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Zn(II) complexes with pyridine derived N6 and N8 donor azamacrocyclic ligands |
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| Authors: | Ma del Carmen Fernndez-Fernndez Rufina Bastida Alejandro Macías Paulo Prez-Lourido Laura Valencia |
| Institution: | aDepartamento de Química Inorgánica, Facultad de Química, Universidad de Vigo, 36310 Vigo, Pontevedra, Spain bDepartamento de Química Inorgánica, Universidad de Santiago de Compostela, Avda. de las Ciencias s/n 15782, Santiago de Compostela, Spain |
| Abstract: | A novel N6 macrocyclic ligand, L1 (2,8,14,20-tetramethyl-3,7,15,19,25,26-hexaaza-tricyclo19.3.1.19,13]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-tricyclo23.3.1.111,15]]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-tricyclo17.3.1.18,12] 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. |
| Keywords: | Zinc(II) complex Azamacrocyclic ligand X-ray crystal structures |
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