Molybdenum(VI) complex with citric acid: synthesis and structural characterization of 1:1 ratio citrato molybdate K2Na4[(MoO2)2(cit)2]·5H2O
1997; Elsevier BV; Volume: 16; Issue: 1 Linguagem: Inglês
10.1016/0277-5387(96)00260-4
ISSN1873-3719
AutoresZhao‐Hui Zhou, Huilin Wan, Khi-Rui Tsai,
Tópico(s)Asymmetric Hydrogenation and Catalysis
ResumoSodium potassium citrato molybdate K2Na4[(MoO2)2O(cit)2]·5H2O has been prepared by the reaction of potassium trihydrogen citrate and sodium molybdate. Analysis of the crystal structure reveals that the anion of the complex contains a bent (MoO2)O(MoO2) core with an MoOMo angle 142°. Each molybdenum has a distorted octahedral coordination and citrato ligands are tridentate to the two molybdenum atoms via the deprotonated hydroxy-, α- and β-carboxyl groups. Principal dimensions are: [MoO(t)]av, 1.706(4); [MoO(b)]av, 1.899(3); [MoO(hydroxy)]av, 1.944(3); [Mo Oα-carboxyl)]av, 2.207(3), and [MoO(β-carboxyl)]av, 2.264(3) Å. The IR, 1H and 13C NMR spectra are in agreement with this structure.
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