I prepared copper complexes Br derivative trigonal pipyramidal and Ome derivative square plannar geomentry in solid state. But My question is in liquid state monodentate or bidentate or tridentate. How will confirm this.
Do you think to be dissolved state as liquid state? Are the Br and OMe on your ligand or bound to the Cu ? If these are in your ligand, I think, IR and Raman spectroscopy will give the first information (stretching shifts) about coordination mode of your ligand.
If you want to determine if the complex structure in solution is roughly the same as in the solid state you could maybe do mass spectroscopy to check what complexes you have in solution. Also, assuming you have Cu(II) complexes, you could do EPR in solid powdered samples and solution. If you have approximately the same EPR parameters in both cases the structure is probably maintained. Keep in mind that in the solid state inter molecular magnetic interactions cause a series of broadenings AND narrowings of signals making it harder to extract the isolated complexes EPR parameters.
Dear Nicolas,
What are reasons for following cases:
1. Explain the inter molecular magnetic interactions.
2. If solid state & liquid state EPR are same.
3. If solid state & liquid state EPR are different.
4. Say important factor to differentiate in solid or liquid state.
Dear Raj, It is not easy to explain all possible situations. Magnetic interactions always occur between paramagnetic sites. There are several causes of those interactions, but generally, if two paramagnets are close (a few angstrom) it is very likely that there is an exchange interaction, at there will always be a magnetic dipolar interaction. In a diluted solution the paramagnets are far apart and so these magnetic interactions may be negligible. If you can determine the g-tensor of the metal atom (e.g. copper) in solid state and solution, and they are sufficiently similar, the structures are likely to be similar. If you can observe hyperfine splitting in both cases, and the A-tensor parameters are sufficiently similar, it is also a very strong suggestion of structural similarity. But if the spectra look different, there are many reasons for which these could be so, and not necessarily the complex structures have to be different. Two good books with general EPR theory and examples which can help you to interpret experimental data are Wilfred Hagen's book "Biomolecular EPR spectroscopy" and Weil and Bolton's "Electron Paramagnetic Resonance: Elementary Theory and Practical Applications".
I hope this helps
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