Interactions of vanadium with amino acids—Monodentate coordination of vanadyl proline, lysine and histidine and catalytic degradations of methyl orange. (1st February 2019) - Deng, Lan
Graphical abstract: Vanadium amino acids have been obtained in acidic conditions. Proline, lysine and histidine feature monodentate coordination with vanadium by carboxy groups respectively.1 and2 show good catalytic activities for the degradations of methyl orange (MO) with H2 O2 . Abstract: Vanadyl proline [VO(Hpro)(SO4 )(H2 O)3 ] (1, Hpro = proline), lysine trans -[VO(H2 lys)2 (H2 O)3 ]Cl4 ·H2 O (2, Hlys = lysine) and histidine [VO(H2 his)(2, 2′-bipy)(H2 O)2 ]Cl3 ·H2 O (3, Hhis = histidine) have been obtained in acidic conditions. Proline, lysine and histidine in1 –3 feature monodentate coordination with vanadium(IV) through carboxy groups respectively. The complexes are well characterized by elemental analysis, UV–Vis, IR, EPR, TG, X-ray structural analyses and bond valence calculations (BVS). The interactions between vanadium and amino acids are compared between1 –3 and other similar transition metal amino acids. Solution NMR spectra show the coordination of amino acids in solution. Moreover, 1 and2 show good catalytic activities for the degradations of methyl orange (MO) with H2 O2 .