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Two novel zinc(II) complexes containing 4-methoxybenzylidene moieties namely, Zn(L)Cl 2  (L = N, N′-bis(4-methoxybenzylidene)ethane-1, 2-diamine ( 1 ) or N-(4-methoxybenzylidene)-ethane-1, 2-diamine ( 2 )) have been synthesized and characterized by infrared spectroscopy and single-crystal X-ray diffraction. Complex  1  crystallizes in the monoclinic space group  P 2 1 / c  with  a  = 9.2315(4);  b  = 12.0449(4);  c  = 18.2164(7) Å;  β  = 98.472(4)°,  V  = 1278.9(4) Å 3  and  Z  = 4. Complex  2  crystallizes in the monoclinic space group  P 2 1 / n  with  a  = 6.5733 (2),  b  = 13.6595(5),  c  = 15.1615(5) Å;  β  = 101.846(4)°,  V  = 1332.33(8) Å 3  and  Z  = 4. The environment of each Zn(II) atom is distorted tetrahedral with coordination of two terminal Cl atoms and two N atoms of the N,N′ – bis(4-methoxybenzylidene)ethane-1,2-diamine ( 1 ) or N-(4-methoxybenzylidene)ethane-1,2-diamine ( 2 ) ligand. The stability of the crystalline structure is ensured by the existence of intra- and intermolecular hydrogen bonds of the type C–H … Cl ( 1 ) and N–H … Cl ( 2 ) leading to supramolecular topologies.

Synthesis, characterization and crystal structure of 4-methoxybenzylidene-based zinc(II) complexes