New coordination polymers based on the triangular [Cu3(l3-OH)(l-pz)3]2+ unit and unsaturated carboxylates

By reacting copper(II) acrylate with pyrazole (Hpz), two trinuclear copper derivatives [Cu3(m3-OH)- (m-pz)3(CH2=CHCOO)2(H2O)2(Hpz)], 1, and [Cu3(m3-OH)(m-pz)3(CH2=CHCOO)2(CH3OH)], 2, are obtained, in water and methanol respectively, while copper(II) methacrylate affords [Cu3(m3-OH)(m-pz)3(CH2=C(CH3)COO)2], 3, independently from the solvent used. In 1 and 2 two triangular trinuclear units are connected through acrylate bridges forming hexanuclear clusters that, in the case of 2 are further connected through double syn–syn carboxylate bridges, generating a 1-D coordination polymer. In the case of 3 a different 1-D coordination polymer is obtained by alternating syn–syn and syn–anti double carboxylate bridges connecting the trinuclear clusters. In all cases H-bonds contribute both to the stabilization of these arrangements and to the formation of more extended supramolecular networks. Compounds 1–3 are valuable catalysts in the peroxidative oxidation with aqueous H2O2, inMeCN at 25 &...