PRESSURE-INDUCED CHANGE OFd-dLUMINESCENCE ENERGIES, VIBRONIC STRUCTURE AND BAND INTENSITIES IN TRANSITION METAL COMPLEXES

Spin-flip luminescence

“…Interestingly, for Cr4[BF 4 ] 3 much larger shifts of -14.8 and -9.5 cm -1 kbar -1 were found for the low-and high-energy emission, respectively, in aqueous solution, in methanol and in the solid state. The large barochromic effect is explained by subtle changes in the coordination geometry of the complex induced by high pressures [72,112].…”

Metal centered ligand field excited states: Their roles in the design and performance of transition metal based photochemical molecular devices

“…For additional theoretical and spectroscopic treatment regarding some of these questions, the reader is directed to several reviews: ligand field theory (LFT) description of the relationship between electronic structure and M-L bond length [32,33]; the correlation of computational methods such as density functional theory (DFT) with experimental results [34,35]; the elucidation of details of electronic structure through the technique of spectral hole-burning [36]; spectroscopic methods to study coupled electronic states [32,37]; the effect of pressure on luminescence spectra [38,39]; low temperature luminescence spectra with resolved vibronic structure [40].…”

Variation of M···H–C Interactions in Square-Planar Complexes of Nickel(II), Palladium(II), and Platinum(II) Probed by Luminescence Spectroscopy and X-ray Diffraction at Variable Pressure

“…A renewed focus on the luminescence and photochemical properties of 3d complexes is emerging in the recent literature. − Many past studies are aimed at intensely luminescent complexes of 4d and 5d metals with d 6 , d 8 , or d 10 electron configurations, documented in several comprehensive reviews. − Very few studies systematically compare the luminescence properties of 3d, 4d, and 5d metal complexes with identical ligands. Variable-pressure studies provide quantitative, continuously varied spectroscopic properties of crystalline complexes − and are especially attractive to probe structure–energy relationships. − Only rarely have such continuous variations been explored by any spectroscopic technique for isoelectronic complexes with different metal centers. In this report, we compare variable-pressure luminescence spectra of structurally similar d 8 complexes with identical ligands but different metal centers to quantify luminescence energy variations.…”