Experiment 5.2 Visible Spectroscopy of Tris bidentate

1 Why is [Co(ox)]33 sensitive to light and heat and the other complexes not Q5.2 Note the colors of all four cobalt complexes prepared in the lab. Provide an explanation for this. 

3 All four syntheses begin with a cobalt(II) salt, which after addition of appropriate ligands, is oxidized to the cobalt(III) product. Why is this done this way  

4 Only [Co(en)3]3+ is prepared by aerial oxidation (02) while the other procedures use Pb(IV)02. Offer an explanation for this. 

5 If the pH is too low during the synthesis or work-up of your metal complexes, what complications can arise  

EXPERIMENT 5.2 VISIBLE SPECTROSCOPY OF TRIS(BIDENTATE CHELATE)COBALT(III) COMPLEXES 

---