Study of the [CaM(C3H2O4)(2)(H2O)(4)]center dot nH(2)O [M = Mn, Fe or Co (n=0) and Ni (n=2)] systems: synthesis, structure, spectroscopic and magnetic properties
Ig. De Muro et al., Study of the [CaM(C3H2O4)(2)(H2O)(4)]center dot nH(2)O [M = Mn, Fe or Co (n=0) and Ni (n=2)] systems: synthesis, structure, spectroscopic and magnetic properties, J CHEM S DA, (19), 2000, pp. 3360-3364
Citations number
25
Categorie Soggetti
Inorganic & Nuclear Chemistry
Journal title
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
The [CaM(mal)(2)(H2O)(4)] (M = Mn, Fe or Co; mal = C3H2O4) and [CaNi(mal)(2
)(H2O)(4)]. 2H(2)O compounds have been synthesized and characterized. X-Ray
single crystal diffraction analysis was carried out on the [CaMn(C3H2O4)(2
)(H2O)(4)] and [CaNi(C3H2O4)(2)(H2O)(4)]. 2H(2)O complexes. The [CaM(C3H2O4
)(2)(H2O)(4)] (M = Fe or Co) compounds are considered to be isostructural t
o the former one. The structures consist of three-dimensional networks of m
etal ions co-ordinated by malonate ligand acting as bridges. The transition
metal and calcium ions exhibit octahedral and eight-co-ordination, respect
ively. Thermogravimetric studies confirm the presence of both co-ordinated
and hydrated water molecules. Spectroscopic measurements show high spin oct
ahedral symmetries for the transition metal ions. Magnetic measurements rev
eal the presence of weak antiferromagnetic interactions in all compounds.