SYNTHESES IN AQUEOUS-SOLUTION AND CRYSTAL-STRUCTURE OF A TRIAMIDO-BRIDGED DICOBALT(III) COMPLEX WITH THE LIGANDS 1,4,7-TRIAZACYCLONONANE AND 3-THIAPENTANE-1,5-DIAMINE

The reaction of Co(tacn)(daes)3+ [tacn = 1,4,7-triazacyclonane; daes = (3-thiapentane-1,5-diamine = di(2-aminoethyl)sulfide)] in 4 M NaOH yi elds nearly quantitively the triamido-bridged dicobalt(III) complex: 7 --triazacyclononane-2kappa3N1,N4,N7-dicobalt(III) ion, in the followin g abbreviated as Co(tacn-mu-N)(daes-mu2-N1,N2)Co(tacn)3+: [GRAPHICS] T he new dinuclear cation was isolated from the reaction mixture as a pe rchlorate salt in high yield (63%). The crystal and molecular structur e of [Co(tacn-mu-N)(daeS-mu2-N1,N2)Co(tacn)](ClO4)3, H2O has been esta blished by X-ray diffraction techniques at 122 K: a = 15.289(2), b = 2 1.392(2) and c = 17.834(4) angstrom, V = 5228(5) angstrom3, F(000) = 3 344, Z = 8, space group Pbca, R(w) = 0.038 for 3124 unique reflections .