Synthesis and Crystal Structure of Dissymmetrical Double Schiff Base Cu(II) Homobinuclear and Cu(II)‐Mg(II)‐Cu(II) Heterotrinuclear Complexes

Homobinuclear complex (HCuL) 2 ( 1 ) (H 3 L: N ‐3‐carboxylsalicylidene‐ N′ ‐salicylaldehyde‐1,2‐diaminoethane) was obtained from self‐organization of the reported complex HCuL, and its crystal structure was determined through X‐ray diffraction at room temperature. The crystal of complex 1 belongs to monolinic system, the space group Cc , a =2.5326(5) nm, b =0.88861(18) nm, c =1.3738(3) nm, β =96.95(3)°, Z =4, R 1 =0.0520, wR 2 =0.1185. (HCuL) 2 is a dimeric molecule and has extended phenolic oxygen‐bridged structure. In addition, using mononuclear complex HCuL as building blocks, Cu(II)‐Mg(II)‐Cu(II) heterotrinuclear complex 2 was synthesized, and its crystal structure also has been determined by X‐ray analysis. The crystal of complex 2 is of monoclinic system, space group P c , a =1.1816(2) nm, b =1.5599(3) nm, c =1.9642 (4) nm, β =98.22°, Z =2, R 1 =0.0701, wR 2 =0.1498. Each dissymmetrical cell unit of complex 2 contains two heterotrinucler neutral molecules: {[CuL(H 2 O)]Mg[CuL(CH 3 OH)]} and {[CuL]Mg[CuL(H 2 O)]}.