N,N′-ethylene-bis(3-methoxysalicylideneimine) mononuclear (4f) and heterodinuclear (3d-4f) metal complexes:: Synthesis, crystal structure and luminescent properties
N,N′-ethylene-bis(3-methoxysalicylideneimine) mononuclear (4f) and heterodinuclear (3d-4f) metal complexes:: Synthesis, crystal structure and luminescent properties
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DOI：
10.1016/j.ica.2007.10.021
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发表时间：
2008-05-20
影响因子：
2.8
通讯作者：
Gao, Jin-Sheng
中科院分区：
文献类型：
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作者：
Gao, Ting;Yan, Peng-Fei;Gao, Jin-Sheng
通过对过程中产生的中间产物和最终产物的结构测定，研究了单核（4f）和异双核（3d-4f） salen样配合物的逐步合成。第一步，配体H2L与Ln(NO3)(3)中心点6H(2)O反应生成三个单核镧系配合物Ln(H2L)(NO3)(3) [H2L = N，N′-乙烯-双（3-甲氧基水杨酸基亚胺），Ln = Nd (1), Eu(2)和Tb(3)]，其中N，N′-乙烯-双（3-甲氧基水杨酸基亚胺）作为四齿配体与O2O2组供体原子有效配位。这些物种相当稳定，并已被隔离。然后，将Cu(Ac)(2)中心点H2O加入到单核镧系配合物中，得到预期的异核（3d-4f）配合物Cu(L)Ln(NO3)(3)中心点H2O [Ln = Nd (4) and Eu(5)]，其中Cu（II）离子插入到内部N2O2腔中。发光分析表明，配合物3表现出Tb（III）离子特有的金属中心荧光。然而，Sm（III）和Eu（III）离子在溶液和固体状态下均未观察到其特征发光。(C) 2007 Elsevier B.V.版权所有
The stepwise synthesis of mononuclear (4f) and heterodinuclear (3d-4f) Salen-like complexes has been investigated through structural determination of the intermediate and final products occurring in the process. In the first step, reactions of ligand H2L and Ln(NO3)(3)center dot 6H(2)O give rise to three mononuclear lanthanide complexes Ln(H2L)(NO3)(3) [H2L = N,N'-ethylene-bis(3-methoxysalicylideneimine), Ln = Nd (1), Eu (2) and Tb (3)], in which N,N'-ethylene-bis(3-methoxysalicylideneimine) acts as tetradentate ligands with the O2O2 set of donor atoms capable of effective coordination. These species are fairly stable and have been isolated. Then, addition of Cu(Ac)(2)center dot H2O to the mononuclear lanthanide complex yields expected heterodinuclear (3d-4f) complexes Cu(L)Ln(NO3)(3)center dot H2O [Ln = Nd (4) and Eu (5)] where the Cu(II) ion is inserted to the inner N2O2 cavity. Luminescent analysis reveals that complex 3 exhibits characteristic metal-centered fluorescence of Tb(III) ion. However, the characteristic luminescence of both Sm(III) and Eu(III) ions is not observed both in solution and solid state of the complexes. (C) 2007 Elsevier B.V. All rights reserved.