| Autor: |
Beckmann, Udo, Brooker, Sally, Depree, Craig V., Ewing, Janna D., Moubaraki, Boujemaa, Murray, Keith S. |
| Zdroj: |
Dalton Transactions; March 25, 2003, Vol. 2003 Issue: 7 p1308-1313, 6p |
| Abstrakt: |
A new Schiff-base macrocycle is obtained by the lead(ii) ion templated [2+2] condensation of 3,5-diacetyl-1H-1,2,4-triazole and 1,4-diaminobutane in the presence of sodium hydroxide. Transmetallation of the resulting dilead complex, Pb2(L2)(ClO4)2 1, in acetonitrile with two equivalents of CoCl2·6H2O leads to the isolation of an orange, six-coordinate complex, [CoII2(L2)(OH2)3(NCCH3)](ClO4)2·H2O·2CH3CN 2. Subsequent reaction of 2 with two equivalents of NaOCN or NEt4Cl yielded redpurple five-coordinate [CoII2(L2)(NCO)2] 3 and red five-coordinate [CoII2(L2)(Cl)2]·1.5CH3CN 4, respectively. In all three air-stable dicobalt complexes the macrocycles contain two high-spin cobalt(ii) centers which are weakly antiferromagnetically coupled (2J = −3.0, −0.4, −3.5 cm−1 for 2, 3 and 4, respectively). Complexes 24 have been characterized by X-ray diffraction and are the first structurally characterised complexes of a triazolate-containing macrocycle to date. |
| Databáze: |
Supplemental Index |
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