Methyl- and methoxy-substituted di[1,4]benzodithiio[2,3-b:2,3-e]pyridines as new electron donor compounds: synthesis, molecular structure, electrochemical properties, and EPR studies
Mono-oxo-bis-dithioveratrol-molybdate - in Solution a Model for Arsenite Oxidase and in the Solid State a Coordination Polymer with Unprecedented Binding Motifs
of the analogous tungstencomplex. The title complex is a structural model for molybdopterin bearing arsenite oxidase and both complexes catalyze oxo-transfer reactions successfully to 100 % conversion. With the dithioveratrol ligand the oxidation of triphenylphosphine proved to be faster for the tungstencomplex, which is untypical. The solid-state structure of the molybdenumcomplex exhibits an unexpected
Tungsten's redox potential is more temperature sensitive than that of molybdenum
作者:Alexander Döring、Carola Schulzke
DOI:10.1039/c000489h
日期:——
The redoxpotentials of strictly analogous complexes of molybdenum and tungsten were studied using temperature dependent electrochemistry in order to evaluate a proposed influence of the potentials on the use of tungsten at thermophilic conditions and the use of molybdenum at mesophilic conditions in the molybdopterin dependent oxido reductases. Each pair of molybdenum and tungsten compounds was studied
Catalytic Disproportionation of Hydrazine Promoted by Biomimetic Diiron Complexes with Benzene‐1,2‐Dithiolate Bridge Modified by Different Substituents
disproportionation of hydrazine to ammonia and dinitrogen, wherein the complex with the most negative reduction potential induced by strong electron‐donating NMe2 group exhibits the best catalyticactivity. This result bodes well for efficient catalyst design for N–N bond cleavage of hydrazine. In addition, a well‐defined diiron diazene complex can be independently synthesized and also catalyze the hydrazine
Lowe, Nigel D.; Garner, C. David, Journal of the Chemical Society, Dalton Transactions, 1993, p. 2197 - 2208
作者:Lowe, Nigel D.、Garner, C. David
DOI:——
日期:——
Preparation and Electronic Structure of Substituted Aromatic Dithiolene Complexes of Gold(III)
作者:N. C. Schiodt、P. Sommer-Larsen、T. Bjornholm、M. Folmer Nielsen、J. Larsen、K. Bechgaard
DOI:10.1021/ic00118a016
日期:1995.7
Ab initio calculations on the complex ion bis(benzene-1,2-dithiolato)aurate(III), I, have been performed and show that the two highest occupied MO's have pi-character and correspond to the symmetric and antisymmetric combination of the pure ligand HOMO's with only a very small contribution from gold orbitals. Both ligand and metal orbitals contribute significantly to the LUMO which has sigma-character. A series of 10 derivatives of I have been prepared and isolated as tetra-n-butylammonium salts. The electronic spectra of these species show two symmetry-forbidden transitions in good agreement with calculations. A spectrochemical series is proposed and related to the electron-releasing efficiency of the substituents. Comparison of the potentials for the reversible oxidation of the complexes (measured by cyclic voltammetry) with the energy of the lowest lying electronic transition reveals a linear relationship which is discussed in terms of the degree of charge transfer from ligands to metal. Improved synthesis of some of the ligands is reported.