PRESSURE-INDUCED CHANGE OF d-d LUMINESCENCE ENERGIES, VIBRONIC STRUCTURE AND BAND INTENSITIES IN TRANSITION METAL COMPLEXES

ABSTRACT

The effects of hydrostatic pressure on the luminescence spectra of tetragonal transition metal complexes with nondegenerate electronic ground states are analyzed quantitatively by means of models based on potential energy surfaces defined along normal coordinates. Pressure-induced changes of intensity distributions within vibronic progressions, band maxima, electronic origins and relaxation rates are discussed for metal-oxo complexes of rhenium(V) and molybdenum(IV) (d² electron configuration) and for square-planar complexes of palladium(II) and platinum(II) (d⁸ electron configuration).

Keywords:

• Luminescence spectroscopy
• d-d transitions
• pressure
• metal-oxo complexes
• square-planar complexes
• molybdenum(IV)
• palladium(II)
• platinum(II)
• rhenium(V)

ACKNOWLEDGMENT

Financial support from the Natural Science and Engineering Research Council (Canada) is gratefully acknowledged. We thank Professor Ian S. Butler (McGill University, Montreal, Canada) for encouraging us to measure pressure-dependent spectra, for many helpful discussions and for the loan of a diamond anvil cell for early measurements.

Notes

^a Ref.[49]

^b Ref.[48]

^c Ref.[50]

^d Ref.[51]

^e Estimated from the spectra in Fig. 5.