A mixed-bridged linear trinuclear copper(II) complex containing both square pyramidal and trigonal bipyramidal configuration

A novel trinuclear copper(II) complex, [Cu₃L₂(py)](ClO₄)₂·2THF (1) (H₂L=(E)-3-[N,N-di(2-pyridylmethyl) aminomethyl]-2-hydroxyl-5-methylbenzaldehyde oxime, py=pyridine, THF=tetrahydrofuran), has been successfully synthesized and characterized. 1 crystallizes in monoclinic system with space group C2/c, a=2.969 0(7) nm, b = 1.302 8(3) nm, c=2.057 4(9) nm, β=132.435(2)0, V=5.873(3) nm³, Z=4 with final R1=0.047 9. X-ray crystallography analysis reveals that 1 is a mixed-bridged (-N-O-/µ2-O-) linear tricopper(II) complex with all the copper cations being five-coordinated by three N and two O atoms: the central Cu (II) in a distorted trigonal bipyramidal configuration, whereas the peripheral Cu(II) in a distorted square pyramidal arrangement. Magnetic susceptibility measurement indicates that there is a medium antiferromagnetic exchange coupling between the Cu(II) ions with a J value of -33.3(5) cm^-1. CCDC: 916132.