Low-temperature vibrational spectra of cis-dichloro-( meso-2,3-diaminobutane)palladium(II) and platinum(II)

Abstract

IR and Raman spectra of MCl 2( meso-2,3-diaminobutane), (M = Pd, Pt), have been recorded down to liquid nitrogen temperature or lower. It is shown that correlation coupling occurs between closely spaced hydrogen-bonded pairs of molecules, which form a “super molecule,” but not between all eight molecules in the unit cell. The lattice mode region is also understood in outline on the basis of motions of the “super molecules” Methyl torsional modes appear to be near 140 cm −1.