Synthesis and crystal structures of two azido-bridged copper(II) complexes with schiff bases

Two new end-on azido-bridged dinuclear copper(II) complexes with the formula [Cu(mu(1,1)-N-3)(2)(IEP)(2)] (I) and [Cu(mu(1,1)-N-3)(2)(EMP)(2)] (II), where IEP and EMP are the deprotonated forms of 2-[1-(2-isopropylaminoethylimino)ethyl]phenol and 2-ethoxy-6-[(2-methylaminoeth-ylimino)methyl]phenol, respectively, were synthesized. Both complexes were characterized by elemental analyses and IR spectra. The crystal structures were determined by the X-ray diffraction. The crystal of I is monoclinic: space group P2(1)/c, a = 9.662(2), b = 15.282(3), c = 10.639(2) , beta = 115.418(10)A degrees, V = 1418.9(5) (3), Z = 2. The crystal of II is monoclinic: space group P2(1)/n, a = 12.588(2), b = 7.705(1), c = 14.481(2), beta = 91.736(5)A degrees, V = 1403.9(2) (3), Z = 2. The two Cu atoms in each complex are bridged by two end-on azide groups. Each Cu atom is in a square pyramidal coordination. The CuaEuro broken vertical bar Cu distances are 3.230(2) in I and 3.150(2) in II.