I am doing metal complex synthesis with various 3d metals. In that i would like to choose best metal complex for Cylic voltameter studies. Some time copper complex also didnt shows good Oxdiation and reduction peaks. So only i request through this question.
Unfortunately, the question itself, as well as the attempt to plan the experiment, seems to be entirely incorrect.
Different metals will give you different CV curves, since they have different nature, different stable oxidation states. The CV also depends on the solvent, ligand environment etc, but there are no "better" or "worse" metals - they are just different. Tell what are you going to do (what is the reason you want to do e-chem studies).
CV shows redox behavior of the metal complexes as well as ligands. Although Zn(II) is redox inactive while other 3d metals such as Ni(II), Cu(II), Co(II) show variable oxidation state and reveal good CV curve either in reduction or oxidation window. Further the ligands also affect their redox properties.
In My Ph.D. work, i did various metal complexes with different metals. I would like to give one good CV related paper work. Now tell me, How to choose good metal complexes from different 3d metals?