Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy called Emissive and reactive excimers in a covalently-linked supramolecular multi-chromophoric system with a balanced rigid-flexible structure, Author is Budyka, Mikhail F.; Gavrishova, Tatiana N.; Li, Vitalii M.; Potashova, Natalia I.; Fedulova, Julia A., which mentions a compound: 110-52-1, SMILESS is BrCCCCBr, Molecular C4H8Br2, HPLC of Formula: 110-52-1.
A novel multi-chromophoric system, triad, in which two styrylbenzoquinoline (SBQ) photochromes were connected by a balanced rigid-flexible linker comprising 2,3-naphthylene framework (a residue of 3-oxy-2-naphthoic acid) and tetramethylene groups, was designed and synthesized to study an excimer formation in the excited state. The 1H NMR data testified that triad exists in solution as folded conformers with asym. parallel-displaced SBQ units. Under light irradiation, in the triad, competitive photoisomerization and [2 + 2] photocycloaddition reactions were observed, both reactions being reversible. The photocycloaddition resulted in a tetrasubstituted cyclobutane. The red-shifted fluorescence spectrum and the appearance of a long-lived component in the triad fluorescence decay indicated formation of an ’emissive’ excimer. The photocycloaddition was assumed to occur in a ‘reactive’ excimer, in which the ethylene groups of the SBQ photochromes were located at a distance sufficient for the formation of the σ-bonds between them. Quantum-chem. d. functional theory (DFT) calculations at M06-2X/6-31G* level predicted the existence of the triad conformers with π-stacking interaction of SBQ photochromes, the structure of which is pre-organized for the excimer formation and photocycloaddition For the first time, both emissive and reactive excimers were exptl. observed in the multi-chromophoric system with two diarylethylene photochromes undergoing [2 + 2] photocycloaddition
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Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles