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.