Tetraaquabis l,2-Benzisothiazol-3 2H -one 1,1-dioxidato vanadium II Dihydrate

Tetraaquabis(l,2-benzisothiazol-3(2H)-one 1, l-dioxidato)vanadium(II) dihydrate is a compound with a remarkable stability toward air, particularly 

In spite of its electronic configuration, the substitution reactions of the complex are relatively fast. It is soluble in ethanol but is virtually insoluble in water. However, it sometimes forms supersaturated solutions in water, and may take very long periods of time to crystallize. 

Single crystal X-ray analysis shows that the compound crystallizes in the monoclinic space group P2,/c with a = 7.936(2)A, b= 16.149(5)A, c = 7.731(2)A, )S = 99.84(2), K = 976.2(8)A and Z = 2. There is a centro-symmetric arrangement of two saccharinate nitrogen atoms and four water molecules around the vanadium center. 

BENZISOTHIAZOL-3(2H)-ONE 1,1-DIOXIDATO)-TETRAKIS(PYRIDINE)VANADIUM(II)-DIPYRID1NE 

In a distillation apparatus, 140mL of pyridine is added to 7.73 g (14.8 mmol) of V(C7H4N03S)2(H20)4]-2H20. The deep red solution is warmed, and 

In a distillation apparatus, 140 mL of pyridine is added to 7.73 g (14.8 mmol) of V(C7H4N03S)2(H20)4]-2H20. The deep red solution is warmed, and 60 mL of the solvent is removed by distillation at slightly above ambient pressure (regulated by a mercury bubbler). The flask and its contents are cooled to room temperature, and a layer of 135 mL of hexane is carefully placed on the reaction solution. The flask is cooled to — 20°C, and after 1 day at this temperature a large crop of crystals forms. The mixture is shaken to mix the liquid phases and is returned to the freezer. The next day, the resulting black crystals are Filtered and washed with four 20-mL portions of hexane and are dried under vacuum for 5 min. Yield 13.0g (99%). 

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