作者:Ma del Carmen Fernández-Fernández、Rufina Bastida、Alejandro Macías、Paulo Pérez-Lourido、Laura Valencia
DOI:10.1016/j.poly.2007.07.035
日期:2007.11
A novel N6 macrocyclic ligand, L-1 (2,8,14,20-tetramethyl-3,7,15,19,25,26-hexaaza-tricyclo[19.3.1.1(9,13)]hexacosa-1(24),9,11,13(26), 21(25),22-hexaene), was obtained by reduction of the 2 + 2 condensation product of 2,6-diacetylpyridine and propane-1,3-diamine. Zinc(II) complexes of L-1, of a related N8 macrocycle, L-3 (3,6,9,17,20,23,29,30-octaaza-tricyclo[23.3.1.1[11,15]]triaconta-1(28),1,13,15(30), 25(29),26-hexaene), similarly prepared by 2 + 2 condensation of 2,6-diformylpyridine and diethylenetriamine and of a tetra N-2-cyanoethyl derivative of a homologue of L-1 prepared from diformyl pyridine and ethane-1,2-diamine, L-2 (3-[6,14,17-tris-(2-cyano-ethyl)3,6,14,17,23,24-hexaaza-tricyclo[17.3.1. 11,12] tetracosa-1(23),8(24),9,11,19,21-hexaen-3-yl]-propionitrile), were prepared. Structures were determined for [ZnL1](ClO4)(2) center dot H2O, [ZnL2](NO3)(2) and [Zn2L3(NO3)(2)](NO3)(2) center dot H2O. The [ZnL1](ClO4)(2) center dot H2O and [ZnL2](NO3)(2) complexes present a mononuclear endomacrocyclic structure with the metal in an octahedral distorted environment coordinated by the six donor nitrogen atoms from the macrocyclic backbone while the complex [Zn2L3(NO3)(2)](NO3)(2) center dot H2O is dinuclear with both metal atoms into the macrocyclic cavity coordinated by four donor nitrogen atoms from the macrocyclic framework and one oxygen atom from one monodentate nitrate anion, in a distorted square pyramidal arrangement. (c) 2007 Elsevier Ltd. All rights reserved.