02168nas a2200253   4500008004100000245009100041210006900132260000900201300001500210490000700225520131300232653003801545653002301583653001301606653001701619653001801636100002401654700002201678700001801700700003001718700001801748700003001766856011801796       2025                        eng d00aChiroptical amplification of [7]-helicene nanographene by additional helical chirality0 aChiroptical amplification of 7helicene nanographene by additiona  cFEB   ae2024207670 v643 a<p>
	Nanographenes have captivated scientific interest since the pioneering discovery of graphene. Recently, attention has shifted towards exploring chiral and nonplanar nanographenes, for their distinct optical, chiroptical, and electronic properties. Despite the growing acceptance of helicenes, the research on inducing helical chirality on pi-extended derivatives to boost chiroptical properties remains unattended. In our study, we introduce a new pi-extended [7]-helicene resulting from the condensation of diamines with 3,6-dibromophenanthrene-9,10-dione, complemented by two hexabenzocoronene arms in the periphery. Notably, the nanographene containing binaphtho-[1,4]diazocine, compared to the corresponding phenazine, exhibits a remarkable average 2.5, 5, and 10-fold enhancements in quantum yield, dissymmetry factor, and brightness, respectively, when measured in five different solvents. These improvements underscore the significance of the induced helical chirality by the antiaromatic binaphtho-[1,4]diazocine in influencing the chiroptical properties of the helical nanographene. Our research represents a significant stride toward unlocking the potential of pi-extended helicenes and lays the groundwork for further exploration in designing and synthesizing new chiral nanomaterials.</p>
10acircularly polarised luminescence10adissymmetry factor10ahelicene10ananographene10aquantum yield1 aDongre, Sangram, D.1 aVenugopal, Geethu1 aKumar, Viksit1 aJadhav, Ashok, Badrinaray1 aKumar, Jatish1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/chiroptical-amplification-7-helicene-nanographene-additional-helical-chirality