Structural Chemistry of [MX2(bipy)] (M = Pd, Pt; X = Cl, Br, I): the Yellow Polymorph of Dichlorido(2,2'-bipyridine) platinum(II) and Diiodido(2,2'-bipyridine)palladium(II), and Overview of this System

Synchrotron data have been used to determine the structures of the yellow polymorph of dichlorido(2,2'-bipyridine)platinum(II) (1), and diiodido(2,2'-bipyridine)palladium(II) (2), allowing a detailed comparison of the crystal chemistry of [MX₂(bipy)] (M = Pd, Pt; X = Cl, Br, I) which exhibit polymorphism involving nine structures distributed over five space groups. Complex 1 crystallizes in space group Pbca (a = 18.2540(7), b = 15.6970(7), c = 7.3560(6) Å), and 2 in space group C2/c (a = 17.149(1), b = 9.8050(8), c = 7.548(1)Å, β = 110.72(1) °).