Question 1: The structures of five potential ligands for transition elements are shown below: NHME il NH2 pentane-2,4-dione Ligand 1 (Z)-Nl-methylethene-1,2-diamine Ligand 2 thiophene Ligand 3 S SH Mes NH2 SH 2-(1-aminopropan-2-yl)thio)ethane-1-thiol Ligand 4 4-([4-(methylthio)butylamino)butane-1-thiol Ligand 5 (a) Identify the potential coordinating groups in ligands 1 to 5 above and give their denticity i.e. whether they are monodentate, didentate (bidentate), tridentate etc. (b) Two of the ligands above will NOT act as chelating agents. Which are these? Explain your answer in each case. (c) Draw the structure of the 1:2 M4*:ligand complex for each of the three chelating ligands above where M4+ is a 1st row transition element. Indicate the overall charge on each of the structures you have drawn, name the shape of each complex, and justify the shape you have chosen. (d) Comment on the affinities of each of the three chelating ligands above for the following metal ions: Cu2+, Hg2+, Co3+