Zn(II) complexes with pyridine derived N6 and N8 donor azamacrocyclic ligands
- 作者：M del Carmen Ferná ; ndez-Ferná ; ndez ; Rufina Bastida ; Alej ; ro Mací ; as ; Paulo Pé ; rez-Lourido ; Laura Valencia
- 关键词：Zinc(II) complex ; Azamacrocyclic ligand ; X-ray crystal structures
- 刊名：Polyhedron
- 出版年：2007
- 期刊代码：87_02775387
- 类别：ch
- 出版时间：20 November 2007
- 卷：26
- 期：18
- 页码：5317-5323
- 文件大小：362 K
摘要
A novel N6 macrocyclic ligand, L1 (2,8,14,20-tetramethyl-3,7,15,19,25,26-hexaaza-tricyclo[19.3.1.19,13]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 L1, of a related N8 macrocycle, L3 (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 L1 prepared from diformyl pyridine and ethane-1,2-diamine, L2 (3-[6,14,17-tris-(2-cyano-ethyl)-3,6,14,17,23,24-hexaaza-tricyclo[17.3.1.18,12] tetracosa-1(23),8(24),9,11,19,21-hexaen-3-yl]-propionitrile), were prepared. Structures were determined for [ZnL1](ClO4)2 · H2O, [ZnL2](NO3)2 and [Zn2L3(NO3)2](NO3)2 · H2O. The [ZnL1](ClO4)2 · 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 · 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.