Synthesis and complexation of macrocycles containing two pyrazolone sub-units

Abstract The synthesis and characterization of several Ru(II) complexes with acyclic and macrocyclic ligands containing tautomerizable OH and fixed OCH 3 5-pyrazolone heterocycles are described. From dipyrazolylmethane bidentate ligands L , Ru L (bpy) 2 (PF 6 ) 2 and Ru( L H + )(bpy) 2 PF 6 complexes have been obtained. From the macrocycle with two CH 3 and two OCH 3 pyrazole sub-units, a series of complexes Ru( Mac )XY(PF 6 ) 2 (X,Y = DMSO, CH 3 CN, Py, Pz, dmPz) has been prepared. They show a behavior close to that of the analogous tetrapyrazole complexes but with slightly different complexing ability. In the case of the corresponding di OH macrocycle, coordination with Ru(DMSO) 4 Cl 2 leads to unstable complexes.