✦ LIBER ✦

Anamalous phosphorescence spectra of Cr(III) complexes and their theoretical interpretation

✍ Scribed by Hans-Herbert Schmidtke; Patrick E. Hoggard

Publisher: Elsevier Science
Year: 1973
Tongue: English
Weight: 438 KB
Volume: 20
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(73)85234-0

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✦ Synopsis

Phosphorescence

spectra of cis-Na[Cr(IDA)a] and tra,?s-N'ci[Cr!XIIDA)a] xe compared with corresponding ab--. sorption and diffuse reflectance spectra. The observed Stokes shifts are unusual for Cr(lI1) complexes; they are esphined through low symmetry ligand field components which, according to the measured band splittings, give rise to LB parameter values of about 500 cm -' for the traorrs complex. For large asymmetric fields a cross-over of the first excited doublet states is obtained yielding a tetragonal (D4h) 'Eg as lowest emitting state with an electron confiuntion (egbzg) different from the ground state 4 Btg (egbg). The observed Stokes shifts follow from a shift of potential surface minima due to this orbital transition. In a similur way the temperature dependence of the cis spectrum is esplained by different population of two excited doublets,

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