Co-ordinative interactions between tin(II) and tin(IV) and tin(II) and arsenic(III) in di-µ-nitrato-bis[(triphenylarsine)(triphenylstannio)tin(II)]

Abstract

The structure of the title compound has been solved from X-ray diffractometer data by the heavy-atom method and refined by least-squares techniques to R 0.060 for 4 409 independent reflections. Crystals are triclinic, space group P, with unit-cell dimensions: a= 11.29(1), b= 12.02(1), c= 13.68(1)Å, α= 102.0(1), β= 113.3(1), γ= 104.0(1)°, and Z= 2. The structure consists of molecules of formula [{Sn^II(NO₃)(AsPh₃)(Sn^IVPh₃)}₂] in which Sn^II is five-co-ordinate in a highly irregular way by two adjacent [NO₃]^– anions and by the two triphenyl-metal groups, where a disordered distribution involving Sn and As is present. The nitrate groups bridge the two Sn^II atoms in the dimer in a rather unusual way.