Reaction of (Pt(CH 3 CN) 4 ] 2+ with 2,9-diphenyl-1,10-phenanthroline (dpp) in acetonitrile gave the cyclometalated complex (Pt(CNN-dpp)(CH 3 CN)](ClO 4 ) {here abbreviated as [7](ClO 4 )}, the structure of which has been established by 1 H- 1 H COSY and X-ray crystallography: triclinic, P1, a=13.322(3) A, b=13.877(3) A, c= 14.164(6) A, α=86.74(3) o , β=105.87(3) o , γ=108.93(2) o , V=2381.0(12) A 3 , Z=2