| 16234939 |
Thapper A, Behrens A, Fryxelius J, Johansson MH, Prestopino F, Czaun M, Rehder D, Nordlander E: Synthesis and characterization of molybdenum oxo complexes of two tripodal ligands: reactivity studies of a functional model for molybdenum oxotransferases. Dalton Trans. 2005 Nov 7;(21):3566-71. Epub 2005 Sep 16.
Reaction of the tetradentate ligand N-(2-hydroxybenzyl)-N,N-bis (2-pyridylmethyl) amine (L-OH) with MoO2Cl2 in methanol in the presence of NaOMe and PF6- results in the formation of [MoO2 (L-O)] PF6. Similarly, the reaction of N-(2-mercaptobenzyl)-N,N-bis (2-pyridylmethyl) amine (L-SH) with MoO2 (acac) 2 leads to the formation of [MoO2 (L-S)]+. The dioxo-molybdenum complex [MoO2 (L-O)]+ reacts with phosphines in methanol to afford phosphine oxides and an air-sensitive molybdenum complex, tentatively identified as [Mo (IV) O (L-O)(OCH3)]. The latter complex is capable of reducing biological oxygen donors such as DMSO or nitrate, thereby mimicking the activity of DMSO reductase and nitrate reductase. Reaction of [MoO2 (L-O)] PF6 with PPh3 in other solvents than methanol leads to the formation of the Mo (V) dimer [(L-O) OMo (micro-O) MoO (L-O)](PF6) 2. The crystal structures of [MoO2 (L-O)] PF6 and the micro-oxo bridged dimer are presented. |
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