Synthesis and crystal structure of Cu(II) and Co(II) complexes with 1,3-dimethyl-pyrazole-5-carboxylic acid ligand

In the reaction of 1,3-dimethyl-pyrazole-5-carboxylic acid (HL) with M(OAc)2•4H2O, (M = Cu, Co) two novel complexes have been prepared, square-planar [CuL2(H2O)2] and octahedral [CoL2(MeOH)4]. The crystal structures have been determined by single-crystal X-ray diffraction. In both complexes the deprotonated acid displays monodentate coordination to the metal ions. According to the results of CSD survey this is the first structural report on the metal complexes with N1-substituted pyrazole-5-carboxylic ligand. [Projekat Ministarstva nauke Republike Srbije, br. 172014 i br. 172035]