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|Title:||Single-crystal optical spectral studies of tetrabutylammonium bis(maleonitriledithiolato)nickelate(II)|
|Citation:||Inorganic Chemistry, 25(26), 4680-4686|
|Abstract:||A detailed optical spectral study of [(n-Bu) 4N] 2[Ni(mnt) 2] carried out in solution and single-crystal media is reported. Polarized optical spectral measurements at 298 K and temperature-dependent spectral measurements with unpolarized light in the range 18-298 K have been carried out. Using the 12 transitions observed in single crystals, we could deconvolute the solution spectrum of this complex to locate all of them. The polarization and allowedness of all the bands have been determined. Vibronic progressions have been resolved on some of the bands at 50 K, where maximum resolution occurred. An unusual temperature dependence of spectral intensities has been observed above and below 50 K and is attributed to changes in the lattice. All the d ? d transitions have been identified unlike in the earlier works and the assignments based on the energy level scheme proposed in this work are compared with those of earlier reports. Energy level schemes proposed earlier by WHMO, simple MO, and discrete variational Xa calculations and EPR results have been comprehensively compared with the present spectral data of crystals. ? 1986 American Chemical Society.|
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