PET is Wonderful Annual Meeting 2021 Oct 26, 2021 12:00 AM — Virtual Meeting (online)
NRS Mental Health Network Annual Scientific Meeting 2021 Nov 02, 2021 09:00 AM - 05:00 PM — Royal College of Physicians, Edinburgh (and online)


SINAPSE experts from around Scotland have developed ten online modules designed to explain medical imaging. They are freely available and are intended for non-specialists.

Edinburgh Imaging Academy at the University of Edinburgh offers the following online programmes through a virtual learning environment:

Neuroimaging for Research MSc/Dip/Cert

Imaging MSc/Dip/Cert

PET-MR Principles & Applications Cert

Applied Medical Image Analysis Cert

Online Short Courses

Electrochemical cleavage of N=N bonds at a Mo-2(mu-SMe)(3) site relevant to the biological reduction of dinitrogen at a bimetallic sulfur centre

Author(s): N. Le Grand, K. W. Muir, F. Y. Petillon, C. J. Pickett, P. Schollhammer, J. Talarmin

The reduction of diazene complexes [Mo2Cp2(mu-SMe)(3)(mu-eta(2)-H-N=N-R)](+) (R=Ph (3a); Me (3b)) and of the hydrazido(2-) derivative [Mo2Cp2(mu-SMe)(3){mu-eta(1)-N=N(Me)H}](+) (1b) has been studied by cyclic voltammetry, controlled-potential electrolysis, and coulometry in THE The electrochemical reduction of 3 a in the presence of acid leads to cleavage of the N=N bond and produces aniline and either the amido complex [Mo2Cp2(mu-SMe)(3)- (mu-NH2)] 4 or the ammine complex [Mo2Cp2(mu-SMe)(3)(NH3)(X)] 5, depending on the initial concentration of acid (HX = HTsO or CF3CO2H). The N=N bond of the methyldiazene analogue 3b is not cleaved under the same conditions. The ability of 3a but not 3b to undergo reductive cleavage of the N=N bond is attributed to electronic control of the strength of the Mo-N(R) bond by the R group. ne electrochemical reduction of the methylhydrazido(2-) compound 1b in the presence of HX also results in cleavage of the N=N bond, with formation of methylamine, 4 (or 5) and the methyldiazenido complex [Mo2Cp2(mu-SMe)(3)(mu-eta(1)-N=N-Me)]. Formation of the last of these complexes indicates that two mechanisms (N=N bond cleavage and possibly H-2 production) are operative. A pathway for the reduction of N-2 at a dinuclear site of FeMoco is proposed on the basis of these results.

Full version: Available here

Click the link to go to an external website with the full version of the paper

ISBN: 0947-6539
Publication Year: 2002
Periodical: Chemistry-a European Journal
Periodical Number: 14
Volume: 8
Pages: 3115-3127
Author Address: