New complexes of nickel and nickel/cobalt with tetrahydrofuran-2,3,4,5-tetracarboxylic acid, THF(COOH)4. Crystal structures of Ni[THF(COOH)2(COOH)2](H2O)3 and Ni0.7Co0.3[THF(COOH)2(COO)2](H2O)3·H2O and their thermal behaviour | Publicación