Six isostructural lanthanide-containing MOFs built on a semi-rigid tripodal organic ligand |
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| Affiliation: | 1. New Energy (Photovoltaic) Industry Research Center, Qinghai University, Xining 810006, PR China;2. State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, PR China;1. School of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Zigong, PR China;2. Dermatology department, Unit 32268, 75th Group Army, Dali, YunNan,671003, China;3. Songshan Lake Materials Laboratory, Dongguan, 523808, PR China;4. Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia;5. Department of Science, Faculty of Science, Yamagata University, 1-4-12 Kojirakawa, Yamagata 990-8560, Japan;6. Department of Chemistry, Dr. Ram Manohar Lohiya Awadh University, Ayodhya, 224 001, India |
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| Abstract: | By using a semi-rigid tripodal ligand 1,1′,1′′-(2,4,6-trimethylbenzene-1,3,5-triyl)tris(methylene)tripyridinium-4-olate) (L), six isomorphous lanthanum metal-organic frameworks (MOFs), namely, Pr(L)2(Cl)2]·(Cl)(DMF)0.5·(H2O)·(1), Nd(L)2(Cl)2]·(Cl)(2), Tb(L)2(Cl)2]·(Cl)·(DMF)·(H2O)(3), Eu(L)2(Cl)2]·(Cl)(DMF)·(H2O)(4), La(L)2(Cl)2]·(Cl)(5), Sm(L)2(Cl)2]·(Cl) (DMF)·(H2O) (6), were obtained and characterized by single crystal X-ray diffraction, IR and elemental analysis. Six compounds are isostructural with Ln3 + (Ln = Pr, Nd, Tb, Eu, La, Sm) and in which the Ln3 + is considered as a 6-connecting node and the L ligand is a 3-connecting node to afford a (3,6)-connected 2D layer with kgd topology, which further stacks into 3D supramolecular networks through C-H…O weak interactions. Luminescent properties of these lanthanide MOFs have also been assessed at ambient temperature, in which the Pr3 +-1 and the La3 +-5 are slightly blue-shifted with respect to the ligand. Series of sharp peaks characteristic of the Eu3 +-4, the Tb3 +-3 and Sm3 + ? 6 metal-centered luminescence appear. The Nd3 +-2 has no emission. |
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