Irreversible spectral changes of cobalt(II) by moderate heating in sol-gel glasses, and their ligand field rationalization

R. Reisfeld*, V. Chernyak, M. Eyal, C. K. Jørgensen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Cobalt(II) nitrate or acetate added to a precursor methanolic solution of TMOS (silicon tetrakis-methoxide), which hydrolyzes and polycondensates when heated above 300°C, forms blue films showing three strong bands at 15600, 16800 and 19000 cm-1 (like a known complex with two acetone and two chloro ligands). The absorption spectra even of tetrahalides and crystalline oxides (e.g. spinel-type) do not agree closely with regular tetrahedral coordination, and angular overlap estimates suggest D2h holohedrized symmetry in the glass. Inner shell 3p mixing with 3d may provide intensities not feasible in octahedral complexes.

Original languageEnglish
Pages (from-to)307-312
Number of pages6
JournalChemical Physics Letters
Volume164
Issue number2-3
DOIs
StatePublished - 8 Dec 1989

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