ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The effect of pressure has been measured on the absorption spectra of (n-Bu4N)2Re2X8 (X=Cl, Br, I), K4Mo2Cl8, (NH4)4Mo2Br8, and Re2[CCO2 (CH3)3]2X8(X'=Cl, Br). For the rhenium and molybdenum halides in the solid state a distinct shift to lower energy (red shift) was observed for the δ→δ* excitation. In solution the shift of the δ→δ* was red in CH2Cl2 but exhibited a complex behavior in the associated solvents CH3CN and CH3NO2 which we attributed to solvation of the ion. The dipivalate molecules in CH3CN exhibited a red shift as one might expect as they are less solvated. The π→π* excitations in the rhenium bromide and iodide showed a blue shift which increased with pressure. We discuss the observed shifts in terms of the relative importance of intra and intermolecular interactions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.451410
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