YERSIN, H and HUBER, P and GIETL, G and TRUMBACH, D (1992) PRESSURE-INDUCED TUNING OF FLUORESCENCE TO PHOSPHORESCENCE IN [CR(UREA-H4)6](CLO4)3 AND [CR(UREA-D4)6](CLO4)3. CHEMICAL PHYSICS LETTERS, 199 (1-2). pp. 1-9. ISSN 0009-2614,
Full text not available from this repository.Abstract
In [Cr(urea-h4)6](ClO4)3 the lowest sublevel of 4T2g(t2g2e(g)1) lies DELTAE=90+/-10 cm-1 above the lower 2E(g)(t2g3) sublevel. At 1.3 K one observes a fine-structured phosphorescence. With temperature increase, for example to 120 K, the quartet is thermally occupied and one obtains a broad-band fluorescence. Pressure application at the same temperature results in a blue-shift of 4T2g relative to 2E(g). This reduces the thermal repopulation of the quartet. Thus it is possible to induce a fine-structured phosphorescence by pressure. The emission intensity of the origin (s) corresponding to 2E(g) increases by a factor of about 10(2) with pressure application up to 20 kbar. [Cr(urea-d4)6](ClO4)3 exhibits somewhat different properties. DELTAE is larger (140+/-10 cm-1) and the observed effects are less distinct. The origin lines corresponding to 2E(g) exhibit linear shifts of DELTAnuBAR/DELTAp=-(5.5+/-0.5) cm-1/kbar (protonated compound) and DELTAnuBAR/DELTAp=-(5.3+/-0.5) cm-1/kbar (deuterated compound). Vibrational frequencies, determined from vibronic satellites and IR spectra, are given for both compounds. Most vibronic satellites in the phosphorescence spectra are blue-shifted with pressure relative to the origins.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CHROMIUM PHOTOLUMINESCENCE; LUMINESCENCE; DEPENDENCE; EMISSION; LINE; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:44 |
| URI: | https://pred.uni-regensburg.de/id/eprint/54329 |
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