Hydrothermal syntheses, structures and properties of three cyclic tetranuclear complexes and one ID chain complex with 3,5-dinitrosalicylate

作者：Wen De Cai; Liu Shi Xiong^*; Ribas Joan

来源：Polyhedron, 2007, 26(14): 3849-3856.

DOI：10.1016/j.poly.2007.04.028

• metallamacrocycle
• supramolecular isomerism
• hydrothermal synthesis
• cobalt complex
• zinc complex

The hydrothermal reactions of Co(OAc)(2)center dot 4H(2)O, 3,5-dinitrosalicylate (3,5-(NO2)(2)sal) and 2,2'-bipyridine (2,2'-bipy) with different reaction periods give metallamacrocycles 1 and 2 with the same chemical formula CO4(2,2'-bipy)(4){3,5-(NO2)(2)sal}(4). Replacing Co(OAc)(2)center dot 4H(2)O with Zn(NO3)(2)center dot 6H(2)O, using the same synthetic procedures, results in the formation of compound [Zn(2,2'-bipy)-{3,5-(NO2)(2)sal}], (3) with a 1D chain structure and the metallamacrocycle compound Zn-4(2,2'-bipy)(4){3,5-(NO2)(2)sal}(4) (4). Compounds 1 and 2 crystallize as two different polymorphs of cyclic tetranuclear compounds. Compounds 3 and 4 are polymorphic too. The compounds 1 and 4 are isomorphous. The weak coordination interactions have significant influence on the spacial orientations of the 3,5-(NO2)2sal ligand, and may affect the crystallization processes. There are antiferromagnetic interactions in the cyclic tetranuclear cobalt(II) compounds 1 and 2. Compound 3 exhibits weak fluorescent emission in the solid state at room temperature.

• 出版日期2007-8-31
• 单位龙岩学院; 福州大学