Sodium cation is complexed by N,N′-ethylenebis(salicylideniminato)oxovanadium(IV), VO(salen), when a tetrahydrofuran or acetonitrile solution of NaBPh4 is treated with VO(salen), This reaction affords [(VO(salen))2Na]BPh4, as a light green crystalline solid, which contains Na+ trapped in a coordination cage provided by six oxygen atoms. The X-ray analysis performed on [(VO(salen))2Na]BPh4 shows that all the oxygens of VO(salen) are involved in coordination to the sodium cation, giving a cationic polymeric structure. The coordination geometry around Na+ is pseudooctahedral, where the six oxygens are provided by four different VO(salen) units. Vanadium is five-coordinate in an approximate square-pyramidal environment. The vanadium atom is displaced by 0.606 Å above the least-squares plane of the four coordinating atoms of the salen unit, and the mean value of the V=O bond distance is 1.584 (2) Å. Crystallographic details for [(VO-(salen))2Na]BPh4: space group P1 (triclinic), a = 16.053 (4) Å, b = 17.199 (4) Å, c = 11.221 (1) Å, α = 87.01 (2)°, β = 101.01 (2)°, γ = 124.29 (2)°, V = 2506.6 Å3, Z = 2. The final R factor was 4.4% for 3161 observed reflections. It was found that the complexation of potassium cation by the same ligand occurs only in the presence of a catalytic amount of Na+.

NN'Ethylenebis(salicylideneiminato)oxovanadium(IV): A New Ligand Coordinating Sodium Cation in a Chain-Layered Structure. Synthesis and Crystal Structure

PASQUALI, MARCO;MARCHETTI, FABIO;
1980

Abstract

Sodium cation is complexed by N,N′-ethylenebis(salicylideniminato)oxovanadium(IV), VO(salen), when a tetrahydrofuran or acetonitrile solution of NaBPh4 is treated with VO(salen), This reaction affords [(VO(salen))2Na]BPh4, as a light green crystalline solid, which contains Na+ trapped in a coordination cage provided by six oxygen atoms. The X-ray analysis performed on [(VO(salen))2Na]BPh4 shows that all the oxygens of VO(salen) are involved in coordination to the sodium cation, giving a cationic polymeric structure. The coordination geometry around Na+ is pseudooctahedral, where the six oxygens are provided by four different VO(salen) units. Vanadium is five-coordinate in an approximate square-pyramidal environment. The vanadium atom is displaced by 0.606 Å above the least-squares plane of the four coordinating atoms of the salen unit, and the mean value of the V=O bond distance is 1.584 (2) Å. Crystallographic details for [(VO-(salen))2Na]BPh4: space group P1 (triclinic), a = 16.053 (4) Å, b = 17.199 (4) Å, c = 11.221 (1) Å, α = 87.01 (2)°, β = 101.01 (2)°, γ = 124.29 (2)°, V = 2506.6 Å3, Z = 2. The final R factor was 4.4% for 3161 observed reflections. It was found that the complexation of potassium cation by the same ligand occurs only in the presence of a catalytic amount of Na+.
Pasquali, Marco; Marchetti, Fabio; Floriani, C; Cesari, M.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11568/208007
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