Metal Complexes of an Oxatriaza Macrocycle Containing Pyridine: Thermodynamic Stability and Structural Studies

19 Coordination chemistry of macrocyclic ligands

“…The synthesis, protonation constants and coordination chemistry of the pyridine containing ligand L 180 have been reported. 142 The stability constants for Mn II , Fe II , Co II , Ni II , Cu II , Zn II , Cd II and Pb II with L 180 were found to occur in the same sequence as that obtained for the saturated isoleptic ligand L 181 .…”

A new pyridine-based 12-membered macrocycle functionalised with different fluorescent subunits; coordination chemistry towards CuII, ZnII, CdII, HgII, and PbII

“…2.0 and 2.5 log units, respectively, against 1.5 log units in the case of studied in order to evaluate the effects of the macrocyclic cavity size and conformational rigidity conferred by the heterocyclic fragment, on the metal ion complexation selectivity. [31][32][33] Far less work has been done on tetradentate pyridine-based 12-, or 14-membered macrocycles containing S-donors. NS 3 -, and NS 2 O-donor ligands of this type have been studied 34,35 and successfully used as neutral carriers for the construction of ion-selective membrane electrodes, 36 and liquid-liquid extraction of heavy metal ions; 37 in contrast, no pyridine-based 12-, or 14-membered N 4−x S x -donor macrocycles (x = 1-3) are known.…”

Metal complexes of dipyridine hexaaza macrocycles. Structural differences between 18- and 20-membered macrocycles on complexation

“…Metal ion solutions were prepared at concentrations of about 0.025 mol dm Ϫ3 from the nitrate salts of the metals (analytical grade) with demineralised water (obtained by a Millipore/Milli-Q system) and were standardised as described. 26,32 Carbonate-free solutions of the titrant, KOH, were obtained, maintained and discarded as described. 26,32 Equipment and work conditions.…”

“…26,32 Carbonate-free solutions of the titrant, KOH, were obtained, maintained and discarded as described. 26,32 Equipment and work conditions. The equipment used was described previously.…”

“…The equipment used was described previously. 26, 32 The temperature was kept at 25.0 ± 0.1 ЊC; atmospheric CO 2 was excluded from the cell during the titration by passing purified nitrogen across the top of the experimental solution in the reaction cell. The ionic strength of the solutions was kept at 0.10 mol dm Ϫ3 with KNO 3 .…”