The crystal and molecular structures of dichloro [ N, O-(D,L)-diaminopropionic acid] platinum(II) and Dichloro [ N, O-(L)-lysine] platinum(II) monohydrate

Abstract

K 2PtCl 4 reacts with L-lysine and with D,L-diaminiopropionic acid (Dap) forming the neutral complexes [PtCl 2( N, O-Lys)]·H 20 ( 1) and [PtCl 2( N, O-Dap)], ( 2) respectively. Compound 1 is monoclinic, space group P2 1 with a = 11.262(3), b = 11.041(2), c = 9.690(2) Å, β = 102.07(5)°, V = 1178(1) Å 3 and Z = 4. Compound 2 is monoclinic, space group P2 1/ n with a = 8.777(1), b = 10.615(2), c = 7.947(1) Å, β = 94.98(3)°, V = 738(1) Å 3 and Z = 4. In both compounds, the zwitterionic ligands form an N,O-five membered chelate with the platinum atom. Structures 1 and 2 were refined to R values of 3.3% and 6.3% respectively.