113576-66-2Relevant academic research and scientific papers
Synthesis, Reactions and Copper(II), Nickel(II), and Zinc(II) Complexes of N-(2-Pyridinyl)ketothioacetamides
Iliopoulos, Peter,Murray, Keith S.
, p. 433 - 444 (2007/10/02)
The synthesis and properties of two N-(2-pyridinyl)ketothioacetamide ligands, HL , and their complexes with nickel(II), copper(II), and zinc(II) are described.The ligands are potential O, S, N donors and are sulphur analogues of the O, O, N donor N-(2-pyridinyl)ketoacetamide ligands (1).The failur of certain thionation methods in the preparation of (4) from (1) is demonstrated.Ligands (4) show analogous spectroscopic properties to those of (1) and display thioketo-enol tautomerism in solution but readily oxidize to the 2H-pyridothiadiazoles (5).This redox activity is shown to be decreased at low temperatures and eliminated in the N-benzyl-N-(2-pyridinyl)ketothioacetamides (6), the N-benzylated derivatives of (4).Complexes of the type (M=NiII, CuII or ZnII) display spectral and magnetic properties typical of four-co-ordinate complexes in which co-ordination of the ligands is via the S,N donor sets with the O donor remaining unco-ordinated.E.s.r. spectra of a complex doped into and lattices show marked differences depending on the host, with the former being typical of planar coordination while the latter gives a rather unusual lineshape of distorted tetrahedral geometry.
