Synthesis, Structure, and Magnetic Properties of Heterometallic Dicyanamide-Bridged Cu-Na and Cu-Gd One-Dimensional Polymers
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- 作者：Jean-Pierre Costes ; Ghenadie Novitchi ; Sergiu Shova ; Franç ; oise Dahan ; Bruno Donnadieu ; and Jean-Pierre Tuchagues
- 刊名：Inorganic Chemistry
- 出版年：2004
- 出版时间：November 29, 2004
- 年：2004
- 卷：43
- 期：24
- 页码：7792 - 7799
- 全文大小：246K
- 年卷期：v.43,no.24(November 29, 2004)
- ISSN：1520-510X
文摘
The monometallic precursors L1Cu and L2Cu (L1H2 standing for 1,3-bis((3-ethoxysalicylidene)amino) propane andL2H2 standing for 1,2-bis((3-methoxysalicylidene)amino) ethane) react with sodium dicyanamide (dca) (NaN3C2), amixture of gadolinium nitrate, and sodium dicyanamide to yield heterodinuclear L2CuNa(NCNCN) and L1CuGd(NO3)(NCNCN)2 entities. The structural determination shows that two Cu-Na entities are linked by dca with anoriginal 
1,1 coordination mode, evidenced here for the first time, to yield tetranuclear complexes. Two hydrogenbonds operate between the water molecule coordinated to one of the sodium ions and the free nitrogen atoms oftwo dca ligands, yielding infinite zigzag chains. The structural determination of the Cu-Gd entities indicates thatthey are held together by two dca ligands, bridging alternately Cu to Gd and Gd to Gd cations, in the morecommon 1,5 mode to yield a one-dimensional (1D) network. The dca ligands are not able to transmit interactionbetween the magnetically active centers in these chains, which are the unique example of structurally characterizedCu-Gd complexes involving dca ligands.
1,1 coordination mode, evidenced here for the first time, to yield tetranuclear complexes. Two hydrogenbonds operate between the water molecule coordinated to one of the sodium ions and the free nitrogen atoms oftwo dca ligands, yielding infinite zigzag chains. The structural determination of the Cu-Gd entities indicates thatthey are held together by two dca ligands, bridging alternately Cu to Gd and Gd to Gd cations, in the morecommon 1,5 mode to yield a one-dimensional (1D) network. The dca ligands are not able to transmit interactionbetween the magnetically active centers in these chains, which are the unique example of structurally characterizedCu-Gd complexes involving dca ligands.