| In this paper, primary ligand 4,4',4"-tricarboxytriphenylamine ?H3TCA? was synthesized previously. Then Eu, Tb, Zn and Cd ions are selected as central metal ions and different second ligands are selected to adjust the body frame. Eight metal-organic frameworks were designed and synthesized by hydrothermal method. These compounds have been structurally characterized, and the photoluminescent and luminescent sensors were studied respectively.1. Two isomorphic compounds [Eu?TCA??1,4-ndc?·H2O]n ?1?, [Tb?TCA??1,4-ndc?·H2O]n ?2? ?1,4-ndc= 1,4-naphthalenedicarboxylate? have been synthesized and characterized. Crystal structure analyses show that 1 and 2 display 3D framework in which Eu and Tb cations present nona-coordination geometries. Optical investigation indicates that 2 shows a relatively longer luminescence lifetime ?r= 0.342 ms? and significantly enhanced quantum yield ??overall= 11%? compared with those of 1 ??= 0.335 ms,?ovrall= 0.06%?;2. Two MOFs [Zn3?TCA?2?4,4'-bpp?]n ?3?, [Zn6?TCA?4?4,4'-bpt?3·2H2O]n ?4? ?4,4'-bpp= 4,4'-Trimethylenedipyridine,4,4'-bpt= 3,5-di-?4-pyridyl?-1,2,4-triazoles? have been successfully synthesized. Structure analyses determine that there are three Zn ions in the asymmetric units of compounds 3 and 4 and the H3TCA ligand presents two and three bridged fashions, respectively. The oxygen atoms in H3TCA groups and the nitrogen atoms in the second ligands integrate all of the Zn ions, constructing the 3D framework. The researches show that compound 3 provides an ideal luminescence sensor for high selective probing Na+ and Co2+ions and compound 4 displays high selectivity for Fe3+ion.3. Four new metal-organic frameworks{[Cd3?TCA?2?4,4'-bpp?2]·2DMF-4H2O}n ?5?, {[Cd6?TCA?4?4,4'-bpt?3·2H2O]·4DMA·4H2O}n ?6?, [Cd?TCA??4,4'-bpy?0.5]n ?7? and {[Cd3?TCA?2?2,2'-bpy?2·H2O]·2H2O}n ?8? ?4,4'-bpp= 4,4'-Trimethylenedipyridine,4,4'-bpt= 3,5-di-?4-pyridyl?-1,2,4-triazoles,4,4'-bpy= 4,4'-bipyridine,2,2'-bpy= 2,2'-bipyridine? have been successfully prepared. Structure analyses demonstrate that both compounds 5 and 6 exhibit 3D frameworks consisted of trinuclear Cd unit, in which H3TCA presents three bridged fashions; Compound 7 displays 3D framework consisted of mononuclear Cd unit while H3TCA presents single bridged fashion; There are three Cd ions in the asymmetric unit of compound 8, Cd ions are linked to each other to form a 3D framework with bridges of H3TCA and ancillary ligand. The researches show that compounds 5 and 8 display high selectivity for Fe3+ ion, and compounds 6 and 7 provide an ideal luminescence sensor for high selective probing Pb2+/Cu2+ ions and Na+/Fe3+ ions, respectively. |
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