551
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552
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Liu H, Man R, Wang Z, Liao J, Li X, Ma S, Yi P. Study on the cooperativity of hydrogen bonds between H2Y and HX (X = F, Cl, Br; Y = O, S, Se). JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2014. [DOI: 10.1142/s0219633614500370] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The structure characteristics, interaction energies, cooperative energies of the complexes between chalcogen hydrides ( H 2 Y ) and halogen hydrides (HX) have been studied theoretically at the MP2 level with aug-cc-pVTZ basis set in this paper. The conclusions show that there are strong interactions between H 2 Y and HX. The stability of the complex is decided by the electronegativity of the negatively charged atom. The cooperativity is observed in the two or three hydrogen bonds of each trimer structures in title system. The values of the cooperative energies and the cooperative contributions all illustrate that the cooperativity is of great importance in these complexes. The "atoms in molecules" (AIM) analyses show that the complexes in title system are mainly electrostatic interactions (closed-shell interactions) in character. For H ⋯ O bonds in H 2 O ⋯ HF ⋯ H 2 O , H 2 O ⋯ HBr ⋯ H 2 O and HF ⋯ H 2 O ⋯ HF , the 1 < |Vc|/Gc < 2 and -Gc < Hc < 0 indicate the interactions in these compounds are between closed-shell interaction and opened-shell interaction.
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Affiliation(s)
- Hexiu Liu
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
- School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Ruilin Man
- School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China
| | - Zhaoxu Wang
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
| | - Jianping Liao
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
| | - Xiaofang Li
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
| | - Songjiang Ma
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
| | - Pinggui Yi
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, P. R. China
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553
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Samanta AK, Czakó G, Wang Y, Mancini JS, Bowman JM, Reisler H. Experimental and theoretical investigations of energy transfer and hydrogen-bond breaking in small water and HCl clusters. Acc Chem Res 2014; 47:2700-9. [PMID: 25072730 DOI: 10.1021/ar500213q] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Water is one of the most pervasive molecules on earth and other planetary bodies; it is the molecule that is searched for as the presumptive precursor to extraterrestrial life. It is also the paradigm substance illustrating ubiquitous hydrogen bonding (H-bonding) in the gas phase, liquids, crystals, and amorphous solids. Moreover, H-bonding with other molecules and between different molecules is of the utmost importance in chemistry and biology. It is no wonder, then, that for nearly a century theoreticians and experimentalists have tried to understand all aspects of H-bonding and its influence on reactivity. It is somewhat surprising, therefore, that several fundamental aspects of H-bonding that are particularly important for benchmarking theoretical models have remained unexplored experimentally. For example, even the binding strength between two gas-phase water molecules has never been determined with sufficient accuracy for comparison with high-level electronic structure calculations. Likewise, the effect of cooperativity (nonadditivity) in small H-bonded networks is not known with sufficient accuracy. An even greater challenge for both theory and experiment is the description of the dissociation dynamics of H-bonded small clusters upon acquiring vibrational excitation. This is because of the long lifetimes of many clusters, which requires running classical trajectories for many nanoseconds to achieve dissociation. In this Account, we describe recent progress and ongoing research that demonstrates how the combined and complementary efforts of theory and experiment are enlisted to determine bond dissociation energies (D0) of small dimers and cyclic trimers of water and HCl with unprecedented accuracy, describe dissociation dynamics, and assess the effects of cooperativity. The experimental techniques rely on IR excitation of H-bonded X-H stretch vibrations, measuring velocity distributions of fragments in specific rovibrational states, and determining product state distributions at the pair-correlation level. The theoretical methods are based on high-level ab initio potential energy surfaces used in quantum and classical dynamical calculations. We achieve excellent agreement on D0 between theory and experiments for all of the clusters that we have compared, as well as for cooperativity in ring trimers of water and HCl. We also show that both the long-range and the repulsive parts of the potential must be involved in bond breaking. We explain why H-bonds are so resilient and hard to break, and we propose that a common motif in the breaking of cyclic trimers is the opening of the ring following transfer of one quantum of stretch excitation to form open-chain structures that are weakly bound. However, it still takes many vibrational periods to release one monomer fragment from the open-chain structures. Our success with water and HCl dimers and trimers led us to embark on a more ambitious project: studies of mixed water and HCl small clusters. These clusters eventually lead to ionization of HCl and serve as prototypes of acid dissociation in water. Measurements and calculations of such ionizations are yet to be achieved, and we are now characterizing these systems by adding monomers one at a time. We describe our completed work on the HCl-H2O dimer and mention our recent theoretical results on larger mixed clusters.
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Affiliation(s)
- Amit K. Samanta
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Gábor Czakó
- Laboratory
of Molecular Structure and Dynamics, Institute of Chemistry, Eötvös University, P.O. Box 32, H-1518 Budapest 112, Hungary
| | - Yimin Wang
- Department
of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States
| | - John S. Mancini
- Department
of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States
| | - Joel M. Bowman
- Department
of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States
| | - Hanna Reisler
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
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554
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Ronca E, Belpassi L, Tarantelli F. A quantitative view of charge transfer in the hydrogen bond: the water dimer case. Chemphyschem 2014; 15:2682-7. [PMID: 25044753 DOI: 10.1002/cphc.201402321] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Indexed: 11/08/2022]
Abstract
The hydrogen bond represents a fundamental intermolecular interaction that binds molecules in vapor and liquid water. A crucial and debated aspect of its electronic structure and chemistry is the charge transfer (CT) accompanying it. Much effort has been devoted, in particular, to the study of the smallest prototype system, the water dimer, but even here results and interpretations differ widely. In this paper, we reassess CT in the water dimer by using charge-displacement analysis. Besides a reliable estimate of the amount of CT (14.6 me) that characterizes the system, our study provides an unambiguous context, and very useful bounds, within which CT effects may be evaluated, crucially including the associated energy stabilization.
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Affiliation(s)
- Enrico Ronca
- Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia via Elce di Sotto 8, I-06123 Perugia (Italy); Istituto di Scienze e Tecnologie Molecolari del CNR via Elce di Sotto 8, I-06123 Perugia (Italy).
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555
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Martínez-Cifuentes M, Weiss-López BE, Santos LS, Araya-Maturana R. Intramolecular hydrogen bond in biologically active o-carbonyl hydroquinones. Molecules 2014; 19:9354-68. [PMID: 24995921 PMCID: PMC6270916 DOI: 10.3390/molecules19079354] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 06/18/2014] [Accepted: 06/27/2014] [Indexed: 11/16/2022] Open
Abstract
Intramolecular hydrogen bonds (IHBs) play a central role in the molecular structure, chemical reactivity and interactions of biologically active molecules. Here, we study the IHBs of seven related o-carbonyl hydroquinones and one structurally-related aromatic lactone, some of which have shown anticancer and antioxidant activity. Experimental NMR data were correlated with theoretical calculations at the DFT and ab initio levels. Natural bond orbital (NBO) and molecular electrostatic potential (MEP) calculations were used to study the electronic characteristics of these IHB. As expected, our results show that NBO calculations are better than MEP to describe the strength of the IHBs. NBO energies (∆Eij(2)) show that the main contributions to energy stabilization correspond to LP-->σ* interactions for IHBs, O1…O2-H2 and the delocalization LP-->π* for O2-C2=Cα(β). For the O1…O2-H2 interaction, the values of ∆Eij(2) can be attributed to the difference in the overlap ability between orbitals i and j (Fij), instead of the energy difference between them. The large energy for the LP O2-->π* C2=Cα(β) interaction in the compounds 9-Hydroxy-5-oxo-4,8, 8-trimethyl-l,9(8H)-anthracenecarbolactone (VIII) and 9,10-dihydroxy-4,4-dimethylanthracen-1(4H)-one (VII) (55.49 and 60.70 kcal/mol, respectively) when compared with the remaining molecules (all less than 50 kcal/mol), suggests that the IHBs in VIII and VII are strongly resonance assisted.
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Affiliation(s)
- Maximiliano Martínez-Cifuentes
- Laboratorio de Síntesis Asimétrica, Instituto de Química de los Recursos Naturales, Universidad de Talca, Talca, Casilla 747, Chile.
| | - Boris E Weiss-López
- Departamento de Química, Facultad de Ciencias, Universidad de Chile, Santiago, Casilla 653, Chile.
| | - Leonardo S Santos
- Laboratorio de Síntesis Asimétrica, Instituto de Química de los Recursos Naturales, Universidad de Talca, Talca, Casilla 747, Chile.
| | - Ramiro Araya-Maturana
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas Y Farmacéuticas, Universidad de Chile, Santiago, Casilla 233, Chile.
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556
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Gu Q, Trindle CO, Knee JL. Electronic and Cationic Spectroscopy of 9-Hydroxy-9-fluorene Carboxylic Acid. J Phys Chem A 2014; 118:4982-7. [DOI: 10.1021/jp5045578] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Quanli Gu
- R. J. Reynolds
Tobacco Company, Winston Salem, North Carolina 27105, United States
| | - Carl O. Trindle
- Chemistry
Department, University of Virginia, Charlottesville, Virginia 22903, United States
| | - J. L. Knee
- Chemistry
Department, Wesleyan University, Middletown, Connecticut 06459, United States
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557
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Rusinska-Roszak D, Sowinski G. Estimation of the intramolecular O-H···O═C hydrogen bond energy via the molecular tailoring approach. Part I: aliphatic structures. J Chem Inf Model 2014; 54:1963-77. [PMID: 24921685 DOI: 10.1021/ci500107w] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A simple and universal method for the estimation of the intramolecular hydrogen bond (HB) energy (E(HB)) in hydroxycarbonyl aliphatic compounds is proposed by the application of the molecular tailoring approach (MTA) based on calculations at the second-order Møller-Plesset MP2 level. The calculation of EHB can be realized by the one optimization and three single point calculations of the energy for each compound with carbonyl and hydroxyl groups involved in HB. The intramolecular hydrogen bond energies estimated for 153 structures (of 102 compounds) ranged from 1.4 to 13.7 kcal/mol for systems without resonance-assisted hydrogen bonding (RAHB). To verify the method, we show the correlations of the energy (E(HB)) in six-, seven-, and eight-membered HB rings in the optimized multifunctional molecules with the usual geometry descriptors of hydrogen bonds. Moreover, topological parameters from the atoms in molecules (AIM) theory and the calculated infrared and proton NMR spectra are correlated. The effects of conjugation and π-electron delocalization, bifurcation, and cooperativity are discussed, along with the correlation between the strength and geometrical parameters of H bonding.
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Affiliation(s)
- Danuta Rusinska-Roszak
- Institute of Chemical Technology and Engineering, Poznan University of Technology , Pl. M. Sklodowskiej-Curie 2, 60-965 Poznan, Poland
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558
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Ayoub AT, Tuszynski J, Klobukowski M. Estimating hydrogen bond energies: comparison of methods. Theor Chem Acc 2014. [DOI: 10.1007/s00214-014-1520-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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559
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Calero S, Gómez-Álvarez P. Hydrogen bonding of water confined in zeolites and their zeolitic imidazolate framework counterparts. RSC Adv 2014. [DOI: 10.1039/c4ra01508h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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560
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Ruggiu F, Solov'ev V, Marcou G, Horvath D, Graton J, Le Questel JY, Varnek A. Individual Hydrogen-Bond Strength QSPR Modelling with ISIDA Local Descriptors: a Step Towards Polyfunctional Molecules. Mol Inform 2014; 33:477-87. [PMID: 27485986 DOI: 10.1002/minf.201400032] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Accepted: 05/15/2014] [Indexed: 11/09/2022]
Abstract
Here, we introduce new ISIDA fragment descriptors able to describe "local" properties related to selected atoms or molecular fragments. These descriptors have been applied for QSPR modelling of the H-bond basicity scale pKBHX , measured by the 1 : 1 complexation constant of a series of organic acceptors (H-bond bases) with 4-fluorophenol as the reference H-bond donor in CCl4 at 298 K. Unlike previous QSPR studies of H-bond complexation, the models based on these new descriptors are able to predict the H-bond basicity of different acceptor centres on the same polyfunctional molecule. QSPR models were obtained using support vector machine and ensemble multiple linear regression methods on a set of 537 organic compounds including 5 bifunctional molecules. They were validated with cross-validation procedures and with two external test sets. The best model displays good predictive performance on a large test set of 451 mono- and bifunctional molecules: a root-mean squared error RMSE=0.26 and a determination coefficient R(2) =0.91. It is implemented on our website (http://infochim.u-strasbg.fr/webserv/VSEngine.html) together with the estimation of its applicability domain and an automatic detection of potential H-bond acceptors.
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Affiliation(s)
- Fiorella Ruggiu
- Laboratoire de Chémoinformatique, UMR 7140 CNRS, Université de Strasbourg, 1, rue Blaise Pascal, 67000 Strasbourg, France phone:+33368851560
| | - Vitaly Solov'ev
- Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninskiy prospect, 31a, 119991, Moscow, Russian Federation
| | - Gilles Marcou
- Laboratoire de Chémoinformatique, UMR 7140 CNRS, Université de Strasbourg, 1, rue Blaise Pascal, 67000 Strasbourg, France phone:+33368851560
| | - Dragos Horvath
- Laboratoire de Chémoinformatique, UMR 7140 CNRS, Université de Strasbourg, 1, rue Blaise Pascal, 67000 Strasbourg, France phone:+33368851560
| | - Jérôme Graton
- Université de Nantes, UMR CNRS 6230, Chimie Et Interdisciplinarité: Synthèse, Analyse, Modélisation (CEISAM), UFR Sciences & Techniques, 2, rue de la Houssinière, BP 92208, 44322 NANTES Cedex 3, France
| | - Jean-Yves Le Questel
- Université de Nantes, UMR CNRS 6230, Chimie Et Interdisciplinarité: Synthèse, Analyse, Modélisation (CEISAM), UFR Sciences & Techniques, 2, rue de la Houssinière, BP 92208, 44322 NANTES Cedex 3, France
| | - Alexandre Varnek
- Laboratoire de Chémoinformatique, UMR 7140 CNRS, Université de Strasbourg, 1, rue Blaise Pascal, 67000 Strasbourg, France phone:+33368851560.
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561
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Krasilnikov PM. Two-dimensional model of a double-well potential: Proton transfer upon hydrogen bond deformation. Biophysics (Nagoya-shi) 2014. [DOI: 10.1134/s0006350914020158] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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562
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Liu Y, Zhang R, Wang X, Sun P, Chen W, Shen J, Xue G. The strong interaction between poly(vinyl chloride) and a new eco-friendly plasticizer: A combined experiment and calculation study. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.04.037] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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563
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Amini SK. A systematic investigation of cooperativity between two types of hydrogen bonding in the nonlinear clusters of an aromatic molecule: Pyrazole. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2014.03.039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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564
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Sweetman AM, Jarvis SP, Sang H, Lekkas I, Rahe P, Wang Y, Wang J, Champness N, Kantorovich L, Moriarty P. Mapping the force field of a hydrogen-bonded assembly. Nat Commun 2014; 5:3931. [PMID: 24875276 PMCID: PMC4050271 DOI: 10.1038/ncomms4931] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Accepted: 04/22/2014] [Indexed: 02/03/2023] Open
Abstract
Hydrogen bonding underpins the properties of a vast array of systems spanning a wide variety of scientific fields. From the elegance of base pair interactions in DNA to the symmetry of extended supramolecular assemblies, hydrogen bonds play an essential role in directing intermolecular forces. Yet fundamental aspects of the hydrogen bond continue to be vigorously debated. Here we use dynamic force microscopy (DFM) to quantitatively map the tip-sample force field for naphthalene tetracarboxylic diimide molecules hydrogen-bonded in two-dimensional assemblies. A comparison of experimental images and force spectra with their simulated counterparts shows that intermolecular contrast arises from repulsive tip-sample interactions whose interpretation can be aided via an examination of charge density depletion across the molecular system. Interpreting DFM images of hydrogen-bonded systems therefore necessitates detailed consideration of the coupled tip-molecule system: analyses based on intermolecular charge density in the absence of the tip fail to capture the essential physical chemistry underpinning the imaging mechanism.
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Affiliation(s)
- A. M. Sweetman
- School of Physics & Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
- These authors contributed equally to this work
| | - S. P. Jarvis
- School of Physics & Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
- These authors contributed equally to this work
| | - Hongqian Sang
- School of Physics and Technology, Centre for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-structures, Wuhan University, Wuhan 430072, China
- Department of Physics, King’s College London, The Strand, London WC2R 2LS, UK
- These authors contributed equally to this work
| | - I. Lekkas
- School of Physics & Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
| | - P. Rahe
- Department of Physics and Astronomy, University of Utah, Salt Lake City, Utah 84112-0830, USA
| | - Yu Wang
- School of Physics and Technology, Centre for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-structures, Wuhan University, Wuhan 430072, China
| | - Jianbo Wang
- School of Physics and Technology, Centre for Electron Microscopy and MOE Key Laboratory of Artificial Micro- and Nano-structures, Wuhan University, Wuhan 430072, China
| | - N.R. Champness
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD, UK
| | - L. Kantorovich
- Department of Physics, King’s College London, The Strand, London WC2R 2LS, UK
| | - P. Moriarty
- School of Physics & Astronomy, University of Nottingham, Nottingham NG7 2RD, UK
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565
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566
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GUHA SATYAJIT, NEOGI SOUMYAGANGULY, CHAUDHURY PINAKI. Study of structure and spectroscopy of water–hydroxide ion clusters: A combined simulated annealing and DFT-based approach. J CHEM SCI 2014. [DOI: 10.1007/s12039-014-0613-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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567
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Riley KE, Hobza P. The relative roles of electrostatics and dispersion in the stabilization of halogen bonds. Phys Chem Chem Phys 2014; 15:17742-51. [PMID: 24067893 DOI: 10.1039/c3cp52768a] [Citation(s) in RCA: 113] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In this work we highlight recent work aimed at the characterization of halogen bonds. Here we discuss the origins of the σ-hole, the modulation of halogen bond strength by changing of neighboring chemical groups (i.e. halogen bond tuning), the performance of various computational methods in treating halogen bonds, and the strength and character of the halogen bond, the dihalogen bond, and two hydrogen bonds in bromomethanol dimers (which serve as model complexes) are compared. Symmetry adapted perturbation theory analysis of halogen bonding complexes indicates that halogen bonds strongly depend on both dispersion and electrostatics. The electrostatic interaction that occurs between the halogen σ-hole and the electronegative halogen bond donor is responsible for the high degree of directionality exhibited by halogen bonds. Because these noncovalent interactions have a strong dispersion component, it is important that the computational method used to treat a halogen bonding system be chosen very carefully, with correlated methods (such as CCSD(T)) being optimal. It is also noted here that most forcefield-based molecular mechanics methods do not describe the halogen σ-hole, and thus are not suitable for treating systems with halogen bonds. Recent attempts to improve the molecular mechanics description of halogen bonds are also discussed.
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Affiliation(s)
- Kevin E Riley
- Department of Chemistry, Xavier University of Louisiana, 1 Drexel Drive, Box 22, New Orleans, LA 70125, USA.
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568
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Ewing CS, Bhavsar S, Veser G, McCarthy JJ, Johnson JK. Accurate amorphous silica surface models from first-principles thermodynamics of surface dehydroxylation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:5133-5141. [PMID: 24793021 DOI: 10.1021/la500422p] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Accurate atomically detailed models of amorphous materials have been elusive to-date due to limitations in both experimental data and computational methods. We present an approach for constructing atomistic models of amorphous silica surfaces encountered in many industrial applications (such as catalytic support materials). We have used a combination of classical molecular modeling and density functional theory calculations to develop models having predictive capabilities. Our approach provides accurate surface models for a range of temperatures as measured by the thermodynamics of surface dehydroxylation. We find that a surprisingly small model of an amorphous silica surface can accurately represent the physics and chemistry of real surfaces as demonstrated by direct experimental validation using macroscopic measurements of the silanol number and type as a function of temperature. Beyond accurately predicting the experimentally observed trends in silanol numbers and types, the model also allows new insights into the dehydroxylation of amorphous silica surfaces. Our formalism is transferrable and provides an approach to generating accurate models of other amorphous materials.
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Affiliation(s)
- Christopher S Ewing
- Department of Chemical and Petroleum Engineering, ‡Mascaro Center for Sustainable Innovation, University of Pittsburgh , Pittsburgh, Pennsylvania 15261, United States
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569
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570
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Albrecht M, Isaak E, Moha V, Raabe G, Fröhlich R. Stereocontrol in dinuclear triple lithium-bridged titanium(IV) complexes: solving some stereochemical mysteries. Chemistry 2014; 20:6650-8. [PMID: 24782405 DOI: 10.1002/chem.201402370] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Indexed: 11/07/2022]
Abstract
Compounds 1 a-f-H2 form "monomeric" triscatecholate titanium(IV) complexes [Ti(1 a-f)3](2-), which in the presence of Li cations are in equilibrium with the triple lithium-bridged "dimers" [Li3(Ti(1 a-f)3)2](-). The equilibrium strongly depends on the donor ability of the solvent. Usually, in solvents with high donor ability, the stereochemically labile monomer is preferred, whereas in nondonor solvents, the dimer is the major species. In the latter, the stereochemistry at the complex units is "locked". The configuration at the titanium(IV) triscatecholates is influenced by addition of chiral ammonium countercations. In this case, the induced stereochemical information at the monomer is transferred to the dimer. Alternatively, the configuration at the metal complexes can be controlled by enantiomerically pure ester side chains. Due to the different orientation of the ester groups in the monomer or dimer, opposite configurations of the triscatecholates were observed by circular dichroism (CD) spectroscopy for [Ti(1 c-e)3](2-) or [Li3(Ti(1 c-e)3)2](-). A surprising exception was found for the dimer [Li3(Ti(1 f)3)2](-). Herein, the dimer is the dominating species in weak donor (methanol), as well as strong donor (DMSO), solvents. This is due to the bulkiness of the ester substituent destabilizing the monomer. Due to the size of the substituent in [Li3(Ti(1 f)3)2](-) the esters have to adopt an unusual conformation in the dimer resulting in a stereocontrol of the small methyl group. Following this, opposite stereocontrol mechanisms were observed for the central metal-complex units of [Li3(Ti(1 c-e)3)2](-) or [Li3(Ti(1 f)3)2](-).
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Affiliation(s)
- Markus Albrecht
- Institut für Organische Chemie, RWTH Aachen, Landoltweg 1, 52074 Aachen (Germany).
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571
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McCoy AB. The Role of Electrical Anharmonicity in the Association Band in the Water Spectrum. J Phys Chem B 2014; 118:8286-94. [DOI: 10.1021/jp501647e] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anne B. McCoy
- Department
of Chemistry and
Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
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572
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Cortés-Guzmán F, Rocha-Rinza T, Guevara-Vela JM, Cuevas G, Gómez RM. Dynamic molecular graphs: "hopping" structures. Chemistry 2014; 20:5665-72. [PMID: 24692252 DOI: 10.1002/chem.201303287] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2013] [Indexed: 11/10/2022]
Abstract
This work aims to contribute to the discussion about the suitability of bond paths and bond-critical points as indicators of chemical bonding defined within the theoretical framework of the quantum theory of atoms in molecules. For this purpose, we consider the temporal evolution of the molecular structure of [Fe{C(CH2 )3 }(CO)3 ] throughout Born-Oppenheimer molecular dynamics (BOMD), which illustrates the changing behaviour of the molecular graph (MG) of an electronic system. Several MGs with significant lifespans are observed across the BOMD simulations. The bond paths between the trimethylenemethane and the metallic core are uninterruptedly formed and broken. This situation is reminiscent of a "hopping" ligand over the iron atom. The molecular graph wherein the bonding between trimethylenemethane and the iron atom takes place only by means of the tertiary carbon atom has the longest lifespan of all the considered structures, which is consistent with the MG found by X-ray diffraction experiments and quantum chemical calculations. In contrast, the η(4) complex predicted by molecular-orbital theory has an extremely brief lifetime. The lifespan of different molecular structures is related to bond descriptors on the basis of the topology of the electron density such as the ellipticities at the FeCH2 bond-critical points and electron delocalisation indices. This work also proposes the concept of a dynamic molecular graph composed of the different structures found throughout the BOMD trajectories in analogy to a resonance hybrid of Lewis structures. It is our hope that the notion of dynamic molecular graphs will prove useful in the discussion of electronic systems, in particular for those in which analysis on the basis of static structures leads to controversial conclusions.
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Affiliation(s)
- Fernando Cortés-Guzmán
- Instituto de Química, Universidad Nacional Autónoma de México, México D.F. 04510 (México); Centro Conjunto de Investigación en Química Sustentable, UAEMex-UNAM, Carretera Toluca-Atlacomulco km 14.5, Toluca, 50200 (México).
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573
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Deepa P, Sedlak R, Hobza P. On the origin of the substantial stabilisation of the electron-donor 1,3-dithiole-2-thione-4-carboxyclic acid···I2 and DABCO···I2 complexes. Phys Chem Chem Phys 2014; 16:6679-86. [PMID: 24584418 DOI: 10.1039/c4cp00055b] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The stabilisation energies of the crystal structures of 1,3-dithiole-2-thione-4-carboxyclic acid···I2 and DABCO···I2 complexes determined by the CCSD(T)/CBS method are very large and exceed 8 and 15 kcal mol(-1), respectively. The DFT-D method (B97-D3/def2-QZVP) strongly overestimates these stabilisation energies, which support the well-known fact that the DFT-D method is not very applicable to the study of charge-transfer complexes. On the other hand, the M06-2X/def2-QZVP method provides surprisingly reliable energies. A DFT-SAPT analysis has shown that a substantial stabilisation of these complexes arises from the charge-transfer energy included in the induction energy and that the respective induction energy is much larger than that of other non-covalently bound complexes. The total stabilisation energies of the complexes mentioned as well as of those where iodine has been replaced by lighter halogens (Br2 and Cl2) or by hetero systems (IF, ICH3, N2) correlate well with the magnitude of the σ-hole (Vs,max value) as well as with the LUMO energy. The nature of the stabilisation of all complexes between both electron donors and X2 (X = I, Br, Cl, N) systems is explained by the magnitude of the σ-hole but surprisingly also by the values of the electric quadrupole moment of these systems. Evidently, the nature of the stabilisation of halogen-bonded complexes between electron donors and systems where the first non-zero electric multipole moment is the quadrupole moment can be explained not only by the recently introduced concept of the σ-hole but also by the classical concept of electric quadrupole moments.
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Affiliation(s)
- Palanisamy Deepa
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 166 10 Prague 6, Czech Republic.
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574
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Gou Q, Spada L, Vallejo-López M, Kisiel Z, Caminati W. Interactions between freons: a rotational study of CH₂F₂-CH₂Cl₂. Chem Asian J 2014; 9:1032-8. [PMID: 24573907 DOI: 10.1002/asia.201301722] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2013] [Revised: 01/21/2014] [Indexed: 11/06/2022]
Abstract
The rotational spectra of two isotopologues of a 1:1 difluoromethane-dichloromethane complex have been investigated by pulsed-jet Fourier-transform microwave spectroscopy. The assigned (most stable) isomer has C(s) symmetry and it displays a network of two C-H⋅⋅⋅Cl-C and one C-H⋅⋅⋅F-C weak hydrogen bonds, thus suggesting that the former interactions are stronger. The hyperfine structures owing to (35)Cl (or (37)Cl) quadrupolar effects have been fully resolved, thus leading to an accurate determination of the three diagonal (χ(gg); g=a, b, c) and the three mixed quadrupole coupling constants (χ(gg'); g, g'=a, b, c; g≠g'). Information on the structural parameters of the hydrogen bonds has been obtained. The dissociation energy of the complex has been estimated to be 7.6 kJ mol(-1).
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Affiliation(s)
- Qian Gou
- Dipartimento di Chimica "G. Ciamician", Università di Bologna, Via Selmi 2, I-40126 Bologna (Italy), Fax: (+39) 0512099456
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575
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Mohan N, Suresh CH. A Molecular Electrostatic Potential Analysis of Hydrogen, Halogen, and Dihydrogen Bonds. J Phys Chem A 2014; 118:1697-705. [DOI: 10.1021/jp4115699] [Citation(s) in RCA: 95] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Neetha Mohan
- Inorganic and Theoretical
Chemistry Section, CSTD, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, India
| | - Cherumuttathu H. Suresh
- Inorganic and Theoretical
Chemistry Section, CSTD, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum 695 019, India
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576
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Boeré RT, Roemmele TL, Krall MK. A variable temperature X-ray diffraction investigation of [PPN+][S4N5-]: supramolecular interactions governing an order/disorder transformation and the first high resolution X-ray structure of the anion. Molecules 2014; 19:1956-75. [PMID: 24526253 PMCID: PMC6271633 DOI: 10.3390/molecules19021956] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Revised: 01/29/2014] [Accepted: 01/30/2014] [Indexed: 12/03/2022] Open
Abstract
The title salt, triphenyl(P,P,P-triphenylphosphineimidato-κN)-phosphorus(1+) 1,3,5,7-tetrathia(1,5-SIV)-2,4,6,8,9-pentaazabicyclo[3.3.1]nona-1,4,6,7-tetraene(1−), CAS [48236-06-2], prepared by the literature method, is found by crystallography to be a 1:1 CH3CN solvate. Disorder exists for the N atoms of the anion. A VT crystal structure study was conducted at 100 K, 120 K, 140 K, 172 K, 200 K, 240 K and 280 K. The 100 K structure is superior, with only 10% of a second anion position oppositely-oriented w.r.t the diad axis of point group 2mm. At 120 K, an adjacent two-site disorder is encountered, but at higher temperatures three-site disorder with both opposite and adjacent placements of S4N5− ions is required w.r.t. the primary component. At 240 and especially 280 K, the anion nitrogen atoms appear fully scrambled amongst the six possible sites on the edges of an S4 tetrahedron with 83.3% occupancy for each. The PPN+ geometry does not show strong cation-cation interactions. However, there are numerous supramolecular contacts corresponding mostly to non-classical H-bonds between PPN+ ions and S4N5− as well as CH3CN. The geometry of the anion is corroborated from B3LYP/6-311++G(3df) DFT calculations, and the infra-red spectrum was assigned with excellent agreement between experimental and calculated frequencies.
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Affiliation(s)
- René T Boeré
- Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge, AB T1K 3M4, Canada.
| | - Tracey L Roemmele
- Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge, AB T1K 3M4, Canada.
| | - Maria K Krall
- Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge, AB T1K 3M4, Canada.
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577
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Guillaumes L, Salvador P, Simon S. A fuzzy-atom analysis of electron delocalization on hydrogen bonds. J Phys Chem A 2014; 118:1142-9. [PMID: 24444143 DOI: 10.1021/jp4119869] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The extent of electron delocalization is quantified for set of cyclic complexes exhibiting two or more hydrogen bonds (HBs). In particular, the delocalization index (DI) between the atoms directly involved in the HB, and the ING (a normalized n-center delocalization index) have been evaluated using several fuzzy-atom schemes, namely Becke, Becke-ρ, Hirshfeld, and Hirshfeld-Iterative. The results have been compared with the widely used Quantum Theory of Atoms in Molecules (QTAIM) atomic definition. The DI values are found to correlate very well with geometrical or topological descriptors widely used in the literature to characterize HB systems. Among all fuzzy-atom methods, the ones that can better accommodate the different partial ionic character of the bonds perform particularly well. The best performing fuzzy-atom scheme for both pairwise and n-center electron delocalization is found to be the Becke-ρ method, for which similar results to QTAIM model are obtained with a much reduced computational cost. These results open up a wide range of applications of such electron delocalization descriptors based on fuzzy-atoms for noncovalent interactions in more complex and larger systems.
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Affiliation(s)
- L Guillaumes
- Institut de Química Computacional i Catàlisis (IQCC) and Departament de Química, Universitat de Girona , Campus de Montilivi, E-17071 Girona, Catalonia, Spain
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578
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Hansen AS, Du L, Kjaergaard HG. The effect of fluorine substitution in alcohol–amine complexes. Phys Chem Chem Phys 2014; 16:22882-91. [DOI: 10.1039/c4cp02500h] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect of fluorine substitution on the hydrogen bond strength in alcohol–amine molecular complexes was investigated, with a combination of vapour phase infrared and near infrared spectroscopy and theoretical calculations.
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Affiliation(s)
- Anne S. Hansen
- Department of Chemistry
- University of Copenhagen
- Universitetsparken 5
- DK-2100 Copenhagen, Denmark
| | - Lin Du
- Department of Chemistry
- University of Copenhagen
- Universitetsparken 5
- DK-2100 Copenhagen, Denmark
| | - Henrik G. Kjaergaard
- Department of Chemistry
- University of Copenhagen
- Universitetsparken 5
- DK-2100 Copenhagen, Denmark
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579
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Lipkowski P, Kozłowska J, Roztoczyńska A, Bartkowiak W. Hydrogen-bonded complexes upon spatial confinement: structural and energetic aspects. Phys Chem Chem Phys 2014; 16:1430-40. [DOI: 10.1039/c3cp53583e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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580
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Gamez P. The anion–π interaction: naissance and establishment of a peculiar supramolecular bond. Inorg Chem Front 2014. [DOI: 10.1039/c3qi00055a] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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581
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Yang S, Ma S, Wang C, Xu J, Zhu M. Polymer Complexation by Hydrogen Bonding at the Interface. Aust J Chem 2014. [DOI: 10.1071/ch13485] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Polymer complexes can form in the bulk and at interfaces. Polymer complex formation in the bulk has been studied for a long time. The recently developed layer-by-layer assembly technique well realizes polymer complexation at interfaces. The layer-by-layer assembly of polymers based on Coulomb forces or hydrogen bonding is a repeated complexation process conducted at a surface. This paper reviews both single (once only) and repeatable interfacial complexation by hydrogen bonding, the available hydrogen bonding pairs for complexation, the thermodynamics and kinetics of complexation, and construction schemes.
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582
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Singh S, Srivastava SK, Singh DK. Hydrogen bonding patterns in different acrylamide–water clusters: microsolvation probed by micro Raman spectroscopy and DFT calculations. RSC Adv 2014. [DOI: 10.1039/c3ra42707b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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583
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Vijaya Pandiyan B, Deepa P, Kolandaivel P. On the nature of non-covalent interactions in isomers of 2,5-dichloro-1,4-benzoquinone dimers – ground- and excited-state properties. Phys Chem Chem Phys 2014; 16:19928-40. [DOI: 10.1039/c4cp02484b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Impact of intermolecular NCIs (C–H⋯O, C–H⋯Cl, C–Cl⋯O, C–Cl⋯Cl–C, C–O⋯C, C–Cl⋯C and C–O⋯π) on chirality arrangement in the isomers of the 2,5-dichloro-1,4-benzoquinone (DCBQ) dimer.
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Affiliation(s)
| | - P. Deepa
- Department of Computational Chemistry
- Institute of Organic Chemistry and Biochemistry of the Academy of Sciences of the Czech Republic
- 166 10 Prague 6, Czech Republic
| | - P. Kolandaivel
- Department of Physics
- Bharathiar University
- Coimbatore, India
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584
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Muller L, Jackson SN, Woods AS. ETD and sequential ETD localize the residues involved in D2-A2A heteromerization. RSC Adv 2014. [DOI: 10.1039/c4ra04757e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
ETD2to identify binding site in NCX.
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Affiliation(s)
- Ludovic Muller
- Structural Biology Unit
- NIDA IRP
- NIH
- Baltimore, USA
- University of Pittsburgh
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585
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Azofra LM, Scheiner S. Complexes containing CO2and SO2. Mixed dimers, trimers and tetramers. Phys Chem Chem Phys 2014; 16:5142-9. [DOI: 10.1039/c3cp55489a] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two stable minima for the 1 : 1 heterodimer of CO2 : SO2, both bound by about 2 kcal mol−1. Binding is dominated by charge transfer from O lone pairs of SO2to CO π* antibonding orbitals.
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Affiliation(s)
- Luis Miguel Azofra
- Instituto de Química Médica
- CSIC
- Juan de la Cierva
- Madrid, Spain
- Department of Chemistry and Biochemistry
| | - Steve Scheiner
- Department of Chemistry and Biochemistry
- Utah State University
- Logan, USA
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586
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Skarmoutsos I, Welton T, Hunt PA. The importance of timescale for hydrogen bonding in imidazolium chloride ionic liquids. Phys Chem Chem Phys 2014; 16:3675-85. [DOI: 10.1039/c3cp54551b] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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587
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Tokushima T, Horikawa Y, Takahashi O, Arai H, Sadakane K, Harada Y, Takata Y, Shin S. Solvation dependence of valence electronic states of water diluted in organic solvents probed by soft X-ray spectroscopy. Phys Chem Chem Phys 2014; 16:10753-61. [DOI: 10.1039/c4cp00762j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The variety of occupied and unoccupied valence electronic states of water in organic solutions detected by X-ray absorption and emission spectroscopy.
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Affiliation(s)
- Takashi Tokushima
- RIKEN SPring-8 Center
- Soft X-ray Spectroscopy Instrumentation Unit
- Sayo, Japan
| | - Yuka Horikawa
- RIKEN SPring-8 Center
- Excitation Order Research Team
- Sayo, Japan
| | - Osamu Takahashi
- Institute for Sustainable Sciences and Development
- Hiroshima University
- Higashi-Hiroshima, Japan
| | - Hidemi Arai
- RIKEN SPring-8 Center
- Excitation Order Research Team
- Sayo, Japan
- Graduate School of Frontier Sciences
- The University of Tokyo
| | | | - Yoshihisa Harada
- RIKEN SPring-8 Center
- Excitation Order Research Team
- Sayo, Japan
- Institute for Solid State Physics (ISSP)
- The University of Tokyo
| | - Yasutaka Takata
- RIKEN SPring-8 Center
- Excitation Order Research Team
- Sayo, Japan
- Institute for Sustainable Sciences and Development
- Hiroshima University
| | - Shik Shin
- RIKEN SPring-8 Center
- Excitation Order Research Team
- Sayo, Japan
- Institute for Solid State Physics (ISSP)
- The University of Tokyo
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588
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Quiroz-Guzman M, Fagnant DP, Chen XY, Shi C, Brennecke JF, Goff GS, Runde W. Synthesis and characterization of the thermodynamic and electrochemical properties of tetra-alkyl phosphonium oxalate ionic liquids. RSC Adv 2014. [DOI: 10.1039/c4ra01467g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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589
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Lang J, Gaffga M, Menges F, Niedner-Schatteburg G. Two-color delay dependent IR probing of torsional isomerization in a [AgL1L2]+complex. Phys Chem Chem Phys 2014; 16:17417-21. [DOI: 10.1039/c4cp02045f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two-color infrared multiple photon dissociation (2c-IR-MPD) spectroscopy with delayed pulses indicates a torsional isomerization in a “ligand–metal–chelate” complex [AgL1L2]+.
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Affiliation(s)
- Johannes Lang
- Fachbereich Chemie and Forschungszentrum OPTIMAS
- Technische Universität Kaiserslautern
- 67663 Kaiserslautern, Germany
| | - Maximilian Gaffga
- Fachbereich Chemie and Forschungszentrum OPTIMAS
- Technische Universität Kaiserslautern
- 67663 Kaiserslautern, Germany
| | - Fabian Menges
- Fachbereich Chemie and Forschungszentrum OPTIMAS
- Technische Universität Kaiserslautern
- 67663 Kaiserslautern, Germany
| | - Gereon Niedner-Schatteburg
- Fachbereich Chemie and Forschungszentrum OPTIMAS
- Technische Universität Kaiserslautern
- 67663 Kaiserslautern, Germany
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590
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Bazarnik M, Brede J, Decker R, Wiesendanger R. Tailoring molecular self-assembly of magnetic phthalocyanine molecules on Fe- and Co-intercalated graphene. ACS NANO 2013; 7:11341-11349. [PMID: 24279797 DOI: 10.1021/nn405172q] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We investigate molecule-molecule, as well as molecule-substrate, interactions of phthalocyanine molecules deposited on graphene. In particular, we show how to tune the self-assembly of molecular lattices in two dimensions by intercalation of transition metals between graphene and Ir(111): modifying the surface potential of the graphene layer via intercalation leads to the formation of square, honeycomb, or Kagome lattices. Finally, we demonstrate that such surface induced molecular lattices are stable even at room temperature.
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Affiliation(s)
- Maciej Bazarnik
- Institute of Applied Physics, University of Hamburg , Jungiusstrasse 11, D-20355 Hamburg, Germany
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591
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Sakai H, Tokumasu T. Reaction Analysis for Deprotonation of the Sulfonic Group of Perfluorosulfonic Acid Molecules at Low Hydration Levels. J Phys Chem A 2013; 118:275-82. [DOI: 10.1021/jp409781s] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Hironori Sakai
- Institute
of Fluid Science, Tohoku University, 2-1-1, Katahira, Sendai, Miyagi, Japan
| | - Takashi Tokumasu
- Institute
of Fluid Science, Tohoku University, 2-1-1, Katahira, Sendai, Miyagi, Japan
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592
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Belashchenko DK, Rodnikova MN, Balabaev NK, Solonina IA. Investigating hydrogen bonds in liquid ethylene glycol structure by means of molecular dynamics. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2013. [DOI: 10.1134/s0036024414010063] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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593
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Rest C, Mayoral MJ, Fucke K, Schellheimer J, Stepanenko V, Fernández G. Self-Assembly and (Hydro)gelation Triggered by Cooperative π-π and Unconventional CH⋅⋅⋅X Hydrogen Bonding Interactions. Angew Chem Int Ed Engl 2013; 53:700-5. [DOI: 10.1002/anie.201307806] [Citation(s) in RCA: 114] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 10/14/2013] [Indexed: 11/10/2022]
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594
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Rest C, Mayoral MJ, Fucke K, Schellheimer J, Stepanenko V, Fernández G. Selbstorganisation und Bildung von (Hydro-)Gelen durch kooperative π-π-Wechselwirkungen und unkonventionelle C-H⋅⋅⋅X-Wasserstoffbrücken. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307806] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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595
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Moore KB, Migues AN, Schaefer HF, Vergenz RA. Streptococcal Hyaluronate Lyase Reveals the Presence of a Structurally Significant CH⋅⋅⋅O Hydrogen Bond. Chemistry 2013; 20:990-8. [DOI: 10.1002/chem.201303231] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Indexed: 02/06/2023]
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596
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Mączka M, Gągor A, Macalik B, Pikul A, Ptak M, Hanuza J. Order-disorder transition and weak ferromagnetism in the perovskite metal formate frameworks of [(CH3)2NH2][M(HCOO)3] and [(CH3)2ND2][M(HCOO)3] (M = Ni, Mn). Inorg Chem 2013; 53:457-67. [PMID: 24320242 DOI: 10.1021/ic402425n] [Citation(s) in RCA: 100] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the synthesis, crystal structure, thermal, dielectric, Raman, infrared, and magnetic properties of hydrogen and deuterated divalent metal formates, [(CH3)2NH2][M(HCOO)3] and [(CH3)2ND2][M(HCOO)3], where M = Ni, Mn. On the basis of Raman and IR data, assignment of the observed modes to respective vibrations of atoms is proposed. The thermal studies show that for the Ni compounds deuteration leads to a decrease of the phase transition temperature Tc by 5.6 K, whereas it has a negligible effect on Tc in the Mn analogues. This behavior excludes the possibility of proton (deuteron) movement along the N-H···O (N-D···O) bonds as the microscopic origin of the first-order phase transition observed in these crystals below 190 K. According to single-crystal X-ray diffraction, the dimethylammonium (DMA) cations are dynamically disordered at room temperature, because the hydrogen bonds between the NH2 (ND2) groups and the metal-formate framework are disordered. The highly dynamic nature of hydrogen bonds in the high-temperature phases manifests in the Raman and IR spectra through very large bandwidth of modes involving vibrations of the NH2 (ND2) groups. The abrupt decrease in the bandwidth and shifts of modes near Tc signifies the ordering of hydrogen bonds and DMA(+) cations as well as significant distortion of the metal-formate framework across the phase transition. However, some amount of motion is retained by the DMA(+) cation in the ferroelectric phase and a complete freezing-in of this motion occurs below 100 K. The dielectric studies reveal pronounced dielectric dispersion that can be attributed to slow dynamics of large DMA(+) cations. The low-temperature studies also show that magnetic properties of the studied compounds can be explained assuming that they are ordered ferrimagnetically with nearly compensated magnetic moments of Ni and Mn. IR data reveal weak anomalies below 40 K that arise due to spin-phonon coupling. Our results also show that due to structural phase transition more significant distortion of the metal-formate framework occurs for the deuterated samples.
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Affiliation(s)
- Mirosław Mączka
- Institute of Low Temperature and Structure Research , Polish Academy of Sciences, P.O. Box 1410, 50-950 Wrocław 2, Poland
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597
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Veryasov G, Morozov D, Goreshnik E, Jesih A. Synthesis and crystal structures of (pyH)2[Mo2O4F6] and (pipH2)[Mo2O4F6]; vibrational band assignment for [Mo2O4F6]2− anion. J Fluor Chem 2013. [DOI: 10.1016/j.jfluchem.2013.10.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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598
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Zhang G, He W, Chen D. On difference of properties between organic fluorine hydrogen bond C–H···F–C and conventional hydrogen bond. Mol Phys 2013. [DOI: 10.1080/00268976.2013.861085] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Guiqiu Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, China
| | - Wei He
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, China
| | - Dezhan Chen
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan, China
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599
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Chen X, Zhao JC, Shore SG. The roles of dihydrogen bonds in amine borane chemistry. Acc Chem Res 2013; 46:2666-75. [PMID: 24020948 DOI: 10.1021/ar400099g] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A dihydrogen bond (DHB) is an electrostatic interaction between a protonic hydrogen and a hydridic hydrogen. Over the past two decades, researchers have made significant progress in the identification and characterization of DHBs and their properties. In comparison with conventional hydrogen bonds (HBs), which have been widely used in catalysis, molecular recognition, crystal engineering, and supramolecular synthesis, chemists have only applied DHBs in very limited ways. Considering that DHBs and conventional HBs have comparable strength, DHBs could be more widely applied in chemistry. Over the past several years, we have explored the impact of DHBs on amine borane chemistry and the syntheses and characterization of amine boranes and ammoniated metal borohydrides for hydrogen storage. Through systematic computational and experimental investigations, we found that DHBs play a dominant role in dictating the reaction pathways (and thus different products) of amine boranes where oppositely charged hydrogens coexist for DHB formation. Through careful experiments, we observed, for the first time, a long-postulated reaction intermediate, ammonia diborane (AaDB), whose behavior is essential to mechanistic understanding of the formation of the diammoniate of diborane (DADB) in the reaction of ammonia (NH3) with tetrahydrofuran borane (THF·BH3). The formation of DADB has puzzled the boron chemistry community for decades. Mechanistic insight enabled us to develop facile syntheses of aminodiborane (ADB), ammonia borane (AB), DADB, and an inorganic butane analog NH3BH2NH2BH3 (DDAB). Our examples, together with those in the literature, reinforce the fact that DHB formation and subsequent molecular hydrogen elimination are a viable approach for creating new covalent bonds and synthesizing new materials. We also review the strong effects of DHBs on the stability of conformers and the hydrogen desorption temperatures of boron-nitrogen compounds. We hope that this Account will encourage further applications of DHBs in molecular recognition, host-guest chemistry, crystal engineering, supramolecular chemistry, molecular self-assembly, chemical kinetics, and the syntheses of new advanced materials.
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Affiliation(s)
- Xuenian Chen
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
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600
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Ramaniah LM, Kamal C, Kshirsagar RJ, Chakrabarti A, Banerjee A. How universal are hydrogen bond correlations? A density functional study of intramolecular hydrogen bonding in low-energy conformers of α-amino acids. Mol Phys 2013. [DOI: 10.1080/00268976.2013.770174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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