1
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Chen ZJ, Lu HF, Chao I, Yang JS. A Rotation-Inversion Dual-Motion Molecular Switch: Race for NMR Signaling. J Org Chem 2022; 87:5029-5034. [PMID: 35321542 DOI: 10.1021/acs.joc.2c00140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The interplay between the thermal helical inversion (THI) of the stiff-stilbene moiety and the rotation of the dimethylamino (DMA) group in 1 results in a dependence of the DMA NMR signals on the THI kinetics in (E)-1 but the rotation kinetics in (Z)-1, because the faster motion mode is responsible. Consequently, the photochemical switching from (E)-1 to (Z)-1 illustrates the phenomenon of "switchable motion detection" by the same set of NMR signals in a dual-motion molecular system.
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Affiliation(s)
- Zi-Jian Chen
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617
| | - Hsiu-Feng Lu
- Institute of Chemistry, Academia Sinica, Taipei, Taiwan 11529
| | - Ito Chao
- Institute of Chemistry, Academia Sinica, Taipei, Taiwan 11529
| | - Jye-Shane Yang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617
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2
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Wang H, Guan Q, Wang X. Theoretical study on pentiptycene molecular brake: photoinduced isomerization and photoinduced electron transfer. J Mol Model 2021; 27:289. [PMID: 34536143 DOI: 10.1007/s00894-021-04900-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Accepted: 09/01/2021] [Indexed: 11/26/2022]
Abstract
The isomerization of the double bond plays an important role in the braking and de-braking of the light-controlled molecular brake. Therefore, the pentiptycene-type (Pp-type) light-controlled molecular brake system ((E)- and (Z)-4'-pentiptycyl vinyl-[1,1'-biphenyl]-4-carbonitrile) containing the C = C double bond was theoretically studied. Combining the 6-31G(d) basis set, the ωB97XD functional with dispersion correction was applied to implement the (E)-configuration and (Z)-configuration initial optimization. Next, using the 6-311G(d,p) basis set, the relaxed potential energy surface scans of the rotation angle were operated, and then the optimization calculations of the transition states at the extremum high points. Analyzing the stagnation points and the rotational transition states on the potential energy profiles, the rotation mechanism and basic energy parameters of the molecular brake were obtained. Then, the DFT computations at ground states and the TD-DFT computations of vertical excitation energy were put into practice at the accuracy of the def-TZVP basis set for the two configurations, and using the natural transition orbital (NTO) analyses combining the excitation energies and absorption spectra, the electronic transition characteristics and electron transfer properties of light-controlled molecular brake were studied. Afterwards, in order to investigate the photoinduced isomerization reaction, the C = C double bond was scanned on the relaxed potential energy surface, and the intermediates of the isomerization reaction were searched and analyzed; thus, the braking mechanism of the light-controlled molecular brake was proposed.
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Affiliation(s)
- Hailong Wang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, Hunan, 411105, People's Republic of China
| | - Qiuping Guan
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, Hunan, 411105, People's Republic of China
| | - Xueye Wang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, Hunan, 411105, People's Republic of China.
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3
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Kartha KK, Takai A, Futera Z, Labuta J, Takeuchi M. Dynamics of Meso–Chiral Interconversion in a Butterfly‐Shape Overcrowded Alkene Rotor Tunable by Solvent Properties. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202102719] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Kalathil K. Kartha
- Molecular Design and Function Group National Institute for Materials Science (NIMS) 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan
| | - Atsuro Takai
- Molecular Design and Function Group National Institute for Materials Science (NIMS) 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan
| | - Zdeněk Futera
- University of South Bohemia Faculty of Science Branišovská 1760 370 05 České Budějovice Czech Republic
| | - Jan Labuta
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA) National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan
| | - Masayuki Takeuchi
- Molecular Design and Function Group National Institute for Materials Science (NIMS) 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan
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4
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Kartha KK, Takai A, Futera Z, Labuta J, Takeuchi M. Dynamics of Meso-Chiral Interconversion in a Butterfly-Shape Overcrowded Alkene Rotor Tunable by Solvent Properties. Angew Chem Int Ed Engl 2021; 60:16466-16471. [PMID: 33905168 DOI: 10.1002/anie.202102719] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 04/15/2021] [Indexed: 11/10/2022]
Abstract
Elucidation of dynamics of molecular rotational motion is an essential part and challenging area of research. We demonstrate reversible diastereomeric interconversion of a molecular rotor composed of overcrowded butterfly-shape alkene (FDF). Its inherent dual rotatory motion (two rotors, one stator) with interconversion between two diastereomers, chiral trans-FDF and meso cis-FDF forms, has been examined in detail upon varying temperatures and solvents. The free energy profile of 180° revolution of one rotor part has a bimodal shape with unevenly positioned maxima (transition states). FDF in aromatic solvents adopts preferentially meso cis-conformation, while in non-aromatic solvents a chiral trans-conformation is more abundant owing to the solvent interactions with peripheral hexyl chains (solvophobic effect). Moderate correlations between the trans-FDF/cis-FDF ratio and solvent parameters, such as refractive index, polarizability, and viscosity were found.
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Affiliation(s)
- Kalathil K Kartha
- Molecular Design and Function Group, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan
| | - Atsuro Takai
- Molecular Design and Function Group, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan
| | - Zdeněk Futera
- University of South Bohemia, Faculty of Science, Branišovská 1760, 370 05, České Budějovice, Czech Republic
| | - Jan Labuta
- World Premier International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki, 305-0044, Japan
| | - Masayuki Takeuchi
- Molecular Design and Function Group, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan
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5
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Komiya N, Ikeshita M, Tosaki K, Sato A, Itami N, Naota T. Catalytic Enantioselective Rotation of Watermill‐Shaped Dinuclear Pd Complexes. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100140] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Naruyoshi Komiya
- Department of Chemistry, Graduate School of Engineering Science Osaka University Machikaneyama, Toyonaka, Osaka 560-8531 Japan
- Chemistry Laboratory The Jikei University School of Medicine Kokuryo, Chofu, Tokyo 182-8570 Japan
| | - Masahiro Ikeshita
- Department of Chemistry, Graduate School of Engineering Science Osaka University Machikaneyama, Toyonaka, Osaka 560-8531 Japan
| | - Koichi Tosaki
- Department of Chemistry, Graduate School of Engineering Science Osaka University Machikaneyama, Toyonaka, Osaka 560-8531 Japan
| | - Atsushi Sato
- Department of Chemistry, Graduate School of Engineering Science Osaka University Machikaneyama, Toyonaka, Osaka 560-8531 Japan
| | - Nao Itami
- Department of Chemistry, Graduate School of Engineering Science Osaka University Machikaneyama, Toyonaka, Osaka 560-8531 Japan
| | - Takeshi Naota
- Department of Chemistry, Graduate School of Engineering Science Osaka University Machikaneyama, Toyonaka, Osaka 560-8531 Japan
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6
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Chen ZJ, Lu HF, Chiu CW, Hou FM, Matsunaga Y, Chao I, Yang JS. A Molecular Rotor That Probes the Helical Inversion of Stiff-Stilbene. Org Lett 2020; 22:9158-9162. [PMID: 33052674 DOI: 10.1021/acs.orglett.0c02993] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Probing the inversion kinetics of a molecular helix is inherently a challenging task. We demonstrate herein that a fast-rotating pentiptycene component could function as an external NMR probe to afford the kinetic information on the inversion of a neighboring helical stiff-stilbene unit.
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Affiliation(s)
- Zi-Jian Chen
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617
| | - Hsiu-Feng Lu
- Institute of Chemistry, Academia Sinica, Taipei, Taiwan 11529
| | - Chun-Wei Chiu
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617
| | - Fen-Miao Hou
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617
| | - Yuki Matsunaga
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617
| | - Ito Chao
- Institute of Chemistry, Academia Sinica, Taipei, Taiwan 11529
| | - Jye-Shane Yang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617
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7
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Jia Z, Guan Q, Wang H, Wang X. Theoretical investigation on cis-trans isomerisation of azaphosphatriptycene- based molecular gear. Supramol Chem 2020. [DOI: 10.1080/10610278.2020.1842406] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Zishang Jia
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, Hunan, PR China
| | - Qiuping Guan
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, Hunan, PR China
| | - Hailong Wang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, Hunan, PR China
| | - Xueye Wang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan, Hunan, PR China
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8
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Liepuoniute I, Jellen MJ, Garcia-Garibay MA. Correlated motion and mechanical gearing in amphidynamic crystalline molecular machines. Chem Sci 2020; 11:12994-13007. [PMID: 34094484 PMCID: PMC8163207 DOI: 10.1039/d0sc04495d] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Accepted: 10/15/2020] [Indexed: 12/21/2022] Open
Abstract
In this review we highlight the recent efforts towards the development of molecular gears with an emphasis on building molecular gears in the solid state and the role that molecular gearing and correlated motions may play in the function of crystalline molecular machines. We discuss current molecular and crystal engineering strategies, challenges associated with engineering correlated motion in crystals, and outline experimental and theoretical tools to explore gearing dynamics while highlighting key advances made to date.
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Affiliation(s)
- Ieva Liepuoniute
- Department of Chemistry and Biochemistry, University of California Los Angeles CA 90095-1569 USA
| | - Marcus J Jellen
- Department of Chemistry and Biochemistry, University of California Los Angeles CA 90095-1569 USA
| | - Miguel A Garcia-Garibay
- Department of Chemistry and Biochemistry, University of California Los Angeles CA 90095-1569 USA
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9
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Chiu C, Yang J. Photoluminescent and Photoresponsive Iptycene‐Incorporated π‐Conjugated Systems: Fundamentals and Applications. CHEMPHOTOCHEM 2020. [DOI: 10.1002/cptc.201900300] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Chun‐Wei Chiu
- Department of ChemistryNational Taiwan University No 1, Sec 4, Roosevelt Rd Taipei 10617 Taiwan
| | - Jye‐Shane Yang
- Department of ChemistryNational Taiwan University No 1, Sec 4, Roosevelt Rd Taipei 10617 Taiwan
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10
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Theoretical design and rotational conformation analysis of molecular bevel gear with triptycene as rotator. Theor Chem Acc 2020. [DOI: 10.1007/s00214-020-2576-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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Okamura K, Inagaki Y, Momma H, Kwon E, Setaka W. Gear Slippage in Molecular Bevel Gears Bridged with a Group 14 Element. J Org Chem 2019; 84:14636-14643. [PMID: 31610124 DOI: 10.1021/acs.joc.9b02214] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Ditriptycilmethanes are known as molecular bevel gears because the two triptycil groups show correlated rotation. In this report, molecular bevel gears bridged with a group 14 element, bis(methyltriptycil)X (X = SiH2, GeH2, GeF2), were synthesized, and their gearing properties were investigated. Gear slippage, that is an error in gear rotation, is observed in high-temperature solutions of molecular bevel gears. Heavy atom derivatives undergo gear slippage more easily due to the long bond lengths and wide angles between the two triptycil units and the bridging group 14 element. Activation energies of gear slippages were estimated by temperature-dependent NMR spectroscopy and DFT calculations, and theoretical thermodynamic parameters for gear slippage were found to be in excellent agreement with experimental values. The results indicate that theoretical calculations for gear rotation in molecular bevel gears can accurately reproduce experimental phenomena.
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Affiliation(s)
- Kazuma Okamura
- Division of Applied Chemistry, Faculty of Urban Environmental Sciences , Tokyo Metropolitan University , 1-1 minami-Osawa , Hachioji, Tokyo 192-0397 , Japan
| | - Yusuke Inagaki
- Division of Applied Chemistry, Faculty of Urban Environmental Sciences , Tokyo Metropolitan University , 1-1 minami-Osawa , Hachioji, Tokyo 192-0397 , Japan
| | - Hiroyuki Momma
- Research and Analytical Center for Giant Molecules, Graduate School of Science , Tohoku University , Aoba-ku, Sendai 980-8578 , Japan
| | - Eunsang Kwon
- Research and Analytical Center for Giant Molecules, Graduate School of Science , Tohoku University , Aoba-ku, Sendai 980-8578 , Japan
| | - Wataru Setaka
- Division of Applied Chemistry, Faculty of Urban Environmental Sciences , Tokyo Metropolitan University , 1-1 minami-Osawa , Hachioji, Tokyo 192-0397 , Japan
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12
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Goswami A, Saha S, Biswas PK, Schmittel M. (Nano)mechanical Motion Triggered by Metal Coordination: from Functional Devices to Networked Multicomponent Catalytic Machinery. Chem Rev 2019; 120:125-199. [DOI: 10.1021/acs.chemrev.9b00159] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Abir Goswami
- Center of Micro- and Nanochemistry and Engineering, Organische Chemie I, Universität Siegen, Adolf-Reichwein-Strase 2, D-57068 Siegen, Germany
| | - Suchismita Saha
- Center of Micro- and Nanochemistry and Engineering, Organische Chemie I, Universität Siegen, Adolf-Reichwein-Strase 2, D-57068 Siegen, Germany
| | - Pronay Kumar Biswas
- Center of Micro- and Nanochemistry and Engineering, Organische Chemie I, Universität Siegen, Adolf-Reichwein-Strase 2, D-57068 Siegen, Germany
| | - Michael Schmittel
- Center of Micro- and Nanochemistry and Engineering, Organische Chemie I, Universität Siegen, Adolf-Reichwein-Strase 2, D-57068 Siegen, Germany
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13
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Saha S, Biswas PK, Schmittel M. Reversible Interconversion of a Static Metallosupramolecular Cage Assembly into a High-Speed Rotor: Stepless Adjustment of Rotational Exchange by Nucleophile Addition. Inorg Chem 2019; 58:3466-3472. [PMID: 30789716 DOI: 10.1021/acs.inorgchem.8b03567] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The self-assembled cage ROT-1 was prepared from the pyridine-terminated rotator 1, the phenanthroline-appended stator 2, DABCO, and copper(I) ions in a ratio of 1:1:1:4. This four-component assembly is held together by two pyridine→[Cu(phenAr2)]+ as well as two DABCO→zinc porphyrin interactions (phenAr2 = 2,9-diarylphenanthroline) and does not show any motion on the NMR time scale ( k < 0.1 s-1, 298 K). However, it is converted to the fast nanorotor ROT-1 xCD3CN by addition of CD3CN [ x = (v/v)% of acetonitrile in dichloromethane] due to acceleration of both pyridine→copper(I) dissociation steps. Now the rotator is able to visit all four copper(I)-loaded phenanthroline stations of the stator. Depending on the amount of CD3CN, the exchange frequency of the nanorotor varies from 0.7 s-1 (CD3CN:CD2Cl2 = 1:29) to 8000 s-1 (CD3CN:CD2Cl2 = 1:5) at 25 °C. When iodide (I-) is added to the static assembly ROT-1, the rotational speed increases even more drastically ( k = 20 000 s-1), again due to accelerating the rate-determining pyridine→copper(I) dissociation step. In both cases, a sigmoidal relationship is established between exchange frequency and the concentration of added nucleophile (CD3CN or iodide) that suggests the presence of a cooperative effect. Reversible switching between the static assembly and fast rotor was performed several times without any decomposition of the system. In contrast, addition of the common nucleophile PPh3 to ROT-1 does not increase the rotational speed, a finding that is explained on thermodynamic grounds.
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Affiliation(s)
- Suchismita Saha
- Center of Micro- and Nanochemistry and Engineering , Organische Chemie I , Adolf-Reichwein-Str. 2 , D-57068 Siegen , Germany
| | - Pronay Kumar Biswas
- Center of Micro- and Nanochemistry and Engineering , Organische Chemie I , Adolf-Reichwein-Str. 2 , D-57068 Siegen , Germany
| | - Michael Schmittel
- Center of Micro- and Nanochemistry and Engineering , Organische Chemie I , Adolf-Reichwein-Str. 2 , D-57068 Siegen , Germany
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14
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Affiliation(s)
- Senkai Han
- College of Chemistry; Beijing Normal University; Xinjiekouwaidajie 19 100875 Beijing P.R. China
| | - Yingying Wu
- College of Chemistry; Beijing Normal University; Xinjiekouwaidajie 19 100875 Beijing P.R. China
| | - Ran Duan
- Institute of Chemistry; Chinese Academy of Sciences; Zhongguancun North First Street 2 100190 Beijing P.R. China
| | - Hua Jiang
- College of Chemistry; Beijing Normal University; Xinjiekouwaidajie 19 100875 Beijing P.R. China
| | - Ying Wang
- College of Chemistry; Beijing Normal University; Xinjiekouwaidajie 19 100875 Beijing P.R. China
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15
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Wang Z, Liu K, Chang X, Qi Y, Shang C, Liu T, Liu J, Ding L, Fang Y. Highly Sensitive and Discriminative Detection of BTEX in the Vapor Phase: A Film-Based Fluorescent Approach. ACS APPLIED MATERIALS & INTERFACES 2018; 10:35647-35655. [PMID: 30229655 DOI: 10.1021/acsami.8b13747] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
BTEX (benzene, toluene, ethylbenzene, o-xylene, m-xylene, and p-xylene) represents a group of volatile organic compounds (VOCs) and constitutes a great threat to human health. However, sensitive, selective, and speedy detection of them on-site and in the vapor phase remains a challenge for years. Herein, we report a film-based fluorescent approach and a conceptual sensor, which shows unprecedented sensitivity, speed, and reversibility to the aromatic hydrocarbons in the vapor phase. In the studies, pentiptycene was employed to produce a nonplanar perylene bisimide (PBI) derivative, P-PBI. The compound was further utilized to fabricate the film. The novelty of the design is the combination of capillary condensation and solvent effect, which is expected to enrich the analytes from vapor phase and shows outputs at the same time. Importantly, the film permits instant response (∼3 s) and real-time identification (<1 min) of benzene and toluene from other aromatic hydrocarbons. The experimental detection limits (DLs) of the six analytes are lower than 9.2, 2.7, 1.9, 0.2, 0.4, and 0.4 ppm, which with the exception of benzene, are significantly lower than the NIOSH recommended long-term exposure limits. More importantly, the film is photochemically stable, and more than 300 repetitive tests showed no observable bleaching. In addition, the sensing is fully reversible. The superior performance of the film device is in support of the assumption that the combination of capillary condensation and solvation effect would constitute an effective way to design high-performance fluorescent films, especially for challenging chemical inert and photoelectronically inactive VOCs.
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16
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Tan WS, Lee TY, Hsu YF, Huang SJ, Yang JS. Iptycene substitution enhances the electrochemical activity and stability of polyanilines. Chem Commun (Camb) 2018; 54:5470-5473. [PMID: 29749413 DOI: 10.1039/c8cc02387e] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electrochemical stability of polyaniline (PANI) films is a key issue for their application as electrode materials. This work demonstrates that a low fraction (<5%) of pentiptycene incorporation of the PANI conjugated backbone could significantly enhance the capacitive performance and charge-discharge cycling stability of PANI films, attributable to the clipping effect of pentiptycene cavities that restricts motional freedom of polymer chains and promotes interchain conductivity.
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Affiliation(s)
- Wei Shyang Tan
- Department of Chemistry, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, 10617, Taiwan, Republic of China.
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17
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Abstract
Despite having significant applications in building nanomachines, molecular rotors with the rotational speed modulations to multiple stages in a wide range of frequency have not yet been well established. Here, we report the discovery of a stimuli-responsive molecular rotor, the rotational speed of which in the slow-to-fast range could be modulated to at least four stages triggered by acid/base and metal cations. The rotor itself rotates rapidly at ambient or elevated temperature but displays a restricted rotation after deprotonation due to the produced intramolecular electrostatic repulsion. Subsequent addition of Li+ or Na+ cations introduces an electrostatic bridge to stabilize the transition state of the deprotonated rotor, thus giving a cation-radius-dependent acceleration of the rotation to render the rotor running at a mid-speed. All the stimuli are highly reversible. Our studies provide a conceptual approach for constructing multistage rotational-speed-changing molecular rotors, and further, the practical nanomachines. Molecular rotors with rotational speed modulation have not yet been well established. Here, the authors report a pH and metal cation triggered molecular rotor, which allows for a four stage speed modulation in the slow-to-fast frequency range.
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18
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Meshkov IN, Bulach V, Gorbunova YG, Jouaiti A, Sinelshchikova AA, Kyritsakas N, Grigoriev MS, Tsivadze AY, Hosseini MW. Molecular brakes based on the Zn(ii) porphyrin dimer. NEW J CHEM 2018. [DOI: 10.1039/c8nj01219a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The rotational movement of molecular brakes based on two Zn–porphyrin units interconnected by a spacer may be reversibly locked by addition of an external auxiliary ligand.
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Affiliation(s)
- Ivan N. Meshkov
- Molecular Tectonics Laboratory
- UMR UDS-CNRS
- 7140 & icFRC
- Université de Strasbourg
- Strasbourg
| | - Véronique Bulach
- Molecular Tectonics Laboratory
- UMR UDS-CNRS
- 7140 & icFRC
- Université de Strasbourg
- Strasbourg
| | - Yulia G. Gorbunova
- Frumkin Institute of Physical Chemistry and Electrochemistry
- Russian Academy of Sciences
- Moscow
- Russia
- Kurnakov Institute of General and Inorganic Chemistry
| | - Abdelaziz Jouaiti
- Molecular Tectonics Laboratory
- UMR UDS-CNRS
- 7140 & icFRC
- Université de Strasbourg
- Strasbourg
| | - Anna A. Sinelshchikova
- Frumkin Institute of Physical Chemistry and Electrochemistry
- Russian Academy of Sciences
- Moscow
- Russia
| | - Nathalie Kyritsakas
- Molecular Tectonics Laboratory
- UMR UDS-CNRS
- 7140 & icFRC
- Université de Strasbourg
- Strasbourg
| | - Mikhail S. Grigoriev
- Frumkin Institute of Physical Chemistry and Electrochemistry
- Russian Academy of Sciences
- Moscow
- Russia
| | - Aslan Yu. Tsivadze
- Frumkin Institute of Physical Chemistry and Electrochemistry
- Russian Academy of Sciences
- Moscow
- Russia
- Kurnakov Institute of General and Inorganic Chemistry
| | - Mir Wais Hosseini
- Molecular Tectonics Laboratory
- UMR UDS-CNRS
- 7140 & icFRC
- Université de Strasbourg
- Strasbourg
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19
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Wojcik L, Michaud F, Gauthier S, Cabon N, Le Poul P, Gloaguen F, Le Poul N. Reversible Redox Switching of Chromophoric Phenylmethylenepyrans by Carbon-Carbon Bond Making/Breaking. J Org Chem 2017; 82:12395-12405. [PMID: 29058426 DOI: 10.1021/acs.joc.7b02199] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Electrochromic organic systems that can undergo substantial variation of their optical properties upon electron stimulus are of high interest for the development of functional materials. In particular, devices based on radical dimerization are appropriate because of the effectiveness and speed of carbon-carbon bond making/breaking. Phenylmethylenepyrans are organic chromophores which are well suited for such purposes since their oxidation leads to the reversible formation of bispyrylium species by radical dimerization. In this paper, we show that the redox and spectroscopic properties of phenylmethylenepyrans can be modulated by adequate variation of the substituting group on the para position of the phenyl moiety, as supported by DFT calculations. This redox switching is reversible over several cycles and is accompanied by a significant modification of the UV-vis spectrum of the chromophore, as shown by time-resolved spectroelectrochemistry in thin-layer conditions.
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Affiliation(s)
- Laurianne Wojcik
- Laboratoire CEMCA, CNRS UMR 6521, Université de Bretagne Occidentale , 6 Avenue Le Gorgeu, CS 93837, Brest 29238 Cedex, France
| | - François Michaud
- Service PIMM-DRX, Université de Bretagne Occidentale , 6 Avenue Le Gorgeu, CS 93837, Brest29238 Cedex, France
| | - Sébastien Gauthier
- IUT de Lannion, CNRS UMR 6226, Institut des Sciences Chimiques de Rennes, Université de Rennes 1 , Rue Edouard Branly, 22300 Lannion, France
| | - Nolwenn Cabon
- IUT de Lannion, CNRS UMR 6226, Institut des Sciences Chimiques de Rennes, Université de Rennes 1 , Rue Edouard Branly, 22300 Lannion, France
| | - Pascal Le Poul
- IUT de Lannion, CNRS UMR 6226, Institut des Sciences Chimiques de Rennes, Université de Rennes 1 , Rue Edouard Branly, 22300 Lannion, France
| | - Frederic Gloaguen
- Laboratoire CEMCA, CNRS UMR 6521, Université de Bretagne Occidentale , 6 Avenue Le Gorgeu, CS 93837, Brest 29238 Cedex, France
| | - Nicolas Le Poul
- Laboratoire CEMCA, CNRS UMR 6521, Université de Bretagne Occidentale , 6 Avenue Le Gorgeu, CS 93837, Brest 29238 Cedex, France
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20
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Tao S, Guo C, Liu N, Dai B. Counteranion-Controlled Ag2O-Mediated Benzimidazolium Ring Opening and Its Application in the Synthesis of Palladium Pincer-Type Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00651] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Sheng Tao
- School of Chemistry
and Chemical Engineering, Key Laboratory for Green Processing of Chemical
Engineering of Xinjiang Bingtuan, Shihezi University, North Fourth Road, Shihezi, Xinjiang 832003, People’s Republic of China
| | - Cheng Guo
- Cancer Institute, The Second
Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, People’s Republic of China
| | - Ning Liu
- School of Chemistry
and Chemical Engineering, Key Laboratory for Green Processing of Chemical
Engineering of Xinjiang Bingtuan, Shihezi University, North Fourth Road, Shihezi, Xinjiang 832003, People’s Republic of China
| | - Bin Dai
- School of Chemistry
and Chemical Engineering, Key Laboratory for Green Processing of Chemical
Engineering of Xinjiang Bingtuan, Shihezi University, North Fourth Road, Shihezi, Xinjiang 832003, People’s Republic of China
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