Dear Faisal,
When scrutinising such distances do be aware of the possibility of false precision in the estimates; see eg http://dx.doi.org/10.1107/S2052252513031485
Best wishes,
John
Prof John R Helliwell DSc
On 17 Apr 2014, at 21:13, Faisal Tarique <[log in to unmask]> wrote:
> Dear all
>
> Can anybody please explain what is the classical metal ion coordination for Mg2+, Ca+ and Na+ with Oxygen atom and the average distance with these metal ions..does the distance vary with the type of metal ion and its coordination with oxygen atom..what is the best way to identify the correct metal ion in the electron density in the vicinity of negatively charged molecule mostly oxygen containing molecule..In one of my paper the reviewer has asked me to check whether the octahedrally coordinated Mg+ is Ca+ ion..and similarly raised doubt about the identity of the Na+ ion as well..his argument was based on metal ion to oxygen distance..I am attaching the figure with this mail..i request you to please shed some light on this area and help me in clearing some doubts regarding this.
>
> --
> Regards
>
> Faisal
> School of Life Sciences
> JNU
>
> <Fig3.tif>
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