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Synthesis, structural and microstructural study of new FeNa0.5H1.5MoO5 hybrid material for highly efficient energy storage hybrid systems. INORG CHEM COMMUN 2020. [DOI: 10.1016/j.inoche.2020.107811] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Successful synthesis of single scheelite-structured CdW1-xMoxO4 continuous solid-solution and its composition-dependent optoelectronic properties. J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2018.07.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Toulemonde O, Devoti A, Rosa P, Guionneau P, Duttine M, Wattiaux A, Lebraud E, Penin N, Decourt R, Fargues A, Buffière S, Demourgues A, Gaudon M. Probing Co- and Fe-doped LaMO 3 (M = Ga, Al) perovskites as thermal sensors. Dalton Trans 2018; 47:382-393. [PMID: 29218338 DOI: 10.1039/c7dt03647g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of a Co-doped or Fe-doped La(Ga,Al)O3 perovskite via the Pechini process aimed to achieve a color change induced by temperature and associated with spin crossover (SCO). In Fe-doped samples, iron was shown to be in the high-spin state, whereas SCO from the low-spin to the high-spin configuration was detected in Co-doped compounds when the temperature increased. Fe-doped compounds clearly adopted the high-spin configuration even down to 4 K on the basis of Mössbauer spectroscopic analysis. The original SCO phenomenon in the Co-doped compounds LaGa1-xCoxO3 (0 < x < 0.1) was evidenced and discussed on the basis of in situ X-ray diffraction analysis and UV-vis spectroscopy. This SCO is progressive as a function of temperature and occurs over a broad range of temperatures between roughly 300 °C and 600 °C. The determination of a crystal field strength of about 2 eV and a Racah parameter B of about 500 cm-1 for Co3+ (3d6) ions show that these values allow the occurrence of SCO. Hence, this study shows the possibility of using LaGa1-xCoxO3 compounds as thermal sensors at low Co contents (x = 0.02). The competition between steric and electronic effects in LaGaO3 in which Co3+ is stabilized in the LS state shows that electronic effects with the creation of M-O covalent bonds are predominant and contribute to the stabilization of a high crystal field around Co3+ (LS) although its ionic radius is smaller in comparison with that of Ga3+.
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Liu X, Zhu Y, Li W, Wang F, Li H, Ren C, Zhao Y. Modified surficial chemistry micro-circumstance and mid-gap effect on photocatalytic ability of tetracycline by introducing of nitrogen in Fe2(MoO4)3. MOLECULAR CATALYSIS 2017. [DOI: 10.1016/j.mcat.2017.02.034] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Sui Q, Ren XT, Dai YX, Wang K, Li WT, Gong T, Fang JJ, Zou B, Gao EQ, Wang L. Piezochromism and hydrochromism through electron transfer: new stories for viologen materials. Chem Sci 2016; 8:2758-2768. [PMID: 28553511 PMCID: PMC5426459 DOI: 10.1039/c6sc04579k] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Accepted: 12/22/2016] [Indexed: 12/24/2022] Open
Abstract
A pyridinium-carboxylate compound undergoes reversible color change under pressure owing to the formation of radicals via electron transfer; dehydration and hydration can also trigger electron transfer.
While viologen derivatives have long been known for electrochromism and photochromism, here we demonstrated that a viologen-carboxylate zwitterionic molecule in the crystalline state exhibits piezochromic and hydrochromic behaviors. The yellow crystal undergoes a reversible color change to red under high pressure, to green after decompression, and finally back to yellow upon standing at ambient pressure. Ultraviolet-visible spectroscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance X-ray diffraction and DFT calculations suggested that the piezochromism is due to the formation of radicals via pressure-induced electron transfer from carboxylate to pyridinium, without a crystallographic phase transition. It was proposed that electron transfer is induced by pressure-forced reduction of intermolecular donor–acceptor contacts. The electron transfer can also be induced by dehydration, which gives a stable green anhydrous radical phase. The color change is reversible upon reabsorption of water, which triggers reverse electron transfer. The compound not only demonstrates new chromic phenomena for viologen compounds, but also represents the first example of organic mechanochromism and hydrochromism associated with radical formation via electron transfer.
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Affiliation(s)
- Qi Sui
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes , College of Chemistry and Molecular Engineering , East China Normal University , 3663 North Zhongshan Road , Shanghai 200062 , P. R. China .
| | - Xiang-Ting Ren
- Center for High Pressure Science and Technology Advanced Research , 1690 Cailun Road , Shanghai 201203 , P. R. China .
| | - Yu-Xiang Dai
- State Key Laboratory of Superhard Materials , Jilin University , 2699 Qianjin Street , Changchun , Jilin 130012 , P. R. China
| | - Kai Wang
- State Key Laboratory of Superhard Materials , Jilin University , 2699 Qianjin Street , Changchun , Jilin 130012 , P. R. China
| | - Wen-Tao Li
- Center for High Pressure Science and Technology Advanced Research , 1690 Cailun Road , Shanghai 201203 , P. R. China .
| | - Teng Gong
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes , College of Chemistry and Molecular Engineering , East China Normal University , 3663 North Zhongshan Road , Shanghai 200062 , P. R. China .
| | - Jia-Jia Fang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes , College of Chemistry and Molecular Engineering , East China Normal University , 3663 North Zhongshan Road , Shanghai 200062 , P. R. China .
| | - Bo Zou
- State Key Laboratory of Superhard Materials , Jilin University , 2699 Qianjin Street , Changchun , Jilin 130012 , P. R. China
| | - En-Qing Gao
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes , College of Chemistry and Molecular Engineering , East China Normal University , 3663 North Zhongshan Road , Shanghai 200062 , P. R. China .
| | - Lin Wang
- Center for High Pressure Science and Technology Advanced Research , 1690 Cailun Road , Shanghai 201203 , P. R. China .
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