Thiosemicarbazone Derivatives of Copper(I): Influence of Substituents (R) at N1 Atom of [(C5H4N)HC2=N3N2H-C1(=S)N1HR] in the Formation of 1D or 2D Networks of Copper(I) Complexes

Copper(I) halides with N-1-substituted pyridine-2-carbaldehyde thiosemicarbazones [(C5H4N)HC2=(NNH)-N-3-H-2-C-1(=S)(NHR)-H-1] in the presence of Ph3P have formed complexes of stoichiometry, [CuX(Hpytsc-(NHR)-H-1)(Ph3P)(2)] [X, R; Br, Me (1); Br, Et (2), Cl, Ph (3 center dot CH3CN)]. All these complexes are characterised by elemental analysis, IR and NMR (H-1, P-31) spectroscopy and X-ray crystallography. The role of substituents at N-1 atom of pyridine-2-carbaldehyde thiosemicarbazones in intermolecular interactions in copper(1) complexes is described. A 1D polymer of compound 1 is formed by intermolecular CH(methyl)center dot center dot center dot pi((py)) interactions. The hydrogen atoms of (EtNH)-H-1 and ethyl group interact with the phenyl ring of PPh3 {via (EtNH)-H-1 center dot center dot center dot pi((Ph)), H2CH(Et)center dot center dot center dot pi((Ph))} to form a ID polymer of 2. A 2D sheet arrangement of compound 3 is formed by pyridyl-phenyl (CH(py)center dot center dot center dot pi((Ph))) interactions along the a axis and phenyl-phenyl [CH(Ph)center dot center dot center dot pi((Ph))] interactions (phenyl at N-1 with phenyl of PPh3) along the b axis.