Copper(II) Complexes with N-(3-Hydroximino-2-methylbutan-2-yl)methylamine (HL): Synthesis and Properties. Crystal and Molecular Structures of [Cu(HL)Cl2] and [Cu(HL)(H2O)2SO4]n

Paramagnetic copper(II) complexes with N-(3-hydroximino-2-methylbutan-2-yl)methylamine (HL), namely, Cu(HL)Cl2(I), Cu(HL)(SO4) · 2H2O (II), and Cu(HL)(NO3)2(III), were obtained. The crystal structures of I and II were determined. The blue crystals of these compounds are monoclinic. For I(C6H14Cl2CuN2O): a = 8.820(1) Å, b = 6.511(1) Å, c = 18.255(2) Å, β = 92.86(1)° V = 1047.0(2) Å3, space group P21/c, ρcalcd = 1.679 g/cm3, Z = 4 for R1 = 0.0250; for II(C6H18CuN2O7S): a = 9.999(2) Å, b = 9.927(2) Å, c = 12.963(3) Å, β = 106.37(3)°, V = 1234.5(4) Å3, space group P21/c, ρcalcd = 1.753 g/cm3, Z = 4 for R1 = 0.0324. Crystals of I have a molecular structure. The Cu coordination polyhedron is a square bipyramid (2N + 2Cl + Cl + Cl) due to additional contacts with two Cl atoms from the neighboring molecules. Structure II is built from polymeric chains. The environment of the Cu atom is a distorted cis-octahedron (2N + 2O(H2O) + 2O(SO4)). Complexes I–IIIare characterized by IR and EPR spectroscopy.