Sabapathi G, Prasad Nambiar A, Nag P, Mariam Ipe R, Reddy Vennapusa S. Conformationally Locked Cyclo[2]Dipyrrins Linked with Anthracene Subunits: Synthesis and Chiroptical Properties.
Angew Chem Int Ed Engl 2023:e202306566. [PMID:
37255482 DOI:
10.1002/anie.202306566]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 05/28/2023] [Accepted: 05/31/2023] [Indexed: 06/01/2023]
Abstract
Herein, we report the synthesis of anthracene containing twisted Cyclo[2]dipyrrin 1 utilizing a non-planar building block, 1,5-dipyrrylanthracene (1,5-DPA). The non-planar nature of macrocycle enhanced the solubility and helps in structural characterization. Macrocycle 1 adopts a twisted 'figure of eight' conformation stabilized by strong intramolecular H-bonding interactions and exist as a pair of helical enantiomers as revealed from X-ray crystallographic analysis. More importantly, the sterically locked structure offered facile optical resolution using chiral HPLC. The (P,P) and (M,M) enantiomers shows moderate chiroptical properties such as absorption dissymmetry factor |gabs| in the order of 10-3, and luminescence dissymmetry factor |glum| of 3.8 x 10-3 and 2.9 x 10-3 at 702 nm respectively.
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