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Fatková K, Cajzl R, Burda JV. The vertical excitation energies and a lifetime of the two lowest singlet excited states of the conjugated polyenes from C2 to C22: Ab initio, DFT, and semiclassical MNDO-MD simulations. J Comput Chem 2023; 44:777-787. [PMID: 36444915 DOI: 10.1002/jcc.27040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 10/04/2022] [Accepted: 10/17/2022] [Indexed: 12/03/2022]
Abstract
Electronic excited states in the series of polyene molecules were explored. Optimal ground-state geometry was used for the evaluation of vertical excitation energies. Results of a chosen set of functionals were compared to post-HF methods (EOM-CCSD, NEVPT2, CASPT2, and MRCI). In addition, the semiempirical OM2/MNDO method using MRCISD computational level was confronted with the above-mentioned techniques. Despite the fact that the first excited state has a significant double-excitation character some functionals were able to qualitatively determine the correct state order (where the lowest excited state has a A g - character). The most successful functionals in transition energies predictions were PBE, TPSS and BLYP in Tamm-Dancoff approach (TDA), which had the smallest root-mean-square deviation (RMSD) scoring towards the experimental values. Regarding RMSD scoring, the OM2/MNDO method performed fairly well, too. Besides absorption spectra, lifetimes of the first two excited states were estimated based on a stochastic approach exploring a swarm of OM2/MNDO hopping dynamics using the Tully fewest switch algorithm for each molecule. The longest lifetime of the first excited state (S1 ) was found for decapentaene (about 5 ps). Further elongation of the conjugated chain caused a mild decrease of this value to ca 1.5 ps for docosaundecaene.
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Affiliation(s)
- Kateřina Fatková
- Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
| | - Radim Cajzl
- Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
| | - Jaroslav V Burda
- Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
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Angelova S, Nikolova V, Pereva S, Spassov T, Dudev T. α-Cyclodextrin: How Effectively Can Its Hydrophobic Cavity Be Hydrated? J Phys Chem B 2017; 121:9260-9267. [PMID: 28885027 DOI: 10.1021/acs.jpcb.7b04501] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Cyclodextrins (CDs) are among the most widely used native host systems with ability to form inclusion complexes with various molecular objects. This ability is so strong that the "hydrophobic" CD cavity never remains empty, even in the guest-free state it is filled with water molecules. However, no consensus has been reached concerning both the total number of hydrating water molecules and their preferred binding location in the CDs. Several outstanding questions regarding the CD hydration still wait to be answered: (1) Which spots of the CD cavity ("hot spots") have the highest affinity for the guest water molecules? (2) How stable are water clusters inside the cavity? (3) Which mode of water binding, sequential or bulk, is thermodynamically more favored? (4) What is the upper limit of the number of water molecules bound inside the host cavity? (5) What factors do control the CD hydration process? Here, using αCD as a typical representative of the cyclodextrin family, we endeavor to answer these questions by combining experimental measurements (differential scanning calorimetry and thermogravimetry) with theoretical (DFT) calculations. Enthalpies of the αCD hydrate formation are evaluated and the role of different factors, such as the number and mode of binding (sequential vs bulk) of water molecules, type of hydrogen bonds established (water-water vs water-αCD), and the dielectric properties of the medium, on the complexation process is assessed. The results obtained shed light on the intimate mechanism of water binding to αCD and disclose the key factors governing the process.
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Affiliation(s)
- Silvia Angelova
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences , 1113 Sofia, Bulgaria
| | - Valya Nikolova
- Faculty of Chemistry and Pharmacy, Sofia University "St. Kl. Ohridski" , 1164 Sofia, Bulgaria
| | - Stiliyana Pereva
- Faculty of Chemistry and Pharmacy, Sofia University "St. Kl. Ohridski" , 1164 Sofia, Bulgaria
| | - Tony Spassov
- Faculty of Chemistry and Pharmacy, Sofia University "St. Kl. Ohridski" , 1164 Sofia, Bulgaria
| | - Todor Dudev
- Faculty of Chemistry and Pharmacy, Sofia University "St. Kl. Ohridski" , 1164 Sofia, Bulgaria
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Acosta-Gutiérrez S, Hernández-Rojas J, Bretón J, Llorente JMG, Wales DJ. Physical properties of small water clusters in low and moderate electric fields. J Chem Phys 2012; 135:124303. [PMID: 21974518 DOI: 10.1063/1.3640804] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Likely candidates for the lowest minima of water clusters (H(2)O)(N) for N ≤ 20 interacting with a uniform electric field strength in the range E ≤ 0.6 V/Å have been identified using basin-hopping global optimization. Two water-water model potentials were considered, namely TIP4P and the polarizable Dang-Chang potential. The two models produce some consistent results but also exhibit significant differences. The cluster internal energy and dipole moment indicate two varieties of topological transition in the structure of the global minimum as the field strength is increased. The first takes place at low field strengths (0.1 V/Å<E < 0.2 V/Å) and reorganizes the hydrogen-bonds to orient the water permanent dipoles along the field. The second type of transition occurs at larger field strengths (0.3 V/Å<E < 0.5 V/Å) and corresponds to an extensive structural reorganization, where several hydrogen-bonds break as the cluster stretches along the field direction, the larger clusters (N > 10) usually forming helical structures.
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Affiliation(s)
- S Acosta-Gutiérrez
- Departamento de Física Fundamental II and IUdEA, Universidad de La Laguna, 38205 Tenerife, Spain
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Abstract
AbstractThe formation of aqueous bridges containing phenol and ethylene glycol as well as bisphenol-A, hydrochinone and p-cresol under the application of high voltage DC (“liquid bridges”) is reported. Detailed studies were made for phenol and glycol with concentrations from 0.005 to 0.531 mol L−1. Conductivity as well as substance and mass transfers through these aqueous bridges are discussed and compared with pure water bridges. Previously suggested bidirectional mass transport is confirmed for the substances tested. Anodic oxidation happens more efficiently when phenol or glycol are transported from the cathode to the anode since in this case the formation of a passivation layer or electrode poisoning are retarded by the electrohydrodynamic (EHD) flow. The conductivity in the cathode beaker decreases in all experiments due to electrophoretic transport of naturally dissolved carbonate and bicarbonate to the anode. The observed electrochemical behavior is shortly discussed and compared to known mechanisms.
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Protonation of Water Clusters Induced by Hydroperoxyl Radical Surface Adsorption. Chemistry 2011; 17:5076-85. [DOI: 10.1002/chem.201002706] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2010] [Indexed: 11/07/2022]
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Torrent-Sucarrat M, Anglada JM. Anharmonicity and the Eigen-Zundel Dilemma in the IR Spectrum of the Protonated 21 Water Cluster. J Chem Theory Comput 2010; 7:467-72. [DOI: 10.1021/ct100692x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Miquel Torrent-Sucarrat
- Departament de Química Biològica i Modelització Molecular, Institut de Química Avançada de Catalunya (IQAC−CSIC), c/Jordi Girona 18, E-08034 Barcelona, Spain
| | - Josep M. Anglada
- Departament de Química Biològica i Modelització Molecular, Institut de Química Avançada de Catalunya (IQAC−CSIC), c/Jordi Girona 18, E-08034 Barcelona, Spain
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Hernández-Rojas J, Calvo F, Rabilloud F, Bretón J, Gomez Llorente JM. Modeling Water Clusters on Cationic Carbonaceous Seeds. J Phys Chem A 2010; 114:7267-74. [DOI: 10.1021/jp101584n] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- J. Hernández-Rojas
- Departamento de Física Fundamental II and IUdEA, Universidad de La Laguna, 38205, La Laguna, Tenerife, Spain, and LASIM, Université de Lyon and CNRS UMR 5579, Bât. A. Kastler, 43 Bd du 11 Novembre 1918, F69622 Villeurbanne Cedex, France
| | - F. Calvo
- Departamento de Física Fundamental II and IUdEA, Universidad de La Laguna, 38205, La Laguna, Tenerife, Spain, and LASIM, Université de Lyon and CNRS UMR 5579, Bât. A. Kastler, 43 Bd du 11 Novembre 1918, F69622 Villeurbanne Cedex, France
| | - F. Rabilloud
- Departamento de Física Fundamental II and IUdEA, Universidad de La Laguna, 38205, La Laguna, Tenerife, Spain, and LASIM, Université de Lyon and CNRS UMR 5579, Bât. A. Kastler, 43 Bd du 11 Novembre 1918, F69622 Villeurbanne Cedex, France
| | - J. Bretón
- Departamento de Física Fundamental II and IUdEA, Universidad de La Laguna, 38205, La Laguna, Tenerife, Spain, and LASIM, Université de Lyon and CNRS UMR 5579, Bât. A. Kastler, 43 Bd du 11 Novembre 1918, F69622 Villeurbanne Cedex, France
| | - J. M. Gomez Llorente
- Departamento de Física Fundamental II and IUdEA, Universidad de La Laguna, 38205, La Laguna, Tenerife, Spain, and LASIM, Université de Lyon and CNRS UMR 5579, Bât. A. Kastler, 43 Bd du 11 Novembre 1918, F69622 Villeurbanne Cedex, France
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Zimmermann T, Burda JV. Charge-scaled cavities in polarizable continuum model: Determination of acid dissociation constants for platinum-amino acid complexes. J Chem Phys 2009; 131:135101. [PMID: 19814573 DOI: 10.1063/1.3236842] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Affiliation(s)
- Tomás Zimmermann
- Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague 2, Czech Republic
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Kozmutza C, Picó Y. To address accuracy and precision using methods from analytical chemistry and computational physics. ENVIRONMENTAL MONITORING AND ASSESSMENT 2009; 151:59-75. [PMID: 18369729 DOI: 10.1007/s10661-008-0249-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2007] [Accepted: 02/29/2008] [Indexed: 05/26/2023]
Abstract
In this work the pesticides were determined by liquid chromatography-mass spectrometry (LC-MS). In present study the occurrence of imidacloprid in 343 samples of oranges, tangerines, date plum, and watermelons from Valencian Community (Spain) has been investigated. The nine additional pesticides were chosen as they have been recommended for orchard treatment together with imidacloprid. The Mulliken population analysis has been applied to present the charge distribution in imidacloprid. Partitioned energy terms and the virial ratios have been calculated for certain molecules entering in interaction. A new technique based on the comparison of the decomposed total energy terms at various configurations is demonstrated in this work. The interaction ability could be established correctly in the studied case. An attempt is also made in this work to address accuracy and precision. These quantities are well-known in experimental measurements. In case precise theoretical description is achieved for the contributing monomers and also for the interacting complex structure some properties of this latter system can be predicted to quite a good accuracy. Based on simple hypothetical considerations we estimate the impact of applying computations on reducing the amount of analytical work.
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Affiliation(s)
- Cornelia Kozmutza
- Department of Theoretical Physics, Budapest University of Technology and Economics, BME, Budafoki ut 8, 1111, Budapest, Hungary.
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Chval Z, Sip M, Burda JV. The trans effect in square-planar platinum(II) complexes-A density functional study. J Comput Chem 2008; 29:2370-81. [DOI: 10.1002/jcc.20980] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Takahashi H, Ohno H, Yamauchi T, Kishi R, Furukawa SI, Nakano M, Matubayasi N. Investigation of the dominant hydration structures among the ionic species in aqueous solution: Novel quantum mechanics/molecular mechanics simulations combined with the theory of energy representation. J Chem Phys 2008; 128:064507. [DOI: 10.1063/1.2825600] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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Pavelka M, Shukla MK, Leszczynski J, Burda JV. Theoretical Study of Hydrated Copper(II) Interactions with Guanine: A Computational Density Functional Theory Study. J Phys Chem A 2008; 112:256-67. [DOI: 10.1021/jp074891+] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Nakayama T, Fukuda H, Kamikawa T, Sakamoto Y, Sugita A, Kawasaki M, Amano T, Sato H, Sakaki S, Morino I, Inoue G. Effective interaction energy of water dimer at room temperature: An experimental and theoretical study. J Chem Phys 2007; 127:134302. [DOI: 10.1063/1.2773726] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Baburao B, Visco DP, Albu TV. Association patterns in (HF)(m)(H2O)(n) (m + n = 2-8) clusters. J Phys Chem A 2007; 111:7940-56. [PMID: 17636970 DOI: 10.1021/jp0727648] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
In an attempt to understand the phase behavior of aqueous hydrogen fluoride, the clustering in the mixture is investigated at the molecular level. The study is performed at the mPW1B95/6-31+G(d,p) level of theory. Several previous studies attempted to describe the dissociation of HF in water, but in this investigation, the focus is only on the association patterns that are present in this binary mixture. A total of 214 optimized geometries of (HF)n(H2O)m clusters, with m + n as high as 8, were investigated. For each cluster combination, several different conformations are investigated, and the preferred conformations are presented. Using multiple linear regressions, the average strengths of the four possible H-bonding interactions are obtained. The strongest H-bond interaction is reported to be the H2O...H-F interaction. The most probable distributions of mixed clusters as a function of composition are also deduced. It is found that the larger (HF)n(H2O)m clusters are favored both energetically and entropically compared to the ones that are of size m + n < or = 3. Also, the clusters with equimolar contributions of HF and H2O are found to have the strongest interactions.
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Affiliation(s)
- Barath Baburao
- Department of Chemical Engineering, Tennessee Technological University, Box 5013, Cookeville, Tennessee 38505, USA
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