Scheme 1. Synthesis of Ligands 1–4 and Complexes 5–16; Reagents and Conditions: (a) HOCH₂CH₂OH, H₂SO₄, 85 °C, 1 h; (b) H₂NCH₂CH₂NH₂, CDI, THF, 18 h; (c) HC(pz)₂COOH or HC(3,5-Me₂pz)₂COOH, DMAP, EDCI·HCl,16 h; (d) HC(pz)₂COOH or HC(3,5-Me₂pz)₂COOH, HOBT, EDCI·HCl, DMF, 16 h; (e) PTA, Cu(CH₃CN)₄PF₆, CH₃CN, Overnight; (f) PPh₃, Cu(CH₃CN)₄PF₆, CH₃CN, Overnight; and (g) CuCl₂·2H₂O, CH₃CN, 24 h.