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. **Unfortunately these do not currently work in browsers**

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

Silver(I) and mercury(II) complexes of Me3N(+)-N(-)X ylides: synthesis and structure

Author(s): D. G. Morris, K. W. Muir, C. O. W. Chii

The ligating properties of Me3N(+)-N(-)X trimethylammonio-stabilised nitrogen ylides have been investigated. The electron-rich nitrogen atom of the ylide can be attached to silver(I) and mercury(II), giving rise to new solids with unusual architectures. The mono-ylide complex LAgNO3 [L=Me3N(+)-N(-)C(O)C6H4Cl-p] contains chains in which LAg units are mu(2)-bridged through nitrate oxygen atoms, whereas the di-ylide species L2AgNO3 [L=Me3N(+)-N(-)SO2C6H4CH3-p] contains L2Ag units with nearly linear coordination (N-Ag-N 158degrees); if account is taken of weaker Ag...O interactions the crystal is built from discrete L2AgNO3 molecules containing chiral tris(chelate)silver(I) ions which have spontaneously resolved during crystallisation. The ylide L=Me3N(+)-N(-)CO2Me forms catena-[LHgCl2] in which the planar LHgCl2 sub-units are weakly linked into chains through Hg...Cl contacts of 3.12 Angstrom. Treatment of L=Me3N(+)-N(-)C(O)C6H4Cl-p with HgCl2 leads to hydrolysis and formation of [LH][Hg2Cl5] which contains a novel [Hg2Cl5-](infinity) sheet structure formed by 2:1 association of linear HgCl2 molecules with dinuclear Hg2Cl62- anions. (C) 2003 Elsevier Ltd. All rights reserved.

Full version: Available here

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

ISBN: 0277-5387
Publication Year: 2003
Periodical: Polyhedron
Periodical Number: 25-26
Volume: 22
Pages: 3345-3353
Author Address: