14099-33-3Relevant articles and documents
Palladiu(II,IV) Mixed-valence Complexes of 1,2-Diaminoethane, 1,3-Diaminopropane, and Diethylenetriamine: Syntheses, Electronic, Infrared, Raman, and Resonance Raman Spectra and X-Ray Studies
Clark, Robin J. H.,Croud, Vincent B.,Kurmoo, Mohamedally
, p. 815 - 820 (1985)
The syntheses of the neutral, linear-chain mixed-valence complexes 2>4>, 2>4>, 2>4>, and a mixed-valence complex of empirical formula Pd2(en)2Br3Cl3, where en=1,2-diaminoethane and tn=1,3-diaminopropane, are reported, together with their electronic, infrared, Raman, and resonance Raman spectra.In addition, the synthesis and spectroscopic properties of the first palladium complex of the +1 charge type, 3>Br2, where dien=diethylenetriamine, is reported.The electronic spectra of the complexes are characterised by intense, broad intervalence bands which decrease in wavenumber in the order Cl > Br.The resonance Raman spectra show overtone progressions (v1ν1) in the axial X-PdIV-X symmetric stretching mode (ν1), which lies at ca. 260 cm-1 for X=Cl and at ca. 145 cm-1 for X=Br, and combination tones v1ν1 + νn, where νn is the ν(Pd-X) equatorial stretching mode, or ν2, νasym(X-PdIV-X), the antisymmetric chain-stretching mode.The excitation profiles of the ν1 and 2ν1 bands of the neutral chain complexes do not reach maxima even with excitation of the lowest available wavenumber (12510 cm-1).These complexes appear to be more delocalised than those of the +2 charge type.Powder diffraction data indicate that Pd2(en)2Br3Cl3 and 2>4> are isostructural and belong to space group Ama2.
