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Program Solid-G

Solid-G is a PC program that allows fascile computation of ligand solid angles in organometallic compounds. The solid angles are converted to percentages (G-values) that illustrate the extent to which each ligand shields the central metal. In the second column there are three figures. The top one is the scheme of a Mg complex and the animated GIF below represents the steric behavior by the two ligands - each ligand and its shadow are assigned a color. The bottom figure demonstrates that Solid-G can handle quite complex compounds and measure steric interaction among ligands.

scheme

The program is free to use (at your own risk), but the paper by I.A.Guzei, M. Wendt.  Dalton Trans., 2006, 3991–3999 must be referenced.

The principles implemented in the program are described in
I.A.Guzei, M. Wendt.  Dalton Trans., 2006, 3991–3999.

The papers mentioning solid angle computations with Solid-G are
I.A. Guzei, R.W. McGaff, H.M. Kieler. Acta Crystallogr., C61, m472 (2005).
I.A. Guzei, M.E. Sanchez-Castro, A. Ramirez-Monroy, M. Cervantes-Vasquez, I.R.A. Figueroa, M.A. Paz-Sandoval. Inorg. Chim. Acta, 359, 701 (2006).
Fukin, Georgy K.; Guzei, Ilia A.; Baranov, Evgenii V.  J. Coord. Chem.  2007,  60(9),  937-944.

movie

The zip file contains all the info you need. 

Create
c:\SolidAngle\
directory and extract all the files into it.  Then run Solid-G.exe.  The instructions on how to use the program (quite simple really) are displayed via the "Manual" button. 

The file with extension .xyz is an example input file.

You can Open the xyz file and then go from one activated button to the next.  The blue progress bar can sometimes get stuck but the calculations will continue regardless.  In my experience the program has never hung during normal operation.  The input coordinates should be Cartesian rather than fractional. 

If you want a smooth picture in the visualizer (Start Viewer button) use
view->define bound sphere->granularity
 and set it to a multiple of 180.  900 works well. Then you can copy and paste pictures into other programs.

complex

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