Abstract
Surface chromium (II) on silica is coordinated by two ≥SiO groups in cis position. Adsorption of ammonia and amines leads to stable (≥SiO)2CrL2 and further to unstable (≥SiO)2CrL4; reflection spectra suggest pseudo square planar and pseudo octahedral structures respectively for these complexes. Formation of the six-coordinate species depends on the type of the amine.
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