The magnetic properties of Cu(Ac-α-ala)2·H2O, Cu(Bz-α-ala)2·H2O and Cu(Bz-β-ala)2 (Ac-α-ala = N-acetyl-DL-alaninate, Bz-α-ala = N-benzoyl-DL-alaninate, Bz-β-ala = N-benzoyl-β-alaninate ion) have been investigated by means of variable-temperature magnetic and ESR measurements. The magnetic behaviour of the compounds suggests binuclear structures with exchange integrals typical of copper acetate monohydrate-like complexes. Low-temperature ESR spectra of the powdered samples show triplet absorptions characteristic of axially symmetric (Cu(Ac-α-ala)2·H2O and Cu(Bz-α-ala2·H2O) or rhombically distorted (Cu(Bz-β-ala)2) copper(II) carboxylate dimers. A polymeric structure is proposed for Cu(Bz-β-ala)2 due to the detection of interdimer exchange between triplet states.
Magnetic investigations on some copper(II) N-acetyl- and N-benzoyl-alaninates / F., Cariati; L., Erre; G., Micera; Menabue, Ledi; Saladini, Monica; P., Prampolini. - In: INORGANICA CHIMICA ACTA. - ISSN 0020-1693. - STAMPA. - 53:(1982), pp. 85-89. [10.1016/S0020-1693(00)81896-4]
Magnetic investigations on some copper(II) N-acetyl- and N-benzoyl-alaninates.
MENABUE, Ledi;SALADINI, Monica;
1982
Abstract
The magnetic properties of Cu(Ac-α-ala)2·H2O, Cu(Bz-α-ala)2·H2O and Cu(Bz-β-ala)2 (Ac-α-ala = N-acetyl-DL-alaninate, Bz-α-ala = N-benzoyl-DL-alaninate, Bz-β-ala = N-benzoyl-β-alaninate ion) have been investigated by means of variable-temperature magnetic and ESR measurements. The magnetic behaviour of the compounds suggests binuclear structures with exchange integrals typical of copper acetate monohydrate-like complexes. Low-temperature ESR spectra of the powdered samples show triplet absorptions characteristic of axially symmetric (Cu(Ac-α-ala)2·H2O and Cu(Bz-α-ala2·H2O) or rhombically distorted (Cu(Bz-β-ala)2) copper(II) carboxylate dimers. A polymeric structure is proposed for Cu(Bz-β-ala)2 due to the detection of interdimer exchange between triplet states.
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