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 and characterization of luminescent polyfluorenes incorporating side-chain-tethered polyhedral oligomeric silsesquioxane units
Chou, Chia-Hung,Hsu, So-Lin,Dinakaran,Chiu, Mao-Yuan,Wei, Kung-Hwa
, p. 745 - 751 (2005)
Using Suzuki polycondensation, we have synthesized polyhedral silseaquioxane-tethered polyfluorene copolymere, poly(9,9'-dioctylfluorene-co-9,9'-bis[4-(N,N-dipolysilsesquioxane)aminophenyl] -fluorene) (PFO - POSS), that have well-defined architectures. Th
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.].
Novel conjugated copolymers based on dithiafulvalene moiety for bulk heterojunction solar cells
Chen, Yung-Chung,Hsu, Chih-Yu,Lin, Jiann T.
, p. 2121 - 2129 (2012)
New conjugated copolymers, P1-P3, based on dithiafulvalene-fused entity and different conjugated segments have been synthesized. Incorporation of electron-deficient conjugated segments into the conjugated copolymers results in red shifting the absorption
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
Highly efficient synthesis of 9-fluorenones from 9H-fluorenes by air oxidation
Zhang, Xin,Ji, Xuan,Jiang, Shanshan,Liu, Lili,Weeks, Brandon L.,Zhang, Zhao
, p. 1891 - 1896 (2011)
9-Fluorenones substituted with nitro, halogen, or alkyl groups can be easily obtained in high yield and purity by aerobic oxidation of 9H-fluorenes under ambient conditions in the presence of KOH in THF.
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
(E)-2,2'Dibromo-7,7'-bis(diphenylamino)-9,9'-bifluorenylidene as a new electron acceptor for organic photovoltaic cells
Park, On You,Kim, Hee Un,Park, Jong Baek,Hwang, Do-Hoon
, p. 8225 - 8230 (2014)
(E)-2,2'-Dibromo-7,7'-bis(diphenylamino)-9,9'-bifluorenylidene (BDPABF) was synthesized as a new non-fullerene-type electron acceptor for organic photovoltaic cells. The UV-visible absorption spectra of BDPABF showed two main bands at 319 and 474 nm in a
Four alkoxohexavanadate-based pd-polyoxovanadates as robust heterogeneous catalysts for oxidation of benzyl-alkanes
Li, Ji-Kun,Huang, Xian-Qiang,Yang, Song,Ma, Hong-Wei,Chi, Ying-Nan,Hu, Chang-Wen
, p. 1454 - 1461 (2015)
Four alkoxohexavanadate-based Pd-POVs [Pd(dpa)(acac)]2[V6O13(OMe)6] (1), [Pd(dpa)(acac)]2[V6O11(OMe)8] (2), [Pd(dpa)(acac)]2[V6O11(OMe)8]·H2O (3), and [Pd(DMAP)2(acac)]2[V6O11(OMe)8]·H2O (4) (POV = polyoxovanadate; dpa = 2,2′-dipyridine amine; DMAP = 4-dimethylaminopyridine; acac = acetylacetone anion) have been synthesized and fully characterized by single crystal X-ray diffraction and powder X-ray diffraction analyses, Fourier transform infrared spectroscopy, element analyses, and X-ray photoelectron spectroscopy. In 1-4, Pd complexes and hexavanadate anions are assembled through electrostatic interactions. Interestingly, the [V6O11(OMe)8]2- cores in 2 and 3 are a pair of isomers that can be isolated by controlling crystallization temperature. Moreover, to the best of our knowledge, the {V6} core in 3 represents a new octamethoxyhexavanadates cluster. It is notable that compounds 1-4 exhibit excellent heterogeneous catalytic performance in the oxidation of benzyl-alkanes with t-butylhydroperoxide as oxidant. Among them, the catalytic activity of 1 (conv. and selec. up to 99%, respectively) outperforms others and can be reused without losing its activity.
