Synthesis And Characterization Of A 15-Membered O2n2 Macrocycle Containing An N-Carboxyl Acid. The Crystal Structure Of Copper Complex

The compound (1,2-diaza-3,4;9,10-dibenzo-5,8-dioxacyclopentadecaneacetate HL) and its complexes ML (M = Cu, Co, Ni) have been prepared and characterized using analytical data, IR, electronic and FAB mass spectra. The copper(II) complex crystal is monoclinic, space group P2(1)/a with a=12.302(4), b=13.244(4), c=15.774(6)Angstrom, beta=98.59 degrees, V=2541(1)Angstrom(3), Z=4, lambda(MoK alpha)=0.71069, R-w=0.018 for 3305 observed reflections [I > 3 sigma(I)]. It has been found that the copper ion is surrounded by two nitrogen atoms and one oxygen atom from the carboxyl of the ligand and two oxygen atoms of coordinated water molecules in a distorted square pyramidal arrangement. The two ether oxygen atoms of the macrocycle do not coordinate.