Synthesis and crystal structures of mononuclear CuII/CoII coordination complexes from pyrazole-dicarboxylate acid derivatives

Three pyrazole-dicarboxylate acid derivatives were synthesized and characterized by 1H NMR and ESI-MS. Single crystal X-ray diffraction allowed to identify mononuclear chelate complexes [Cu(L1)2(H2O)]·2H2O (A) and [Co(L3)(H2O)2] (B), as well as L2. A and B consist of 2D H-bonded networks with and without lattice included water molecules, respectively.