In this complex, the copper(I) ion is in a distorted fourcoordinate tetrahedral geometry. <...> The Schiff base py-Clan ligand acts as a chelating ligand and coordinates to the copper center via two nitrogen atoms. <...> The coordination chemistry of copper(I) complexes with bidentate diimine ligands, such as bipyridine and phenantroline, has recieved much attention over the last decades due to the potential application of these complexes in catalytic processes [ 1—3], photochromism and electrochemical properties [ 4, 5 ], the design of coordination polymers [ 6, 7 ], metallosupramolecular cylinder [ 8 ], and grid complexes [ 9 ]. <...> Most of the studies have been made on tetrahedral copper(I) complexes of the [Cu(LL)2]+ type where LL is a diimine Schiff base [ 10, 11 ]. <...> Although reports on copper(I) complexes are numerous, limited works were performed on mixed ligand copper(I) complexes of the [Cu(LL)PX] type (X = Cl, Br, I) [ 12, 13 ]. <...> This study is a part of our ongoing effort to synthesize and characterize copper(I) complexes with a bidentate Schiff base ligand [ 6, 7, 13 ]. <...> Herein, we report the synthesis and crystal structure of the mixed ligand copper(I) complex [Cu(py-Clan)(PPh3)I] (Scheme 1). 1Department of Chemistry, Golestan University, Faculty of Science, Gorgan, Iran E-mail: ad.khalaji@gu.ac.ir . 183 – 186 Scheme 1. <...> Infrared spectra were recorded using KBr disks on a FT-IR Perkin—Elmer spectrophotometer. <...> Elemental analyses were carried out using a Heraeus CHNO-Rapid analyzer. © Khalaji A.D., Jafari K., Fejfarova K., Dusek M., 2015 184 Preparation of 4-chlorophenylpyridine-2-ylmethyleneamine (py-Clan). <...> A solution of pyridine-2-carbaldehyde (1.07 g, 0.01 mol) in 25 ml diethylether was added to a solution of 4-chloroaniline (1.28 g, 0.01 mol) in 10 ml diethylether and stirred for 30 min. The py-Clan ligand was obtained as white microcrystalline powder. <...> The mixture was stirred for 10 min and then 146 mg (1 mmol) of py-Clan in 5 ml acetonitrile were added and stirred for an additional 10 min. Slow evaporation of the solvent at room temperature gave title compound (1) as dark <...>