Crystal and molecular structures of cis- and trans-dichlorobispyridine-platinum(II)

Abstract

The crystal structures of cis- and trans-dichlorobispyridineplatinum(II)[(I) and (II)] have been determined. Crystals of (I) are monoclinic, space group C2/c, with a= 9.408(5), b= 17.110(14), c= 15.270(7)Å, β= 98.53(4)°, Z= 8; crystals of (II) are triclinic, space group P, with a= 7.695(6), b= 7.091 (5), c= 5.542(5)Å, α= 87.6(1), β= 83.7(1), γ= 79.3(1)°, Z= 1. The structures were solved by heavy-atom techniques from 1 000 (I) and 1 032 (II) observed intensities, measured by diffractometer, and refined by least-squares methods to R 0.041 (I) and 0.068 (II).

Both complexes consist of discrete molecules with platinum showing the usual square-planar co-ordination. Shortest mean Pt ⋯ Pt distances are 4.967 (I) and 5.542 Å(II). Molecules of (I) pack in a manner similar to that of cis-[Pt(NH₃)₂Cl₂], but the large Pt ⋯ Pt distances preclude any metal–metal interaction.