The infrared spectrum and force field of the methyl-ammonium ion in (CH3NH3)2PtCl6
1977; Elsevier BV; Volume: 38; Linguagem: Inglês
10.1016/0022-2860(77)87075-0
ISSN1872-8014
AutoresIan A. Oxton, Osvald Knop, Jo Duncan,
Tópico(s)Molecular Spectroscopy and Structure
ResumoInfrared spectra of the CH3NH3+, CH3ND3+, CD3NH3+ and CD3ND3+ ions in bis(methylammonium)hexachloroplatinate(IV) have been recorded. The spectra are entirely consistent with the C3v symmetry reported for the methylammonium ion, at temperatures between room temperature and 90 K. No spectral manifestations of the phase transition, which in (CH3NH3)2PtCl6 has been reported to take place at 125 K, were observed. Assignments of the infrared-active fundamentals have been made for each ion and a normal-coordinate analysis has been performed using the observed fundamental frequencies. Comparison with the infrared spectra of other methylammonium salts shows that hydrogen bonding in (CH3NH3)2PtCl6, if present, is weak.
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