1. Synthesis, structure, and photoluminescence properties of lanthanide based metal organic frameworks and a cadmium coordination polymer derived from 2,2′-diamino-trans 4,4′-stilbenedicarboxylate
- Author
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Conrad W. Ingram, Alexander Steiner, John Bacsa, Kyril M. Solntsev, and Saki T. Golafale
- Subjects
Lanthanide ,Coordination polymer ,Infrared spectroscopy ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Inorganic Chemistry ,Crystallography ,chemistry.chemical_compound ,chemistry ,Materials Chemistry ,Metal-organic framework ,Carboxylate ,Physical and Theoretical Chemistry ,Isostructural ,0210 nano-technology ,Spectroscopy ,Single crystal - Abstract
Two isostructural lanthanide-based metal - organic frameworks, {[Ln(C16H12N2O4)(CHO2)(OH2)·2(C5H11NO)]}n, Ln = Yb (1) and Tm (2), and a cadmium(II) coordination polymer,{[Cd2(C16H12N2O4)(NO3)·4(C3H7NO)]}n, were synthesized by the combination of the respective metal nitrate and 2,2′-diamino-trans 4,4′-stilbenedicarboxylate (C16H12N2O4) under solvothermal conditions [C5H11NO = diethylformamide and C3H7NO = dimethylformamide]. Their structures were determined by X-ray single crystal analysis, X-ray powder diffraction, Fourier transformed infrared spectroscopy, elemental analysis, thermogravimetric analysis and solid state photoluminescence spectroscopy. Both lanthanide structures are infinite three-dimensional non-penetrating networks with extremely large diamond shape accessible channels of cross-sectional dimensions [30 A x 12 A] and with the amino-functional groups projecting into the channels. The cadmium-based structure is a one-dimensional coordination polymer with both the carboxylate and the amino groups coordinating the cadmium atoms, which resulted in a large increase in the rigidity of the ligand. Ligand-based fluorescence was exhibited by all three networks, with the cadmium based structure showing the highest intensity and longest fluorescence radiative lifetime.
- Published
- 2018
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