New Supramolecular Networks Based on Paratungstate with N-Donor Bridging Ligands

Three new supramolecular networks based on paratungstate and N-donor bridging ligands, H₂bpmp]_2.5HH₂W₁₂O₄₀]2H₂O(1), H₂(bpp)]₂H(py―CH₃)]_0.25H(py―C₂H₅)]_0.25H_1.5H₂W₁₂O₄₀]·4H₂O(2) and H₂pip]₃H₂W₁₂O₄₀](3)bpmp=N,N'-bis(4-pyridylmethyl)piperazine; bpp=1,3-bis(4-pyridyl)propane; py=pyridine; pip=piperazine] were prepared by the hydrothermal synthesis and characterized by elemental analysis, infrared(IR), thermogravimetric(TG) analysis and single-crystal X-ray diffraction(XRD). All the compounds show high-dimen- sional supramolecular networks based on H₂W₁₂O₄₀]^6- and the protonated N-donor ligands via the N―H···O―W hydrogen bonds and/or π···π stacking interactions. Their luminescent properties were investigated.