| Autor: |
En-Qing Gao, Qi-Hua Zhao, Alaa E., Jin-Kui Tang, Dai-Zheng Liao, Zhong-Hui Jiang, Alaa E., Shi-Ping Yan |
| Předmět: |
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| Zdroj: |
Journal of Coordination Chemistry; 2/1/2002, Vol. 55 Issue 2, p205-213, 9p, 1 Diagram, 2 Charts, 1 Graph |
| Abstrakt: |
A new terephthalato-bridged binuclear nickel(II) complex with a tetraazamacrocyclic compound as the terminal ligand, [Ni 2 (cth) 2 (µ-TPHA)](ClO 4 ) 2 (1) [cth= rac -5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane] has been synthesized and characterized. According to X-ray crystallographic studies on the solvated species 1·2CH 3 OH, each Ni(II) ion lies in a distorted octahedral environment, and the terephthalato ligand bridges two Ni(II) ions in a bis bidentate fashion. Cryomagnetic measurements revealed Curie-Weiss behaviour with θ=-1.4 K. Such behaviour may be due to a very weak intramolecular superexchange interaction through the extended bridge, a weak intermolecular exchange interaction or the local zero-field splitting of Ni(II) ions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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