title: Mixed-ligand Zn-MOFs for highly luminescent sensing of nitro compounds.
abstract: Three Zn(II) metal-organic frameworks (Zn-MOFs), [Zn2(tib)(HL(1))(H2L(1))0.5]·2H2O (1), [Zn2(tib)(L(2))]·H2O (2) and [Zn3(tib)(L(3))2(H2O)6]·2 H2O (3), have been prepared by reactions of 1,3,5-tris(1-imidazolyl)benzene (tib), and biphenyl-3,3',4,4'-tetracarboxylic acid (H4L(1)), 4,4'-oxydiphthalic acid (H4L(2)), or benzene-1,3,5-tricarboxylic acid (H3L(3)) with corresponding Zn(II) salts, respectively. Single crystal structure analyses reveal that 1 and 2 are constructed by Zn-centered polyhedra, tib and multidentate tetracarboxylate ligands to form 3-dimensional frameworks. In contrast, when the tetracarboxylate ligands were replaced by tricarboxylate ligand, layered structure of 3 is produced. These compounds are further characterized by powder X-ray diffraction, element analyses, thermogravimetric analyses and photoluminescent spectroscopy. The luminescent properties of three Zn-MOFs dispersed in different solvents have been investigated systematically, demonstrating high sensitivity for the detection of nitro compounds via a fluorescence quenching mechanism.
authors: State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, P R China.
authors: Hao
authors: H
authors: Wang
authors: Weiting
authors: W
authors: Yang
authors: Zhong-Ming
authors: ZM
authors: Sun
mesh_terms: D008024:Ligands; D049449:Luminescence; D008958:Models, Molecular; D015394:Molecular Structure; D009574:Nitro Compounds / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D008024:Ligands; D009574:Nitro Compounds; D009942:Organometallic Compounds; D015032:Zinc