Synthesis, characterization and coordination chemistry of aminophenylbenzothiazole substituted 1,4,7-triazacyclononane macrocycles
作者:José Barreto、Taracad K. Venkatachalam、Tanmaya Joshi、Ute Kreher、Craig M. Forsyth、David Reutens、Leone Spiccia
DOI:10.1016/j.poly.2012.10.029
日期:2013.3
The synthesis and spectroscopic characterization of four new 2-(4-aminophenyl)benzothiazole substituted 1,4,7-triazacyclononane derivatives with and without appended pyridyl groups on the macrocycle is reported: 1-(2-(4-aminophenyl)benzothiazolyl)-2-oxoethyl)-1,4,7-triazacyclononane (L1), 1-(2-(4-aminophenyl)benzothiazolyl)-2-oxoethyl)-4-(2-pyridylmethyl)-1,4,7-triazacyclononane (L2), 1-(2-(4-N-methylaminophenyl)benzothiazolyl)-2-oxoethyl)-4-(2-pyridylmethyl)-1,4,7-triazacyclononane (L3), 1,4-bis (2-pyridylmethyl)-7-(2-(4-aminophenyl)benzothiazolyl)-2-oxoethyl)-1,4,7-triazacyclononane (L4). The ligands have been applied in the synthesis of a series of copper (II) complexes, [Cu(L1)(OH2)](ClO4)(2)center dot 0.5ACN (C1), [Cu(L3)](ClO4)(2)center dot ACN (C2) and [Cu(L4)(OH2)](ClO4)(2)center dot 0.5THF (C4) whose structures have been determined by X-ray crystallography. As commonly observed for Cu(II) complexes of 1,4,7-triazacyclononane derivatives, the geometry of the metal centre ranges from distorted square pyramidal to pseudo-octahedral. Notably, the amide carbonyl coordinates to the copper(II) centre in C1 and C2 but not in C4 where the presence of an additional pyridyl group results in an N5 coordination sphere. (C) 2012 Elsevier Ltd. All rights reserved.