Preparation, separation and characterisation of two regioisomers of a N-hydroxyalkylpyridylpyrazole ligand: A structural investigation of their coordination to Pd(II), Pt(II) and Zn(II) centres

► Preparation and separation of two regioisomers. ► Formation Zn(II), Pd(II) and Pt(II) coordination complexes. ► Tetracoordinated species for Pd(II) and Pt(II) complexes. ► Penta or tetracoordinated species for Zn(II) complexes.