Optical Properties of Cyclometalated Pd(II) and Rh(III) Complexes Based on 2-(4-Biphenylyl)-6-Phenylbenzoxazole Luminophore with Ethylenediamine

摘要

Using the methods of electronic absorption and emission spectroscopy, we have studied the optical properties of cyclometalated [Pd(C^N)En]CH_3COO 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 π-π~* optical transitions by 1000-1800 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 (419-423 nm) and phosphorescence (511-532 nm) processes under low-temperature (77 K) photoexcitation.