Efficient catalysis of Knoevenagel condensation by 1D copper-containing heterpolyoxoniobate at room temperature

A 1D copper-containing organic-inorganic hybrid heterpolyoxoniobate, H3[K(H2O)6][K2(H2O)10]2[Cu(en)2(H2O)2][Cu(en)2(Nb6O19Cu(en))2]·24H2O (HPONb 1), has been synthesized to heterogeneously catalyze Knoevenagel condensation at room temperature with high yields and cyclic stability. The catalyst represents the...