Synthesis of new bulky bis(pyrazolyl)methane carboxylate (heteroscorpionate) ligands and their complexes with iron, manganese and nickelElectronic supplementary information (ESI) available: The Supplementary Information contains thermal ellipsoid plots of all of the X-ray structures, the cif of the X-ray structures, the Slant Fourier map of the iron-aquo environment indicating the electron density attributed to the protons of the aquo ligand and a histogram of the Fe-OR2 (ether) distances from t

• Main Authors: Jones, Michael W, Baldwin, Jack E, Cowley, Andrew R, Dilworth, Jonathan R, Karpov, Alexei, Smiljanic, Nicolas, Thompson, Amber L, Adlington, Robert M
• Format: Article
• Language: English
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c2dt31859h

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. Sterically demanding ligands based on the bispyrazolylacetic acid motif have been prepared and the coordination chemistry with Fe( ii ), Fe( iii ), Ni( ii ) and Mn( ii ) has been investigated.