MÖSSBAUER CHARACTERIZATION OF IRON (II)-IRON (III) METALLORGANIC COMPOUNDS WITH POLYMERICLIGAND (P4VP)

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Submitted on 1 Jan 1976

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MÖSSBAUER CHARACTERIZATION OF IRON

(II)-IRON (III) METALLORGANIC COMPOUNDS

WITH POLYMERICLIGAND (P4VP)

N. Burriesci, M. Petrera, G. Parravano

To cite this version:

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JOURNAL DE PHYSIQUE Colloque C6, supplkment au no 12, Tome 37, Dtcembre 1976, page C6-472

MOSSBAUER

CHARACTERIZATION OF IRON (11)-IRON

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METALLORGANIC COMPOUNDS WITH POLYMERICLIGAND (P4VP)

N. BURRIESCC M. PETRERA

Institute Ricerche. (( G. Domegani >>

Montedison, 1-28100 Novara, Italy and

G. PARRAVANO

Department of Chemical Engineering University of Michigan Ann Arbor, Mich. 48109, U. S. A.

Rbum6.

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Les spectres Mossbauer de Fe(II1)-P4VP, Fe(I1)-P4VP, et Fe(C0)4-Py ont Btk obtenus a la temperature ambiante. Les spectres a 4 raies correspondent

a

l'existence de deux types de fer. Le dkplacement isomerique et l'effet quadrupolaire indiquent la prbence simultanke d'6tats haut-spin et bas-spin pour les composBs P4VP. Les composBs Fe(II1) sont un melange d'ktats Bectroniques 6A1 (S = 512) et 2T2 (S = 1/2), alors que dans Ies compos6s Fe(I1) on trouve les Btats lA1 (S = 0) et ST2 (S = 2). A la tempkrature ambiante 1'6quilibre se deplace vers les Btats haut-spin. La structure typique du complexe pyridinique semble Stre une pyramide trigonale.

Abstract. - Mossbauer spectra of Fe(II1)-P4VP, Fe(I1)-P4VP and Fe(C0)4-Py were measured at room temperature. The complexes show a Cline spectrum corresponding to two different iron forms. The isomershift and quadrupole splitting values point out the presence of both high and low spin iron for P4VP compounds. The Fe(II1) compounds are a mixture of 6A1 (S = 512) and 2T2 (S = 112) iron electronic states, while in the Fe(I1) compounds states 1Al (S = 0) and 5T2

(S = 2) are present. At room temperature the equilibria are shifted towards higher spin states. A trigonal bipyramid seems to be the typical structure of the pyridinic complex.