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Three pyrazole-based pyridine ligands, 2-(3-butyl-1H-pyrazol-5-yl)pyridine (1), 2-[3-(tert-butyl)-1H-pyrazol-5-yl]pyridine (2) and 2-(3-octyl-1H-pyrazol-5-yl)pyridine (3) were synthesised and fully characterised using conventional means. We then carried out a comprehensive solvent-extraction study of Ni II and Cu II in the presence and absence of a synergist (sodium p-dodecylbenzenesulfonate). The solvent extraction of only Ni II in the presence of a synergist produced extraction values between 72 and 73 %. The competitive extraction of Ni II and Cu II from a base-metal ion mix (Co 2+ , Ni 2+ , Zn 2+ , Cu 2+ , Pb 2+ and Cd 2+ ) produced extraction values of 85-90 % extraction of Cu II for two ligands without synergists and values for Cu II and Ni II [a] Based on the above, we set out firstly to synthesise the three pyrazole-based pyridine ligands (see Scheme 1 for ligand struc-

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