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Models for Cytochromes c′ : Observation of an Extremely Labile Spin State in Monoimidazole Complexes of Saddle‐Shaped Iron(III) Porphyrinates
Author(s) -
Ikezaki Akira,
Takahashi Masashi,
Nakamura Mikio
Publication year - 2009
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200902224
Subject(s) - saddle , spin (aerodynamics) , imidazole , state (computer science) , spin states , saddle point , chemistry , crystallography , stereochemistry , physics , thermodynamics , mathematics , inorganic chemistry , algorithm , mathematical optimization , geometry
Saddle in a spin : The saddle‐shaped octaethyltetraphenylporphyrin–imidazole complex [Fe III (oetpp)(HIm)] + adopts an essentially pure intermediate‐spin state between 298 and 173 K in CD 2 Cl 2 solution, the conditions under which the NMR spectra are recorded. This complex has shown, however, a novel spin transition from S =3/2 to S =5/2 and S =1/2 below 70 K. Thus, the complex exists as an equilibrium mixture of three spin isomers at 4 K.