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Oxonium Salts in the Synthesis and Spectral Behavior of Pyrano(pyrylium)‐mono methine Cyanine Dyes
Author(s) -
Koraiem Ahmed I. M.,
Shindy Hassan A.,
AbuElHamd Ragab M.,
Motaleb Ahmed M. A.
Publication year - 2019
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.3453
Subject(s) - chemistry , cyanine , iodide , oxazole , bromate , methyl iodide , medicinal chemistry , fluorescence , photochemistry , bromide , organic chemistry , physics , quantum mechanics
Pyrano‐ and pyrylium mono‐8[4(1)] and/or 5(6)‐[2(4)]methine cyanine dyes ( 6a–k , 7a–f ) were synthesized based on acyclic heterocyclic Schiff bases of pyrolo[3,2‐ d ]pyrazole[oxazole(imidazol‐6‐one)]‐1‐ium iodide salts, 5‐acetyl‐ N ‐aryl[pyrazolinyl(pyridinyl)]pyrolo‐[5,4‐ d ]pyrazolin‐iodide salts, and/or (anhydro bases) precursors ( 1a–i , 2a–I , 3a–i , 4a–i , and 5A,Ba–i ). The structure of pyrylium‐9‐chloride and/or iodide and their pyrano(pyrylium)‐mono‐8[4(1)] and 5(6)[2(4)]methine cyanine dyes was identified by elemental and spectral data. The absorption spectra of some selected dyes were investigated in 95% EtOH, polar (nonpolar) organic solvents and in universal buffer solutions to investigate the optimal conditions for the application of such dyes as photosensitizers.