1
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Kaya S, Işın DÖ, Karakuş N. Kaya's composite descriptor and Maximum Composite Hardness Rule for chemical reactions. J INDIAN CHEM SOC 2022. [DOI: 10.1016/j.jics.2022.100364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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2
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3
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Chakraborty D, Chattaraj PK. Bonding, Reactivity, and Dynamics in Confined Systems. J Phys Chem A 2019; 123:4513-4531. [DOI: 10.1021/acs.jpca.9b00830] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Debdutta Chakraborty
- Department of Chemistry and Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Pratim Kumar Chattaraj
- Department of Chemistry and Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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4
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Ab initio investigation of the lower-energy candidate structures for (H2O)10+ water cluster. Struct Chem 2018. [DOI: 10.1007/s11224-018-1109-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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5
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Mandal D, Maity R, Beg H, Salgado-Morán G, Misra A. Computation of global reactivity descriptors and first hyper polarisability as a function of torsional angle of donor–acceptor substituted biphenyl ring system. Mol Phys 2017. [DOI: 10.1080/00268976.2017.1406620] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Debkumar Mandal
- Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore, India
| | - Rakesh Maity
- Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore, India
| | - Hasibul Beg
- Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore, India
| | - Guillermo Salgado-Morán
- Departamento de Ciencias Qumícas, Facultad de Ciencias Exactas, Universidad Andrés Bello, Concepción, Chile
| | - Ajay Misra
- Department of Chemistry and Chemical Technology, Vidyasagar University, Midnapore, India
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6
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Tang M, Chen X, Sun Z, Xie Y, Schaefer HF. The Hydrogen Abstraction Reaction H2S + OH → H2O + SH: Convergent Quantum Mechanical Predictions. J Phys Chem A 2017; 121:9136-9145. [DOI: 10.1021/acs.jpca.7b09563] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mei Tang
- Institute
of Atomic and Molecular Physics, Sichuan University, Chengdu, 610064, China
| | - Xiangrong Chen
- Institute
of Atomic and Molecular Physics, Sichuan University, Chengdu, 610064, China
| | - Zhi Sun
- Center
for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Yaoming Xie
- Center
for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Henry F. Schaefer
- Center
for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
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7
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Ab initio study of cationic water cluster (H 2 O) 9 + via particle swarm optimization algorithm. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2017.09.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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8
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Bhattacharyya PK. Exploring Cation−π Interaction in the Complexes with B≡B Triple Bond: A DFT Study. J Phys Chem A 2017; 121:3287-3298. [DOI: 10.1021/acs.jpca.7b01326] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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9
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Ab initio investigation of possible candidate structures and properties of water cluster (H2O)7+ via particle swarm optimization method. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2016.11.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Tang M, Hu CE, Lv ZL, Chen XR, Cai LC. Ab Initio Study of Ionized Water Radical Cation (H 2O) 8+ in Combination with the Particle Swarm Optimization Method. J Phys Chem A 2016; 120:9489-9499. [PMID: 27934325 DOI: 10.1021/acs.jpca.6b09866] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The structures of cationic water clusters (H2O)8+ have been globally explored by the particle swarm optimization method in combination with quantum chemical calculations. Geometry optimization and vibrational analysis for the 15 most interesting clusters were computed at the MP2/aug-cc-pVDZ level and infrared spectrum calculation at MPW1K/6-311++G** level. Special attention was paid to the relationships between their configurations and energies. Both MP2 and B3LYP-D3 calculations revealed that the cage-like structure is the most stable, which is different from a five-membered ring lowest energy structure but agrees well with a cage-like structure in the literature. Furthermore, our obtained cage-like structure is more stable by 0.87 and 1.23 kcal/mol than the previously reported structures at MP2 and B3LYP-D3 levels, respectively. Interestingly, on the basis of their relative Gibbs free energies and the temperature dependence of populations, the cage-like structure predominates only at very low temperatures, and the most dominating species transforms into a newfound four-membered ring structure from 100 to 400 K, which can contribute greatly to the experimental infrared spectrum. By topological analysis and reduced density gradient analysis, we also investigated the structural characteristics and bonding strengths of these water cluster radical cations.
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Affiliation(s)
- Mei Tang
- Institute of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University , Chengdu 610065, China
| | - Cui-E Hu
- College of Physics and Electronic Engineering, Chongqing Normal University , Chongqing 400047, China
| | - Zhen-Long Lv
- Institute of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University , Chengdu 610065, China
| | - Xiang-Rong Chen
- Institute of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University , Chengdu 610065, China
| | - Ling-Cang Cai
- National Key Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, Chinese Academy of Engineering Physics , Mianyang 621900, China
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11
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Liu L, Hu CE, Tang M, Chen XR, Cai LC. Ab initio investigation of structure, stability, thermal behavior, bonding, and infrared spectra of ionized water cluster (H 2O) 6. J Chem Phys 2016; 145:154307. [PMID: 27782468 DOI: 10.1063/1.4964860] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The low-lying isomers of cationic water cluster (H2O)6+ have been globally explored by using particle swarm optimization algorithm in conjunction with quantum chemical calculations. Compared with previous results, our searching method covers a wide range of structural isomers of (H2O)6+ and therefore turns out to be more effective. With these local minima, geometry optimization and vibrational analysis are performed for the most interesting clusters at second-order Møller-Plesset (MP2)/aug-cc-pVDZ level, and their energies are further refined at MP2/aug-cc-pVTZ and coupled-cluster theory with single, double, and perturbative triple excitations/aug-cc-pVDZ level. The interaction energies using the complete basis set limits at MP2 level are also reported. The relationships between their structure arrangement and their energies are discussed. Based on the results of thermal simulation, structural change from a four-numbered ring to a tree-like structure occurs at T ≈ 45 K, and the relative population of six lowest-free-energy isomers is found to exceed 4% at some point within the studied temperature range. Studies reveal that, among these six isomers, two new-found isomers constitute 10% of isomer population at 180 K, and the experimental spectra can be better explained with inclusions of the two isomers. The molecular orbitals for six representative cationic water clusters are also studied. Through topological and reduced density gradient analysis, we investigated the structural characteristics and the bonding strengths of these water cluster radical cations.
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Affiliation(s)
- Lei Liu
- Institute of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University, Chengdu 610064, China
| | - Cui-E Hu
- College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 400047, China
| | - Mei Tang
- Institute of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University, Chengdu 610064, China
| | - Xiang-Rong Chen
- Institute of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University, Chengdu 610064, China
| | - Ling-Cang Cai
- National Key Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, CAEP, Mianyang 621900, China
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12
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Substituent effects on the properties of the hemi-bonded complexes (XH2P···NH2Y)+ (X, Y=H, F, Cl, Br, NH2, CH3, OH). J Mol Model 2015; 22:1. [DOI: 10.1007/s00894-015-2876-x] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Accepted: 11/22/2015] [Indexed: 11/26/2022]
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13
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Atabaki H, Nori-Shargh D, Momen-Heravi M, Niazi A. Electrostatic and stereoelectronic interaction impacts on the structural properties and isomerization reactions of methyl isocyanide and its trihalo-analogs. Struct Chem 2015. [DOI: 10.1007/s11224-015-0653-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Jalali E, Nori-Shargh D. Symmetry breaking in the axial symmetrical configurations of enolic propanedial, propanedithial, and propanediselenal: pseudo Jahn–Teller effect versus the resonance-assisted hydrogen bond theory. CAN J CHEM 2015. [DOI: 10.1139/cjc-2015-0071] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The origin of the symmetry breaking in the axial symmetrical configurations of enolic propanedial (1), propanedithial (2), and propanediselenal (3) have been investigated by means of time-dependence density functional theory and natural bond orbital interpretations. The results obtained at the quantum chemistry composite (G2MP2, CBS-QB3), ab initio molecular orbital (MP2/6-311++G**), and hybrid density functional theory (B3LYP/6-311++G**) levels of theory showed that the hydrogen-centered synchronous axial symmetrical (C2v) configurations of compounds 1–3 possessing the maximum π-electron delocalization within the M1=C2–C3=C4–M5–H6 keto-enol groups are less stable than their corresponding plane symmetrical (Cs) forms. Importantly, the symmetry breaking in the C2v configurations of the enol forms of compounds 1–3 to their corresponding plane symmetrical Cs configurations is due to the pseudo Jahn–Teller effect (PJTE) by mixing the ground A1 and excited B2 electronic states resulting in a PJT (A1 + B2) ⊗ b2 problem. We may expect that by the decrease of the energy gaps between reference states in the C2v forms that are involved in the PJTE decrease from compound 1 to compound 3, the PJT stabilization energy (PJTSE) may increase but the results obtained showed that the corresponding PJTSEs decrease. This fact can be justified by the increase of the electron delocalizations from the nonbonding orbitals of the C=M moieties to the antibonding orbitals of the H–M bonds, which leads to an increase of the π-electron delocalization within the M1=C2–C3=C4–M5–H6 keto-enol groups. In confrontation between the impacts of the resonance-assisted hydrogen bond and PJTE in the structural and configurational properties of compounds 1–3, PJTE has an overwhelming contribution and causes the symmetry breaking of the C2v configurations to their corresponding Cs forms. The correlations between the structural parameters, synchronicity indices, natural charges, PJTSEs, electron delocalizations, and the hardness of compounds 1–3 have been investigated.
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Affiliation(s)
- Elahe Jalali
- Department of Chemistry, Arak Branch, Islamic Azad University, Arak, Iran
- Department of Chemistry, Arak Branch, Islamic Azad University, Arak, Iran
| | - Davood Nori-Shargh
- Department of Chemistry, Arak Branch, Islamic Azad University, Arak, Iran
- Department of Chemistry, Arak Branch, Islamic Azad University, Arak, Iran
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15
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Lv ZL, Cheng Y, Chen XR, Cai LC. Structural exploration and properties of (H2O)4+ cluster via ab initio in combination with particle swarm optimization method. Chem Phys 2015. [DOI: 10.1016/j.chemphys.2015.02.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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16
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Structures and stabilities of hemi-bonded vs proton-transferred isomers of dimer radical cation systems (XH 3 YH 3 ) + (X,Y = N, P, As). Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2014.11.033] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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17
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Hasanzadeh N, Nori-Shargh D. Correlations between hardness, electronegativity, anomeric effect associated with electron delocalizations and electrostatic interactions in 1,4,5,8-tetraoxadecalin and its analogs containing S and Se atoms. COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2014.10.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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18
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Szarek P, Grochala W. Most Probable Distance between the Nucleus and HOMO Electron: The Latent Meaning of Atomic Radius from the Product of Chemical Hardness and Polarizability. J Phys Chem A 2014; 118:10281-7. [DOI: 10.1021/jp507423p] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paweł Szarek
- Center
for New Technologies, University of Warsaw, Żwirki i Wigury 93, 02089 Warsaw, Poland
| | - Wojciech Grochala
- Center
for New Technologies, University of Warsaw, Żwirki i Wigury 93, 02089 Warsaw, Poland
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19
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Correlations between hardness, electrostatic interactions, and thermodynamic parameters in the decomposition reactions of 3-buten-1-ol, 3-methoxy-1-propene, and ethoxyethene. Struct Chem 2014. [DOI: 10.1007/s11224-014-0514-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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20
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Lv ZL, Xu K, Cheng Y, Chen XR, Cai LC. Ab initioinvestigation of the lower energy candidate structures for (H2O)5+water cluster. J Chem Phys 2014; 141:054309. [DOI: 10.1063/1.4891721] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Zhen-Long Lv
- Institute of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University, Chengdu 610064, China
- School of Physics and Engineering, Henan University of Science and Technology, Luoyang 471023, China
| | - Kai Xu
- Institute of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University, Chengdu 610064, China
| | - Yan Cheng
- Institute of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University, Chengdu 610064, China
| | - Xiang-Rong Chen
- Institute of Atomic and Molecular Physics, College of Physical Science and Technology, Sichuan University, Chengdu 610064, China
| | - Ling-Cang Cai
- National Key Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, Chinese Academy of Engineering Physics, Mianyang 621900, China
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21
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Malomuzh NP, Makhlaichuk VN, Khrapatyi SV. Water dimer dipole moment. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2014. [DOI: 10.1134/s0036024414080172] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Structures and stabilities of asymmetrical dimer radical cation systems (AH3–H2O)+ (A=N, P, As). Struct Chem 2014. [DOI: 10.1007/s11224-014-0472-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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23
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Pan S, Solà M, Chattaraj PK. On the Validity of the Maximum Hardness Principle and the Minimum Electrophilicity Principle during Chemical Reactions. J Phys Chem A 2013; 117:1843-52. [DOI: 10.1021/jp312750n] [Citation(s) in RCA: 134] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sudip Pan
- Department of Chemistry and Center for Theoretical
Studies, Indian Institute of Technology, Kharagpur 721302, India
| | - Miquel Solà
- Institut de Química Computacional and Department de Química, Universitat de Girona, Campus Montilivi, 17071 Girona,
Catalonia, Spain
| | - Pratim K. Chattaraj
- Department of Chemistry and Center for Theoretical
Studies, Indian Institute of Technology, Kharagpur 721302, India
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24
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Joshi R, Ghanty TK, Mukherjee T, Naumov S. Hydrogen Bonding in Neutral and Cation Dimers of H2Se with H2O, H2S, and H2Se. J Phys Chem A 2012; 116:11965-72. [DOI: 10.1021/jp308735j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | - Sergej Naumov
- Department
of Interface Physics, University of Leipzig, Linnestrasse 5, D-04103 Leipzig,
Germany
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25
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von Szentpály L. Reply to “Comment on 'Ruling Out Any Electrophilicity Equalization Principle'”. J Phys Chem A 2011. [DOI: 10.1021/jp210486g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- László von Szentpály
- Institut für Theoretische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D 70569 Stuttgart, Germany
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26
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Biswas A, Saha R, Ghosh A. Two unusual mixed-valent trinuclear CuII2CuI complexes containing copper(i) tribromide dianion as bridging ligand: Identification of an unprecedented doubly hydrogen-bonded water dimer. CrystEngComm 2011. [DOI: 10.1039/c0ce00784f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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27
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Zhang L, Li X, Zhou Y, Wang X. Unprecedented formation of a hydrogen-bonded assembly of water–diethylenetriamine molecules within a new solid state supramolecular molybdenum(V) phosphate complex. J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2009.03.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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28
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Torrent-Sucarrat M, Geerlings P, Luis JM. Imaginary Vibrational Modes in Polycyclic Aromatic Hydrocarbons: A Challenging Test for the Hardness Profiles. Chemphyschem 2007; 8:1065-70. [PMID: 17315253 DOI: 10.1002/cphc.200700011] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
In a very recent article (J. Am. Chem. Soc. 2006, 128, 9342-9343) Moran et al. found that electron-correlated methodologies using popular Pople basis sets lead to spurious nonplanar polycyclic aromatic hydrocarbon (PAH) equilibrium structures. Furthermore, some of the present authors have shown that the hardness profiles along a reaction path can be a useful tool to find spurious stationary points in the potential energy surface. Herein, we test the performance of the hardness profiles to detect shortcomings in energy profiles for the challenging case of nonplanar PAHs. The results obtained show that in 41 of the 42 imaginary vibrational modes studied, the hardness profiles indicate the wrong number and type of the potential energy surface stationary points.
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Affiliation(s)
- Miquel Torrent-Sucarrat
- Eenheid Algemene Chemie, Faculteit Wetenschappen, Vrije Universiteit Brussel (VUB), Pleinlaan 2, Brussels, Belgium.
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30
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Joshi R, Ghanty TK, Naumov S, Mukherjee T. Structural Investigation of Asymmetrical Dimer Radical Cation System (H2O−H2S)+: Proton-Transferred or Hemi-Bonded? J Phys Chem A 2007; 111:2362-7. [PMID: 17388317 DOI: 10.1021/jp067757i] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ab initio molecular orbital and hybrid density functional methods have been employed to characterize the structure and bonding of (H2O-H2S)+, an asymmetrical dimer radical cation system. A comparison has been made between the two-center three-electron (2c-3e) hemi-bonded system and the proton-transferred hydrogen-bonded systems of (H2O-H2S)+. Geometry optimization of these systems was carried out using unrestricted Hartree Fock (HF), density functional theory with different functionals, and second-order Møller-Plesset perturbation (MP2) methods with 6-311++G(d,p) basis set. Hessian calculations have been done at the same level to check the nature of the equilibrium geometry. Energy data were further improved by calculating basis set superposition error for the structures optimized through MP2/6-311++G(d,p) calculations. The calculated results show that the dimer radical cation structure with H2O as proton acceptor is more stable than those structures in which H2O acts as a proton donor or the 2c-3e hemi-bonded (H2O thereforeSH2)+ system. This stability trend has been further confirmed by more accurate G3, G3B3, and CCSD(T) methods. On the basis of the present calculated results, the structure of H4OS+ can best be described as a hydrogen-bonded complex of H3O+ and SH with H2O as a proton acceptor. It is in contrast to the structure of neutral (H2O...H2S) dimer where H2O acts as a proton donor. The present work has been able to resolve the ambiguity in the nature of bonding between H2O and H2S in (H2O-H2S)+ asymmetrical dimer radical cation.
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Affiliation(s)
- Ravi Joshi
- Radiation and Photochemistry Division, and Theoretical Chemistry Section, and Chemistry Group, Bhabha Atomic Research Center, Mumbai 400 085, India
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31
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32
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Torrent-Sucarrat M, De Proft F, Geerlings P. Stiffness and Raman Intensity: a Conceptual and Computational DFT Study. J Phys Chem A 2005; 109:6071-6. [PMID: 16833943 DOI: 10.1021/jp044150y] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A DFT-based reactivity descriptor, the nuclear stiffness, is related to the Raman scattering intensity, which is experimentally accessible. The application of this new relationship obtained within certain approximations has been checked in two different sets of molecules. First, we study a favorable case, where the contribution of the anisotropy to the Raman intensity is zero (symmetric stretching mode in 15 tetrahedral molecules). Second, we consider a "worst" case scenario, where the anisotropy contribution can be expected to be important (stretching mode in 32 diatomic molecules). The numerical results clearly show a relationship between stiffness and Raman intensity reflecting the expected anisotropy influence.
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Affiliation(s)
- Miquel Torrent-Sucarrat
- Eenheid Algemene Chemie, Faculteit Wetenschappen, Vrije Universiteit Brussel (VUB), Pleinlaan 2, Brussels, Belgium
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33
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Torrent-Sucarrat M, Luis JM, Duran M, Sola M. The hardness profile as a tool to detect spurious stationary points in the potential energy surface. J Chem Phys 2004; 120:10914-24. [PMID: 15268121 DOI: 10.1063/1.1742793] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In the present work, we have computed the energy and hardness profiles for a series of inter and intramolecular conformational changes at several levels of calculation. All processes studied have in common the fact that the choice of a weak methodology or a poor basis set results in the presence of spurious stationary points in the energy profile. At variance with the energy profiles, the hardness profiles calculated as the difference between the vertical ionization potential and electron affinity always show the correct number of stationary points independently of the basis set and methodology used. For this reason, we have concluded that hardness profiles can be used to check the reliability of the energy profiles for those chemical systems that, because of their size, cannot be treated with high level ab initio methods.
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Affiliation(s)
- Miquel Torrent-Sucarrat
- Institut de Química Computacional and Departament de Química, Universitat de Girona, E-17071 Girona, Catalonia, Spain
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34
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Parthasarathi R, Padmanabhan J, Subramanian V, Maiti B, Chattaraj PK. Chemical Reactivity Profiles of Two Selected Polychlorinated Biphenyls. J Phys Chem A 2003. [DOI: 10.1021/jp035620b] [Citation(s) in RCA: 140] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- R. Parthasarathi
- Chemical Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020, Department of Physics, L.N. Government College, Ponneri 601 204, and Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
| | - J. Padmanabhan
- Chemical Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020, Department of Physics, L.N. Government College, Ponneri 601 204, and Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
| | - V. Subramanian
- Chemical Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020, Department of Physics, L.N. Government College, Ponneri 601 204, and Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
| | - B. Maiti
- Chemical Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020, Department of Physics, L.N. Government College, Ponneri 601 204, and Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
| | - P. K. Chattaraj
- Chemical Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020, Department of Physics, L.N. Government College, Ponneri 601 204, and Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
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Affiliation(s)
- P. K. Chattaraj
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
| | - U. Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
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Ghanty TK, Ghosh SK. Ab Initio CASSCF and DFT Investigations of (H2O)2+ and (H2S)2+: Hemi-Bonded vs Proton-Transferred Structure. J Phys Chem A 2002. [DOI: 10.1021/jp0264275] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tapan K. Ghanty
- Theoretical Chemistry Section, RC & CD Division, Chemistry Group, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Swapan K. Ghosh
- Theoretical Chemistry Section, RC & CD Division, Chemistry Group, Bhabha Atomic Research Centre, Mumbai 400 085, India
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