Abstract
Polarized electronic absorption spectra of Co2+ in trigonally compressedoctahedra in brucite-type Co(OH)2 have been measured at 290 and 90 K bymicroscope-spectrometric techniques and analysed in terms of the superpositionmodel (SM) of crystal fields. The resulting SM and interelectronic repulsionparameters are B̄4 = 5260, B̄2 = 4920, Racah B = 825, Racah C = 3550 cm-1 at 290 K andB̄4 = 5320, B̄2 = 3900, Racah B = 830,Racah C = 3500 cm-1 at 90 K (R0 = 2.1115 Å; fixed exponentialand spin-orbit parameters t4 = 5, t2 = 3, ζ = 500 cm-1). Togetherwith a recent SM analysis of Li2Co3(SeO3)4, theB̄krefined for Co(OH)2 further confine the magnitude of the hitherto unknown`correct' SM parameters of Co2+ for future application to structurallyand/or chemically less well defined systems.
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