Abstract
New cyclometalated Pt(II) complexes bearing 1,2-phenylenediamine (pda) derivatives were synthesized and their chemical and electrochemical properties were investigated. Two Pt complexes, [Pt(bzqn) (pda)](PF 6) (bzqn = benzo[ h]quinoline, [ 1](PF 6): pda = 1,2-phenylenediamine, [ 2](PF 6): pda = 4,5-dimethyl-1,2-phenylenediamine), were synthesized by the reaction of (Bu 4N)[PtCl 2(bzqn)] with corresponding pda derivatives. The Pt–pda complexes were converted to Pt–bda (bda = 1,2-benzenediamide) complexes by treatment of 2 mol equiv of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), and they showed two-step reversible redox couples in cyclic voltammetry. The cyclometalated ligand gave a strong electronic effect to the bda ligand to take place the negative shift of the bda-based redox potentials.
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