of both fluorinated helicenes.

19 rent substituents on the properties of these helicenes.

20 Molecular structures of racemic [7]helicene 1 and its benzodithiophene building block 2 are

21 The functionalized, enantiomerically pure [7]helicene 1 derived from bis(benzodithiophene) functional

22 [7]Helicene 1 possesses a moderately increased electron del

23 The doubly-reduced helicene 1(2-) has been characterized by single-crystal

24 Unlike carbo[6]helicene 1, the 4,13-substituted derivative 2 follows a

25 hemical reduction of a benzo-fused double [7]helicene (1) with two alkali metals, K and Rb, provided

26 The triply- and tetra-reduced helicenes, 1(3-) and 1(4-) , have been crystallized toge

27 ene (6) and 1,2,3,4,13,14,15,16-octafluoro[6]helicene (15), were synthesized via the Wittig reaction

28 As a result of this helical organization, [6]helicene 2 exhibits a unique modification in its ECD spe

29 formation of bromo-substituted B,N,B-benzo[4]helicenes 2 a/2 b via intramolecular borylation and sequ

30 ed to develop a novel set of photoresponsive helicenes 2-4 that lead to colored intermediates exhibit

31 Enantiopure helicene 3, either without solvent or in dodecane (but n

32 ymmetric and unsymmetric B,N,B-doped benzo[4]helicenes 3-6 a/b have been achieved in good yields, usi

33 ion in a series of thiophene-based dibromo[7]helicenes (4-6) with different helix structures is inves

34 The specific rotation of tetrafluoro[6]helicene 6 enantiomers was found to be approximately 25%

35 ted at terminal rings, 1,2,3,4-tetrafluoro[6]helicene (6) and 1,2,3,4,13,14,15,16-octafluoro[6]helice

36 tric, polyaromatic hydrocarbons and their [5]helicene, [6]helicene, and [7]helicene isomers.

37 ent helical nanoribbons incorporate multiple helicenes, a class of contorted polycyclic aromatic mole

38 However, in the case of aza[9]helicene, along with the expected angular-angular cycliz

39 elective reactions and methods for producing helicenes, along with their functionalization.

40 o new compounds such as 3,11-di-tert-butyl[4]helicene and 1,8,9-perinaphthothioxanthene.

41 pared to those of analogous carbon-sulfur [7]helicene and [7]helicenes derived from benzodithiophene

42 ch is demonstrated by the assembly of an aza-helicene and also by a gram-scale reaction.

43 Synthesis and study of aza[7]helicene and aza[9]helicene is presented in this paper.

44 Racemic [7]helicene and four other macrocyclic products of the anne

45 sis of an alkyne-functionalized expanded [11]helicene and its single-step transformation into two str

46 sent unprecedented structures of septuple [4]helicene and octuple [4]helicene, respectively.

47 e process always starts from one edge of the helicene and progresses along the rings until the other

48 The intrinsic relationship between helicenes and circulenes is of fundamental interest and

49 his review, we discuss the rich chemistry of helicenes and helicenoids containing main-group elements

50 to observe a chiroptic response in expanded helicenes and is a significant synthetic improvement ove

51 is an attractive building block for long [n]helicenes and oligo[7]helicenes.

52 l properties when compared to the related [n]helicenes and rylene diimides.

53 Utilizations of non-racemic helicenes and their applications will be treated in the

54 nantiopure fully aromatic [5]-, [6]-, and [7]helicenes and their functionalized derivatives.

55 th a chiral small-molecule additive (1-aza[6]helicene) and intrinsically chiral-sidechain polymers us

56 matic hydrocarbons and their [5]helicene, [6]helicene, and [7]helicene isomers.

57 a stilbene photocyclization to construct the helicene, and a Stille coupling to incorporate the DMAP

58 ension to a nonphotochemical synthesis of [n]helicenes, and the ease of isolation of the products are

59 rotation, and cyclic voltammetry) of the [7]helicene are described.

60 Alternatively, enantiomers of the [7]helicene are obtained via resolution using menthol-based

61 Expanded helicenes are a class of chiral nanographenes with a scr

62 Oxa-, thia-, and selena[5]helicenes are accessed from common ortho-fluoro-ethynyla

63 reactions that differentiate the ends of the helicenes are also described.

64 Expanded helicenes are an emerging class of helical nanocarbons c

65 Cationic triangulenes and helicenes are highly stable carbocations with planar and

66 Expanded helicenes are large, structurally flexible pai-framework

67 olecular lemniscate, in which two homochiral helicenes are linked via the formation of two azine moti

68 Expanded helicenes are therefore an intriguing target for explora

69 Electronic indices suggest that the helicene-arm systems have significantly smaller electron

70 ld a different degree of aromaticity for the helicene arms than obtained in the calculation of the el

71 ecting the central six-membered rings to the helicene arms.

72 in the stacked six-membered rings and in the helicene arms.

73 Exploiting the simplest helicene as a benchmark, we show that the gas phase reac

74 re, we use the racemization mechanism of [12]helicene as a model to demonstrate the capabilities of O

75 ry utilizing tetracene, [4]phenacene, and [4]helicene as benchmarks contesting established ideas that

76 onal stability compared to 1 and pristine [7]helicene as well as its [5]helicene congener.

77 rationally stable enantiopure and racemic [5]helicenes as linkers in the backbone of 2D [5]HeliCOFs a

78 ssure conditions and verify the potential of helicenes as molecular springs for future applications i

79 omparable to [6]helicene or carbon-sulfur [7]helicene, as determined by the anisotropy factors, |g| =

80 using a class of chiral nanocarbons-expanded helicenes-as a proof of concept.

81 es in the (electronic) structure of 1 as the helicene backbone becomes more compressed and twisted up

82 delocalization of the spin density over the helicene backbone.

83 the carbon atoms located on the edge of the helicene backbone.

84 luorenyl in 1 and triarylamine-coupled aza[7]helicene-based building blocks in 2.

85 ic double-[4]helicene termini and a rigid [6]helicene-based core within their helical superstructures

86 ched with this proof-of-concept single-layer helicene-based device is sufficient to provide real-worl

87 An enantiopure helicene-based ligand (M or P configuration) is coupled

88 etonate), where the chirality is held by the helicene-based ligand, were studied in the near-infrared

89 ent starting material for the preparation of helicene-based push-pull molecules, which incorporated a

90 rs allow the achievement of the first purely helicene-based redox-triggered chiroptical switches.

91 stepwise reduction of 1, the central axis of helicene becomes more compressed upon electron addition

92 During the racemization of helicene, between opposite helical structures, the screw

93 licene-bridged (1,4)cyclophane and triply [5]helicene-bridged (1,3,5)cyclophane via calculations of t

94 study explores the aromaticity of doubly [5]helicene-bridged (1,4)cyclophane and triply [5]helicene-

95 s studied for the enantiopure 6,13-dicyano[7]helicene building block.

96 es were originally reported for making lower helicenes, but for many years, photochemical synthesis h

97 into the cavity of a diformyl expanded [11]-helicene by mild, efficient, and reversible imine conden

98 try was obtained starting from 7,8-dibromo[5]helicene by Yamamoto nickel(0) couplings.

99 n of a small chiral molecule (2,2'-dicyano[6]helicene) by the use of organic and inorganic templating

100 )) with vinylacetylene (C(4)H(4)) yields [4]-helicene (C(18)H(12)) along with atomic hydrogen via a l

101 n to this problem present since the birth of helicene chemistry in 1956 by developing a general synth

102 Helicene chemistry is being considered as an expanding a

103 Helicene chemistry is now at a developmental stage, wher

104 ytic systems has promoted the development of helicene chemistry, toward a library of tailor-made and

105 Helicenes, chiral members of the family of polyaromatic

106 were revealed via analysis of a monoanionic helicene co-crystallized with {K(+) (18-crown-6)(THF)} a

107 of C(2)- and C(1)-symmetric pyrene-fused [7]helicene compounds 1 and 2, respectively.

108 1 and pristine [7]helicene as well as its [5]helicene congener.

109 Here, we report the syntheses of expanded helicenes containing 15, 19, and 23 rings on the inner h

110 helicene, which after photoexcitation of the helicene core generates a weakly coupled three-spin syst

111 uences of adding two electrons to the double helicene core in the SSIT without metal binding and reve

112 nfluenced by the substitution pattern in the helicene core that affects the mutual orientation of the

113 s, an increase in the twisting of the double helicene core upon charging was observed.

114 limide moieties are attached at both ends of helicene core were synthesized by effective two-step str

115 The first racemization-stable helicene derivatives fluorinated at terminal rings, 1,2,

116 1 and 69% for 2), both being outstanding for helicene derivatives.

117 f analogous carbon-sulfur [7]helicene and [7]helicenes derived from benzodithiophene to provide a cor

118 We report two new helicenes derived from the double fusion of an acene wit

119 s of carba- or oxa[5]-, [6]-, [7]-, and -[19]helicene (di)thiols was prepared.

120 The configuration of the diaza[6]helicene diastereomers was demonstrated by time-dependen

121 The resulting helicenes display strong molar circular dichroism up to

122 nd sterically crowded geometry, 7,12-dioxa[8]helicene displayed a large HOMO-LUMO gap, typical of aro

123 The phenylene-bridged helicene displays a substantially higher enantiomerizati

124 -molecule conductivity of the longest oxa[19]helicene dithiol derivative was studied by the scanning

125 n on derivatives bridging triaryl methyl and helicene domains, we have achieved the regioselective tr

126 eview on the preparations of enantioenriched helicenes, either from an asymmetric synthesis or from a

127 cal bilayers endowed with [9], [10], and [11]helicenes embedded in their structure, respectively.

128 nship between the strain and racemization in helicene-embedded nanohoops.

129 A fresh look on helicenes' enantiomerization process with a focus on rin

130 ble chiral induction strategy with dimenthyl helicene esters synthesized in a 70:30 ratio of isomers

131 ws that each individual ring in 7,12-dioxa[8]helicene exhibits a strong aromatic character, supportin

132 As more rings are added to the helicene, extra steps are appended to the distortion wav

133 Herein, we report a helicene featuring an indenofluorene-bridged bisthioxant

134 However, some compounds such as helicenes (Figure 1) are chiral due to their screwlike g

135 investigations into the mechanism of the [4]helicene formation lead to the first isolation of the pr

136 on, in which one benzene ring is fused to [5]helicene, forming a phenalenyl subunit.

137 An infinitene isomer composed of two [5]helicene fragments connected to two stacked phenyl rings

138 products where the formation of multiple [6]helicene fragments is avoided by the formation of unusua

139 The ability of the twisted helicene frame to delocalize the negative charge was pro

140 Incorporation of a five-membered ring into a helicene framework disrupts aromatic conjugation and pro

141 build-up and distribution over the contorted helicene framework upon each electron addition, and the

142 The helicene framework was specifically utilized to position

143 g the nitrogen atom to the third ring of the helicene framework.

144 ein, the recent advancements in the field of helicene functionalization are discussed with an emphasi

145 ene of formula C(66)H(36) with three carbo[7]helicenes fused within a central six-membered ring was d

146 ison with a nonradical bis-dibenzoate capped helicene H6-bis-BENZ experimentally validates the result

147 the (P) configuration and toward it when the helicene has the (M) configuration.

148 ons point away from the ring system when the helicene has the (P) configuration and toward it when th

149 hesis of two different series of cationic [5]helicenes has been achieved including, in dioxa series,

150 Diversely functionalized diaza[5]helicenes have been synthesized starting from 6,9-dichlo

151 c)(3)] (X = P, M; L = 3-(2-pyridyl)-4-aza[6]-helicene; hfac = 1,1,1,5,5,5-hexafluoroacetylacetonate),

152 A series of hexapole helicenes (HHs) and nonuple helicenes (NHs) were prepare

153 These PDI-helicene homologs exhibit very different structural and

154 em benzannulations to give substituted aza[5]helicenes in 82-83% yield.

155 rangement of (dimethylcarbamothioyl)oxy (oxa)helicenes in a flow reactor or nucleophilic substitution

156 lecular wires along with racemic mixtures of helicenes in deep space.

157 te electronic spectroscopy of these thiaza[5]helicenes in toluene and acetonitrile.

158 that the configurational stability of the [5]helicene increases with increasing nanohoop size, with a

159 ition or 1- and 12-positions of the hetero[5]helicene inner core surface.

160 th bromines at the terminal positions of the helicene inner rim and multiple solubilizing alkyl group

161 4,11-substitution pattern on the dimethyl[5]helicene introduces a platform for designing future gene

162 Racemic synthesis of [7]helicene is based upon iterative alternation of two step

163 The [7]helicene is configurationally stable at room temperature

164 thesis and study of aza[7]helicene and aza[9]helicene is presented in this paper.

165 space electronic delocalization when the PDI-helicene is reduced.

166 two-electron reduction of OBO-fused double[5]helicene is reversible.

167 Also, a DMQA helicene is used as FRET acceptor in SMILES nanoparticle

168 c borylation of phenanthroline-derived aza[5]helicenes is presented, resulting in the incorporation o

169 A new approach to fused helicenes is reported, where varied substituents are rea

170 The self-assembly of these [6]helicenes is strongly influenced by the substitution pat

171 s and their [5]helicene, [6]helicene, and [7]helicene isomers.

172 Interestingly, the helicene length defines the overlapping degree between t

173 gs, thus confirming the strong impact of the helicene length on the properties of this new family of

174 nonhollow supramolecular and macromolecular helicene-like architectures.

175 acene-based CP-PAH was contorted owing to [5]helicene-like arrangements, while the pyrene- and peryle

176 cribe a large-scale synthesis of a series of helicene-like compounds based on a dibenzo[c]acridine fr

177 :6,7]indaceno[1,2,3-lm]perylene that possess helicene-like fragments.

178 t dyes combine a cationic hemicyanine with a helicene-like motif to form a new blueprint for chiral s

179 ission materials, while contorting PDIs into helicene-like structures leads to nonlinear amplificatio

180 Such [7]helicenes may be viewed as fragments of the unprecedente

181 thermodynamically less stable isomers of [4]-helicene might be important in combustion flames as well

182 An efficient synthetic route to fuse [5]helicene moieties around the phthalocyanine core is repo

183 actions between the perylene-diimide and the helicene moieties.

184 and theoretical techniques reveals that the helicene moiety is a noninnocent ligand bearing a signif

185 calization of the first two electrons in the helicene moiety leads to an unprecedented site-specific

186 The helicene moiety was constructed by the Diels-Alder react

187 The combination of a bis-alkynyl-helicene moiety with two iron centers leads to novel ele

188 f a nitrogen atom into the outer edge of the helicene molecule has a severe impact on certain physico

189 excited lifetime in a heavy atom-free bodipy helicene molecule.

190 ism (FDCD) from single (bridgedtriarylamine) helicene molecules by using an excitation wavelength (45

191 ary of tailor-made and highly functionalized helicene molecules.

192 geometries arising from the incorporated [4]helicene motifs along their peripheries, as also evidenc

193 A series of aza[n]helicenes (n = 4-7) was synthesized using a photocyclode

194 ) (:C^N) have been prepared, where :C^N is a helicene-N-heterocyclic carbene (NHC) ligand and X=Cl or

195 in the helical carbenic ligand and efficient helicene-NHC-Ir interaction.

196 ries of hexapole helicenes (HHs) and nonuple helicenes (NHs) were prepared from 1,3,5-tris[2-(aryleth

197 characterization of enantiomerically pure [6]helicene o-quinones (P)-(+)-1 and (M)-(-)-1 and their ap

198 emate of an overcrowded triply fused carbo[7]helicene of formula C(66)H(36) with three carbo[7]helice

199 uents compared to the unsubstituted thiaza[5]helicene on the structural parameters and studied the st

200 optical properties that are comparable to [6]helicene or carbon-sulfur [7]helicene, as determined by

201 Axially chiral organic scaffolds, such as helicenes or twisted acenes, are powerful motifs in chir

202 A gallamide-containing pseudoenantiomeric helicene pair bearing a (10R,11R)-dimethoxymethyldibenzo

203 on the formation of acenes, phenacenes, and helicenes-polycyclic aromatic hydrocarbons (PAHs) that a

204 The new helicenes possess low racemization barriers, as demonstr

205 One of the solvent polymorphs of the [7]helicene possesses pi-stacked columns of opposite enanti

206 omerization barrier (22.1 kcal/mol) than its helicene precursor (<11.9 kcal/mol), which makes this a

207 genation successfully transformed the double helicene precursor 2, i.e., 12a,26a-dibora-12,13,26,27-t

208 retains the configurational lability of the helicene precursor.

209 olism of 1 was due to formation of the azoxy-helicene product, pyrido[3,2-f]quinolino[6,5-c]cinnoline

210 ting a single regioisomer of the cationic [4]helicene product.

211 lator strengths of the DHP precursors to the helicene products were a factor of 4.8-9.2 smaller than

212 dergoing reductive elimination to afford the helicene products.

213 n, which can lead to further modification of helicene properties, as manifested here in the fluoresce

214 ive dearomatizations of a readily accessible helicene provided a divergent route to four electron-def

215 he increased diameter and length of the [23]-helicene, providing guiding design principles for high d

216 For instance, the resolution of some helicene racemates by "hand picking" of a few homochiral

217 xy-3-phenylbenzo[e][1,2,4]triazines leads to helicene radicals.

218 licenol triflates add to another ring of the helicenes rather than to an external furan molecule.

219 hile the topology and stereochemistry of the helicene remain unchanged.

220 Helicates and helicenes represent two prominent classes of synthetic m

221 Although the unique structure of helicenes resembles molecular springs, the effects of th

222 tures of septuple [4]helicene and octuple [4]helicene, respectively.

223 e leading to sterically less demanding aza[7]helicene resulted in smooth reaction, and only the desir

224 ucing metal-vinyl ruthenium moieties onto [6]helicene results in a significant enhancement of the chi

225 same handedness for either the twistacene or helicene (right-handed helices vs left-handed helices) p

226 iangulenium derivatives and two cationic [5]-helicene salts.

227 d upon introduction of nitrogen atoms in the helicene scaffold, leading to particularly good fluoresc

228 Chemically reducing the helicenes shifts the absorption edge of the ECD spectra

229 The solid-state structures of these helicenes show a tendency for pi-stacking interactions i

230 The effect of the nitrogen presence in the helicene skeleton on the physicochemical properties of t

231 The helicene skeleton was substituted by a variety of O-, S-

232 x-step one pot procedure that constructs the helicene skeleton), and because chromatography is not re

233 rtion is consecutively transferred along the helicene skeleton, head to tail.

234 hich two imide units are connected via an [n]helicene skeleton.

235 terochiral interaction between the different helicene species, suppressing the formation of the pure

236 Molecular architectures incorporating helicenes, spirocycles, or non-benzenoid motifs enable t

237 Such [7]helicene structure, functionalized with bromines at the

238 ed bistetracene revealed a twisted double [5]helicene structure, indicating that this synthesis is ap

239 able to control the helicity of flexible [4]helicene subunits by UV-vis, CD spectroscopy, X-ray crys

240 Moreover, the embedded [7]helicene subunits in these NGs result in stable chiralit

241 by aromaticity have been illustrated for the helicene system using DFT studies.

242 Connecting helicene templates to the Origins of Life ultimately cha

243 orate two conformationally dynamic double-[4]helicene termini and a rigid [6]helicene-based core with

244 ving broad chiral absorption, producing a [6]helicene that absorbs a single handedness of light acros

245 d to access a selenophene-annulated expanded helicene that, in contrast to its benzannulated analogue

246 exibility of this internal cavity results in helicenes that are often difficult to isolate as single

247 zoquinone make it easy to prepare nonracemic helicenes that are substituted by hydroxyl groups at the

248 A series of cationic helicenes that display increasing chiroptical response i

249 esponsible for the preferential formation of helicenes that has been observed as a unique and useful

250 access to several members of a new class of helicenes, the "expanded helicenes", which are composed

251 Unlike most conventional multiple helicenes, the HHs and NHs investigated herein possess a

252 y chiral polyaromatics represented by iconic helicenes, their availability in an optically pure form

253 rovides quasi-[8]circulenes for all three [7]helicenes, though only 4 gives a good isolated yield.

254 tacked hexabenzocoronenes (HBCs) joined by a helicene, thus resembling van der Waals layered 2D mater

255 ating layers can either force 2,2'-dicyano[6]helicene to adopt a face-on orientation and self-assembl

256 poration of a boryl unit into two termini of helicenes to afford quasi-[7]circulenes.

257 lows to impart the chiral information of the helicenes to the overall supramolecular system, resultin

258 kly coupled three-spin system comprising the helicene triplet (S = 1) and the two TEMPO radicals (S =

259 The helicenes undergo excellent complementary photoswitching

260 ed to their parent chiral models lacking the helicene unit.

261 helicene compound, composed of three carbo[7]helicene units fused within a central six-membered ring.

262 ed molecules differ in the fusing mode of [7]helicene units with pyrene via six- and seven-membered r

263 AH) embedding six enantiomerically stable [5]helicene units.

264 uation of aromaticity in this triple carbo[7]helicene, utilizing magnetic and electronic criteria, le

265 c aromatic hydrocarbons such as [5]- and [6]-helicene via stepwise ring annulation through bimolecula

266 A synthetic route to racemic helicenes via a vinylacetylene mediated gas phase chemis

267 The first approach to pyrazole-containing helicenes via sydnone-aryne [3 + 2]-cycloaddition is des

268 od for the formation of dimeric dibenzofuran helicenes via the reaction between diaryl sulfoxides and

269 scale) and (2) two arylene-bridged expanded helicenes via Zr-mediated, formal [2+2+n] cycloadditions

270 preferential crystallization of this chiral helicene-viologen hybrid has been established to obtain

271 The racemization of the triply fused carbo[7]helicene was determined to proceed at a rate of k(rac) =

272 le substituent in the bay area of a thiaza[5]helicene was not enough to prevent enantiomerization at

273 In this case, the helical compound aza[9]helicene was predominantly formed at lower concentration

274 Racemic 9,10-diketo[7]helicene was successfully separated into enantiomers usi

275 The generation of a chiral helicity in helicenes was observed because of a severe intramolecula

276 changed electronic structure in fluorinated helicenes was reflected in a slight shift of UV-vis abso

277 icochemical properties of the prepared aza[n]helicenes was studied and compared to those of the paren

278 A series of bay-substituted thiaza[5]helicenes was synthesized to investigate the effect of d

279 A variety of S-shaped and U-shaped helicenes were formed under thermal conditions.

280 C(2) symmetric chiral 7,12-dioxa[8]helicenes were synthesized through a series of photochem

281 n the present study, carbazole-based diaza[6]helicenes were synthesized utilizing versatile quinoline

282 eparation of a novel substituted tetrathia[7]helicene where three new C-C bonds were formed in a one-

283 s of a new class of helicenes, the "expanded helicenes", which are composed of alternating linearly a

284 o TEMPO radicals bridged by a chiral carbo[6]helicene, which after photoexcitation of the helicene co

285 The expanded [23]-helicene, which is 7 rings longer than any known single

286 ized starting from 6,9-dichloro-5,10-diaza[5]helicene, which was prepared from a readily available qu

287 e the effect of strain on racemization of [5]helicene, which we embedded in three different [m]cyclop

288 en combined with methanolic HCl gives the [7]helicene whose peripheral side chains are all methoxyls

289 ace groups, homochirality in a crystal for a helicene with an extremely low enantiomerization barrier

290 the thiophene rings are annelated into a [7]helicene with cross-conjugated pi-system, are described.

291 Chemical reduction of OBO-fused double[5]helicene with Group 1 metals (Na and K) has been investi

292 a configurationally stable 1,14-dimethyl-[5]helicene with radical stabilizing groups at the 4,11-pos

293 ed to quantify the distortion of even-number helicenes with 8-14 rings.

294 r nucleophilic substitution of dichloro (oxa)helicenes with alkanethiolates were used in the sulfanyl

295 ated the fluorescence of two pai-extended [n]helicenes with different helical lengths n, named [7] an

296 These thiaza[5]helicenes with different substituents were prepared in a

297 ical properties; however, there are very few helicenes with extraordinary chiroptical response over a

298 erties are similar to those for analogous [7]helicenes with relatively lower electron delocalization,

299 implicate the configuration of the double-[6]helicene within the larger nanoribbon as the source of t

300 DFT calculations, we find that the double-[4]helicenes within both nanoribbons orient similarly in so