Synthesis and properties of carbazolyl- and phenothiazinyl-bis-tetrazoles
Abstract
The possibility of introducing tetrazolyl groups into carbazole and phenothiazine molecules by substitution of hydrogen atoms of carbocycles has been investigated. It has been shown that the classical nitration-reduction methods can be used for preparation of 3,6-diaminocarbazole and 3,7-diaminophenothiazine which can be involved into reaction with triethyl orthoformate and sodium azide, giving in moderate yield 3,6-di(tetrazol-1-yl)carbazole and 3,7-di(tetrazol-1- yl)phenothiazine, respectively. The composition and structure of the obtained compounds were determined by elemental analysis, NMR and IR spectroscopy. The introduction of tetrazolyl groups into the carbazole and phenothiazine molecules shifts their maximum absorption in UV-VIS spectra into the short-wave region by 85 nm in the case of phenothiazine and by 15 nm in the case of carbazole. The latter is due to electron acceptor influence of tetrazole cycles and, as a consequence, redistribution of π-electron density in carbazolyl- and phenothiazinyl-bis-tetrazoles molecules as compared to the original carbazole and phenothiazine. It was found that 3,7-di(tetrazol-1-yl)phenothiazine is an acid-base indicator, whose aqueous solutions change colour in the pH range of 11.6–10.5.
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