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A far-infrared study and investigation of the difference between the asymmetric and symmetric POO− stretching frequencies in metal diphosphonate complexes by Albert W. Herlinger; John R. Ferraro; Julie A. Garcia; Renato Chiarizia is a Chemistry article available to read on EtoBox.

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Abstraet--Lanthanide complexes of P,P'-di(2-ethylhexyl) methanediphosphonic acid, HzDEH [MDP], were prepared and investigated by infrared spectroscopy. Qualitative information about the nature of the phosphonate binding in the complexes was obtained by measuring the asymmetric and symmetric POO-stretching frequencies of the ligand. These vibrational modes appear at lower energy in the complexes than in the sodium salt. This indicates symmetrical coordination of the phosphonate groups through chelate and/or bridging interactions. The frequency difference between the POO-stretching bands Av becomes smaller as the ionic potential e/r of the metal ion increases. The correlation is valid when both oxygen atoms are involved in the bonding and no other absorption bands interfere with the POO-vibrations. The origin of this empirical correlation is the change in the P--O bond order which arises from a change in the strength of the metaldiphosphonate interaction. The far-infrared spectra of the lanthanide complexes, an 54Fe-labelled compound, and the sodium salt of H2DEH[MDP] were measured to provide insight into the nature of the metal-ligand interaction. The appearance of metal-oxygen stre

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Author

Albert W. Herlinger; John R. Ferraro; Julie A. Garcia; Renato Chiarizia

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0277-5387)

Published

1998

Language

EN

Field

Chemistry (Physical Sciences)