STRUCTURE, OPTICAL AND ELECTROCHEMICAL PROPERTIES OF BINUCLEAR COMPLEXES WITH PLATINATED 2-PHENYLBENZOTHIAZOL AND BRIDGING 2-MERCAPTO-DERIVATIVES OF PYRIDINE, PYRIMIDINE, BENZOTHIAZOLE, AND BENZOXAZOLE
Binuclear [Pt(bt)m-(N^S)] 2 complexes (bt - is the deprotonated form of 2-phenylbenzothiazole, (N^S) - = 2-mercaptopyridineate, 2-mercaptopyrimidineate, 2-mercaptobenzothiazoleate, 2-mercaptobenzoxazoleate ions) are characterized by the following methods: X-ray crystallography, 1Н and 195Pt NMR spectroscopy, electronic absorption and emission spectroscopy, cyclic voltammetry. The occurrence of the Pt-Pt chemical bond and complexes in both crystalline state and solution in the form of cis -N (bt),S-binding isomers with the asymmetrical arrangement of two cyclometalated and two bridging ligands is shown. Long-wavе absorption bands and luminescence of the complexes in the red spectral range are due to spin-allowed and spin-forbidden optical charge transfer transitions from the metal-metal bond to the metalated ligand. In cyclic voltammetry, two-electron redox waves of the complexes are attributed to metal- and ligand-centered processes involving s* HOMO and p*(bt) LUMO of the complexes.