Two hybrid polyoxometalate-pillared metal–organic frameworks

Abstract

Two polyoxometalate-pillared 3D compounds, {Cu₅(2-ptz)₆(H₂O)₄(SiW₁₂O₄₀)}·4H₂O 1 and {Cu₉(2-ptz)₁₂(H₂O)₆(PMo₁₂O₄₀)₂}·H₂O 2 (2-ptz = 5-(2-pyridyl)tetrazole) have been constructed based on different polyoxometalate anions, and copper–organic coordination polymer sheets by a hydrothermal method. Magnetic investigations reveal that both 1 and 2 exhibit antiferromagnetic coupling between the Cu^II ions. Structural studies show the compound 1 exhibits a typical pcu-type net with the Schälfli symbol of {4¹²·6³}, and that compound 2 is a (3,4,6)-connected framework with novel {4⁴·6¹⁰·10}{6³}₂{6⁵·8} topology which has not been reported to date.