51
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McDowell SAC, Buckingham AD. Cooperative and diminutive hydrogen bonding in Y⋯HCN⋯HCN and NCH⋯Y⋯HCN trimers (Y=BF,CO,N2). J Chem Phys 2010; 132:064303. [PMID: 20151739 DOI: 10.1063/1.3297894] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Affiliation(s)
- Sean A C McDowell
- Department of Biological and Chemical Sciences, The University of the West Indies, Cave Hill Campus, P.O. Box 64, Bridgetown, Barbados.
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52
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Li AY, Ji HB, Cao LJ. Theoretical study on effects of hydrogen bonding on the ring stretching modes of pyridine. J Chem Phys 2009; 131:164305. [DOI: 10.1063/1.3251123] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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53
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Wang W, Ji B, Zhang Y. Chalcogen bond: a sister noncovalent bond to halogen bond. J Phys Chem A 2009; 113:8132-5. [PMID: 19537765 DOI: 10.1021/jp904128b] [Citation(s) in RCA: 418] [Impact Index Per Article: 27.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A sister noncovalent bond to halogen bond, termed chalcogen bond, is defined in this article. By selecting the complexes H(2)CS...Cl(-), F(2)CS...Cl(-), OCS...Cl(-), and SCS...Cl(-) as models, the bond-length change, interaction energy, topological property of the electron charge density and its Laplacian, and the charge transfer of the chalcogen bond have been investigated in detail theoretically. It was found that the similar misshaped electron clouds of the chalcogen atom and the halogen atom result in the similar properties of the chalcogen bond and the halogen bond. Experimental results are in good agreement with the theoretical predictions.
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Affiliation(s)
- Weizhou Wang
- College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471022, China
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54
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Das U, Raghavachari K. Predicting PH vibrations of gas phase molecules and surface-adsorbed species using bond length-frequency correlations. J Comput Chem 2009; 30:1872-81. [DOI: 10.1002/jcc.21187] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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55
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Zhou PP, Qiu WY. Red-Shifted Hydrogen Bonds and Blue-Shifted van der Waals Contact in the Standard Watson−Crick Adenine−Thymine Base Pair. J Phys Chem A 2009; 113:10306-20. [DOI: 10.1021/jp9035452] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Affiliation(s)
- Pan-Pan Zhou
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry, Lanzhou University, 222 South Tianshui Road, Lanzhou, P. R. China
| | - Wen-Yuan Qiu
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry, Lanzhou University, 222 South Tianshui Road, Lanzhou, P. R. China
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56
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Zhou PP, Qiu WY. Red- and Blue-Shifted Hydrogen Bonds in theCis-TransNoncyclic Formic Acid Dimer. Chemphyschem 2009; 10:1847-58. [DOI: 10.1002/cphc.200800870] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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57
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Lukyanov S, Akopyan S, Bertagnolli H, Leicht D. Solvent induced shifts of fundamental vibrational frequency and first overtone of CO+Ar solution. Monte-Carlo simulation. J Mol Liq 2009. [DOI: 10.1016/j.molliq.2008.10.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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58
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Parveen S, Chandra AK, Zeegers-Huyskens T. Theoretical Investigation of the Interaction between Fluorinated Dimethyl Ethers (nF = 1−5) and Water: Role of the Acidity and Basicity on the Competition between OH···O and CH···O Hydrogen Bonds. J Phys Chem A 2009; 113:6182-91. [PMID: 19422184 DOI: 10.1021/jp902244j] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Salma Parveen
- Department of Chemistry, North Eastern Hill University, Shillong 793022, India
| | - Asit K. Chandra
- Department of Chemistry, North Eastern Hill University, Shillong 793022, India
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59
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Mukhopadhyay A, Mukherjee M, Pandey P, Samanta AK, Bandyopadhyay B, Chakraborty T. Blue Shifting C−H···O Hydrogen Bonded Complexes between Chloroform and Small Cyclic Ketones: Ring-Size Effects on Stability and Spectral Shifts. J Phys Chem A 2009; 113:3078-87. [DOI: 10.1021/jp900473w] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anamika Mukhopadhyay
- Department of Physical Chemistry and Raman Center for Atomic Molecular and Optical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Moitrayee Mukherjee
- Department of Physical Chemistry and Raman Center for Atomic Molecular and Optical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Prasenjit Pandey
- Department of Physical Chemistry and Raman Center for Atomic Molecular and Optical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Amit K. Samanta
- Department of Physical Chemistry and Raman Center for Atomic Molecular and Optical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Biman Bandyopadhyay
- Department of Physical Chemistry and Raman Center for Atomic Molecular and Optical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Tapas Chakraborty
- Department of Physical Chemistry and Raman Center for Atomic Molecular and Optical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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60
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Strobel TA, Sloan ED, Koh CA. Raman spectroscopic studies of hydrogen clathrate hydrates. J Chem Phys 2009; 130:014506. [DOI: 10.1063/1.3046678] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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61
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Jabłoński M, Sadlej AJ. Influence of the external pressure on improper character of intramolecular C–H⋯O interactions. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.08.066] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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62
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63
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Michielsen B, Herrebout WA, van der Veken BJ. CH bonds with a Positive Dipole Gradient Can Form Blue-Shifting Hydrogen Bonds: The Complex of Halothane with Methyl Fluoride. Chemphyschem 2008; 9:1693-701. [DOI: 10.1002/cphc.200800263] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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64
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Wang W, Hobza P. Theoretical study on the complexes of benzene with isoelectronic nitrogen-containing heterocycles. Chemphyschem 2008; 9:1003-9. [PMID: 18389512 PMCID: PMC2970914 DOI: 10.1002/cphc.200700587] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2007] [Revised: 02/29/2008] [Indexed: 11/10/2022]
Abstract
The pi-pi interactions between benzene and the aromatic nitrogen heterocycles pyridine, pyrimidine, 1,3,5-triazine, 1,2,3-triazine, 1,2,4,5-tetrazine, and 1,2,3,4,5-pentazine are systematically investigated. The T-shaped structures of all complexes studied exhibit a contraction of the C--H bond accompanied by a rather large blue shift (40-52 cm(-1)) of its stretching frequency, and they are almost isoenergetic with the corresponding displaced-parallel structures at reliable levels of theory. With increasing number of nitrogen atoms in the heterocycle, the geometries, frequencies, energies, percentage of s character at C, and the electron density in the C--H sigma antibonding orbital of the complexes all increase or decrease systematically. Decomposition analysis of the total binding energy showed that for all the complexes, the dispersion energy is the dominant attractive contribution, and a rather large attraction originating from electrostatic contribution is compensated by its exchange counterpart.
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Affiliation(s)
| | - Pavel Hobza
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic and Centre for Biomolecules and Complex Molecular SystemsFlemingovo nám. 2, 166 10 Prague 6, Czech Republic, Fax: (+420) 220-410-320 E-mail:
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65
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Wang W, Hobza P. Origin of the X−Hal (Hal = Cl, Br) Bond-Length Change in the Halogen-Bonded Complexes. J Phys Chem A 2008; 112:4114-9. [PMID: 18345653 DOI: 10.1021/jp710992h] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Weizhou Wang
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic and Center for Biomolecules and Complex Molecular Systems, Flemingovo nám. 2, 166 10 Prague 6, Czech Republic
| | - Pavel Hobza
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic and Center for Biomolecules and Complex Molecular Systems, Flemingovo nám. 2, 166 10 Prague 6, Czech Republic
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66
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Liu G, Zhang X. Theoretical acquirement of the red shift of nu(FH) upon complexation with Ne. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 69:917-20. [PMID: 17604680 DOI: 10.1016/j.saa.2007.05.055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2006] [Accepted: 05/18/2007] [Indexed: 05/16/2023]
Abstract
Counterpoise (CP)-corrected geometry optimization and frequency calculation have been performed at MP2(FC) level of theory for the linear van der Waals complex FH...Ne. With the basis set 6-311++(2df, 3pd), CP-corrected frequency shift of nu(FH) is -0.4504 cm(-1), which agrees well with the experimental red shift of 0.4722 cm(-1).
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Affiliation(s)
- Guoqun Liu
- School of Materials and Chemical Engineering, Zhongyuan University of Technology, Zhongyuan Road 41(#), Zhengzhou 450007, China
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67
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Liu G, Zhao Y, Cao D. Argon matrix effect on the geometry and infrared spectrum of H2CMH2 (M=Ti, Zr, Hf): A theoretical study. J Organomet Chem 2008. [DOI: 10.1016/j.jorganchem.2007.12.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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68
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Chandra AK, Parveen S, Das S, Zeegers-Huyskens T. Blue shifts of the CH stretching vibrations in hydrogen-bonded and protonated trimethylamine. Effect of hyperconjugation on bond properties. J Comput Chem 2008; 29:1490-6. [DOI: 10.1002/jcc.20910] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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69
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Wang W, Hobza P. Application of Berlin's Theorem to Bond-Length Changes in Isolated Molecules and Red- and Blue-Shifting H-Bonded Clusters. ACTA ACUST UNITED AC 2008. [DOI: 10.1135/cccc20080862] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The origin of the bond-length change in molecule or molecular cluster has been investigated at the MP2/aug-cc-pVDZ level of theory using the electrostatic potential or the electron density difference analysis method. Our results have clearly shown that the bond-length change of a chemical bond is determined mainly by the balance of the electrostatic forces exerted by electrons on the two nuclei. The factors that affect the balance of the electrostatic forces include four parts: (i) The abstraction of the electron density from Berlin's binding region between the two nuclei. (ii) The accumulation of the electron density in Berlin's antibinding regions. (iii) The accumulation of the electron density in Berlin's binding region between the two nuclei. (iv) The abstraction of the electron density from Berlin's antibinding regions. Using the change of the electron density around the two nuclei of a chemical bond, we have succeeded in explaining two important chemical phenomena: (i) breakdown of bond length-bond strength correlation; (ii) the bond-length change in the hydrogen bond.
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70
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Jabłoński M. Blue-shifting intramolecular CH⋯O(S) contacts in sterically strained systems. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.theochem.2007.06.015] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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71
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Abstract
Two model systems, 3-methylacroleine and 3-(difluoromethyl)acroleine, are investigated computationally with respect to the character of the C-H...O interaction in their chelate-type (ZZ) conformers. By selecting the appropriate reference conformers, the C-H...O interaction is shown to result in the increase of the C-H stretching frequency (i.e., in the blue shift of the C-H stretching band). This is accompanied by the shortening of the C-H bond distance as compared to its values in reference molecules. Parallel to calculations of the C-H bond distance and stretching frequency, the energy contribution of the C-H...O interaction to the total energy (i.e., the energy associated with the C-H...O contact) is evaluated by using the methods proposed recently for the estimation of the energies of intramolecular hydrogen bonds. It is found that the C-H...O contact in the chelate-type forms of 3-methylacroleine and 3-(difluoromethyl)acroleine corresponds to the negative energy contribution and is repulsive. It is concluded that, despite the stability of the ZZ conformers of the two molecules and their deceptive structural shape, no hydrogen bond in the usual sense is formed between the C-H bond and the lone pair donor. The results are interpreted in terms of the steric compression, which leads to the dominance of the valence repulsion contribution in the C-H...O contact. This mechanism suggests that blue-shifting intramolecular interactions should not be that uncommon, although their recognition requires a careful consideration of the reference system.
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Affiliation(s)
- Mirosław Jabłoński
- Department of Quantum Chemistry, Institute of Chemistry, Nicolaus Copernicus University, PL-87 100 Toruń, Poland
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72
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Li AY. Chemical origin of blue- and redshifted hydrogen bonds: Intramolecular hyperconjugation and its coupling with intermolecular hyperconjugation. J Chem Phys 2007; 126:154102. [PMID: 17461609 DOI: 10.1063/1.2715561] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Upon formation of a H bond Y...H-XZ, intramolecular hyperconjugation n(Z)-->sigma*(X-H) of the proton donor plays a key role in red- and blueshift characters of H bonds and must be introduced in the concepts of hyperconjugation and rehybridization. Intermolecular hyperconjugation transfers electron density from Y to sigma*(X-H) and causes elongation and stretch frequency redshift of the X-H bond; intramolecular hyperconjugation couples with intermolecular hyperconjugation and can adjust electron density in sigma*(X-H); rehybridization causes contraction and stretch frequency blueshift of the X-H bond on complexation. The three factors--intra- and intermolecular hyperconjugations and rehybridization--determine commonly red- or blueshift of the formed H bond. A proton donor that has strong intramolecular hyperconjugation often forms blueshifted H bonds.
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Affiliation(s)
- An Yong Li
- School of Chemistry and Chemical Engineering, Southwest University, 400715 Chongqing, People's Republic of China.
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73
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Liu G, He T. Searching blue-shifted O–H···Y hydrogen bond in CH3OH complexes with CF4, C2F2, OC, Ne, and He: a theoretical study. Struct Chem 2007. [DOI: 10.1007/s11224-007-9183-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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74
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Li AY, Wang SW. Ab initio investigation of hydrogen bonds between pyridine and HCl, CHCl3. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.theochem.2006.12.035] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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75
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Joseph J, Jemmis ED. Red-, Blue-, or No-Shift in Hydrogen Bonds: A Unified Explanation. J Am Chem Soc 2007; 129:4620-32. [PMID: 17375920 DOI: 10.1021/ja067545z] [Citation(s) in RCA: 564] [Impact Index Per Article: 33.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We provide a simple explanation for X-H bond contraction and the associated blue shift and decrease of intensity in IR spectrum of the so-called improper hydrogen bonds. This explanation organizes hydrogen bonds (HBs) with a seemingly random relationship between the X-H bond length (and IR frequency and its intensity) to its interaction energy. The factors which affect the X-H bond in all X-H...Y HBs can be divided into two parts: (a) The electron affinity of X causes a net gain of electron density at the X-H bond region in the presence of Y and encourages an X-H bond contraction. (b) The well understood attractive interaction between the positive H and electron rich Y forces an X-H bond elongation. For electron rich, highly polar X-H bonds (proper HB donors) the latter almost always dominates and results in X-H bond elongation, whereas for less polar, electron poor X-H bonds (pro-improper HB donors) the effect of the former is noticeable if Y is not a very strong HB acceptor. Although both the above factors increase with increasing HB acceptor ability of Y, the shortening effect dominates over a range of Ys for suitable pro-improper X-Hs resulting in a surprising trend of decreasing X-H bond length with increasing HB acceptor ability. The observed frequency and intensity variations follow naturally. The possibility of HBs which do not show any IR frequency change in the X-H stretching mode also directly follows from this explanation.
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Affiliation(s)
- Jorly Joseph
- School of Chemistry, University of Hyderabad, Central University (P.O.), Hyderabad-500046, India
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76
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McDowell SAC. A comparative study of some red- and blue-shifted linear H-bonded complexes of N2. J Comput Chem 2007; 29:298-305. [PMID: 17573674 DOI: 10.1002/jcc.20792] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Bond length changes, harmonic vibrational frequency shifts, and changes in the proton magnetic shielding of HX and HKrX (X = F, Cl) on complexation with N2 to form the linear red-shifted N2 ... HX and linear blue-shifted N2 ... HKrX complexes were determined by ab initio computations, with and without counterpoise correction, at the SCF and MP2(full) levels of theory using a 6-311++G(2d,2p) basis set. The MP2 computations agree with predictions from a perturbation theory model involving the first and second derivatives of the interaction energy with respect to displacement of the H--X and H--Kr bond lengths from their equilibrium values in the isolated monomers. The theoretical results agree qualitatively with the experimentally observed frequency shifts, with near quantitative agreement for N2 ... HKrCl. The characteristic downfield shift of the isotropic proton magnetic resonance in the red-shifted complexes was obtained, but for the blue-shifted complexes, the proton NMR shifts to higher fields.
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Affiliation(s)
- Sean A C McDowell
- Department of Biological and Chemical Sciences, The University of the West Indies, Cave Hill Campus, Barbados.
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77
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The change of the proton magnetic shielding in red- and blue-shifted linear hydrogen-bonded complexes. Theor Chem Acc 2006. [DOI: 10.1007/s00214-006-0182-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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78
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Deakyne CA, Corum AK, Thomas HM, Liebman JF. The structure and energetics of singlet, closed-shell [B, C, F, H2]: Simplicity resulting in diversity. J Fluor Chem 2006. [DOI: 10.1016/j.jfluchem.2006.07.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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79
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Rutkowski K, Rodziewicz P, Melikova S, Koll A. Theoretical study of Hal3CH/F2CD2 (Hal=F,Cl) and F3CH/FH heterodimers with blue shifted hydrogen bonds. Chem Phys 2006. [DOI: 10.1016/j.chemphys.2006.04.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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80
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Harmonic vibrational blue shifts in FXeH…Y complexes (Y=N2, CO, BF and HF) predicted by a perturbative model. Chem Phys 2006. [DOI: 10.1016/j.chemphys.2006.06.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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81
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82
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Li AY. Theoretical Investigation of Hydrogen Bonds between CO and HNF2, H2NF, and HNO. J Phys Chem A 2006; 110:10805-16. [PMID: 16970375 DOI: 10.1021/jp062291p] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ab initio quantum mechanics methods were applied to investigate the hydrogen bonds between CO and HNF2, H2NF, and HNO. We use the Hartree-Fock, MP2, and MP4(SDQ) theories with three basis sets 6-311++G(d,p), 6-311++G(2df,2p), and AUG-cc-pVDZ, and both the standard gradient and counterpoise-corrected gradient techniques to optimize the geometries in order to explore the effects of the theories, basis sets, and different optimization methods on this type of H bond. Eight complexes are obtained, including the two types of C...H-N and O...H-N hydrogen bonds: OC...HNF2(C(s)), OC...H2NF(C(s) and C1), and OC...HNO(C(s)), and CO...HNF2(C(s)), CO...H2NF(C(s) and C1), and CO...HNO(C(s)). The vibrational analysis shows that they have no imaginary frequencies and are minima in potential energy surfaces. The N-H bonds exhibit a small decrease with a concomitant blue shift of the N-H stretch frequency on complexation, except for OC...HNF2 and OC...H2NF(C1), which are red-shifting at high levels of theory and with large basis sets. The O...H-N hydrogen bonds are very weak, with 0 K dissociation energies of only 0.2-2.5 kJ/mol, but the C...H-N hydrogen bonds are stronger with dissociation energies of 2.7-7.0 kJ/mol at the MP2/AUG-cc-pVDZ level. It is notable that the IR intensity of the N-H stretch vibration decreases on complexation for the proton donor HNO but increases for HNF2 and H2NF. A calculation investigation of the dipole moment derivative leads to the conclusion that a negative permanent dipole moment derivative of the proton donor is not a necessary condition for the formation of the blue-shifting hydrogen bond. Natural bond orbital analysis shows that for the C...H-N hydrogen bonds a large electron density is transferred from CO to the donors, but for the O...H-N hydrogen bonds a small electron density transfer exists from the proton donor to the acceptor CO, which is unusual except for CO...H2NF(C(s)). From the fact that the bent hydrogen bonds in OC(CO)...H2NF(C(s)) are quite different from those in the others, we conclude that a greatly bent H-bond configuration shall inhibit both hyperconjugation and rehybridization.
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Affiliation(s)
- An Yong Li
- School of Chemistry and Chemical Engineering, Southwestern University, 400715, ChongQing, P R China.
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83
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McDowell SAC, Buckingham AD. Shift of proton magnetic shielding in ClH ··· Y dimers (Y = N2, CO, BF). Mol Phys 2006. [DOI: 10.1080/00268970600805262] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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84
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Blue and red shifts in F3C–H⋯B (B=FH, ClH, OH2, SH2 and Cl−) complexes predicted by a perturbative model. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.04.047] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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85
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Spirko V, Hobza P. Theoretical Investigations into the Blue-Shifting Hydrogen Bond in Benzene Complexes. Chemphyschem 2006; 7:640-3. [PMID: 16514693 DOI: 10.1002/cphc.200500565] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The benzene...X complexes (X=benzene, antracene, ovalene) were optimised at the MP2/6-31G** level with the C2v symmetry of the complex and planarity of the proton acceptor being preserved. The resulting stabilisation energies amount to 1.2, 2.3 and 2.9 kcal mol(-1), and the C-H bond of the proton donor is contracted by 0.0035, 0.0052 and 0.0055 A, respectively. The contraction is connected with a blue-shift of the C-H stretch vibration frequency. A two-dimensional anharmonic vibration treatment based on a MP2/6-31G** potential energy surface yields the following blue shifts for the complexes studied: 28, 42 and 43 cm(-1). The dominant attraction in the complexes is London dispersion, while the attractive contribution from electrostatic quadrupole-quadrupole interactions is considerably smaller.
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Affiliation(s)
- Vladimír Spirko
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic and Centre for Biomolecules and Complex Molecular Systems, 166 10 Prague 6, Czech Republic
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Khoroshun DV, Musaev DG, Morokuma K. Electronic reorganization: Origin of sigma trans promotion effect. J Comput Chem 2006; 28:423-41. [PMID: 17143866 DOI: 10.1002/jcc.20551] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Binding of two ligands trans to each other by some transition metal complexes may be cooperative [Khoroshun et al., Mol Phys 2002, 100, 523]. Several interesting consequent effects include (i) inverse relationship between bond strength and binding affinity; (ii) smaller coordination barriers to formation of weaker bonds; (iii) enhancement of Lewis acidity with increased number of ligands. We describe a simple model, sigma trans promotion effect (TPE), which considers electronic reorganization between two Lewis structures, and predicts the above-mentioned effects. The applied result of present study is the unified perspective on several facts of heme chemistry. Particularly, we reiterate an important but often overlooked notion, developed previously within the spin pairing model [Drago and Corden, Acc Chem Res 1980, 13, 353], that, in hemoproteins, the proximal histidine and the distal ligand such as O2 or CO cooperate in promoting electronic reorganization. As a result, depopulation of dz2 orbital upon ligand binding contributes to the phenomenon of hemoglobin cooperativity. The presented density functional (B3LYP) calculations on realistic models, the processes of carbon monoxide binding by Fe(II) porphyrins and dinitrogen binding by triamido/triamidoamine Mo(III) complexes, particularly the evaluation of the coordination barriers due to spin-state change by location of the minima on seams of crossing, support the TPE model predictions. From a broader theoretical perspective, the present study would hopefully stimulate the development of much needed frameworks and tools for facile comparisons of wave functions and their properties between different geometries, species, and electronic states. Advancement of practical wave function comparisons may yield fresh qualitative perspectives on chemical reactivity, and promote better understanding of related concepts such as electronic reorganization.
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Affiliation(s)
- Dmitry V Khoroshun
- Cherry L. Emerson Center for Scientific Computation, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, USA
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Alabugin IV, Manoharan M. Rehybridization as a general mechanism for maximizing chemical and supramolecular bonding and a driving force for chemical reactions. J Comput Chem 2006; 28:373-90. [PMID: 17143865 DOI: 10.1002/jcc.20524] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Dynamic variations in hybridization patterns (rehybridization) were analyzed at B3LYP/6-31G** and MP2/6-31+G* levels. Computations clearly illustrate the generality of rehybridization in a variety of chemical phenomena, which involve structural reorganization in hydrogen-bonded complexes, nonhyperconjugative stereoelectronic effects in saturated heterocycles, Mills-Nixon effect, and contrasting substituent effects in cycloaromatization reactions.
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Affiliation(s)
- Igor V Alabugin
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, USA.
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