TY - JOUR
T1 - Irreversible spectral changes of cobalt(II) by moderate heating in sol-gel glasses, and their ligand field rationalization
AU - Reisfeld, R.
AU - Chernyak, V.
AU - Eyal, M.
AU - Jørgensen, C. K.
PY - 1989/12/8
Y1 - 1989/12/8
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0001086178&partnerID=8YFLogxK
U2 - 10.1016/0009-2614(89)85034-1
DO - 10.1016/0009-2614(89)85034-1
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AN - SCOPUS:0001086178
SN - 0009-2614
VL - 164
SP - 307
EP - 312
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 2-3
ER -