Redox-Chemie einfach arsenverbriickter Zweikernkomplexe ohne Metall-Metall-Bindung /Redox Chemistry of Singly Arsenic Bridged Dinuclear Complexes without Metal-Metal Bonds

1979 ◽  
Vol 34 (9) ◽  
pp. 1195-1198 ◽  
Author(s):  
Thomas Madach ◽  
Heinrich Vahrenkamp
Keyword(s):  
Metal Carbonyl ◽  
Chemical Oxidation ◽  
Redox Process ◽  
Dinuclear Complexes ◽  
Carbonyl Complexes ◽  
Metal Carbonyl Complexes ◽  
Metal Metal ◽  
Metal Metal Bonds ◽  
Electron Transfers ◽  
Metal Bonds

The oxidations and reductions of 27 singly arsenic bridged dinuclear metal carbonyl complexes were investigated. There are indications that the complexes as a whole are involved in the redox process. However, the expected one and two electron oxidations with concomitant formation of metal-metal bonds were not observed. Electrochemical electron transfers were irreversible. Chemical oxidation and reduction of a selected example resulted in a series of products originating from the primary fission of one metal-arsenic bond.

Paramagnetic organometallic molecules. XV. Electron attachment reactions of metal carbonyls

1983 ◽  
Vol 36 (3) ◽  
pp. 613 ◽  
Author(s):  
AS Huffadine ◽  
BM Peake ◽  
BH Robinson ◽  
J Simpson
Keyword(s):  
Metal Carbonyl ◽  
Electron Attachment ◽  
Metal Carbonyls ◽  
Carbonyl Complexes ◽  
Metal Carbonyl Complexes ◽  
Metal Metal ◽  
Organometallic Molecules ◽  
Metal Metal Bonds ◽  
Metal Bonds

A number of polynuclear metal carbonyl complexes can be used as substrates for electron attachment reactions induced by the photoionization of N,N,N',N'-tetramethyl-p-phenylenediamine. Theproducts of such reactions are derived from metal carbonyl radicals produced by cleavage of the metal-metal bonds.

Elektrochemische und elektronenspektroskopische Messungen zur Natur einfach arsenverbriickter Metall-Metall-Bindungen/Electrochemical and Electron Spectroscopic Measurements on the Nature of Singly Arsenic Bridged Metal-Metal Bonds

1979 ◽  
Vol 34 (9) ◽  
pp. 1190-1194 ◽  
Author(s):  
Ute Honrath ◽  
Heimich Vahrenkamp
Keyword(s):  
Metal Carbonyl ◽  
Atomic Weight ◽  
Relative Strength ◽  
Phosphine Ligands ◽  
Redox Potentials ◽  
Carbonyl Complexes ◽  
Reduction Potentials ◽  
Metal Metal ◽  
Metal Metal Bonds ◽  
Metal Bonds

For a series of singly arsenic bridged dinuclear metal carbonyl complexes with metal-metal bonds electronic spectra and dc-voltammograms in 1,2-dichloroethane were recorded. There is a reasonable correlation between the σ→σ* transitions and the first reduction potentials which can both be taken as measures of the relative strength of the metal-metal bonds. The σ→σ* excitation energy and the negative reduction potential increase (a) with increasing atomic weight of the connected metal atoms, (b) with in­creasing number of CO groups present, (c) with decreasing intramolecular steric hindrance. Steric and electronic factors cannot be cleanly separated. There seems to be no correlation with metal-metal bond lengths. Terminal phosphine ligands decrease all redox potentials but hardly change the electronic absorptions.

Zur Reaktivität von Natrium-bis-trimethylsilylamid gegenüber Metallcarbonylkomplexen mit Metall-Metall-Bindungen, I ER2-verbrückte Dicyano- und Diisonitril-octacarbonyl-dimanganate (E = Sn, Pb) / The Reactivity of Sodium Bis-trimethylsilylamide against Metal Carbonyl Complexes with Metal Metal Bonds, I ER2 Bridged Dicyano or Diisonitrile Octacarbonyl Dim anganates (E = Sn, Pb)

1986 ◽  
Vol 41 (5) ◽  
pp. 606-616 ◽  
Author(s):  
Matthias Moll ◽  
Helmut Behrens ◽  
Peter Merbach ◽  
Karl-Heinz Trümmer ◽  
Gerhard Thiele ◽  
...  
Keyword(s):  
Structure Analysis ◽  
Vibrational Spectra ◽  
Mass Spectra ◽  
Metal Carbonyl ◽  
Carbonyl Complexes ◽  
X Ray ◽  
Metal Carbonyl Complexes ◽  
Metal Metal ◽  
New Compounds ◽  
Metal Bonds

Abstract EPh2 bridged dicyano octacarbonyl dimetalates {Ph2E[Mn(CO)4CN]2}2- are formed by the reaction of bis(carbonyl-metalates) of tin and lead Ph2E[Mn(CO)5]2 with NaN(SiMe3)2. The new dicyano anions can be transformed with trialkyloxonium tetrafluoroborates [R′3O]BF4 or chlor-trimethylsilane and -germane into the corresponding diisonitrile complexes Ph2E[Mn(CO)4CNR′]2 (R′=Me, Et, SiMe3, GeMe3). In the case of Ph2E [Mn(CO)4CNR′]2 (R′=Me, Et; E=Sn, Pb) the two phenyl groups can be removed with dry hydrogenchloride to give Cl2E[Mn(CO)4CNR′]2.NMR and mass spectra are discussed. The vibrational spectra of the new compounds show cis-coordination of the Sn atoms and the cyano or isonitrile ligands in the carbonylmetalate fragments. This is confirmed by the X-ray structure analysis of Ph2Sn[Mn(CO)4CNMe]2 (space group P21/n).

Fourier transform infrared and Raman study of metal carbonyl clusters: distinction of covalent and dative metal-metal bonds

1994 ◽  
Author(s):  
Steven M. Barnett ◽  
Stephane H. Brienne ◽  
Ian S. Butler ◽  
Frederick W. Einstein ◽  
Mike C. Jennings ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Metal Carbonyl ◽  
Fourier Transform Infrared ◽  
Carbonyl Clusters ◽  
Metal Metal ◽  
Metal Carbonyl Clusters ◽  
Raman Study ◽  
Metal Metal Bonds ◽  
Metal Bonds
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