Crystal structure of tetraamminetetra(4-methoxycinnamato)- dicopper(II), Cu2(NH3)4(C10H9O3)4

Abstract

Source of materialCrystals of the title compound were unexpectedly formed during an experiment to synthesize amixed-ligand copper complex. In the title crystal structure, the Cu atoms are coordinated by three oxygen atoms of three 4-methoxycinnamate ligands and two ammonia nitrogen atoms (CuO 3N2)i nasquare pyramidal manner. The 4-methoxycinnamate anions display trans conformation and coordinate the Cu atoms in monodentate fashion to generate a dinuclear moiety. As expected the C-Obond lengths of the coordinating Oa toms are 1.293(3) and 1.271(3) Å,r espectively, which is significantly longer than that of the non-coordinating one (1.242(3) and 1.243(3) Å). The Cu1-N1 bond lengths (1.977(2) and 1.985(2) Å)a re comparable with the known Cu carboxylate [6]. The Cu-Obond length range from 1.976(2) to 2.440(2) Å,and are longer than the reported result [8]. The angle ∠O4-Cu1-O1 =177.71(8)°is very close to 180°,and O-Cu-N bond angles are close to 90°also, which implies the pyramide CuO 3N2 is only slightly distorted. The Cu···Cu separation within the dimeric unit is of 3.433 Å,which is larger than the reported results [8]. The presence of CH 3 ···O, C-H···p,C H 3 ···p,a nd N-H···Oh ydrogen bonds between two neighboring dinuclear moieties sets up astrong hydrogen bonding network.