Solid State and Solution Study of Trinuclear (Ni, Ba, Ni) Complexes: (L12Ni)2Ba(ClO4)2·2H2O (1) and (L22Ni)2Ba(ClO4)2·2H2O (2) (L1 = 3-Methoxysalicylaldiminato and L2 = 3-(2-Methoxyethoxy)salicylaldiminato). Crystal and Molecular Structure of 2
| Autor: | Jean-Pierre Costes, Gérard Commenges, Philippe Chabert, Jean-Pierre Laurent, Françoise Dahan |
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| Rok vydání: | 1997 |
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| Zdroj: | Inorganic Chemistry. 36:656-660 |
| ISSN: | 1520-510X 0020-1669 |
| Popis: | The nickel(II) complexes of L1 = 3-methoxysalicylaldiminato and L2 = 3-(2-methoxyethoxy)salicylaldiminato react with barium ions to afford bimetallic complexes characterized by a Ba to Ni ratio of 1/2. A structural determination of the complex (L22Ni)2Ba(ClO4)2·2H2O (2) shows that it crystallizes in the orthorhombic space group Pbca (No. 61) with 8 formula units in the cell having the dimensions a = 14.780(1) A, b = 24.888(2) A, and c = 27.291(2) A. In the presence of barium ions, the precursor complexes L12Ni and L22Ni change their configurations from trans to cis so as to offer a polyoxygenated coordination site to a barium ion and assemble themselves around that ion to yield bimetallic species. Structural analogies with the polyether complexes of barium are discussed. Solution studies point to a great sensitivity of 2 to the nature of the solvent, contrary to (L12Ni)2Ba(ClO4)2·2H2O (1). Indeed, an important dissociation is induced by solvents which display good donor properties and which are able to st... |
| Databáze: | OpenAIRE |
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