Interaction of Desferrioxamine B (Dfb) Model Dihydroxamic Acids with Some Essential and Toxic Metal(Ii) Ions: Effects of the Structure and Length of Connecting Chains on the Metal Ion Selectivityelectronic Supplementary Information (Esi) Available: Fig. S1: 1H Nmr and 13C?1H Cosy Nmr Spectra Recorded for 2,5-Diha. Fig. S2: 1H Nmr Spectra Recorded for (A) 3,4-Diha and (B) Pb(Ii)?3,4-Diha as a Function of Ph at 1 ? 2 Metal to Ligand Ratio. Fig. S3: Some Uv-Vis Spectra Recorded for Cu(Ii)?2,5-Diha as a Function of Ph at 1 ? 2 Metal to Ligand Ratio. Fig. S4: Some Uv-Vis Spectra Recorded for Ni(Ii)?2,2-Diha as a Function of Ph at 1 ? 2 Metal to Ligand Ratio. Fig. S5: Concentration Distribution Curves Calculated for Pb(Ii)?2,5-Diha and Pb(Ii)?2,2-Diha at 1 ? 2 Metal to Ligand Ratio. See Http://Www.rsc.org/Suppdata/Dt/B4/B401426J/