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K. P. Balashev M. A. Ivanov T. V. Taraskina E. A. Cherezova 《Russian Journal of General Chemistry》2006,76(5):781-790
A comparative study of dipyrido-and dibenzo-substituted 1,4-diazines {dipyrido[f,h]quinoxaline (dpq), dipyrido[a,c]phenazine (dppz), 6,7-dicyanodipyrido[f,h]quinoxaline (dicnq), dibenzo[f,h]quinoxaline, dibenzo[a,c]phenazine, 6,7-dicyanodibenzo[f,h]-quinoxaline}, o-phenantroline (phen), and also of the complexes [Pt(N∧C)(N∧N)]+[(N∧C)? are deproronated forms of 2-phenylpyridine and 2-(2-thienyl)pyridine; (N∧N) is ethylenediamine, phen, dpq, dppz, dicnq] was carried out by the methods of 1H NMR, electronic absorption, and emission spectroscopy and by cyclic voltammetry. It was found that in frozen solutions of [Pt(N∧C)·(N∧N)]+ complexes the photoexcitation energy decay from two lowest in energy electronic excited states has isolated character and is localized on {Pt(N∧C)} and {Pt(N∧N)} metal-complex fragments: (d-π N∧C * ) and (d-π phen * ) [(N∧N) = phen, dpq, dicnq)] or (d-π N∧C * ) and (π-π diaz * ) [(N∧N) = dppz]. Thermal quenching of the luminescence from the (d-π phen * ) and (π-π diaz * ) states gives rise to luminescence of the complexes in liquid solutions at 293 K only from the (d-π N∧C * ) state. 相似文献
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