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DOI: 10.1039/A800393I (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1998, 1879-1884

Synthesis and co-ordination chemistry of 1,7-bis(carboxymethyl)-4,10-bis(1-methylimidazol-2-ylmethyl)-1,4,7,10-tetraazacyclododecane

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Massimo Di Vaira, Fabrizio Mani and Piero Stoppioni

Abstract

The potentially octadentate ligand 1,7-bis(carboxymethyl)-4,10-bis(1-methylimidazol-2-ylmethyl)-1,4,7,10-tetraazacyclododecane (H2L), which contains two oxygen and two nitrogen donors on the groups attached to the macrocycle, has been isolated and characterized as the pentahydro-bromide or -perchlorate, H2L·5HY (Y = Br or ClO4). Its co-ordination chemistry towards nickel(II) and zinc(II) ions has been investigated and the structures of the complexes which have been obtained, [NiL]·6.5H2O 1, [Ni(H1.5L)][ClO4]1.5·2H2O 2 and [Zn3L2][ClO4]2·5H2O 3, have been determined by single-crystal X-ray analyses. The metal ion in 1 and 2 is in an approximately octahedral environment formed by the four nitrogen donors of the macrocycle and two donors from the dangling groups, either carboxyl oxygens 1 or methylimidazole nitrogens 2. In the trimetallic zinc complex two metal ions, in peripheral positions, are seven-co-ordinated, whereas the third is tetrahedrally four-co-ordinated.

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