Spin crossover in a supramolecular feii-feiii system

• Autorzy: Ohta H. , Sunatsuki Y. , Ikuta Y. , Matsumoto N. , Lijima S. , Akashi H. , Kambe T. , Kojima M.
• Języki publikacji: EN

Abstrakty

EN

The structure of [FeII(H3L)](ClO4)2ˇ3H2O, where H3L is a tripodal hexadentate ligand derived from the 1:3 condensation of tris(2-aminoethyl)amine and 4-formylimidazole, has been determined by X-ray crystallography at 113 and 293°K. A spin transition was indicated from the Fe-N bond distances. The temperature dependence of the magnetic susceptibility revealed that the complex undergoes a gradual spin transition in the temperature range 150-270°K. A mixed-valence complex, [FeII(H3L)][FeIII(L)](BF4)2 1.5H2O, was prepared by the controlled deprotonation of the protonated species, [FeII(H3L)](BF4)2ˇ1.5H2O, under aerobic conditions, and the X-ray structure was determined at 293°K. Two species, [FeII(H3L)]2+ and [FeIII(L)], are linked by imidazole-imidazolate (NH-N) hydrogen bonds to form a puckered sheet structure. Magnetic susceptibility measurements and Mössbauer spectra provided evidence of spin-crossover at both the FeII and FeIII sites. There are three accessible electronic states: (LS FeII-LS FeIII), (HS FeII-LS FeIII), and (HS FeII-HS FeIII) that occur in passing from lower to higher temperatures.

Słowa kluczowe

EN

spin crossover; hydrogen bonds; tripodal ligand

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Materials Science
• Rocznik: 2003
• Tom: Vol. 21, No. 2
• Strony: 191--198
• Opis fizyczny: Bibliogr. 13 poz.,

Twórcy

autor

Ohta H.

• Department of Chemistry, Faculty of Science, Okayama University,Tsushima, Japan

autor

Sunatsuki Y.

• Department of Chemistry, Faculty of Science, Okayama University,Tsushima, Japan

autor

Ikuta Y.

• Department of Chemistry, Faculty of Science, Kumamoto University, Kumamoto 860-8555, Japan

autor

Matsumoto N.

• Department of Chemistry, Faculty of Science, Kumamoto University, Kumamoto 860-8555, Japan

autor

Lijima S.

• National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8566, Japan

autor

Akashi H.

• Research Institute of Natural Sciences, Okayama University of Science, Ridaicho, Okayama 700-0005, Japan

autor

Kambe T.

• Department of Physics, Faculty of Science, Okayama University, Tsushima, Okayama 700-8530, Japan

autor

Kojima M.

• Department of Chemistry, Faculty of Science, Okayama University, Tsushima, Okayama 700-8530, Japan

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