4f-4f absorption spectra and hypersensitivity in nine-coordinate Ho(III) and Er(III) complexes in different environments

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Azad A KhanK Iftikhar

Abstract

The effect of change in the environment upon 4f-4f absorption spectra of nine-coordinate Ho(III) and Er(III) complexes with thiocyanate and 2,2'-bipyridyl in methanol, DMSO, DMF and pyridine have been investigated. The oscillator strength for hypersensitive and non-hypersensitive transitions have been calculated and variation in the intensity and band shape with respect to solvent type is rationalized in terms of solvent structure and coordinating properties. A comparison with 1,10-phenanthroline complexes is investigated and has been found that phen has a larger impact on the transition intensities for these ions. Pyridine has been found most effective in promoting 4f-4f intensity. The results indicate that it is important to consider both the static and dynamic coupling mechanism while analysing the oscillator strength of hypersensitive transition.

References

Mar 14, 2003·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·H A Hussain, K Iftikhar

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Citations

Nov 6, 2012·Journal of Photochemistry and Photobiology. B, Biology·Sona NiroomandAsieh Moodi

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