<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Spergen, Aswini</style></author><author><style face="normal" font="default" size="100%">Bal, Pranav V.</style></author><author><style face="normal" font="default" size="100%">Shameem, Asif Khan Shameer</style></author><author><style face="normal" font="default" size="100%">Joshy, Arun</style></author><author><style face="normal" font="default" size="100%">Nambiar, Anjana P.</style></author><author><style face="normal" font="default" size="100%">Andrews, Alex P.</style></author><author><style face="normal" font="default" size="100%">Sabapathi, Gokulnath</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Bis-subporphyrin-like boron(iii) complexes derived from indolo[2,3-a]carbazole-based cyclic bis-BODIPYs exhibiting persistent helical chirality</style></title><secondary-title><style face="normal" font="default" size="100%">Chemical Science</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2025</style></year><pub-dates><date><style  face="normal" font="default" size="100%">OCT </style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">16</style></volume><pages><style face="normal" font="default" size="100%">19164-19171</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;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;amp; ctdot;N and NH &amp;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;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.&lt;/p&gt;
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