Vibrational spectra of alkali and alkaline earth metal complexes, oxide glasses and oxyanion salts

Rao, C. N. R. ; Randhawa, H. S. ; Reddy, N. V. R. ; Chakravorty, D. (1975) Vibrational spectra of alkali and alkaline earth metal complexes, oxide glasses and oxyanion salts Spectrochimica Acta Part A: Molecular Spectroscopy, 31 (9-10). pp. 1283-1291. ISSN 0584-8539

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/058485...

Related URL: http://dx.doi.org/10.1016/0584-8539(75)80185-1

Abstract

Infrared and Raman Spectra of Li+, Na+, K+ and Mg2+ complexes of amides have been studied and assignments made of low frequency bands characteristic of metal-oxygen polyhedra (in the case of Li+, asymmetric stretching is around 400 cm-1). Infrared spectra of pyridine and CH3CN complexes with characteristic M---N bands are reported. Analysis of the spectra of linear O---M+---O (M = H, D or Li) systems in sparteine-N16-oxide sesquiperchlorate has established the D∞h symmetry of the group with the characteristic O---Li+---O asymmetric stretching mode around 400 cm-1. Crown ether complexes of Li+ show characteristic LiO4 bands around 400 cm-1. Crystalline oxides of Li with well-defined LiO4 tetrahedra also exhibit the 400 cm-1 band due to Li---O stretching. Oxide glasses show low frequency bands characteristic of the metal-oxygen polyhedra. These bands are shown to be useful in determining the nature of cation coordination in a variety of systems.

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