[n-Bu2 NH2]3[SnPh3(SeO4)2]: the first triorganotin(IV) complex with terminally coordinated selenato ligands

Abstract

The reaction of SeO4 H2 and SnPh3 OH in the presence of n-Bu2 NH led to the formation of [(n-Bu2 NH2)]3[SnPh3(SeO4)2] (1), which crystallizes in the orthorhombic space group P21 21 21 with Z=4, a=16.2509(7) Å, b=17.2412(8) Å, c=17.6881(5) Å, and V=4955.9(3) Å3. The structure of the novel trianion of 1 consists of a SnPh3 moiety trans-coordinated by two monodentate selenato ligands involving a trigonal bipyramid geometry around the Sn(IV) atom. The charges of [SnPh3(SeO4)2]3- are compensated by three [n-Bu2 NH2]+ cations. From a supramolecular point of view, the three uncoordinated oxygen atoms of each selenato ligand are involved in hydrogen bonding interactions with the surrounding di-n-butylammonium cations through N-H···O contacts, leading to a three-dimensional network. The structural characterization of salt 1 was completed by infrared and NMR spectroscopy and elemental analysis, which confirm the X-ray elucidation.

Keywords

• hydrogen bonding
• selenate
• triphenyltin
• x-ray crystallography
• 3d supramolecular network