pH Dependent formations of dinuclear molybdenum(V) and incomplete cubane molybdenum(IV) complexes with nitrilotriacetate |
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| Authors: | Zhao-Hui Zhou Qin Xu Jin Lin Seik-Weng Ng |
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| Affiliation: | aDepartment of Chemistry, College of Chemistry and Chemical Engineering and State Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China;bDepartment of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia |
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| Abstract: | Nitrilotriacetato oxomolybdenum(V) dinuclear complex (NH4)4cis-Mo2O4(nta)2] · 7H2O (1) (H3nta = nitrilotriacetic acid) and its incomplete cubane-type trinuclear molybdenum(IV) complex Mo3O(OH)3(Hnta)3] · Cl · 3H2O (2) are isolated in a weak acidic and an acidic solutions, respectively (pH 4.5 and 1.0). The nitrilotriacetate ligand in the anion 1 or the cation 2 displays tridentate mode through the nitrogen atom and the oxygen atoms of β-carboxy groups. Unusual protonations of bridged oxygen atoms in 2 have not effect on the skeleton of molybdenum(IV) cap Mo3O unit. There are obvious dissociations of molybdenum(V) complexes based on 13C NMR observations in solution. |
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| Keywords: | Molybdate Nitrilotriacetate Incomplete cubane cluster Crystal structure |
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