Syntheses and Crystal Structures of Two Copper(II) Complexes Derived from Bidentate Schiff Bases

Two new Cu（II） complexes have been synthesized with two different bidentate N;O;donor Schiff base ligands HL;(2-(（E）-（4-chlorophenylimino）methyl)-6-bromo-4-chlorophenol) and HL;(2-(（E）-（2-chlorophenylimino）methyl)-6-bromo-4-chlorophenol), respectively. Both complexes 1 and 2 have been characterized by elemental analysis and single-crystal X-ray diffraction studies. Structural studies reveal that in both complexes the metal centers are four-coordinated with N;O;donor set of Schiff base ligands. Complex 1 belongs to the tetragonal system, space group P4（3）2（1）2 with a = 10.2379（2）, b = 10.2379（2）, c = 24.9623（90） , V = 2616.41（12） ;, Z = 4, D;= 1.908 g/cm;, μ（MoKα） = 4.3327 mm;, F（000） = 1468, S = 0.999, the final R = 0.0345 and wR = 0.0835 for 3506 unique reflections (R;= 0.0428) with 3249 observed ones (I > 2σ（I）). Complex 2 is of monoclinic system, space group P21/c with a = 11.064（3）, b = 9.437（2）, c = 13.277（4）, β = 108.997（3）°, V = 1310.8（6） ;, Z = 2, D;= 1.904 g/cm;, μ（MoKα） = 4.319 mm;, F（000） = 734, S = 0.997, the final R = 0.0282 and wR = 0.0619 for 3491 unique reflections (R;= 0.0428) with 2777 observed ones (I > 2σ（I）). The units of the complex are linked via weak interactions, such as C-H…Br hydrogen bonds together with Cl…Cl and Cu…Cl interactions, leading to the formation of one-dimensional chain and two-dimensional network and stabilizing the crystal structure.