Pressure-tuning infrared spectra of the three Magnus' Green salts, [Pt(NH3)4][PtCl4], [Pt(ND3)4][PtCl4] and [Pt(NH3)4][PtBr4]

Pressure-tuning infrared spectra (up to ca. 40 kbar) are reported for Magnus' Green salt, [Pt(NH3)(4)][PtCl4] and two of its derivatives, [Pt(ND3)(4)][PtCl4] and [Pt(NH3)(4)][PtBr4]. The spectroscopic data indicate that there is restricted rotation of the coordinated ammonia groups about the Pt-N bonds in the complexes. It is possible that this restricted rotation is due to the presence of weak hydrogen bonding to the halogens, i.e., N-H center dot center dot center dot X (X = Cl, Br) interactions. (C) 2011 Elsevier B. V. All rights reserved.