01788nas a2200217   4500008004100000022001400041245014800055210006900203260000900272300001600281490000700297520098100304100002001285700002001305700003001325700001601355700002401371700002201395700002501417856012801442       2025                        eng d  a2041-652000aBis-subporphyrin-like boron(iii) complexes derived from indolo[2,3-a]carbazole-based cyclic bis-BODIPYs exhibiting persistent helical chirality0 aBissubporphyrinlike boroniii complexes derived from indolo23acar  cOCT   a19164-191710 v163 a<p>Herein, we report the synthesis of 11,12-dihydroindolo[2,3-a]carbazole (InC) 1 incorporating expanded porphyrinoid 8, and its boron(iii) complexes (8BF2 and 8BF). These macrocycles exhibit a `figure-eight' conformation that exists as a pair of helical enantiomers (P,P and M,M), confirmed by X-ray crystallographic analysis. The `figure-eight' structures are stabilized by intramolecular hydrogen bonds such as NH &amp; ctdot;N and NH &amp; ctdot;F interactions. The synthesized macrocycles demonstrate excellent stability under ambient conditions. Further, the helically-locked structure 8BF exhibited closely held InC units with a distance of 6.17 &amp; Aring; and enabled facile optical resolution using chiral HPLC. Circular dichroism spectroscopy of enantiopure 8BF shows the Cotton effect at 692 nm extending to the near-IR region with Delta epsilon up to 150 M-1 cm-1. The chiral induction of racemic macrocycle 8 was employed using enantiopure mandelic acids.</p>
1 aSpergen, Aswini1 aBal, Pranav, V.1 aShameem, Asif, Khan Shame1 aJoshy, Arun1 aNambiar, Anjana, P.1 aAndrews, Alex, P.1 aSabapathi, Gokulnath  uhttps://library.ncl.res.in/content/bis-subporphyrin-boroniii-complexes-derived-indolo23-acarbazole-based-cyclic-bis-bodipys