0000000000775163
AUTHOR
Maria Grazia Lombardi
The azido ligand: a useful tool in designing chain compounds exhibiting alternating ferro- and antiferro-magnetic interactions
A one-pot reaction of NiII 1, CoII 2, FeII 3 and MnII 4 with 2,2A-bipyridine (bipy) and azide in water leads to [M(bipy)(N3)2]n chains where the metal ion is alternatively bridged by double end-on (EO) and end-to-end (EE) azido bridges; theoretical analysis of the variable-temperature magnetic susceptibility data of 1 and 4 reveals the occurrence of intrachain alternating ferro- (through EO) and antiferro-magnetic (through EE) interactions. Julve Olcina, Miguel, Miguel.Julve@uv.es ; Lloret Pastor, Francisco, Francisco.Lloret@uv.es ; Clemente Juan, Juan Modesto, Juan.M.Clemente@uv.es
Crystal structures and magnetic properties of uniform and alternating azido-bridged (2,2′-bipyridyl)copper(II) chains
Abstract Single crystals of four copper(II) complexes of formula [Cu(bipy)(N3)2]n (1,2), [Cu(bipy)2(N3)(ClO4)] (3) and [Cubipy)2(N3)]ClO4 (4) (bipy=2,2′-bipyridine) were obtained from aqueous solutions containing (2,2′-bipyridyl) copper(II) perchlorate and sodium azide, and their crystal structures were determined by X-ray diffraction methods. The structures of compounds 1 and 4 were already known, but the better accuracy of our structural determination of complex 1 led us to reconsider it here. The structures of compounds 1 and 2 are made up of neutral chains of copper(II) ions bridged by two azide groups exhibiting asymmetrical end-on (1) and alternating asymmetrical end-on and end-to-end…
Synthesis, crystal structure and magnetic properties of the first single azido-bridged copper(II) chain [Cu(bpym)(N3)2]n (bpym = 2,2′-bipyrimidine)
Abstract Single crystals of the copper(II) chain of formula [Cu(bpym) (N32]n (bpym = 2,2′-bipyrimidine) were prepared and characterized by X-ray diffraction methods. The structure consists of neutral chains of copper (II) ions bridged by a single azide group exhibiting the asymmetric end-to-end coordination mode. A terminally bound azide ligand and a didentate bpym group complete the square pyramidal geometry of the metal atom. The intrachain copper-copper separation is 5.063(1)A. The magnetic behaviour was investigated in the temperature range 2.0–290 K. The susceptibility curve exhibits a maximum at .9 K showing the occurrence of a weak intrachain antiferromagnetic coupling. Analysis of t…