ISSN:
0044-2313
Keywords:
iron(III) porphyrin
;
binuclear iron(III) complex
;
antiferromagnetic exchange coupling
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Intramolekularer Antiferromagnetismus in μ-Oxo-bis[(5,15-dimethyl-2,3,7,8,12,13,17,18-octaethylporphyrinato)eisen(III)]μ-Oxo-bis[(5,15-dimethyl-2,3,7,8,12,13,17,18-octaethylporphyrinato)eisen(III)] mit der Brückengeometrie d(Fe—O) = 1,752 Å und ∢(Fe—O—Fe) = 178,6° zeigt nach Analyse der magnetischen Suszeptibilität zwischen 6 K-295 K (Heisenberg-Modell: Ĥ = -2JŜ1 · Ŝ2; S1 = S2 = 5/2) antiferromagnetische Spin-Spin-Kopplung innerhalb der dinuklearen Fe(III)-3d5-Einheit mit J = -125 cm-1. Der J-Wert ordnet sich in bezug auf den Fe—O-Abstand in die Reihe bekannter μ-Oxodieisen(III)-Porphyrine und -Porphycene ein. Gegenüber der Spin-Spin-Kopplung in [Fe2Cl6O]2- ist |J| um ≈10% erhöht.
Notes:
The magnetism of μ-oxo-bis[(5,15-dimethyl-2,3,7,8,12,13,17,18-octaethylporphyrinato)iron(III)] with bridge geometry d(Fe—O) = 1.752 Å and ∢(Fe—O—Fe) = 178.6° can be explained in terms of antiferromagnetically exchange coupled iron(III)-3d5 pairs. The magnetochemical analysis in the temperature range 6K-295K on the basis of the isotropic Heisenberg model (spin Hamiltonian: Ĥ = -2JŜ1 · Ŝ2 S1 = S2 = 5/2) leads to the exchange parameter J = -125 cm-1. With regard to the Fe—O bond length the J value corresponds to the series of data observed for other μ-oxodiiron-porphyrins and -porphycenes. Compared to the spin-spin coupling in [Fe2Cl6O]2-, |J| is enhanced by ≈ 10%.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19966220114
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