A new polymorph of dichlorido(1,10-phenanthroline)platinum(II)

A yet unreported polymorph of [PtCl2(1,10-phenanthroline)] was obtained by slow decomposition, in CH2Cl2 solution, of [Pt{CH2CH2N(CH2CH3)2-κC,κN}(1,10-phenanthroline)](ClO4). The structure of the new orthorhombic form, III, (space group Pna21), is described and compared to those of the two already reported forms, I and II, which are monoclinic (space group P21/c) and orthorhombic (space group Pca21), respectively [21]. Polymorph III appears to be the least stable of the three.