Synthesis and crystal structure of a New Diamine complex CuCl 4 (H 2 tn)

In an attempt to synthesize a new pyrimidine complex of copper(II) in a solution reaction of CuBr 2 with 2,2′‐bis(hexahydropyrimidine) and hydro‐chloric acid, we unexpectedly obtained a bright yellow chip‐like crystal of CuC 4 (H 2 tn) [H,tn=(H 3 NCH 2 CH 2 CH 2 NH 3 ) 2+ ]. Its structure was determined by single‐crystal X‐ray diffraction analysis. The crystal belongs to orthorhombic system, space group Pnma , with cell parameters: a=0.7216(2) nm, b= 1.8308(6) nm, c=0.7553(3) nm, V=0.9953(6) nm 3 , Z=4, F(000)=564, M r =281.49, D,= 1.879 g/cm 3 . μ(Mo Ka)=3.204 m −1 , R 1 =0.0248, wR 2 =0.0575 . The analysis of the crystal structure indicates that the complex has a three‐dimensional network structure, which is formed by hydrogen bonds and electrostatic interaction.