Helically twisted conductive nanocarbon {materials|supplies|components} are applicable to optoelectronic and electromagnetic molecular devices {working|operating|functioning} {on the|around the} nanometer scale. Herein, we report the synthesis of per-peri-perbenzo[5]- and [9]helicenes {in addition to|along with|as well as} previously reported π-extended [7]helicene. The homogeneously π-extended helicenes {can be|may be|could be|might be|is often|is usually} regarded as helically fused oligo-phenanthrenes. The HOMO−LUMO gap decreased {significantly|considerably|substantially|drastically} from {2|two}.14 to 1.15 eV with {increasing|growing|escalating|rising} helical length, suggesting the {large|big|huge|massive|substantial|significant} {effective|efficient|successful|powerful|productive|helpful} conjugation length (ECL) {of the|from the|in the|on the|with the|of your} π-extended helical framework. The {large|big|huge|massive|substantial|significant} ECL of π-extended helicenes is attributed {to the|towards the|for the} {large|big|huge|massive|substantial|significant} orbital interactions {between|in between|among|amongst|involving} the phenanthrene subunits {at the|in the} 9- and 10-positions, which {form|type|kind} a polyene-like electronic structure. {Based|Primarily based} {on the|around the} experimental {results|outcomes|final results|benefits} and DFT calculations, the ultrafast decay dynamics {on the|around the} sub-picosecond timescale {were|had been|have been} attributed {to the|towards the|for the} low-lying conical intersection. Methyl 5-bromo-6-fluoropicolinate Chemscene Buy944317-53-7 PMID:23847952
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