TY - JOUR
T1 - Synthesis, structure and magnetic properties of an asymmetric dinuclear oxocitratovanadate(IV) complex
AU - Burojevic, Suzana
AU - Shweky, Itzhak
AU - Bino, Avi
AU - Summers, David A.
AU - Thompson, Robert C.
PY - 1996/10/1
Y1 - 1996/10/1
N2 - Evaporation of an aqueous solution containing VO2+, citric acid and neocuproine (2,9-dimethyl-1,10-phenanthroline = neo) produces blue crystals of (Hneo)3[(VO)2(cit)(Hcit)]·4H2O (1). An X-ray structural analysis showed that 1 consists of a discrete, asymmetric, dinuclear oxocitratovanadate(IV) complex and three neocuproinium cations. The complex contains one six-coordinate V(IV) atom with a distorted octahedral geometry and one five-coordinate V(IV) atom with a distorted square pyramidal geometry. The two metal atoms are bridged by two alkoxide oxygen atoms of one cit4- group and one Hcit3- group which has one protonated, non-coordinating carboxylic group. The V⋯V distance was found to be 2.949(1) Å. Compound 1 is orthorhombic, space group Pca21, with a = 22.223(3), b = 10.499(1), c = 22.818(2) Å, V = 5324(1) Å3 and Z = 4. Magnetic susceptibility measurements of a powdered sample of 1 over the range 2-300 K showed a very strong antiferromagnetic coupling between the two d1 systems with -J value of 212 cm-1.
AB - Evaporation of an aqueous solution containing VO2+, citric acid and neocuproine (2,9-dimethyl-1,10-phenanthroline = neo) produces blue crystals of (Hneo)3[(VO)2(cit)(Hcit)]·4H2O (1). An X-ray structural analysis showed that 1 consists of a discrete, asymmetric, dinuclear oxocitratovanadate(IV) complex and three neocuproinium cations. The complex contains one six-coordinate V(IV) atom with a distorted octahedral geometry and one five-coordinate V(IV) atom with a distorted square pyramidal geometry. The two metal atoms are bridged by two alkoxide oxygen atoms of one cit4- group and one Hcit3- group which has one protonated, non-coordinating carboxylic group. The V⋯V distance was found to be 2.949(1) Å. Compound 1 is orthorhombic, space group Pca21, with a = 22.223(3), b = 10.499(1), c = 22.818(2) Å, V = 5324(1) Å3 and Z = 4. Magnetic susceptibility measurements of a powdered sample of 1 over the range 2-300 K showed a very strong antiferromagnetic coupling between the two d1 systems with -J value of 212 cm-1.
KW - Asymmetric complexes
KW - Citrate complexes
KW - Crystal structures
KW - Dinuclear complexes
KW - Vanadyl complexes
UR - http://www.scopus.com/inward/record.url?scp=0001852163&partnerID=8YFLogxK
U2 - 10.1016/s0020-1693(96)05254-1
DO - 10.1016/s0020-1693(96)05254-1
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AN - SCOPUS:0001852163
SN - 0020-1693
VL - 251
SP - 75
EP - 79
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
IS - 1-2 PART II
ER -