SYNTHESIS AND CHARACTERIZATION OF COPPER(II), NICKEL(II), AND COBALT(II) BINUCLEAR COMPLEXES WITH A NEW TRICYCLIC OCTADENTATE LIGAND, 1,5,8,12,15,19,22,26-OCTAAZATRICYCLO[17.9.2.25,15]DOTRIACONTANE (TCOA) - TRAPPING OF CO2 IN A NEUTRAL AQUEOUS-SOLUTION

A new tricyclic ligand, 1,5,8,12,15,19,22,26-octaazatricyclo [17.9.2.2(5,15)]dotriacontane (tcoa) was prepared from 1,4,8,11-tetrakis(2-(tosylamino)ethyl)-1,4,8, 11-tetraazacyclotetradecane and 1,3-propanediyl ditosylate by a cyclization reaction of 1:2 molar ratio, respectively. Eight copper(II), one nickel(II), and two cobalt(II) binuclear complexes of tcoa were parepared and characterized by elemental analyses, IR spectra, electronic absorption and reflectance spectra, magnetic susceptibility, and X-ray crystal analyses. [Cu2(tos)2(tcoa)](ClO4)2.4H2O(tos represents the tosylate ion) crystallizes in the triclinic system, space group P1, with a = 11.811 (3) angstrom, b = 12.448 (1) angstrom, c = 9.994 (2) angstrom, alpha = 106.23 (1)-degrees, beta = 113.45 (1)-degrees, and gamma = 76.98 (1)-degrees. [Cu2(tcoa)](CIO4)4.H2O reacted in aqueous solutions with various anions, F-, Cl-, Br-, I-, and N3-, to form anion-bridged complexes. [Co2OH(tcoa)]CIO4)3 rapidly trapped CO2 in an aqueous solution to form [Co2CO3(tcoa)](ClO4)2.3H2O quantitatively. [Co2CO3(tcoa)](ClO4)2.3H2O crystallizes in a monoclinic system, space group P2(1)/a, with a = 17.641 (6) angstrom, b = 17.139 (6) angstrom, c = 12.559 (4) amgstrom, and beta = 91.60 (2)-degrees.