New copper(II) complexes containing 2-furoic hydrazide and 5-nitro-2-furoic hydrazide ligands: synthesis, thermal, magnetic and spectroscopic characterization - Fontes, Ana Paula Soares; Guerra, Wendell; Machado, Flávia Cavalieri; Almeida, Mauro Vieira de; Alves, Wendel Andrade; Ferreira, Maria da Costa; Paduan-Filho, Armando (Transition Metal Chemistry, 2004)