Synthesis and crystal structure of a mixed-ligand compound di-n-butyl(4-chlorobenzoxy)(4-chlorobenzohydroxamato)tin(IV)

Reaction of dibutyltin dichloride with 4-chlorobenzohydroxamic acid and 4-chlorobenzoic acid in 1:1:1 stoichiometry yields the new title compound di-n-butyl(4-chlorobenzoxy)(4-chlorobenzohydroxamato)tin(IV) 1, which had been characterized by IR and 1H, 13C, 119Sn NMR. Single X-ray crystal structure analysis has been determined for 1, which crystallizes as the five-coordinate mixed-ligand dibutyltin(IV) complex containing both monodentate and bidentate ligands. The crystal structure of the compound reveals that the tin atom adopts distorted trigonal bipyramidal geometry with the Bu groups trans to each other. The C–Sn–C angle is 145.9(3)°, and the Sn–O bonds are 2.083(4) and 2.158(4) Å in one ligand and 2.242(4) Å in the other. An unusual feature of the structure is the presence of a kind of intermolecular hydrogen bonding which serves to stabilize the crystal structure.