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Singh V, Dwivedi AD, Pandey R. Anticounterfeiting Feature of a Writable and Self-Erasable Ni(II)-Metallogel Pad via Fluorescent "Turn-On" Detection of Cyanide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:5121-5136. [PMID: 38419340 DOI: 10.1021/acs.langmuir.3c03036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
A Schiff base 5-(2-hydroxy-3-methoxybenzylidieneamino)-1-H-imidazole-4-carboxamide (HL) comprising multibinding sites has been synthesized with the aim of fabricating a supramolecular gel. The gelator HL was characterized by FT-IR, 1H & 13C NMR, and ESI-MS techniques and also formed a [Ni(L)2] complex. The gelation property of HL was investigated with various metal ions, wherein Ni(II) selectively forms a mechanically and thermally stable supramolecular metallogel (MG) in the presence of a triethylamine base in DMF-MeOH media. Characterization of MG was accomplished with different spectro-analytical techniques such as FT-IR, ESI-MS, powder-XRD, SEM, rheological investigations, UV/vis, and fluorescence. The gelator HL displays moderate emission upon addition of Ni2+ and gives "turn-off" fluorescence output by forming the complex [Ni(L)2] (MG) due to the chelation-enhanced quenching of fluorescence (CHEQ). Job plot and ESI-MS data suggested a 2:1 stoichiometry between HL and Ni(II) in MG. Further, MG exhibited highly selective and ultrasensitive "turn-on" fluorescence signaling with CN- in the background presence of several cations and anions. The limit of detection (LoD) of MG was determined to be 6.9 × 10-9 M for CN- using the fluorescence technique. Notably, MG behaves as a fluorescent writable pad material explicitly with CN- under 365 nm UV light but not under ordinary light and the fluorescent text is self-erased after 15 min. Hence, MG can be used as a metallogel pad in the presence of CN- to communicate secret messages. Overall, the present work explores the fabrication of a thermo- and mechanostable Ni(II)-metallogel (MG), which selectively and ultrasensitively detects CN- both in the solution phase and in the gel form, wherein MG behaves as a writable and self-erasable pad with anticounterfeiting features for practical applications.
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Affiliation(s)
- Vaishali Singh
- Department of Chemistry, National Institute of Technology Uttarakhand, Srinagar (Garhwal) 246174, India
| | - Ambikesh D Dwivedi
- Department of Chemistry, Banaras Hindu University Varanasi, Varanasi 221005, India
| | - Rampal Pandey
- Department of Chemistry, National Institute of Technology Uttarakhand, Srinagar (Garhwal) 246174, India
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Guo S. Can digitalization and low-carbonization progress in harmony? Evidence from Chinese cities. PLoS One 2023; 18:e0292405. [PMID: 37847722 PMCID: PMC10581500 DOI: 10.1371/journal.pone.0292405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 09/19/2023] [Indexed: 10/19/2023] Open
Abstract
Achieving high-quality development of the city requires actively promoting coordinated digitalization and low-carbon development. Previous studies have focused on the unidirectional impact of urban digitalization on low-carbonization and there is a lack of research on their interactions. This study uses the generalized spatial three-stage least squares method and the spatial simultaneous equation to investigate the endogenous interactions between urban digitalization and low-carbonization. The properties of the spatiotemporal evolution are then examined using linked coordination degree models, kernel density, and spatial statistical approaches. Finally, using the spatial panel metering model, this study empirically investigates the motivations behind the synergistic advancement of digitalization and low-carbonization. The results show that: (1) There is an endogenous interaction between urban digitalization and low-carbonization and that this interaction pattern is closely linked to geographical proximity. (2) In general, both urban digitalization and low-carbonization have a positive spatial impact and a negative spatial interaction, and their coordination levels have a significant spatial impact. (3) Throughout the research period, the coordination degree of urban digitalization and low carbonization continued to increase, showing a positive spatial correlation and a balanced development trend. (4) Economic development, industrial structure, and human capital accumulation are vital internal drivers of the synergistic advancement of urban digitalization and low carbonization. Government capacities and technological innovations are key external factors that contribute to the synergistic advancement of urban digitalization and low-carbonization. Overall, the paper is essential not only to deepen understanding of the relationship between urban digitalization and low-carbonization but also to formulate policies for their coordinated development.
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Affiliation(s)
- Siliang Guo
- School of Economics and Management, Qilu Normal University, Jinan, Shandong, China
- School of Economics and Management, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, China
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Binding interactions and Sensing applications of chromone derived Schiff base chemosensors via absorption and emission studies: A comprehensive review. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.110026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Alamro FS, Ahmed HA, Bedowr NS, Khushaim MS, El-atawy MA. New Advanced Liquid Crystalline Materials Bearing Bis-Azomethine as Central Spacer. Polymers (Basel) 2022; 14:1256. [PMID: 35335586 PMCID: PMC8953589 DOI: 10.3390/polym14061256] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 03/14/2022] [Accepted: 03/14/2022] [Indexed: 02/01/2023] Open
Abstract
In this study, a homologous series of novel liquid crystalline compounds bearing the bis-azomethine central linkage (-CH=N-N=CH-), namely ((1E,1'E)-hydrazine-1,2-diylidenebis(methanylylidene))bis(4,1-phenylene) dialkanoate (In), was synthesized, and the mesophase and thermal properties were investigated theoretically and experimentally. The molecular structures of the prepared compounds were determined using elemental analysis, NMR, and FT-IR spectroscopy. The mesophase transitions were detected by differential scanning calorimetry (DSC), and the mesophases were identified using polarized optical microscopy (POM). The results indicated that the derivative with the shortest length (I5) was purely nematogenic, while the other homologues (I9 and I15) possessed SmC mesophases. The optimal geometrical structures of the investigated group were derived theoretically. The estimated results demonstrated that all homologues were mesomorphic, and their type depended on the length of the terminal chains. Computations based on density functional theory (DFT) were used to explain the experimental data. The calculated dipole moment, polarizability, thermal energy, and molecular electrostatic potential all showed that it was possible to predict the mesophase type and stability, which varied according to the size of the molecule.
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Affiliation(s)
- Fowzia S. Alamro
- Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia;
| | - Hoda A. Ahmed
- Department of Chemistry, Faculty of Science, Cairo University, Cairo 12613, Egypt
- Chemistry Department, College of Sciences, Taibah University, Yanbu 30799, Saudi Arabia;
| | - Noha S. Bedowr
- Chemistry Department, College of Sciences, Taibah University, Yanbu 30799, Saudi Arabia;
| | - Muna S. Khushaim
- Department of Physics, Faculty of Science, Taibah University, P.O. Box 30002, Al-Madina 41447, Saudi Arabia;
- Nanotechonolgy Center, Taibah University, P.O. Box 30002, Al-Madina 41447, Saudi Arabia
| | - Mohamed A. El-atawy
- Chemistry Department, College of Sciences, Taibah University, Yanbu 30799, Saudi Arabia;
- Chemistry Department, Faculty of Science, Alexandria University, P.O. Box 426 Ibrahemia, Alexandria 21321, Egypt
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Zhang B, Zhou Q, Zhang X, Ma J, Cong X, Wang Q, Liao Y, Yang Y, Wang H. Thermostable fluorescent supramolecular gels constructed from a single gelator and its application in discriminating organic acids. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Shukla J, Kumar Y, Dixit MK, Mahendar C, Sharma VK, Kalam A, Dubey M. Investigation of the Mechanism Behind Conductive Fluorescent and Multistimuli-responsive Li + -enriched Metallogel Formation. Chem Asian J 2020; 15:3020-3028. [PMID: 32749048 DOI: 10.1002/asia.202000630] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 07/27/2020] [Indexed: 11/11/2022]
Abstract
A fluorescent metallogel (2.6 % w/v) has been obtained from two non-fluorescent components viz. phenyl-succinic acid derived pro-ligand H2 PSL and LiOH (2 equiv.) in DMF. Li+ ion not only plays a crucial role in gelation through aggregation, but also contributed towards enhancement of fluorescence by imposing restriction over excited state intramolecular proton transfer (ESIPT) followed by origin of chelation enhanced fluorescence (CHEF) phenomenon. Further, the participation of CHEF followed by aggregation-caused quenching (ACQ) and aggregation-induced emission (AIE) in the gelation process have been well established by fluorescence experiments. Transmission electron microscopy (TEM) analysis disclosed the sequential creation of nanonuclei followed by nanoballs and their alignment towards the generation of fibers of about 3, 31 and 40 nm diameter, respectively. The presence of a long-range fibrous morphology inside the metallogel was further attested by scanning electron microscopy (SEM). Rheological studies on the metallogel showed its true gel-phase material nature. Nyquist impedance study shows a resistance value of 7.4 kΩ for the metallogel which upon applying ultrasound increased to 8.5 kΩ, while an elevated temperature of 70 °C caused reduction in the resistance value to 4.8 kΩ. The mechanism behind metallogel formation has been well established by using FTIR, UV-vis, SEM, TEM, PXRD, 1 H NMR, fluorescence and ESI-MS.
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Affiliation(s)
- Jay Shukla
- Soft Materials Research Laboratory, Department of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore, 453552, India
| | - Yeeshu Kumar
- Soft Materials Research Laboratory, Department of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore, 453552, India
| | - Manish K Dixit
- Soft Materials Research Laboratory, Department of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore, 453552, India
| | - Chinthakuntla Mahendar
- Soft Materials Research Laboratory, Department of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore, 453552, India
| | - Vinay K Sharma
- Indian Institute of Technology, Banaras Hindu University, Varanasi, 221005, Uttar Pradesh, India
| | - Abul Kalam
- Department of Chemistry, College of Science, King Khalid University, Abha, 61413, KSA
| | - Mrigendra Dubey
- Soft Materials Research Laboratory, Department of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore, 453552, India
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Mahendar C, Kumar Y, Dixit MK, Dubey M. An Li +-enriched Co 2+-induced metallogel: a study on thixotropic rheological behaviour and conductance. SOFT MATTER 2020; 16:3436-3442. [PMID: 32196044 DOI: 10.1039/c9sm02544h] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
An alkali base and counterion-selective red metallogel (1% w/v) has been synthesized by mixing the adipic acid-derived ligand H2AL with LiOH, followed by the addition of 1 equivalent of Co(OAc)2 in DMF. The addition of Co(OAc)2 not only resulted in the formation of a 2 : 2 (M : L) complex, but also led to the consecutive steps of aggregation, fiber creation, entrapment of the solvent and eventually gelation. The metallogel formation and the mechanism behind gelation have been well characterized and established using various instrumental techniques such as FTIR spectroscopy, UV-vis spectroscopy, FE-SEM, TEM, PXRD, ESI-mass spectrometry, Job's plot and rheology analysis. Nyquist plots suggested a large decrease in the resistance value from 11.3 kΩ to 4.2 kΩ for the solution obtained from the ligand deprotonated by LiOH (AL2-) and Co(OAc)2 containing the metallogel. The Nyquist plot and resistance of the metallogel have also been studied under the influence of temperature and ultrasound stimuli. The extensive rheological measurements provide information about the strength of the gel network and the highly reversible nature and thixotropic behaviour of the metallogel.
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Affiliation(s)
- Chinthakuntla Mahendar
- Soft Materials Research Laboratory, Discipline of Metallurgy Engineering and Materials Science, Indian Institute of Technology Indore, Simrol, Indore 453552, India.
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Dixit MK, Chery D, Mahendar C, Bucher C, Dubey M. Nanofabrication of Au nanoparticles over conductive metallohydrogel nanofibers for nanocatalysis application. Inorg Chem Front 2020. [DOI: 10.1039/c9qi01514k] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A conductive and fluorescent metallohydrogel (1% w/v, CPH) has been synthesized and utilized for nanofabrication of AuNps and nanocatalysis applications.
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Affiliation(s)
- Manish Kumar Dixit
- Department of Chemistry
- Indian Institute of Technology (Banaras Hindu University)
- Varanasi 221005
- India
| | - Déborah Chery
- Univ Lyon
- Ens de Lyon
- CNRS UMR 5182
- Université Claude Bernard Lyon 1
- Laboratoire de Chimie
| | - Chinthakuntla Mahendar
- Soft Materials Research Laboratory
- Discipline of Metallurgy Engineering and Materials Science
- Indian Institute of Technology Indore
- Indore 453552
- India
| | - Christophe Bucher
- Univ Lyon
- Ens de Lyon
- CNRS UMR 5182
- Université Claude Bernard Lyon 1
- Laboratoire de Chimie
| | - Mrigendra Dubey
- Soft Materials Research Laboratory
- Discipline of Metallurgy Engineering and Materials Science
- Indian Institute of Technology Indore
- Indore 453552
- India
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Dubey M, Dixit MK, Kumar Y, Shukla J, Chinthakuntla M. Bis(Acylhydrazone)‐Based Bolaamphiphiles: Effect of Spacer Length on Metalloorganogel Formation, Fluorescence and Conductance Properties. Chempluschem 2019. [DOI: 10.1002/cplu.201900589] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mrigendra Dubey
- Indian Institute of Technology IndoreDiscipilne of metallurgy engineering and materials science Discipline of metallurgy engineering and material science (MEMS)Indian Institute of Technology Indore,, Khandwa Road, Simrol 453552 INDORE INDIA
| | | | - Yeeshu Kumar
- Indian Institute of Technology IndoreMetallugy Engineering and Materials Science INDIA
| | - Jay Shukla
- Indian Institute of Technology IndoreMetallurgy Engineering and materials Science INDIA
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Zhang H, Liu S, Zhang C, Fan J, Lin L, Wang C, Song Y. The mechanism of the excited-state proton transfer of Salicylaldehyde azine and 2,2'-[1,4-Phenylenebis{(E)- nitrilomethylidyne}] bisphenol: Via single or double proton transfer. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 223:117321. [PMID: 31277029 DOI: 10.1016/j.saa.2019.117321] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 06/25/2019] [Accepted: 06/25/2019] [Indexed: 06/09/2023]
Abstract
The Salicylaldehyde azine (H2SA) and 2,2'-[1,4-Phenylenebis{(E)-nitrilomethylidyne}] bisphenol (H2SPA) with double proton transfer characteristics were synthesized recently (Phys. Chem. Chem. Phys., 2018, 20, 23,762). However, the detailed theoretical interpretation of proton transfer (PT) mechanism is inadequate. In the present work, density functional theory (DFT) and time-density functional theory (TDDFT) are employed to study the proton transfer mechanism of H2SA and H2SPA in detail. Bond parameters, infrared (IR) spectra and frontier molecular orbitals (FMOs) calculated by PBE0/TZVP method indicate the strength of hydrogen bond is enhanced in S1 state, which can be visualized by the reduced density gradient (RDG) analysis. The potential energy surfaces (PESs) of H2SA and H2SPA are also constructed. The small barriers indicate that both the single proton transfer and double proton transfer of H2SA and H2SPA are more likely to occur in the S1 state. In addition, the properties of H2SA and H2SPA after chelation with Li+ have also been theoretically characterized. According to the calculated fluorescence spectra of compounds (H2SA-Li+ and H2SPA-Li+), it was found that only the planar structure of H2SA-Li+ can form metallogel, which verified the experimental results.
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Affiliation(s)
- Hui Zhang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Songsong Liu
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Changzhe Zhang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Jianzhong Fan
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Lili Lin
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Chuankui Wang
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China
| | - Yuzhi Song
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics, Shandong Normal University, Jinan 250358, China.
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Dixit MK, Mahendar C, Dubey M. Cd2+‐induced Fluorescent Metallogel: A case of CHEF and ACQ phenomenon. Chem Asian J 2019; 17:e201900559. [DOI: 10.1002/asia.201900559] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2019] [Revised: 05/27/2019] [Indexed: 11/08/2022]
Affiliation(s)
- Manish Kumar Dixit
- Indian Institute of Technology (BHU)Chemistry Department of ChemistryIIT (BHU) 221005 Varanasi INDIA
| | - Chinthakuntla Mahendar
- IIT indoreMEMS Discipline of metallurgy engineering and material science (MIIT Indore, Simrol, Indore452020 INDORE INDIA
| | - Mrigendra Dubey
- Indian Institute of Technology IndoreDiscipilne of metallurgy engineering and materials science Discipline of metallurgy engineering and material science (MEMS)Indian Institute of Technology Indore,, Khandwa Road, Simrol 453552 INDORE INDIA
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Ebina M, Kondo Y, Iwasa T, Taketsugu T. Low-Lying Excited States of hqxcH and Zn-hqxc Complex: Toward Understanding Intramolecular Proton Transfer Emission. Inorg Chem 2019; 58:4686-4698. [PMID: 30860367 DOI: 10.1021/acs.inorgchem.9b00410] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Excited state intramolecular proton transfer (ESIPT) has been a topic of interest due to its potential to lead to multiple emissions. Although many organic molecules showing ESIPT emission are already known, studies on metal complexes showing ESIPT and their related theoretical understandings are very limited. In this study, we focus on [Zn(hqxc)2(DMSO)2] (Zn-hqxc: hqxc = 3-hydroxy-2-quinoxalinecarboxylate, DMSO = dimethyl sulfoxide), which shows ESIPT emission in the solid state, even though the hqxcH ligand does not show ESIPT emission. To gain insights into the role of the zinc atom and the emission mechanisms, we examined excited states of free hqxcH and the Zn-hqxc complex using time-dependent density functional theory calculations. From the results, it was shown that the zinc atom triggers a structural change of the hqxcH ligand from the lactam form (3,4-dihydro-3-oxo-2-quinoxalinecarboxylic acid) to the enol form (3-hydroxy-2-quinoxalinecarboxylic acid), where the latter form has several stable excited states. Several stable geometries were found for singlet and triplet excited states, suggesting that emissions for the Zn-hqxc complex can be both phosphorescence and fluorescence caused by the enol-enol, keto-keto, and keto-enol forms of the two hqcx ligands in the complex. We found that the photophysical properties of the Zn-hqxc complex are dominated by the ligand due to the filled d10 of Zn(II). The presented results suggest that, to design new ESIPT metal complexes, one possible approach is to combine a metal atom showing ligand centered emission and a ligand that has separate ESIPT and coordination sites.
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Affiliation(s)
- Masanori Ebina
- Graduate School of Chemical Sciences and Engineering , Hokkaido University , Sapporo 060-0810 , Japan
| | - Yusuke Kondo
- Elements Strategy Initiative for Catalysts and Batteries (ESICB) , Kyoto University , Kyoto 615-8520 , Japan
| | - Takeshi Iwasa
- Elements Strategy Initiative for Catalysts and Batteries (ESICB) , Kyoto University , Kyoto 615-8520 , Japan.,Department of Chemistry, Faculty of Science , Hokkaido University , Sapporo 060-0810 , Japan
| | - Tetsuya Taketsugu
- Graduate School of Chemical Sciences and Engineering , Hokkaido University , Sapporo 060-0810 , Japan.,Elements Strategy Initiative for Catalysts and Batteries (ESICB) , Kyoto University , Kyoto 615-8520 , Japan.,Department of Chemistry, Faculty of Science , Hokkaido University , Sapporo 060-0810 , Japan.,Institute for Chemical Reaction Design and Discovery (WPI-ICReDD) , Hokkaido University , Sapporo 001-0021 , Japan
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