Self-Assembly of a Tetranuclear Ni4 Cluster with an S = 4 Ground State: The First 3d Metal Cluster Bearing a 4<
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- 作者：Matilde Fondo ; Noelia Ocampo ; Ana M. Garcí ; a-Deibe ; Ramó ; n Vicente ; Montserrat Corbella ; Manuel R. Bermejo ; and Jesú ; s Sanmartí ; n
- 刊名：Inorganic Chemistry
- 出版年：2006
- 出版时间：January 9, 2006
- 年：2006
- 卷：45
- 期：1
- 页码：255 - 262
- 全文大小：183K
- 年卷期：v.45,no.1(January 9, 2006)
- ISSN：1520-510X
文摘
Reaction of nickel(II) acetate with H3L (2-(5-bromo-2-hydroxyphenyl)-1,3-bis[4-(5-bromo-2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine) yields [Ni2L(OAc)(H2O)2]·3MeCN·2H2O (1·3MeCN·2H2O), crystallographically characterized.1 is unstable in solution for a long time and hydrolyzes to give [Ni2L(o-OC6H3BrCHO)(H2O)]·2.25MeCN·H2O (2·2.25MeCN·H2O). In addition, 1 uptakes CO2 from air in a basic methanol/acetonitrile solution, yielding {[Ni2L(MeOH)]2(CO3)}·1.5MeOH·MeCN·H2O (3·1.5MeOH·MeCN·H2O). The X-ray characterization of 3 reveals that it isa tetranuclear nickel cluster, which can be considered as the result of a self-assembly process from two dinuclear[Ni2L]+ blocks, joined by a 
4-
2:2-O,O carbonate ligand. The coordination mode of the carbonate anion is highlyunusual and, to the best of our knowledge, it has not been described thus far for first-row transition metal complexesor magnetically studied until now. Magnetic characterization of 1 and 3 shows net intramolecular ferromagneticcoupling between the metal atoms in both cases, with S = 2 and S = 4 ground states for 1 and 3, respectively.
4-2:2-O,O carbonate ligand. The coordination mode of the carbonate anion is highlyunusual and, to the best of our knowledge, it has not been described thus far for first-row transition metal complexesor magnetically studied until now. Magnetic characterization of 1 and 3 shows net intramolecular ferromagneticcoupling between the metal atoms in both cases, with S = 2 and S = 4 ground states for 1 and 3, respectively.