{Although|Even though|Though|Despite the fact that|While} the {unique|distinctive|special|exclusive|exceptional|one of a kind} structure of helicenes resembles molecular springs, the effects of {pressure|stress} on their extension–contraction cycles have {rarely|seldom|hardly ever} been explored. Herein, we investigated the fluorescence of two π-extended [n]helicenes with {different|various|distinct|diverse|unique|distinctive} helical lengths n, {here|right here} named [7] and [9], {under|below|beneath} {high|higher} {pressure|stress} {in a|inside a|within a} diamond anvil cell. {Based|Primarily based} on experimental {results|outcomes|final results|benefits} and theoretical calculations, the mechanical and fluorescent properties {of the|from the|in the|on the|with the|of your} molecular springs {were|had been|have been} {found|discovered|identified|located} {to be|to become} influenced {not only|not just|not merely|not simply} by the intermolecular packing, {but also|but additionally|but in addition} by the intramolecular π-π interactions {between|in between|among|amongst|involving} their overlapping helixes. As a {more|much more|a lot more|far more|additional|extra} rigid molecular spring, [9] exhibited a {more|much more|a lot more|far more|additional|extra} sensitive response of its fluorescence to hydrostatic {pressure|stress} than [7]. Our {results|outcomes|final results|benefits} {provide|offer|supply|give|present|deliver} new insights into structure-property relationships {under|below|beneath} high-pressure {conditions|circumstances|situations} and {verify|confirm} the {potential|possible|prospective} of helicenes as molecular springs for future applications in molecular machines. 2-Hydrazinylthiazole hydrochloride site 5-Iodobenzo[b]thiophene web PMID:28440459
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