14348-75-5Relevant articles and documents
Photochromism of dihydroindolizines. Part XXIV: Exploiting “Click” chemistry strategy in the synthesis of fluorenyldihydroindolizines with multiaddressable photochromic properties
Ahmed, Saleh A.,El Guesmi, Nizar,Althagafi, Ismail I.,Khairou, Khalid S.,Altass, Hatem M.,Abdel-Wahab, Aboel-Magd A.,Asghar, Basim H.,Katouah, Hanadi A.,Abourehab, Mohamed A.S.
, p. 210 - 223 (2018)
A new category of photochromic dihydroindolizines (DHIs) incorporating substituted 2,7- and 4-substituted tetrazole and oxadiazole moieties in the fluorene skeleton (region A) were efficiently prepared utilizing “Click” chemistry approaches. The structure elucidation for all synthesized precursors as well as the target photochromic DHIs was carried out using some analytical and spectroscopic techniques. A highly tunable photochromic behaviors of the parent dihydroindolizine are possible by the introduction of substituents in different positions of the DHI framework. For example, the substituents in 2,7 and 4-positions of fluorene part showed the ability for extending photochromism. The photochromic behaviors of photochromic DHIs substituted in fluorene part (region A) such as the reaction kinetics and fluorescence properties and their photo-fatigue resistance were studied. It has been disclosed that the replacement of the tetrazole moieties in 2,7-position in (region A) by oxadiazole moieties has strong effect on both the spectral, kinetic characteristics, fluorescence emission and photostability. The observations of this work imply that the substituent groups in the fluorene part influenced the thermal back-reaction rates and played an imperative role in controlling all photochromic properties of the open form. The new synthesized substituted (DHIs) in the fluorene by both tetrazole moieties in 2,7-position and by oxadiazole moieties in 2,7 and 4 positions in fluorene part made these materials act as fluorophores and postulate new opportunities for the design of the next generation of photochromic materials which will make it talented materials in many applications such as electronic smart materials, photochromic glasses, photonic devices and fluorescent fabrics. Because of their noticeable fluorescence emission high photostability, these materials can be used as fluorophores, recording or storage information for numerous periods without color fading.
Synthesis, Crystal Structure, and Catalytic Property of a Copper Coordination Compound Based on In Situ Generated 2-Hydroxynicotinic Acid
Wu, Ren-Tao,Li, Ji-Kun,Wei, Chuan-Ping,Ma, Xian
, p. 234 - 240 (2020)
Abstract: The copper coordination complex [CuCl(2-OHNA)H2O]·H2O (1) was synthesized by the reaction of CuCl2·2H2O with in situ generated 2-hydroxynicotinic acid and its crystal structure was determined by single X-ray diffraction methods. It was further characterized by FT-IR spectroscopy, elemental analyses, and thermogravimetric analysis. Complex 1 crystallizes in monoclinic space group P21/c with a = 8.9797(13), b = 14.196(2), c = 7.0738(11) ?, β = 96.897(2), V = 895.2(2) ?3, Mr = 273.12, Dc = 2.027?g/cm3, and Z = 4. In the structure, complex 1 is linked into 2D sheets via intermolecular hydrogen bonding [N1–H1···O2 (?x+1, y ? 1/2, ? z+1/2); O5–H10···O2 (? x+1, y + 1/2, ? z+1/2); O4–H9···O5 (x, y ? 1, z); O4–H8···O5 (? x+2, y + 1, ? z)]. The catalytic property of 1 was also investigated in the selective oxidation of benzyl-alkanes using TBHP as oxidant. Under optimized conditions, 1 exhibited high catalytic activity and selectivity toward the corresponding aryl ketones. Graphic Abstract: The copper coordination complex [CuCl(2-OHNA)H2O]·H2O (1) was synthesized by the reaction of CuCl2·2H2O with in situ generated 2-hydroxynicotinic acid and the catalytic property of 1 was also investigated in the selective oxidation of benzyl-alkanes using TBHP as oxidant.[Figure not available: see fulltext.].
Vice versa donor acceptor fluorene-ferrocene alternate copolymer: A twisted ribbon for electrical switching
Chakraborty, Chanchal,Bera, Manas Kumar,Rana, Utpal,Malik, Sudip
, p. 13123 - 13126 (2015)
Two donor-acceptor type copolymers (PFFC-1 and PFFC-2) containing ferrocene and fluorene moieties have been successfully synthesized to evaluate the redox triggered optical and electronic properties. Interestingly, PFFC-1 shows a twisted ribbon-like morphology at the liquid interface and switches to a micellar structure on oxidation.
Semiperfluoroalkyl polyfluorenes for orthogonal processing in fluorous solvents
Lee, Jin-Kyun,Fong, Hon Hang,Zakhidov, Alexander A.,McCluskey, Georgia E.,Taylor, Priscilla G.,Santiago-Berrios, MitK'El,Abruna, Hector D.,Holmes, Andrew B.,Malharas, George G.,Ober, Christopher K.
, p. 1195 - 1198 (2010)
The challenging synthesis of semiperfluoroalkyl polyfluorenes and characterization of their electro-optical properties has been reported. Solutions of conjugated polymers can be dispensed onto the desired area by inkjet printing or screen printing, or for
Monodentate Transient Directing Group Assisted Pd-Catalyzed Direct Dehydrogenative Cross-Coupling of Benzaldehydes with Arenes toward 9-Fluorenones
Wang, Yi-Feng,Xu, Wen-Gang,Sun, Bing,Yu, Qin-Qin,Li, Tuan-Jie,Zhang, Fang-Lin
, p. 13104 - 13111 (2019)
Commercially available 3,5-bis(trifluoromethyl)aniline was found to be a highly efficient monodentate transient directing group (MonoTDG) for the palladium-catalyzed direct dehydrogenative cross-coupling of benzaldehydes with arenes. A diverse set of symm
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Suzuki,K. et al.
, p. 2217 - 2222 (1970)
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Borowitz,Anschel
, p. 1517 (1967)
Nonvolatile write-once read-many-times memory behaviors of polyimides containing tetraphenyl fluorene core and the pendant triphenylamine or carbazole moieties
Yang, Yanhua,Ding, Zijun,Xia, Jingcheng,Zheng, Youxuan,Ding, Shijin,Shen, Yingzhong
, p. 1630 - 1644 (2018)
To better understand the structure–property relationships, two novel aromatic diamines containing tetraphenyl fluorene (TPF) moiety through triphenylamine (TPA) unit and carbazole (Cz) unit modification are designed and synthesized, respectively. Four thermally stable and excellent solubility polyimides are prepared and characterized. The excellent film-formation ability and thin film stability are investigated by X-ray diffraction (XRD) and atom force microscopy (AFM) measurements, respectively. The memory devices are fabricated, PIs films with low water uptakes sandwiched between indium-tin oxide (ITO) ground electrode and Al top electrode, and exhibit nonvolatile write-once read-many-times (WORM) memory behaviors with low threshold voltages, due to increasing the retention time through regulating the energy level. The current conduction mechanisms of all devices are linearly fitted by theoretical conduction model. Molecular simulations are used to demonstrate switching mechanism and the memory effects. The experimental results provide a sight for the design-adjustable switching voltage of memory devices.
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Minabe,M.,Suzuki,K.
, p. 1301 - 1303 (1975)
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Oxidative carbon-carbon bond cleavage of 1,2-diols to carboxylic acids/ketones by an inorganic-ligand supported iron catalyst
Chen, Weiming,Xie, Xin,Zhang, Jian,Qu, Jian,Luo, Can,Lai, Yaozhu,Jiang, Feng,Yu, Han,Wei, Yongge
supporting information, p. 9140 - 9146 (2021/11/23)
The carbon-carbon bond cleavage of 1,2-diols is an important chemical transformation. Although traditional stoichiometric and catalytic oxidation methods have been widely used for this transformation, an efficient and valuable method should be further explored from the views of reusable catalysts, less waste, and convenient procedures. Herein an inorganic-ligand supported iron catalyst (NH4)3[FeMo6O18(OH)6]·7H2O was described as a heterogeneous molecular catalyst in acetic acid for this transformation in which hydrogen peroxide was used as the terminal oxidant. Under the optimized reaction conditions, carbon-carbon bond cleavage of 1,2-diols could be achieved in almost all cases and carboxylic acids or ketones could be afforded with a high conversion rate and high selectivity. Furthermore, the catalytic system was used efficiently to degrade renewable biomass oleic acid. Mechanistic insights based on the observation of the possible intermediates and control experiments are presented.
Control the self-assembly of fluorenone-based polycatenars by tuning chain length
Zhao, Kai,Xiao, Yulong,Guo, Chunxiang,Chang, Qing,Gao, Hongfei,Cheng, Xiaohong
, p. 409 - 415 (2019/01/04)
Using Suzuki coupling reactions as key steps, a series of fluorenone-based polycatenars, consisting of a central 2,7-diphenyl-9-fluorenone core connected with the 3,4,5-trialkoxybenzoate unit via –COO- linkage at each side have been synthesized. Upon elon
