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Optical properties of cyclometalated Pd(II) and Rh(III) complexes based on 2-(4-biphenylyl)-6-phenylbenzoxazole luminophore with ethylenediamine
Authors:E A Katlenok  M V Puzyk  K P Balashev
Institution:1. Herzen State Pedagogical University of Russia, St. Petersburg, 191186, Russia
Abstract:Using the methods of electronic absorption and emission spectroscopy, we have studied the optical properties of cyclometalated Pd(C??N)En]CH3COO and Rh(C??N)2En]Cl complexes of 2-(4-biphenylyl)-6-phenylbenzoxazole luminophore with ethylenediamine. We have shown that, along with a bathochromic shift of intraligand spin-allowed ??-??* optical transitions by 1000?C1800 cm?1, complexes are characterized by the occurrence of long-wavelength bands of a mixed nature (intraligand-metal-ligand charge transfer) in the range of 369??392 nm and by competing intraligand fluorescence (419?C423 nm) and phosphorescence (511?C532 nm) processes under low-temperature (77 K) photoexcitation.
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