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Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyl(tropone)iron
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A new pentanuclear cyano-bridged complex [(Fe(II)(tetraazamacrocycle))3{mu-NC-FeIII(CN)5)2]: synthesis, spectroscopic

Fabiana H O Ishiruji1, David J Evans, Flávio L Benedito

  • 1Departamento de Química, Universidade Federal do Paraná, Centro Politécnico, C.P. 19081, 81531-990, Curitiba, PR, Brazil.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|March 18, 2008
PubMed

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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