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A novel case of polymorphism in platinum(II) complexes is reported. Single crystals of [PtBr 2 (2,9-dimethyl-1,10-phenanthroline)] were obtained at room temperature from a dilute dichloromethane/pentane (1:3, v/v) solution of the title compound in the presence of guanosine. The space group resulted to be  Pbca  [ a  = 20.4024(3),  b  = 20.3638(3), and  c  = 13.9522(2) Å,  V  = 5796.7(1) Å 3 ,  Z  = 8]. Crystals of the same compound, obtained in slightly different conditions, had already been investigated by X-ray diffraction and found to have  P 2 1 / n  space group, [ a  = 12.155(4),  b  = 7.933(2), and  c  = 14.522(2) Å,  β  = 93.74(2)°,  V  = 1397.3(6) Å3,  Z  = 4]. Comparison of the two polymorphous forms reveals huge differences in the crystal packing and the important role of the stacking interactions between phenanthroline ligands.

A new case of polymorphism in platinum(II) complexes: [PtBr 2 (2,9-dimethyl-1,10-phenanthroline)]