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
Here are three sources that you can refer to for more information on column chromatography interactions between adsorbents like alumina and compounds being adsorbed:
1. The first source is a handbook support on column chromatography from the University of Colorado. It provides an overview of the theory and techniques used in column chromatography: http://orgchem.colorado.edu/hndbksupport/colchrom/colchrom.html
2. The second source is also from the University of Colorado and provides general information on chromatography methods, including column chromatography: http://orgchem.colorado.edu/hndbksupport/chrom.html
3. The third source is from Arizona State University and offers resources on chromatography, including basic principles and techniques: http://lifesciences.asu.edu/resources/mamajis/chromatography/chromatography.html
These sources may not provide an extensive level of detail on the specific interactions involved in column chromatography, such as salt formation, coordination, hydrogen bonding, d-d interactions, and van der Waals forces. However, they can give you a general understanding of the techniques and principles involved.