1
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Bae HS, Ahn DH, Song JW. Why Does the Optimal Tuning Method of the Range Separation Parameter of a Long-Range Corrected Density Functional Fail in Intramolecular Charge Transfer Excitation Calculations? Molecules 2024; 29:4423. [PMID: 39339418 PMCID: PMC11434625 DOI: 10.3390/molecules29184423] [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: 08/19/2024] [Revised: 09/11/2024] [Accepted: 09/13/2024] [Indexed: 09/30/2024] Open
Abstract
We performed intra- and intermolecular charge transfer (CT) excitation energy calculations of (a) conjugated carbon chain [H2N-(CH=CH)n-X] and (b) its equidistant H2NH∙∙∙HX (n = 2~8) with various electron acceptors (X = NH2, OH, Cl, CHO, CN, and NO2) using EOM-CCSD, time-dependent (TD) Hartree-Fock (HF) and various density functional theory (DFT) functionals, such as BLYP, B3LYP, long-range corrected (LC) DFT, and LC-DFT with an optimally tuned (OT) range separation parameter (µ) using Koopman's theorem to investigate the effect of the electron-withdrawing (or -donating) strength of end-capped functional group (X) and CT distance (R) on intra- and intermolecular CT excitation energies. As the electron-withdrawing strength of X increases, both intra- and intermolecular CT excitation energies tend to decrease, since energy gaps between orbitals corresponding to CT excitations (e.g., HOMO and LUMO) decrease. However, the effect of the electron-withdrawing group on intramolecular CT excitation energy is negligible (at most 0.5 eV). OT-LC-DFT shows accurate intermolecular CT excitation energy, but worse results in intramolecular CT excitation energy than LC-DFT with the default µ value (0.47). Therefore, we conclude that the optimal tuning method is not effective in predicting intramolecular CT excitation energy. While intermolecular CT excitation energy has excitonic binding energy with asymptotic behavior to CT distance that is not affected by the choice of range separation parameter, intramolecular CT excitation energy is affected by orbital relaxation energy, which strongly depends on the choice of range separation parameter, which makes the OT method of range separation parameter ineffective in predicting intramolecular CT excitation energy as well as local excitation with high accuracy.
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Affiliation(s)
| | | | - Jong-Won Song
- Department of Chemistry Education, Daegu University, Gyeongsan-si 113-8656, Republic of Korea; (H.-S.B.); (D.-H.A.)
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2
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Tsuneda T, Taketsugu T. Singlet Fission as the Gateway to Triplet Generation in Heavy Atom-Free Organic Molecules. J Phys Chem Lett 2024; 15:6676-6684. [PMID: 38899775 DOI: 10.1021/acs.jpclett.4c00726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/21/2024]
Abstract
Triplet generations in heavy atom-free organic molecules are primarily revealed to proceed through singlet fissions (SFs) by investigating the contributions of SFs and intersystem crossings to the generation rates. The spin-flip long-range corrected time-dependent density functional theory calculations on 11 organic molecules known for triplet generation under photoirradiation are performed. The correlation between the descriptors for SF and the experimental singlet-to-triplet conversion rates strongly supports the predominance of SF progressions in all these molecules, corroborated by experimental observations of their triplet-triplet annihilations. Based on these findings, we propose updated conditions for SF progression: There is a high-absorption singlet state just above the triplet-triplet excitation of the chromophore dimer, or the singlet (triplet-triplet) excitation itself is responsible for photoabsorption. To the best of our knowledge, all organic molecules known for rapid triplet state generation fulfill these conditions.
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Affiliation(s)
- Takao Tsuneda
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
- Graduate School of System Informatics, Kobe University, Nada-ku, Kobe, Hyogo 657-8501, Japan
| | - Tetsuya Taketsugu
- 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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3
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Vu Nhat P, Duy NVA, Tran TN, Si NT, Nguyen TA, To Van N, Van Nghia N, Schall P, Dinh VA, Dang MT. Optoelectronic Properties of Nitrogen-Doped Hexagonal Graphene Quantum Dots: A First-Principles Study. ACS OMEGA 2024; 9:20056-20065. [PMID: 38737018 PMCID: PMC11079900 DOI: 10.1021/acsomega.3c10501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 04/11/2024] [Accepted: 04/11/2024] [Indexed: 05/14/2024]
Abstract
Graphene quantum dots have been widely studied owing to their unique optical, electrical, and optoelectrical properties for various applications in solar devices. Here, we investigate the optoelectronic properties of hexagonal and nitrogen-doped graphene quantum dots using the first-principles method. We find that doping nitrogen atoms to hexagonal graphene quantum dots results in a significant red shift toward the visible light range as compared to that of the pristine graphene quantum dots, and the doped nitrogen atoms also induce a clear signature of anisotropy of the frontier orbitals induced by the electron correlation between the doped nitrogen atoms and their adjacent carbon atoms. Moreover, time-dependent density functional theory calculations with the M06-2X functional and 6-311++G(d,p) basis set reproduce well the experimental absorption spectra reported recently. These results provide us with a novel approach for more systematic investigations on next-generation solar devices with assembled quantum dots to improve their light selectivity as well as efficiency.
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Affiliation(s)
- Pham Vu Nhat
- Can
Tho University, 3-2 Road, Can Tho 900000, Vietnam
| | - Nguyen Vo Anh Duy
- FPT
University, Can Tho Campus, 600 Nguyen Van Cu Street, Ninh Kieu, Can Tho 900000, Vietnam
| | - Thi Nhan Tran
- Faculty
of Fundamental Sciences, Hanoi University
of Industry, 298 Cau Dien Road, Hanoi 100000, Vietnam
| | - Nguyen Thanh Si
- Institute
of Environmental Science and Technology, Tra Vinh University, Tra Vinh 94000, Vietnam
| | - Truc Anh Nguyen
- Faculty
of Mechanics, Can Tho University of Technology, 256 Nguyen Van Cu Street, Can Tho 900000, Vietnam
| | - Nguyen To Van
- Faculty of
Chemico-Physical Engineering, Le Quy Don
Technical University, Ha Noi 100000, Vietnam
| | - Nguyen Van Nghia
- Open
Training Institute, Hanoi Architectural
University, Km10, Nguyen Trai Street, Hanoi 100000, Vietnam
| | - Peter Schall
- Van
der Waals-Zeeman Institute, University of
Amsterdam, Science Park
904, Amsterdam 1098 XH, The Netherlands
| | - Van An Dinh
- Department
of Precision Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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4
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Tsuneda T, Taketsugu T. Singlet fission initiating organic photosensitizations. Sci Rep 2024; 14:829. [PMID: 38191637 PMCID: PMC10774408 DOI: 10.1038/s41598-023-50860-4] [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: 05/02/2023] [Accepted: 12/27/2023] [Indexed: 01/10/2024] Open
Abstract
The feasibility of singlet fission (SF) in organic photosensitizers is investigated through spin-flip long-range corrected time-dependent density functional theory. This study focuses on four major organic photosensitizer molecules: benzophenone, boron-dipyrromethene, methylene blue, and rose bengal. Calculations demonstrate that all these molecules possess moderate [Formula: see text]-stacking energies and closely-lying singlet (S) and quintet (triplet-triplet, TT) excitations, satisfying the essential conditions for SF: (1) Near-degenerate low-lying S and (TT) excitations with a significant S-T energy gap, and (2) Moderate [Formula: see text]-stacking energy of chromophores, slightly higher than solvation energy, enabling dissociation for triplet-state chromophore generation. Moreover, based on the El-Sayed rule, intersystem crossing is found to simultaneously proceed at very slow rates in all these photosensitizers. This is attributed to the fact that the lowest singlet excitation of the monomers partly involves [Formula: see text] transitions alongside the main [Formula: see text] transitions. The proposed mechanisms are strongly substantiated by comparisons with experimental studies.
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Affiliation(s)
- Takao Tsuneda
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan.
- Graduate School of Science Technology and Innovation, Kobe University, Nada-ku, Kobe, Hyogo, 657-8501, Japan.
| | - Tetsuya Taketsugu
- 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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5
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Tsuneda T, Taketsugu T. Roles of Singlet Fission in the Photosensitization of Silicon Phthalocyanine. J Phys Chem Lett 2023; 14:11587-11596. [PMID: 38100084 DOI: 10.1021/acs.jpclett.3c02921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
The roles of singlet fission in the triplet generation of silicon phthalocyanine (SiPc), a compound analogous to the IRDye700DX photosensitizer used in near-infrared photoimmunotherapy, are investigated by considering the energetical relation between the excitations of this compound. These excitations are obtained through spin-flip long-range corrected time-dependent density functional theory calculations. To initiate singlet fission, chromophores must meet two conditions: (1) near-degenerate low-lying singlet and quintet (triplet-triplet) excitations with a considerable energy gap of the lowest singlet and triplet excited states and (2) moderate π-stacking energy of chromophores, which is higher than but not far from the solvation energy, to facilitate the dissociation and generation of triplet-state chromophores. The present calculations demonstrate that SiPc satisfies both of these conditions after the formation of π-stacking irrespective of the presence of an axial ligand(s), suggesting that singlet fission plays a crucial role in the triplet generation process, although intersystem crossing occurs simultaneously at a very slow rate.
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Affiliation(s)
- Takao Tsuneda
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan
- Graduate School of Science Technology and Innovation, Kobe University, Nada-ku, Kobe, Hyogo 657-8501, Japan
| | - Tetsuya Taketsugu
- 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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6
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Pandey AN, Taketsugu T, Singh RK. Theoretical investigation of copper clusters using the electron propagator theory. J CHEM SCI 2023. [DOI: 10.1007/s12039-023-02146-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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7
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Tsuneda T, Taketsugu T. Singlet fission initiating triplet generations of BODIPY derivatives through [Formula: see text]-stacking: a theoretical study. Sci Rep 2022; 12:19714. [PMID: 36385479 PMCID: PMC9668823 DOI: 10.1038/s41598-022-23370-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Accepted: 10/31/2022] [Indexed: 11/17/2022] Open
Abstract
The role of singlet fission (SF) in the triplet-state generation mechanism of 1,3,5,7-tetramethyl-boron-dipyrromethene derivatives is revealed by exploring the cause for the solvent dependence of the generation rate. Comparing the adsorption energy calculations of solvent molecules, i.e., cyclohexane, chloroform and acetonitrile molecules, to the derivatives with the [Formula: see text]-stacking energies of these derivatives surprisingly show that the hierarchy of the solvation energies and [Formula: see text]-stacking energies strongly correlates with the experimentally-suggested solvent dependence of the triplet-state generation of these derivatives for five and more adsorbing solvent molecules. Following this finding, the excitation spectra of these derivatives in acetonitrile solvent are explored using the proprietary spin-flip long-range corrected time-dependent density functional theory. It is, consequently, confirmed that the [Formula: see text]-stacking activates the second lowest singlet excitation to trigger the spin-allowed transition to the singlet doubly-excited tetraradical (TT)[Formula: see text] state, which generates the long-lived quintet (TT)[Formula: see text] state causing the SF. However, it is also found that the [Formula: see text]-stacking also get a slow intersystem crossing active around the intersections of the lowest singlet excitations with the lowest triplet T[Formula: see text] excitations in parallel with the SF due to the charge transfer characters of the lowest singlet excitations. These results suggest that SF initiates the triplet-state generations through near-degenerate low-lying singlet and (TT) excitations with a considerable singlet-triplet energy gap after the [Formula: see text]-stacking of chromophores stronger than but not far from the solvation. Since these derivatives are organic photosensitizers, this study proposes that SF should be taken into consideration in developing novel heavy atom-free organic photosensitizers, which will contribute to a variety of research fields such as medical care, photobiology, energy science, and synthetic chemistry.
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Affiliation(s)
- Takao Tsuneda
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810 Japan
- Graduate School of Science Technology and Innovation, Kobe University, Nada-ku, Kobe, Hyogo 657-8501 Japan
| | - Tetsuya Taketsugu
- 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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8
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Song JW, Hirao K. Is charge-transfer excitation through a polyalkane single-bond chain an intramolecular charge-transfer?: EOM-CCSD and LC-BOP study. Chem Phys Lett 2022. [DOI: 10.1016/j.cplett.2022.139563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Si NT, Nhung NTA, Bui TQ, Nguyen MT, Nhat PV. Gold nanoclusters as prospective carriers and detectors of pramipexole. RSC Adv 2021; 11:16619-16632. [PMID: 35479146 PMCID: PMC9031969 DOI: 10.1039/d1ra02172a] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 04/27/2021] [Indexed: 02/06/2023] Open
Abstract
Pramipexole (PPX) is known in the treatment of Parkinson's disease and restless legs syndrome. We carried out a theoretical investigation on pramipexole-Au cluster interactions for the applications of drug delivery and detection. Three Au N clusters with sizes N = 6, 8 and 20 were used as reactant models to simulate the metallic nanostructured surfaces. Quantum chemical computations were performed in both gas phase and aqueous environments using density functional theory (DFT) with the PBE functional and the cc-pVDZ-PP/cc-pVTZ basis set. The PPX drug is mainly adsorbed on gold clusters via its nitrogen atom of the thiazole ring with binding energies of ca. -22 to -28 kcal mol-1 in vacuum and ca. -18 to -24 kcal mol-1 in aqueous solution. In addition to such Au-N covalent bonding, the metal-drug interactions are further stabilized by electrostatic effects, namely hydrogen-bond NH⋯Au contributions. Surface-enhanced Raman scattering (SERS) of PPX adsorbed on the Au surfaces and its desorption process were also examined. In comparison to Au8, both Au6 and Au20 clusters undergo a shorter recovery time and a larger change of energy gap, being possibly conducive to electrical conversion, thus signaling for detection of the drug. A chemical enhancement mechanism for SERS procedure was again established in view of the formation of nonconventional hydrogen interactions Au⋯H-N. The binding of PPX to a gold cluster is expected to be reversible and triggered by the presence of cysteine residues in protein matrices or lower-shifted alteration of environment pH. These findings would encourage either further theoretical probes to reach more accurate views on the efficiency of pramipexole-Au interactions, or experimental attempts to build appropriate gold nanostructures for practical trials, harnessing their potentiality for applications.
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Affiliation(s)
- Nguyen Thanh Si
- Computational Chemistry Research Group, Ton Duc Thang University Ho Chi Minh City Vietnam
- Faculty of Applied Sciences, Ton Duc Thang University Ho Chi Minh City Vietnam
| | | | - Thanh Q Bui
- Department of Chemistry, University of Sciences, Hue University Hue Vietnam
| | - Minh Tho Nguyen
- Institute for Computational Science and Technology (ICST) Ho Chi Minh City Vietnam
| | - Pham Vu Nhat
- Department of Chemistry, Can Tho University Can Tho Vietnam
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10
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Nhat PV, Si NT, Tram NTT, Duong LV, Nguyen MT. Elucidating the binding mechanism of thione-containing mercaptopurine and thioguanine drugs to small gold clusters. J Comput Chem 2020; 41:1748-1758. [PMID: 32357385 DOI: 10.1002/jcc.26216] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Revised: 04/10/2020] [Accepted: 04/13/2020] [Indexed: 12/21/2022]
Abstract
Density functional theory methods were employed to clarify the adsorption/desorption behaviors of the thione-containing mercaptopurine and thioguanine drugs on the gold surface using both small Au6 and Au8 clusters as model reactants. Structural features, thermodynamic parameters, bonding characteristics, and electronic properties of the resulting complexes were investigated using the Perdew-Burke-Ernzerhof (PBE) and LC-BLYP functionals along with correlation-consistent basis sets, namely cc-pVDZ-PP for gold and cc-pVTZ for non-metals. Computed results show that the drug molecules tend to anchor on the gold cluster at the S atom with binding energies around -34 to -40 kcal/mol (in vacuum) and - 28 to -32 kcal/mol (in aqueous solution). As compared to Au8 , Au6 undergoes a shorter recovery time and a larger change of energy gap that could be converted to an electrical signal for selective detection of the drugs. Furthermore, interactions between the drugs and gold clusters are reversible processes and a drug release mechanism was also proposed. Accordingly, the drugs are able to separate from the gold surface due to either a slight change of pH in tumor cells or the presence of cysteine residues in protein matrices.
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Affiliation(s)
- Pham Vu Nhat
- Department of Chemistry, Can Tho University, Can Tho, Vietnam
| | - Nguyen Thanh Si
- Computational Chemistry Research Group, Ton Duc Thang University, Ho Chi Minh City, Vietnam.,Department of Chemistry, Can Tho University, Can Tho, Vietnam
| | - Nguyen Thi Thu Tram
- Department of Chemistry, Can Tho University of Medicine and Pharmacy, Can Tho, Vietnam
| | - Long Van Duong
- Laboratory of Molecular Science and Nanomaterials, Institute for Computational Science and Technology, Ho Chi Minh City, Vietnam
| | - Minh Tho Nguyen
- Computational Chemistry Research Group, Ton Duc Thang University, Ho Chi Minh City, Vietnam.,Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Vietnam
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11
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Nhat PV, Si NT, Nguyen MT. Structural Evolution and Stability Trend of Small-Sized Gold Clusters Au n ( n = 20-30). J Phys Chem A 2020; 124:1289-1299. [PMID: 31990548 DOI: 10.1021/acs.jpca.9b09287] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Structural evolution and stability pattern of pure neutral gold clusters Aun in the small size range of n = 20-30 are examined using density functional theory (DFT) calculations. The equilibrium geometries are either confirmed or determined, and some new ground state structures are identified. The most stable configurations of Au21-Au23 sizes are formed by adding extra gold atoms to the highly stable pyramidal structure of Au20, while flat-cage shapes are the best candidates for the global minima of both Au24 and Au25. For larger sizes of n = 26-30, pyramidal motifs tend to dominate the lower-lying population rather than tubular conformations as previously reported. The energy gaps, excitation energies, and exciton binding energies are also computed to test out the performance of the computational methods employed. Accordingly, a density functional with long-range exchange effects is highly recommended to quantitatively investigate both the ground and excited states of pure gold clusters.
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Affiliation(s)
- Pham Vu Nhat
- Department of Chemistry , Can Tho University , Can Tho , 900100 , Vietnam
| | - Nguyen Thanh Si
- Computational Chemistry Research Group , Ton Duc Thang University , Ho Chi Minh City , 700000 , Vietnam.,Department of Chemistry , Can Tho University , Can Tho , 900100 , Vietnam
| | - Minh Tho Nguyen
- Computational Chemistry Research Group , Ton Duc Thang University , Ho Chi Minh City , 700000 , Vietnam.,Faculty of Applied Sciences , Ton Duc Thang University , Ho Chi Minh City , 700000 , Vietnam
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12
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Qiu CS, Flinn C, Zhao Y. Molecular structure and electronic properties of substituted tetrabenzocoronenes: DFT and TD‐DFT investigations. J PHYS ORG CHEM 2019. [DOI: 10.1002/poc.3970] [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)
- Christopher S. Qiu
- Department of ChemistryMemorial University of Newfoundland St. John's Newfoundland and Labrador Canada
| | - Christopher Flinn
- Department of ChemistryMemorial University of Newfoundland St. John's Newfoundland and Labrador Canada
| | - Yuming Zhao
- Department of ChemistryMemorial University of Newfoundland St. John's Newfoundland and Labrador Canada
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13
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Shi B, Nachtigallová D, Aquino AJA, Machado FBC, Lischka H. High-level theoretical benchmark investigations of the UV-vis absorption spectra of paradigmatic polycyclic aromatic hydrocarbons as models for graphene quantum dots. J Chem Phys 2019; 150:124302. [DOI: 10.1063/1.5086760] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Baimei Shi
- School of Pharmaceutical Sciences and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
| | - Dana Nachtigallová
- Institute of Organic Chemistry and Biochemistry v.v.i., The Czech Academy of Sciences, Flemingovo nám. 2, 16610 Prague 6, Czech Republic
- Regional Centre of Advanced Technologies and Materials, Palacký University, 78371 Olomouc, Czech Republic
| | - Adélia J. A. Aquino
- School of Pharmaceutical Sciences and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
| | - Francisco B. C. Machado
- Departamento de Química, Instituto Tecnológico de Aeronáutica, São José dos Campos, São Paulo 12228-900, Brazil
| | - Hans Lischka
- School of Pharmaceutical Sciences and Technology, Tianjin University, Tianjin 300072, People’s Republic of China
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14
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Tsuneda T. Theoretical investigations on geometrical and electronic structures of silver clusters. J Comput Chem 2018; 40:206-211. [DOI: 10.1002/jcc.25577] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 08/10/2018] [Accepted: 08/11/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Takao Tsuneda
- Fuel Cell Nanomaterials Center; University of Yamanashi; Kofu 400-0021 Japan
- Department of Chemistry; Faculty of Science, Hokkaido University; Sapporo 060-0810 Japan
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15
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Vikramaditya T, Chai JD, Lin ST. Impact of non-empirically tuning the range-separation parameter of long-range corrected hybrid functionals on ionization potentials, electron affinities, and fundamental gaps. J Comput Chem 2018; 39:2378-2384. [DOI: 10.1002/jcc.25575] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2018] [Revised: 07/16/2018] [Accepted: 07/26/2018] [Indexed: 02/02/2023]
Affiliation(s)
- Talapunur Vikramaditya
- Department of Chemical Engineering; National Taiwan University; No. 1, Sec. 4, Roosevelt Road, Taipei 10617 Taiwan
| | - Jeng-Da Chai
- Department of Physics; National Taiwan University; No. 1, Sec. 4, Roosevelt Road, Taipei 10617 Taiwan
| | - Shiang-Tai Lin
- Department of Chemical Engineering; National Taiwan University; No. 1, Sec. 4, Roosevelt Road, Taipei 10617 Taiwan
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16
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Arhangelskis M, Jochym DB, Bernasconi L, Friščić T, Morris AJ, Jones W. Time-Dependent Density-Functional Theory for Modeling Solid-State Fluorescence Emission of Organic Multicomponent Crystals. J Phys Chem A 2018; 122:7514-7521. [DOI: 10.1021/acs.jpca.8b03481] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mihails Arhangelskis
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
- Department of Chemistry, McGill University, 801 Sherbrooke Street W., Montreal H3A 0B8, Québec, Canada
| | - Dominik B. Jochym
- STFC Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | | | - Tomislav Friščić
- Department of Chemistry, McGill University, 801 Sherbrooke Street W., Montreal H3A 0B8, Québec, Canada
| | - Andrew J. Morris
- School of Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - William Jones
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
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17
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18
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Singh RK, Iwasa T, Taketsugu T. Insights into geometries, stabilities, electronic structures, reactivity descriptors, and magnetic properties of bimetallic Ni m Cu n-m (m = 1, 2; n = 3-13) clusters: Comparison with pure copper clusters. J Comput Chem 2018; 39:1878-1889. [PMID: 29799132 DOI: 10.1002/jcc.25361] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 04/25/2018] [Accepted: 04/28/2018] [Indexed: 11/08/2022]
Abstract
A long-range corrected density functional theory (LC-DFT) was applied to study the geometric structures, relative stabilities, electronic structures, reactivity descriptors and magnetic properties of the bimetallic NiCun-1 and Ni2 Cun-2 (n = 3-13) clusters, obtained by doping one or two Ni atoms to the lowest energy structures of Cun , followed by geometry optimizations. The optimized geometries revealed that the lowest energy structures of the NiCun-1 and Ni2 Cun-2 clusters favor the Ni atom(s) situated at the most highly coordinated position of the host copper clusters. The averaged binding energy, the fragmentation energies and the second-order energy differences signified that the Ni doped clusters can continue to gain an energy during the growth process. The electronic structures revealed that the highest occupied molecular orbital and the lowest unoccupied molecular orbital energies of the LC-DFT are reliable and can be used to predict the vertical ionization potential and the vertical electron affinity of the systems. The reactivity descriptors such as the chemical potential, chemical hardness and electrophilic power, and the reactivity principle such as the minimum polarizability principle are operative for characterizing and rationalizing the electronic structures of these clusters. Moreover, doping of Ni atoms into the copper clusters carry most of the total spin magnetic moment. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Raman K Singh
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto, 615-8245, Japan.,Department of Chemistry, Jagdam College, Chapra Jai Prakash University, Chapra, Bihar, 841301, India
| | - Takeshi Iwasa
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto, 615-8245, Japan.,Faculty of Science, Department of Chemistry, Hokkaido University, Sapporo, Hokkaido, 060-0810, Japan
| | - Tetsuya Taketsugu
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto, 615-8245, Japan.,Faculty of Science, Department of Chemistry, Hokkaido University, Sapporo, Hokkaido, 060-0810, Japan
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