Wednesday
July 30, 2014

Homework Help: Coordination

Posted by Sheryl on Saturday, October 21, 2006 at 4:43pm.

Is coordination the same as ionic bonding?

Sheryl


As I understand coordination, as in coordination number, no. It is more covalent or more precisely called coordinate covalent if we are talking abouat the same thing.


Then I guess 'salt formation' would be referring to ionic bonding.

S


yes. For example, NH3 adds to HCl to form the NH3^+ and Cl^-. In the same way, N in organic compounds, (amines, NH2), adds to HCl to form the corresponding RCH2NH3^+ + Cl^-. Both of these are coordinate covalent bonds in that the two electrons shared came from the same atom. In these two cases they came from N with H^+ coming to them with no hydrogens of its own. The electron on H went to the chlorine atom to form the chloride ion.


I've been looking all over the internet to find something that goes into a little detail about column chromatography interactions between adsorbants like alumina and compounds being adsorbed. The interactions involved are: salt formation, coordination, h. bonding, d-d and vdw. I suppose I could wing it but I'd like to look at somethihg a little descriptive if possible.

Let me know if you can located something.

Thanks from Sheryl


Coordination, in this sense of the term may mean the formation of corrdinate complexes. Remember Cu^+2 forms the Cu(NH3)4^+2 complex ion. Sometimes the colums have something in them that form a complex of this type. But I will look and post here if I find something.


The three sites below are the only ones I could find and they don't go into a lot of detail. I think I have sent two of them to you before when you were asking questions about TLC. You can go to www.google.com and type in column chromatography or thin layer chromatography or try something like adsorbants on the end or theory on the end.
http://orgchem.colorado.edu/hndbksupport/colchrom/colchrom.html
http://orgchem.colorado.edu/hndbksupport/chrom.html
http://lifesciences.asu.edu/resources/mamajis/chromatography/chromatography.html

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