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Conformações distorcida e planar do anel porfirínico em complexos e hemoproteínas: propriedades físico-químicas e implicações espectroscópicas

Author(s): Moreira Leonardo M. | Ribelatto Julio C. | Imasato Hidetake

Journal: Química Nova
ISSN 0100-4042

Volume: 27;
Issue: 6;
Start page: 958;
Date: 2004;
Original page

Keywords: porphyrin | electronic configurations | spectroscopies

The different conformations of porphyrin rings are strongly related with the electronic configurations of the metallic center in the ferriheme coordination compounds and heme proteins. The usual electronic configuration, (d xy)²(d xz,d yz )³ presents a planar conformation of the porphyrin ring and the less common electronic configuration (d xz,d yz)4(d xy )¹ occurs in the case of a strongly ruffled ring. These states are responsible for distinct chemical and spectroscopic properties of the porphyrin systems. The importance of the ring conformations, their characteristics, implications and applications are discussed.
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