Spectroscopic and electrochemical properties of mixed-ligand cycloplatinated complexes based on 2-(2-thienyl)pyridine and 2-phenylpyridine with 1,10-phenantroline and its 1,4-diazine derivatives |
| |
Authors: | K P Balashev M A Ivanov T V Taraskina E A Cherezova |
| |
Institution: | (1) Gertsen Russian State Pedagogical University, nab. r. Moiki 48, St. Petersburg, 19186, Russia |
| |
Abstract: | A comparative study of dipyrido-and dibenzo-substituted 1,4-diazines {dipyridof,h]quinoxaline (dpq), dipyridoa,c]phenazine (dppz), 6,7-dicyanodipyridof,h]quinoxaline (dicnq), dibenzof,h]quinoxaline, dibenzoa,c]phenazine, 6,7-dicyanodibenzof,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. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|