Synthesis and crystal structure of binuclear copper complex of 4,7,13,16-tetrabenzyl-1,10-dioxa-4,7,13,16-tetraaza-cyclooctadecane

A new crown ether derivative 4,7,13,16-tetrabenzyl-1,10-dioxa-4,7,13,16-tetraaza-cyclooctadecane together with its binuclear copper(II) complex have been prepared and characterized by elemental analysis, IR, NMR and UV spectra. X-ray diffraction study shows that the complex crystallizes in the monoclinic system, C2/c space group, with a=29.052(10), b=10.398(4), c=21.084(7)Å,β=128.538(5)°, V=4982(3)Å3 and Z=4. It also reveals that in the binuclear structure, each copper(II) ion is coordinated to two nitrogen atoms from the crown ether and three oxygen atoms, one from the crown ether, one as bridge from hydroxide group, and the third from the water molecule. The coordination polyhedron is a distorted trigonal bipyramid.