Crystal and molecular structure of the yellow form of chloro (2,2':6',2''-terpyridine) platinum (II) chloride dihydrate, [Pt(terpy)Cl]$Cl.2H_2O$

Abstract

The synthesis, characterization, and X-ray crystal structure of the yellow dimorph, [Pt(terpy)Cl]$Cl.2H_2O$, are reported. The yellow acicular crystals are monoclinic: space group $P2_1/n$, a = 6.908(3) Â, b = 17.06700(11) Â, c = 13. 8390(10) Â, $beta$ = 98.607(4)°, and $D_{calc}$ =2.204 Mg $m^{-3}$ for Z = 4. The cation consists of platinum coordinated to tridentate terpyridine ligand and to chloride ion. The coordination geometry is essentially square-planar with distortions arising from the constraints of the terpyridine ligand. Bond distances are within the acceptable limits of predicted values. The cations stack in a head-to-tail orientation with an intermolecular Pt-Pt distance of 3.39 Â