A novel 2D zinc metal–organic framework: Synthesis, structural characterization and vibrational spectroscopic studies

The crystal structure and vibrational spectra of a new Zn(II) terephthalate 2D metal–organic framework, [Zn3(tp)3(DMSO)2)]n (H2tp = terephthalic acid; DMSO = dimethyl sulfoxide), together with its thermal behavior and photoluminescence properties have been studied. The structure shows a rare layered structure with 6-connected hxl topology, constructed from trinuclear [Zn3C14H8O14S2] units, and crystallizes in the monoclinic system, space group P21/c (No. 14). The asymmetric units consist of two crystallographically independent Zn(II) ions, one and a half tp ligands and one disordered DMSO molecule. One of the Zn(II) ions adopts a disordered tetrahedral geometry, coordinated by four O atoms from three different tp ligands and one terminal disordered DMSO ligand, while the other is surrounded by six oxygen atoms from six tp ligands to form an octahedral geometry configuration. The tp2− ligands act as μ4-bridges linking four Zn(II) centers through different coordination modes. IR and Raman vibrational spectra were recorded and the full assignment of the vibrational frequencies is proposed.

A rare layered Zn(II) terephthalate metal–organic framework with 6-connected hxl topology, stacking along the a axis in an eclipsed arrangement giving shape to triangular channels.Figure optionsDownload as PowerPoint slideHighlights
► A 2D Zn(II) terephthalate metal–organic framework has been prepared.
► The structure shows rare layered structure with 6-connected hxl topology.
► The vibrational properties were studied by Raman and infrared spectroscopy.
► Thermal gravimetric analysis together with photoluminescence properties have been discussed in detail.