Synthesis and characterization of the nickel(II) complex of a macrocyclic Schiff base ligand with a single pendant coordinating hydroxyl arm

The synthesis and characterization of a nickel(II) complex of the ligand 8,9,18,19-tetrahydro-7H, 17H-dibenzo[ f,o][1,5,9,13] dioxadiazacyclohexadecin-18-ol (L) is described. Complex [NiL(NO3)] NO3 was prepared by facile template reaction of the appropriate dialdehyde 2-(3-(2-formylphenoxy)-2-hydroxypropoxy) benzaldehyde ( 1) and 1,3- diaminopropane in the presence of nickel nitrate. X-Ray crystallography indicated that the compound was a six-coordinate complex that contained a pentadentate ligand and an NO3- anion trans to the alcoholic donor. The blue complex contains nickel(II) in a distorted octahedral environment of N2O4 donors, and crystallizes in the monoclinic space group C2/c with a 26.921(10), b 9.075(2), c 21.193(7) Angstrom, beta 122.12(2)degrees, and Z 8. From spectro-scopic and conductivity studies of the complex it has been found that six-coordinate [NiL(NO3)](+) cations and NO3- anions are formed in solution.