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Saddle‐Shaped Six‐Coordinate Iron( III ) Porphyrin Complexes Showing a Novel Spin Crossover between S =1/2 and S =3/2 Spin States
Author(s) -
Ikeue Takahisa,
Ohgo Yoshiki,
Yamaguchi Tatsuya,
Takahashi Masashi,
Takeda Masuo,
Nakamura Mikio
Publication year - 2001
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 - 10.1002/1521-3773(20010716)40:14<2617::aid-anie2617>3.0.co;2-b
Subject(s) - porphyrin , spin crossover , chemistry , pyridine , spin states , imidazole , spin (aerodynamics) , crystallography , stereochemistry , photochemistry , medicinal chemistry , inorganic chemistry , physics , thermodynamics
The field strength of the axial ligands determines the spin state of saddled iron( III ) porphyrin complexes (see picture). Strong axial ligands (L), such as imidazole and 4‐dimethylaminopyridine, lead to the formation of complexes with a pure S =1/2 state, while weak ligands, such as THF, give complexes with a pure S =3/2 state. Intermediate strength ligands, such as pyridine and 4‐cyanopyridine, give complexes that show a novel spin crossover between the S =1/2 and S =3/2 states.