Über die Tricyanatomercurate KHg(NCO)3 und RbHg(NCO)3 — Synthesen, Kristallstrukturen und Schwingungsspektren / On the Cyanatomercurates KHg(NCO)3 and RbHg(NCO)3 — Syntheses, Crystal Structures and Vibrational Spectra

Abstract

By mixing aqueous solutions of Hg(CH3COO)2 and KOCN the white precipitate K2Hg3(NCO)8 is formed. When recrystallised from CH3OH colorless crystals of the compound KHg(NCO)3 are obtained. The crystal structure analysis (space group Pnma; α = 1015.2(6) pm, b = 399.3(3) pm, c = 1772.9(9) pm) shows a distorted KCdCl3 arrangement with isolated Hg(NCO)2 molecules, K+ and NCO- ions. The vibrational spectra in the range of 250-3000 cm-1 are discussed. The rubidium compound is isotypous (a = 1019.0(6) pm, b = 411.6(4) pm, c = 1820.5(8) pm).