Magnetism of Co(C3H4N2)2(CO3)(H2O)2

Abstract

We report on a detailed investigation of magnetic susceptibility χ (T, B), magnetization M(T, B) and specific heat Cp(T, B) for a polycrystalline sample of Co(C3H4N2)2(CO3)(H2O)2. Ground state for Co2+ has found to show an unquenched spin–orbit coupling and a weak antiferromagnetic interaction between Co ions. Application of magnetic field significantly affects the magnetization and specific heat at T < 20 K. Anomaly observed in Cp(T, H)‐dependences may be interpreted in terms of the conventional two‐level (doublet–singlet) Schottky model. Both energy gap between these levels and the coefficient of the electronic specific heat are strongly field dependent.

Dielectric properties of Co(CO3)(H2O)2(C3H4N2)2 and [Co(C3H3N2)2]n

“…An unquenched spin-orbit coupling was assumed to be the reason of a larger m eff in Co(CO 3 )(OH 2 ) 2 (ImH) 2 . 6 Considering the fact that the letter complex has also a larger permittivity 3 0 at room temperature one may suggest that the dielectric properties are associated with the Co 2+ orbitals, which in fact are involved in the dipole of Coligands. When we deal with the Cu(Im) 2 and Zn(Im) 2 complexes, we see that the paramagnetic properties of Cu 2+ (ref.…”

“…[2][3][4][5] Some years ago, we focused our interest on magnetic properties of cobalt complexes with imidazole Co(CO 3 )(H 2 O) 2 (C 3 -H 4 N 2 ) 2 (ref. 6) and [Co(C 3 H 3 N 2 ) 2 ] n . 7 The experimental data revealed that the Co 2+ ions in these compounds behave in a different manner.…”

“…Sample preparation procedures and their characterization were described in detail before. 6,7 These samples, henceforth abbreviated as Co(CO 3 )(OH 2 ) 2 (ImH) 2 and Co(Im) 2 , respectively. In this work, we present the results of measurements on two samples of Co(Im) 2 labelled as Nr 1 and Nr 2 and compare the data with that of Co(CO 3 )(H 2 O) 2 (ImH) 2 .…”

Reversible uptake of molecular oxygen by heteroligand Co(II)–l-α-amino acid–imidazole systems: equilibrium models at full mass balance

“…l -α-amino acids: asparagine, pure, Sigma Chemical Co., histidine, pure (≥99.0%), Fluka Chemie GmbH, alanine, pure, International Enzymes Limited; polymeric [Co(imid) 2 ] n complex prepared by A. Vogt, Faculty of Chemistry, University of Wrocław [27, 38, 45]; potassium nitrate (V), p.a., P.O.Ch. Gliwice; nitric (V) acid, p.a., P.O.Ch.…”

“…[Co(imid) 2 ] n is a coordination compound crystallizing in an infinite polymeric net, in which each cobalt(II) ion is joined via imidazole bridges with four adjacent ions of the metal [27, 28]. Each Co(II) ion forms two dative bonds with the nitrogen atoms of two deprotonated imidazole moieties and two ionic bonds with the nitrogen atoms of two other imidazoles (Fig.…”