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Three new sterically demanding ligands based on the bispyrazolylacetic acid motif have been prepared and complexes with Fe(II), Fe(III), Ni(II) and Mn(II) have been synthesised and characterised. Single crystal X-ray structures are included for two of the ligands in the protonated form and ten other complexes. Additionally, a new general route to amide derivatives has been established, a range of amide derivatives synthesised and their coordination chemistry investigated. Only one metal complex was synthesised from the amide ligands, and was bound via the hydroxylamine groups in preference to the pyrazole and carboxylate donor set.
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