1
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Pandey A, Chernyshev A, Panthi YR, Zedník J, Šturcová A, Konefał M, Kočková O, Foulger SH, Vohlídal J, Pfleger J. Synapse-Mimicking Memristors Based on 3,6-Di( tpy)-9-Phenylcarbazole Unimer and Its Copolymer with Cobalt(II) Ions. Polymers (Basel) 2024; 16:542. [PMID: 38399920 PMCID: PMC10892321 DOI: 10.3390/polym16040542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2023] [Revised: 02/09/2024] [Accepted: 02/14/2024] [Indexed: 02/25/2024] Open
Abstract
The title compound, unimer U (tpy stands for 2,2':6',2″-terpyridin-4'-yl end-group), by itself shows the memristor effect with a retention time of 18 h and persistence of 11 h. Its coordination copolymer with Co(II) ions, [CoU]n, exhibits multimodal resistance changes similar to the synaptic responses observed in biological systems. More than 320 cycles of potentiation and depression measured in continuous sequence occurred without observing a significant current change, confirming the operational stability and reproducibility of the device based on the [CoU]n polymer. The synaptic effect of a device with an indium tin oxide (ITO)/[CoU]n/top-electrode (TE) configuration is more pronounced for the device with TE = Au compared to devices with TE = Al or Ga. However, the latter TEs provide a cost-effective approach without any significant compromise in device plasticity. The detected changes in the synaptic weight, about 12% for pair-pulse facilitation and 80% for its depression, together with a millisecond trigger and reading pulses that decay exponentially on the time scale typical of neurosynapses, justify the device's ability to learn and memorize. These properties offer potential applications in neuromorphic computation and brain-inspired synaptic devices.
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Affiliation(s)
- Ambika Pandey
- Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague, Czech Republic; (A.P.); (Y.R.P.)
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 162 00 Prague, Czech Republic; (A.Š.); (M.K.); (O.K.)
| | - Andrei Chernyshev
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Albertov 6, 128 00 Prague, Czech Republic; (A.C.); (J.Z.)
| | - Yadu Ram Panthi
- Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague, Czech Republic; (A.P.); (Y.R.P.)
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 162 00 Prague, Czech Republic; (A.Š.); (M.K.); (O.K.)
| | - Jiří Zedník
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Albertov 6, 128 00 Prague, Czech Republic; (A.C.); (J.Z.)
| | - Adriana Šturcová
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 162 00 Prague, Czech Republic; (A.Š.); (M.K.); (O.K.)
| | - Magdalena Konefał
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 162 00 Prague, Czech Republic; (A.Š.); (M.K.); (O.K.)
| | - Olga Kočková
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 162 00 Prague, Czech Republic; (A.Š.); (M.K.); (O.K.)
| | - Stephen H. Foulger
- Center for Optical Materials Science and Engineering Technology (COMSET), Department of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USA;
- Department of Bioengineering, Clemson University, Clemson, SC 29634, USA
| | - Jiří Vohlídal
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Albertov 6, 128 00 Prague, Czech Republic; (A.C.); (J.Z.)
| | - Jiří Pfleger
- Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 162 00 Prague, Czech Republic; (A.Š.); (M.K.); (O.K.)
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2
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Lin X, Zhou P, Gao Y, Li T, Chen X, Li H, Jiang R, Chen Z, Zheng H. Implementation of Thermal-Triggered Binary-Ternary Switchable Memory Performance in Zn/polysulfide/organic Complex-Based Memorizers by Finely Modulating the S 62- Relaxation. Inorg Chem 2024; 63:775-783. [PMID: 38134353 DOI: 10.1021/acs.inorgchem.3c03787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2023]
Abstract
Polysulfide-based multilevel memorizers are promising as novel memorizers, in which the occurrence of Sn2- relaxation is key for their multilevel memory. However, the effects of crystal packing and the side group of organic ligands on Sn2- relaxation are still ambiguous. In this work, ionic [Zn(S6)2·Zn2(Bipy)2SO4 (1), Zn(S6)2·Zn(Pmbipy)3 (2)] and neutral [ZnS6(Ombipy) (3), ZnS6(Phen)2 (4)] Zn/polysulfide/organic complexes with different packing modes and structures of organic ligands have been synthesized and were fabricated as memory devices. In both ionic and neutral Zn complexes, the S62- relaxation will be blocked by steric hindrances due to the packing of counter-cations and hydrogen-bond restrictions. Consequently, only the binary memory performances can be seen in FTO/1/Ag, FTO/2/Ag, and FTO/4/Ag, which originate from the more condensed packing of conjugated ligands upon electrical stimulus. Interestingly, FTO/3/Ag illustrates the unique thermally triggered reversible binary-ternary switchable memory performance. In detail, after introducing a methyl group on the 6'-position of bipyridine in ZnS6(Ombipy) (3), the ring-to-chain relaxation of S62- anions at room temperature will be inhibited, but it can happen at a higher temperature of 120 °C, which has been verified by elongated S-S lengths and the strengthened C-H···S hydrogen bond upon heating. The rules drawn in this work will provide a useful guide for the design of stimulus-responsive memorizers that can be applied in special industries such as automobile, oil, and gas industries.
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Affiliation(s)
- Xiaoli Lin
- College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Panke Zhou
- College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Yiqun Gao
- College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Tao Li
- College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Xiong Chen
- College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Haohong Li
- College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Rong Jiang
- College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Zhirong Chen
- College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
| | - Huidong Zheng
- College of Chemistry, Fuzhou University, Fuzhou, Fujian 350108, China
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3
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Kuo KH, Chiu YJ, Hou YC, Lai PT, Chen CY, Tan GH, Lin HW, Wong KT. Tuning Electrochemical Stability of 5,10-Ditolylphenazine-Based Antiaromatic Materials for Unipolar Memristor toward Artificial Synapses Application. ACS APPLIED MATERIALS & INTERFACES 2023; 15:44033-44042. [PMID: 37694918 DOI: 10.1021/acsami.3c07486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
Three organic conjugated small molecules, DTA-DTPZ, Cz-DTPZ, and DTA-me-DTPZ comprising an antiaromatic 5,10-ditolylphenazine (DTPZ) core and electron-donating peripheral substituents with high HOMOs (-4.2 to -4.7 eV) and multiple reversible oxidative potentials are reported. The corresponding films sandwiched between two electrodes show unipolar and switchable hysteresis current-voltage (I-V) characteristics upon voltage sweeping, revealing the prominent features of nonvolatile memristor behaviors. The numerical simulation of the I-V curves suggests that the carriers generated by the oxidized molecules lead to the increment of conductance. However, the accumulated carriers tend to deteriorate the device endurance. The electroactive sites are fully blocked in the dimethylated molecule DTA-me-DTPZ, preventing the irreversible electrochemical reaction, thereby boosting the endurance of the memristor device over 300 cycles. Despite the considerable improvement in endurance, the decrement of on/off ratio from 105 to 101 after 250 cycles suggests that the excessive charge carriers (radical cations) remains a problem. Thus, a new strategy of doping an electron-deficient material, CN-T2T, into the unipolar active layer was introduced to further improve the device stability. The device containing DTA-me-DTPZ:CNT2T (1:1) blend as the active layer retained the endurance and on/off ratio (∼104) upon sweeping 300 cycles. The molecular designs and doping strategy demonstrate effective approaches toward more stable metal-free organic conjugated small-molecule memristors.
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Affiliation(s)
- Kai-Hua Kuo
- Department of Chemistry, National Taiwan University, Taipei10617 ,Taiwan
| | - Yi-Jhen Chiu
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Yu-Che Hou
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Po-Ting Lai
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Cheng-Yueh Chen
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Guang-Hsun Tan
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Hao-Wu Lin
- Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Ken-Tsung Wong
- Department of Chemistry, National Taiwan University, Taipei10617 ,Taiwan
- Institute of Atomic and Molecular Science, Academia Sinica, Taipei 10617, Taiwan
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4
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Sarkar S, Banik H, Rahman FY, Majumdar S, Bhattacharjee D, Hussain SA. Effect of long chain fatty acids on the memory switching behavior of tetraindolyl derivatives. RSC Adv 2023; 13:26330-26343. [PMID: 37671340 PMCID: PMC10476023 DOI: 10.1039/d3ra03869f] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Accepted: 08/18/2023] [Indexed: 09/07/2023] Open
Abstract
Non-volatile memory devices using organic materials have attracted much attention due to their excellent scalability, fast switching speed, low power consumption, low cost etc. Here, we report both volatile as well as non-volatile resistive switching behavior of p-di[3,3'-bis(2-methylindolyl)methane]benzene (Indole2) and its mixture with stearic acid (SA). Previously, we have reported the bipolar resistive switching (BRS) behavior using 1,4-bis(di(1H-indol-3-yl)methyl)benzene (Indole1) molecules under ambient conditions [Langmuir 37 (2021) 4449-4459] and complementary resistive switching (CRS) behavior when the device was exposed to 353 K or higher temperature [Langmuir 38 (2022) 9229-9238]. However, the present study revealed that when the H of -NH group of Indole1 is replaced by -CH3, the resultant Indole2 molecule-based device showed volatile threshold switching behaviour. On the other hand, when Indole2 is mixed with SA at a particular mole fraction, dynamic evolution of an Au/Indole2-SA/ITO device from volatile to non-volatile switching occurred with very good device stability (>285 days), memory window (6.69 × 102), endurance (210 times), data retention (6.8 × 104 s) and device yield of the order of 78.5%. Trap controlled SCLC as well as electric field driven conduction was the key behind the observed switching behaviour of the devices. In the active layer, trap centers due to the SA network may be responsible for non-volatile characteristics of the device. Observed non-volatile switching may be a potential candidate for write once read many (WORM) memory applications in future.
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Affiliation(s)
- Surajit Sarkar
- Thin Film and Nanoscience Laboratory, Department of Physics, Tripura University Suryamaninagar 799022 West Tripura Tripura India
| | - Hritinava Banik
- Thin Film and Nanoscience Laboratory, Department of Physics, Tripura University Suryamaninagar 799022 West Tripura Tripura India
| | - Farhana Yasmin Rahman
- Thin Film and Nanoscience Laboratory, Department of Physics, Tripura University Suryamaninagar 799022 West Tripura Tripura India
| | - Swapan Majumdar
- Department of Chemistry, Tripura University Suryamaninagar 799022 West Tripura Tripura India
| | - Debajyoti Bhattacharjee
- Thin Film and Nanoscience Laboratory, Department of Physics, Tripura University Suryamaninagar 799022 West Tripura Tripura India
| | - Syed Arshad Hussain
- Thin Film and Nanoscience Laboratory, Department of Physics, Tripura University Suryamaninagar 799022 West Tripura Tripura India
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5
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Zhou PK, Lin XL, Chee MY, Lew WS, Zeng T, Li HH, Chen X, Chen ZR, Zheng HD. Switching the memory behaviour from binary to ternary by triggering S 62- relaxation in polysulfide-bearing zinc-organic complex molecular memories. MATERIALS HORIZONS 2023. [PMID: 37070656 DOI: 10.1039/d3mh00037k] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
The use of crystalline metal-organic complexes with definite structures as multilevel memories can enable explicit structure-property correlations, which is significant for designing the next generation of memories. Here, four Zn-polysulfide complexes with different degrees of conjugation have been fabricated as memory devices. ZnS6(L)2-based memories (L = pyridine and 3-methylpyridine) can exhibit only bipolar binary memory performances, but ZnS6(L)-based memories (L = 2,2'-bipyridine and 1,10-phenanthroline) illustrate non-volatile ternary memory performances with high ON2/ON1/OFF ratios (104.22/102.27/1 and 104.85/102.58/1) and ternary yields (74% and 78%). Their ON1 states stem from the packing adjustments of organic ligands upon the injection of carriers, and the ON2 states are a result of the ring-to-chain relaxation of S62- anions. The lower conjugated degrees in ZnS6(L)2 result in less compact packing; consequently, the adjacent S62- rings are too long to trigger the S62- relaxation. The deep structure-property correlation in this work provides a new strategy for implementing multilevel memory by triggering polysulfide relaxation based on the conjugated degree regulation of organic ligands.
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Affiliation(s)
- Pan-Ke Zhou
- Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated Materials, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fujian 350108, China.
| | - Xiao-Li Lin
- Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated Materials, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fujian 350108, China.
| | - Mun Yin Chee
- School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Wen Siang Lew
- School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Tao Zeng
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore
| | - Hao-Hong Li
- Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated Materials, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fujian 350108, China.
| | - Xiong Chen
- Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated Materials, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fujian 350108, China.
| | - Zhi-Rong Chen
- Fujian Provincial Key Laboratory of Advanced Inorganic Oxygenated Materials, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fujian 350108, China.
| | - Hui-Dong Zheng
- Fujian Engineering Research Centre of Advanced Manufacturing Technology for Fine Chemicals, College of Chemical Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China.
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6
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Kamboj N, Betal A, Majumder M, Sahu S, Metre RK. Redox Switching Behavior in Resistive Memory Device Designed Using a Solution-Processable Phenalenyl-Based Co(II) Complex: Experimental and DFT Studies. Inorg Chem 2023; 62:4170-4180. [PMID: 36848532 DOI: 10.1021/acs.inorgchem.2c04264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
We herein report a novel square-planar complex [CoIIL], which was synthesized using the electronically interesting phenalenyl-derived ligand LH2 = 9,9'-(ethane-1,2-diylbis(azanediyl))bis(1H-phenalen-1-one). The molecular structure of the complex is confirmed with the help of the single-crystal X-ray diffraction technique. [CoIIL] is a mononuclear complex where the Co(II) ion is present in the square-planar geometry coordinated by the chelating bis-phenalenone ligand. The solid-state packing of [CoIIL] complex in a crystal structure has been explained with the help of supramolecular studies, which revealed that the π···π stacking present in the [CoIIL] complex is analogous to the one present in tetrathiafulvalene/tetracyanoquinodimethane charge transfer salt, well-known materials for their unique charge carrier interfaces. The [CoIIL] complex was employed as the active material to fabricate a resistive switching memory device, indium tin oxide/CoIIL/Al, and characterized using the write-read-erase-read cycle. The device has interestingly shown a stable and reproducible switching between two different resistance states for more than 2000 s. Observed bistable resistive states of the device have been explained by corroborating the electrochemical characterizations and density functional theory studies, where the role of the CoII metal center and π-conjugated phenalenyl backbone in the redox-resistive switching mechanism is proposed.
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Affiliation(s)
- Nisha Kamboj
- Department of Chemistry, Indian Institute of Technology Jodhpur, Rajasthan 342030, India
| | - Atanu Betal
- Department of Physics, Indian Institute of Technology Jodhpur, Rajasthan 342030, India
| | - Moumita Majumder
- Department of Metallurgical and Materials Engineering, Indian Institute of Technology Jodhpur, Rajasthan 342030, India
| | - Satyajit Sahu
- Department of Physics, Indian Institute of Technology Jodhpur, Rajasthan 342030, India
| | - Ramesh K Metre
- Department of Chemistry, Indian Institute of Technology Jodhpur, Rajasthan 342030, India
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7
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Ghosh S, Ghosh S, Kamilya S, Mandal S, Mehta S, Mondal A. Impact of Counteranion on Reversible Spin-State Switching in a Series of Cobalt(II) Complexes Containing a Redox-Active Ethylenedioxythiophene-Based Terpyridine Ligand. Inorg Chem 2022; 61:17080-17088. [PMID: 36264687 DOI: 10.1021/acs.inorgchem.2c02313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The self-assembly of a redox-active ethylenedioxythiophene (EDOT)-terpyridine-based tridentate ligand and cobalt(II) unit with different counteranions has led to a series of new cobalt(II) complexes [Co(L)2](X)2 (X = BF4 (1), ClO4 (2), and BPh4 (3)) (L = 4'-(3,4-ethylenedioxythiophene)-2,2':6',2″-terpyridine). The impact of various counteranions on stabilization and spin-state switching of the cobalt(II) center was explored through detailed magneto-structural investigation using variable temperature single-crystal X-ray diffraction, magnetic, spectroscopic, electrochemical, and spectroelectrochemical studies. All three complexes 1-3 consisted of an isostructural dicationic distorted octahedral CoN6 coordination environment offered by the two L ligands in a bis-meridional fashion and BF4-, ClO4-, and BPh4- as a counteranion, respectively. Complex 2 with ClO4- counteranion showed a reversible, gradual, and nearly complete spin-state switching between low-spin (LS) (S = 1/2) and high-spin (HS) (S = 3/2) states, while an incomplete spin-state switching behavior was observed for complexes 1 (BF4-) and 3 (BPh4-) in the measured temperature range of 350-2 K. The non-covalent cation-anion interactions played a significant role in stabilizing the spin-state in 1-3. Additionally, complexes 1-3 also exhibited interesting redox-stimuli-based reversible paramagnetic HS cobalt(II) (S = 3/2) to diamagnetic LS cobalt(III) (S = 0) conversion, offering an alternate way to switch the magnetic properties.
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Affiliation(s)
- Subrata Ghosh
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India
| | - Sounak Ghosh
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India
| | - Sujit Kamilya
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India
| | - Subhankar Mandal
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India
| | - Sakshi Mehta
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India
| | - Abhishake Mondal
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Sir C V Raman Road, Bangalore 560012, India
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8
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Lian H, Cheng X, Hao H, Han J, Lau MT, Li Z, Zhou Z, Dong Q, Wong WY. Metal-containing organic compounds for memory and data storage applications. Chem Soc Rev 2022; 51:1926-1982. [PMID: 35083990 DOI: 10.1039/d0cs00569j] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
With the upcoming trend of Big Data era, some new types of memory technologies have emerged as substitutes for the traditional Si-based semiconductor memory devices, which are encountering severe scaling down technical obstacles. In particular, the resistance random access memory (RRAM) and magnetic random access memory (MRAM) hold great promise for the in-memory computing, which are regarded as the optimal strategy and pathway to solve the von Neumann bottleneck by high-throughput in situ data processing. As far as the active materials in RRAM and MRAM are concerned, organic semiconducting materials have shown increasing application perspectives in memory devices due to their rich structural diversity and solution processability. With the introduction of metal elements into the backbone of molecules, some new properties and phenomena will emerge accordingly. Consequently, the RRAM and MRAM devices based on metal-containing organic compounds (including the small molecular metal complexes, metallopolymers, metal-organic frameworks (MOFs) and organic-inorganic-hybrid perovskites (OIHPs)) have been widely explored and attracted intense attention. In this review, we highlight the fundamentals of RRAM and MRAM, as well as the research progress of the applications of metal-containing organic compounds in both RRAM and MRAM. Finally, we discuss the challenges and future directions for the research of organic RRAM and MRAM.
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Affiliation(s)
- Hong Lian
- MOE Key Laboratory of Advanced Display and System Applications, Shanghai University, 149 Yanchang Road, Jingan District, Shanghai 200072, China.,School of Mechanical & Electronic Engineering and Automation, Shanghai University, 99 Shangda Road, Baoshan District, Shanghai 200444, China. .,MOE Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, 79 Yingze West Street, Taiyuan, 030024, China
| | - Xiaozhe Cheng
- MOE Key Laboratory of Advanced Display and System Applications, Shanghai University, 149 Yanchang Road, Jingan District, Shanghai 200072, China.,MOE Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, 79 Yingze West Street, Taiyuan, 030024, China.,Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China.
| | - Haotian Hao
- MOE Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, 79 Yingze West Street, Taiyuan, 030024, China
| | - Jinba Han
- MOE Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, 79 Yingze West Street, Taiyuan, 030024, China
| | - Mei-Tung Lau
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China. .,The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, China
| | - Zikang Li
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China. .,The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, China
| | - Zhi Zhou
- School of Chemistry and Materials Science, Hunan Agricultural University, Changsha 410128, China.
| | - Qingchen Dong
- MOE Key Laboratory of Advanced Display and System Applications, Shanghai University, 149 Yanchang Road, Jingan District, Shanghai 200072, China.,School of Mechanical & Electronic Engineering and Automation, Shanghai University, 99 Shangda Road, Baoshan District, Shanghai 200444, China. .,MOE Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, 79 Yingze West Street, Taiyuan, 030024, China
| | - Wai-Yeung Wong
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, China. .,The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, China
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9
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Pramanik S, Pathak S, Frontera A, Mukhopadhyay S. Syntheses, crystal structures and supramolecular assemblies of two Cu( ii) complexes based on a new heterocyclic ligand: insights into C–H⋯Cl and π⋯π interactions. CrystEngComm 2022. [DOI: 10.1039/d1ce01402a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A new heterocyclic ligand, N3L [4-(1-methylimidazole)-2,6-di(pyrazinyl)pyridine] and two Cu(ii) complexes have been synthesized and characterized by several spectroscopic and DFT methods.
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Affiliation(s)
- Samit Pramanik
- Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Sudipta Pathak
- Department of Chemistry, Haldia Government College, Purba Medinipur, 721657, Debhog, West Bengal, India
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears, Crta. de Valldemossa km 7.5, 07122 Palma de Mallorca, Baleares, Spain
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10
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Poh WC, Au-Yeung HL, Chan AKW, Hong EYH, Cheng YH, Leung MY, Lai SL, Low KH, Yam VWW. Cyclometalated Platinum(II) Complexes with Donor-Acceptor-Containing Bidentate Ligands and Their Application Studies as Organic Resistive Memories. Chem Asian J 2021; 16:3669-3676. [PMID: 34569719 DOI: 10.1002/asia.202100897] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 09/06/2021] [Indexed: 11/10/2022]
Abstract
A series of heteroleptic cyclometalated platinum(II) complexes, [Pt(C^N)(O^O)], (1-10) with various donors and acceptors has been synthesized and characterized by 1 H NMR spectroscopy, elemental analyses, infrared spectroscopy and mass spectrometry. The X-ray structure of 2 has also been determined. The electrochemical and photophysical properties of the platinum(II) complexes were studied. These experimental results have been supported by computational studies. Furthermore, two of the complexes have been employed as the active material in the fabrication of resistive memory devices, exhibiting stable binary memory performance with low operating voltage, high ON/OFF ratio and long retention time.
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Affiliation(s)
- Wei Church Poh
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Ho-Leung Au-Yeung
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Alan Kwun-Wa Chan
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Eugene Yau-Hin Hong
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Yat-Hin Cheng
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Ming-Yi Leung
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Shiu-Lun Lai
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Kam-Hung Low
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Vivian Wing-Wah Yam
- Institute of Molecular Functional Materials and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
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11
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Mukherjee S, Sahoo A, Deb S, Baitalik S. Light and Cation-Driven Optical Switch based on a Stilbene-Appended Terpyridine System for the Design of Molecular-Scale Logic Devices. J Phys Chem A 2021; 125:8261-8273. [PMID: 34506718 DOI: 10.1021/acs.jpca.1c06524] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A molecular system comprising a terpyridine moiety capable of coordinating with different cations and a photoswitchable stilbene unit has been utilized here for the fabrication of multiply configurable logic systems. Incorporation of a substituted stilbene unit into the terpyridine motif generates an intraligand charge-transfer-sensitive module whose absorption and emission spectral properties are highly sensitive to light as well as cations. On the basis of the optical response profile of the receptor in the presence of selected cations as well as light of a specific wavelength, we are able to demonstrate multiple Boolean logic functions such as INHIBIT, IMPLICATION, OR, NOR, and NAND, as well as various combinations of them. Of particular interest, we utilized the present system for the construction of security keypad locks and memory devices by maintaining a proper sequence of the stimuli and monitoring either absorption or emission spectral response at a specific wavelength as the output signal. In addition to various Boolean logic functions, the present system has also the ability to mimic fuzzy logic operations for generating an infinite-valued logic scheme depending on its emission spectral responses upon varying the concentration of cationic (Fe2+ and/or Zn2+) and anionic (CN-) inputs.
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Affiliation(s)
- Shruti Mukherjee
- Inorganic Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Anik Sahoo
- Inorganic Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Sourav Deb
- Inorganic Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata 700032, India
| | - Sujoy Baitalik
- Inorganic Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata 700032, India
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12
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Wang H, Qiu F, Lu C, Zhu J, Ke C, Han S, Zhuang X. A Terpyridine-Fe 2+-Based Coordination Polymer Film for On-Chip Micro-Supercapacitor with AC Line-Filtering Performance. Polymers (Basel) 2021; 13:polym13071002. [PMID: 33805228 PMCID: PMC8037160 DOI: 10.3390/polym13071002] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 03/21/2021] [Accepted: 03/22/2021] [Indexed: 11/16/2022] Open
Abstract
The preparation of redox-active, ultrathin polymer films as the electrode materials represents a major challenge for miniaturized flexible electronics. Herein, we demonstrated a liquid–liquid interfacial polymerization approach to a coordination polymer films with ultrathin thickness from tri(terpyridine)-based building block and iron atoms. The as-synthesized polymer films exhibit flexible properties, good redox-active and narrow bandgap. After directly transferred to silicon wafers, the on-chip micro-supercapacitors of TpPB-Fe-MSC achieved the high specific capacitances of 1.25 mF cm−2 at 50 mV s−1 and volumetric energy density of 5.8 mWh cm−3, which are superior to most of semiconductive polymer-based micro-supercapacitor (MSC) devices. In addition, as-fabricated on-chip MSCs exhibit typical alternating current (AC) line-filtering performance (−71.3° at 120 Hz) and a short resistance–capacitance (RC) time (0.06 ms) with the electrolytes of PVA/LiCl. This study provides a simple interfacial approach to redox-active polymer films for microsized energy storage devices.
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Affiliation(s)
- Hongxing Wang
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Haiquan Road 100, Shanghai 201418, China;
| | - Feng Qiu
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Haiquan Road 100, Shanghai 201418, China;
- Correspondence: (F.Q.); (S.H.); (X.Z.)
| | - Chenbao Lu
- Frontiers Science Center for Transformative Molecules, The Meso-Entropy Matter Lab, The State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; (C.L.); (J.Z.)
| | - Jinhui Zhu
- Frontiers Science Center for Transformative Molecules, The Meso-Entropy Matter Lab, The State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; (C.L.); (J.Z.)
| | - Changchun Ke
- School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
| | - Sheng Han
- School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Haiquan Road 100, Shanghai 201418, China;
- Correspondence: (F.Q.); (S.H.); (X.Z.)
| | - Xiaodong Zhuang
- Frontiers Science Center for Transformative Molecules, The Meso-Entropy Matter Lab, The State Key Laboratory of Metal Matrix Composites, Shanghai Key Laboratory of Electrical Insulation and Thermal Ageing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; (C.L.); (J.Z.)
- Correspondence: (F.Q.); (S.H.); (X.Z.)
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13
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Wu SH, Shao JY, Zhao Z, Ma J, Yang R, Chen N, Tang JH, Bian Z, Zhong YW. Ligand Engineering toward Deep Blue Emission in Nonplanar Terdentate Platinum(II) Complexes. Organometallics 2021. [DOI: 10.1021/acs.organomet.0c00665] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Si-Hai Wu
- School of Medicine, Huaqiao University, Quanzhou, Fujian 362021, People’s Republic of China
| | - Jiang-Yang Shao
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
| | - Zifeng Zhao
- College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
| | - Junjie Ma
- School of Medicine, Huaqiao University, Quanzhou, Fujian 362021, People’s Republic of China
| | - Rong Yang
- School of Medicine, Huaqiao University, Quanzhou, Fujian 362021, People’s Republic of China
| | - Na Chen
- School of Medicine, Huaqiao University, Quanzhou, Fujian 362021, People’s Republic of China
| | - Jian-Hong Tang
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
| | - Zuqiang Bian
- College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, People’s Republic of China
| | - Yu-Wu Zhong
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People’s Republic of China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
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14
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Yang Y, Ma J, He X, Gou G, Mao H, Liu J. Utilization of conformation change and charge trapping to achieve binary/ternary rewritable memory performance of carbazole-based organic molecules. NEW J CHEM 2021. [DOI: 10.1039/d1nj04557a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
To better understand the relationship between the molecular structure and memory characteristics, two carbazole-based organic compounds (Cz-2Ph3F 6FDA and Cz-2TPA 6FDA) with different ratios of electron-donating and electron-withdrawing units were designed and synthesized.
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Affiliation(s)
- Yanhua Yang
- School of Chemistry and Chemical Engineering, Kunming University, Kunming, 650214, P. R. China
- Yunnan Engineering Technology Research Center for Plastic Films, Kunming University, Kunming 650214, P. R. China
| | - Jinwen Ma
- School of Chemistry and Chemical Engineering, Kunming University, Kunming, 650214, P. R. China
| | - Xiujuan He
- School of Chemistry and Chemical Engineering, Kunming University, Kunming, 650214, P. R. China
| | - Gaozhang Gou
- Key Laboratory of Natural Pharmaceutical & Chemical Biology of Yunnan Province, School of Chemistry and Resources Engineering, Honghe University, Mengzi 661100, P. R. China
| | - Huiwu Mao
- Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing 210009, P. R. China
| | - Juqing Liu
- Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing 210009, P. R. China
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15
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Ye Q, Zhang B, Yang Y, Hu X, Shen Y. Binary/ternary memory behavior of organo-solubility polyimides containing flexible imide linkages and pendent triphenylamine or 3, 4, 5-trifluobenzene moieties. Eur Polym J 2020. [DOI: 10.1016/j.eurpolymj.2020.109473] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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16
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Yin H, Yang T, Wang KZ, Tong J, Yu SY. Unusual Photoelectrochemical Properties of Electropolymerized Films of a Triphenylamine-Containing Organic Small Molecule. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:12620-12629. [PMID: 31500421 DOI: 10.1021/acs.langmuir.9b01578] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The electropolymerized films of poly(L)n on an indium-tin oxide (ITO) electrode was prepared by anodic electrooxidation of a dichloromethane solution of a triphenylamine-carrying organic molecule L and were characterized/studied by ultraviolet-visible absorption spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, electrochemical impedance spectroscopy, cyclic voltammetry, and photoelectrochemical measurements. Poly(L)n films were found to show surface-controlled TPA•+1/0 associated quasi-reversible redox and exceptionally high photocurrent generation properties. At a zero external bias potential and under 100 mW/cm2 white light irradiation, a photoelectrochemical device composed of a poly(L)1-modified ITO as the working electode, a platinum disk counter electrode, and saturated calomel electrode reference electrode in a 0.1 M Na2SO4 aqueous solution exhibited a significant cathode photocurrent density of 2.2 μA/cm2, which could be switched to be anodic and outperform most previously reported molecule-based modified ITO electrodes under similar experimental conditions. The results indicate that poly(L)n films offer a number of future perspectives ranging from organic photovoltaic to photoelectrochemical catalysis and sensing.
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Affiliation(s)
- Hong Yin
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry , Beijing Normal University , Beijing 100875 , People's Republic of China
| | - Tong Yang
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry , Beijing Normal University , Beijing 100875 , People's Republic of China
| | - Ke-Zhi Wang
- Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry , Beijing Normal University , Beijing 100875 , People's Republic of China
| | - Jin Tong
- Beijing Key Laboratory for Green Catalysis and Separation, Laboratory for Self-Assembly Chemistry, Department of Chemistry and Chemical Industry, College of Environmental and Energy Engineering , Beijing University of Technology , Beijing 100124 , People's Republic of China
| | - Shu-Yan Yu
- Beijing Key Laboratory for Green Catalysis and Separation, Laboratory for Self-Assembly Chemistry, Department of Chemistry and Chemical Industry, College of Environmental and Energy Engineering , Beijing University of Technology , Beijing 100124 , People's Republic of China
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17
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Shao JY, Cui BB, Tang JH, Zhong YW. Resistive memory switching of transition-metal complexes controlled by ligand design. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.05.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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18
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Zhang Z, Wang H, Shi J, Wang P, Liu C, Wang M, Li X. Stepwise Self-Assembly and Dynamic Exchange of Supramolecular Snowflakes. Isr J Chem 2019; 59:237-247. [PMID: 33833469 DOI: 10.1002/ijch.201800070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Snowflake, a highly symmetrical hexagram figure, is challenging to be expressed by chemistry/supramolecular chemistry due to the complex structure. Herein, we have constructed super snowflake supramolecules using terpyridine (tpy)-based metal-organic building blocks with <tpy-Ru(II)-tpy> and <tpy-Zn(II)-tpy> connectivities through stepwise strategies in high yield. The structures were characterized by multi-dimensional mass spectrometry and multi-dimensional NMR spectrometry. In order to address the stability/tolerance of our designed super snowflake structures, ligand exchange behaviors between different supramolecules with various arm length were fully investigated by mass spectrometry. The study revealed that three modes could exist in such binary systems, including full exchange, partial exchange and self-sorting (no exchange) depending on the length difference of ligands.
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Affiliation(s)
- Zhe Zhang
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Environmental Research at Great Bay, Guangzhou University, Guangzhou 510006, P R. China.,Department of Chemistry, University of South Florida, Tampa 33620, United States.,Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, School of Chemistry, Central China Normal University, Wuhan 430079, P. R. China
| | - Heng Wang
- Department of Chemistry, University of South Florida, Tampa 33620, United States
| | - Junjuan Shi
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P R. China
| | - Pingshan Wang
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Environmental Research at Great Bay, Guangzhou University, Guangzhou 510006, P R. China
| | - Changlin Liu
- Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, School of Chemistry, Central China Normal University, Wuhan 430079, P. R. China
| | - Ming Wang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, P R. China
| | - Xiaopeng Li
- Department of Chemistry, University of South Florida, Tampa 33620, United States
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19
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Yang Y, Xia J, Ding Z, Zheng Y, Ding S, Shen Y. Synthesis and resistive switching characteristics of polyimides derived from 2,7-aryl substituents tetraphenyl fluorene diamines. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2018.08.040] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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20
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Wang L, Liu R, Gu J, Song B, Wang H, Jiang X, Zhang K, Han X, Hao XQ, Bai S, Wang M, Li X, Xu B, Li X. Self-Assembly of Supramolecular Fractals from Generation 1 to 5. J Am Chem Soc 2018; 140:14087-14096. [PMID: 30289702 PMCID: PMC6348470 DOI: 10.1021/jacs.8b05530] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In the seeking of molecular expression of fractal geometry, chemists have endeavored in the construction of molecules and supramolecules during the past few years, while only a few examples were reported, especially for the discrete architectures. We herein designed and constructed five generations of supramolecular fractals (G1-G5) based on the coordination-driven self-assembly of terpyridine ligands. All the ligands were synthesized from triphenylamine motif, which played a central role in geometry control. Different approaches based on direct Sonogashira coupling and/or ⟨tpy-Ru(II)-tpy⟩ connectivity were employed to prepare complex Ru(II)-organic building blocks. Fractals G1-G5 were obtained in high yields by precise coordination of organic or Ru(II)-organic building blocks with Zn(II) ions. Characterization of those architectures were accomplished by 1D and 2D NMR spectroscopy, electrospray ionization mass spectrometry (ESI-MS), traveling-wave ion mobility mass spectrometry (TWIM-MS), and transmission electron microscopy (TEM). Furthermore, the two largest fractals also hierarchically self-assemble into ordered supramolecular nanostructures either at solid/liquid interface or in solution on the basis of their well-defined scaffolds.
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Affiliation(s)
- Lei Wang
- Department of Chemistry , University of South Florida , Tampa , Florida 33620 , United States
| | - Ran Liu
- Shandong Province Key Laboratory of Medical Physics and Image Processing Technology, School of Physics and Electronics , Shandong Normal University , Jinan 250358 , China
- Single Molecule Study Laboratory, College of Engineering and Nanoscale Science and Engineering Center , University of Georgia , Athens , Georgia 30602 , United States
| | - Jiali Gu
- College of Chemistry, Chemical Engineering and Materials Science , Soochow University , Suzhou 215123 , China
| | - Bo Song
- Department of Chemistry , University of South Florida , Tampa , Florida 33620 , United States
| | - Heng Wang
- Department of Chemistry , University of South Florida , Tampa , Florida 33620 , United States
| | - Xin Jiang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry , Jilin University , Changchun , Jilin 130012 , China
| | - Keren Zhang
- Single Molecule Study Laboratory, College of Engineering and Nanoscale Science and Engineering Center , University of Georgia , Athens , Georgia 30602 , United States
| | - Xin Han
- College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou , Henan 450001 , China
| | - Xin-Qi Hao
- College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou , Henan 450001 , China
| | - Shi Bai
- Department of Chemistry and Biochemistry , University of Delaware , Newark , Delaware 19716 , United States
| | - Ming Wang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry , Jilin University , Changchun , Jilin 130012 , China
| | - Xiaohong Li
- College of Chemistry, Chemical Engineering and Materials Science , Soochow University , Suzhou 215123 , China
| | - Bingqian Xu
- Single Molecule Study Laboratory, College of Engineering and Nanoscale Science and Engineering Center , University of Georgia , Athens , Georgia 30602 , United States
| | - Xiaopeng Li
- Department of Chemistry , University of South Florida , Tampa , Florida 33620 , United States
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21
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Schnaubelt L, Petzold H, Dmitrieva E, Rosenkranz M, Lang H. A solvent- and temperature-dependent intramolecular equilibrium of diamagnetic and paramagnetic states in Co complexes bearing triaryl amines. Dalton Trans 2018; 47:13180-13189. [PMID: 30178800 DOI: 10.1039/c8dt02538j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Complexes [Co(L)2](ClO4)2 (L = o-substituted 2-(pyridine-2-yl)-1,10-phenanthrolines 1a-c) containing three redox active centres (a Co2+ ion and two triaryl amine (Tara) units) have been synthesised. The order of oxidation steps in [Co(L)2](ClO4)2 (L = 1a-c) was determined using cyclic voltammetry and EPR/UV-vis-NIR spectroelectrochemistry. In acetonitrile solutions, at room temperature, the first oxidation is Co-centred followed by the Tara oxidation at more anodic potentials. The order of oxidation is inverted in solutions of the less polar solvent dichloromethane. The Co3+/2+-centred redox event leads to a spin transition between the paramagnetic high-spin (HS) Co2+ and the diamagnetic low-spin (LS) Co3+ state, which was proven using 1H NMR and EPR spectroscopy. After one-electron oxidation of [Co(L)2](ClO4)2, an equilibrium between the diamagnetic [Co3+(L)]3+ and paramagnetic [Co2+(L)(L+)]3+ state in [Co(L)2]3+ (L = 1a-c) was found. Cyclic voltammetry showed enhanced intermolecular electron transfer between the [Co2+(L)2]2+ and [Co3+(L)2]3+ redox states mediated by [Co2+(L)(L+)]3+. Variable temperature vis-NIR spectroscopy of in situ generated [Co(L)2]3+ revealed a temperature-dependent redox equilibrium between the [Co3+(L)2]3+ and the [Co2+(L+)(L)]3+ states (L = 1a-c). Magnetic coupling between the HS-Co2+ ion and the Tara+ radical in [HS-Co2+(L+)(L)]3+ (L = 1a,c) was deduced from broad and undetectable lines observed in the corresponding EPR spectra. Complete oxidation to [LS-Co3+(L+)2]5+ (L = 1a,c) leads to characteristic EPR spectra of Tara biradicals with non-interacting spins.
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Affiliation(s)
- Linda Schnaubelt
- Technische Universität Chemnitz, Faculty of Natural Sciences, Institute of Chemistry, Inorganic Chemistry, 09107 Chemnitz, Germany.
| | - Holm Petzold
- Technische Universität Chemnitz, Faculty of Natural Sciences, Institute of Chemistry, Inorganic Chemistry, 09107 Chemnitz, Germany.
| | - Evgenia Dmitrieva
- Center of Spectroelectrochemistry, Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany
| | - Marco Rosenkranz
- Center of Spectroelectrochemistry, Leibniz Institute for Solid State and Materials Research (IFW Dresden), Helmholtzstraße 20, 01069 Dresden, Germany
| | - Heinrich Lang
- Technische Universität Chemnitz, Faculty of Natural Sciences, Institute of Chemistry, Inorganic Chemistry, 09107 Chemnitz, Germany.
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