@article {49823,
	title = {Bis-subporphyrin-like boron(iii) complexes derived from indolo[2,3-a]carbazole-based cyclic bis-BODIPYs exhibiting persistent helical chirality},
	journal = {Chemical Science},
	volume = {16},
	year = {2025},
	month = {OCT },
	pages = {19164-19171},
	type = {Article},
	abstract = {<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 {\textquoteleft}figure-eight{\textquoteright} conformation that exists as a pair of helical enantiomers (P,P and M,M), confirmed by X-ray crystallographic analysis. The {\textquoteleft}figure-eight{\textquoteright} 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>
},
	issn = {2041-6520},
	doi = {10.1039/d5sc04279h},
	author = {Spergen, Aswini and Bal, Pranav V. and Shameem, Asif Khan Shameer and Joshy, Arun and Nambiar, Anjana P. and Andrews, Alex P. and Sabapathi, Gokulnath}
}
