L. Hiltunen, J. Hölsä, W. Stręk
Dec 15, 1990
Citations
0
Influential Citations
6
Citations
Journal
Inorganica Chimica Acta
Abstract
Abstract The crystal structure of potassium tetrathiocyanatoplatinate(II), K 2 Pt(SCN) 4 , was refined from single crystal X-ray diffraction data to R value of 0.05. K 2 Pt(SCN) 4 crystallizes in the monoclinic space group P 2 1 / c ( Z = 2) with the following cell dimensions: a = 4.294(4), b = 12.869(8), c = 11.055(8) A, and β = 98.00(6)°. The crystal structure consists of layers of planar [Pt(SCN) 4 ] 2− complex anions parallel to the ac plane. Layers are linked by K + ions into a three dimensional network through NKS bonds. A very weak Pt-S-Pt interaction along the a axis results in [Pt(SCN) 6 ] 4− groups with strong tetragonal distortion. The nearly linear SCN − chains have a bent coordination to Pt through sulfur atoms. K + ions are coordinated to three sulfur and five nitrogen atoms in a strongly distorted bicapped trigonal prism arrangement. Both in air and in inert (argon) atmosphere K 2 Pt(SCN) 4 is stable up to 200 °C above which it decomposes through complex reactions involving several intermediate phases. The main phases formed are sulfates and oxides in air and sulfides in argon.