Preparation and crystal structure of the complexes thallium(I) oxalohydroxamate(1–) and malono-hydroxamate(1–)

Abstract

Thallium(I) oxalohydroxamate 1, Tl(HONHCOCONHO), and malonohydroxamate 2, Tl(HONHCOCH₂CONHO), have been characterized as acid salts of type A₂ and B₂, respectively, using single-crystal X-ray diffraction. In 1 the co-ordination polyhedron around the Tl^I can be described as a distorted dodecahedron; the eight Tl–O bonds are divided into sets of six short and two long, the latter lying at one side of the Tl^I the lone-pair electrons of which are stereoactive. In 2 the co-ordination environment of Tl^I is square pyramidal with the lone-pair electrons oriented in the axial direction.