Abstract
Investigation on the aqueous coordination chemistry of nitrilotriacetato molybdate (VI) resulted in the isolation of molybdenum(VI) nitrilotriacetato complexes Na 6 n {[Mo 2O 5(ntaH) 2][(nta) 2Mo 2O 5]} n · 12 nH 2O ( 1) and (NH 4) 3 n [Mo 2O 5H(nta) 2] n · 4 nH 2O ( 2) (H 3nta = nitrilotriacetic acid). The complexes have been characterized by elemental analyses, IR, NMR spectroscopies and X-ray structural analyses. The anions of complexes 1 and 2 contain a linear (O 2Mo)O(MoO 2) core with the bridging oxo group lying at a center of symmetry. Each molybdenum atom is octahedrally coordinated by two terminal oxo groups, a bridging oxygen and a tridentate nitrilotriacetate ligand, which binds through the nitrogen atom and two μ-O carboxylates, while the other carboxylate remains free. Strong hydrogen bonds are found to exist in the two complexes. This is supported by IR and NMR spectra, and revealed by single crystal X-ray analysis. The complexes 1 and 2 show obvious decomposition in solution based on 13C NMR observations.
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