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Volumn 105, Issue 18, 2001, Pages 4470-4479

C-H⋯X hydrogen bonds of acetylene, ethylene, and ethane with first - and second row hydrides

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Indexed keywords

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EID: 0035837964     PISSN: 10895639     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp001672e     Document Type: Article
Times cited : (125)

References (219)
  • 2
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    • (b) Allerhand, A.; Schleyer, P. v. R. J. Am. Chem. Soc. 1963,85, 1715-1723, and references therein.
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    • Dissertation; Georg-August Universität: Göttingen
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    • note
    • Due to the very weak interaction expected for C-H-X hydrogenbonded complexes involving ethane and first- and especiafly second-row hydrides, we comment in this paper only on the results obtained for the two most stable HjC-CHs-X complexes, namely HsC-CHs-NHj and HjC-CHj-OH2:
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    • Labanowski, J. K., Andzelm, J. W., Eds.; Springer-Verlag: New York
    • (c) Density Functional Methods in Chemistry; Labanowski, J. K., Andzelm, J. W., Eds.; Springer-Verlag: New York, 1991.
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    • MOLPRO 98 is a package of ab initio programs written by Wemer, H.-J.; Knowes, P. J. with contributions from Amos, R. D.; Berning, A.; Cooper, D. L.; Deegan, M. J. O.; Dobbyn, A. J.; Eckert, F.; Elbert, S. T.; Hampel, C.; Lindh, R.; Lloyd, A. W.; Meyer, W.; Nickless, A.; Peterson, K.; Pitzer, R.; Stone, A. J.; Taylor, P. R.; Mura, M. E.; Pulay, P.; Schütz, M.; Stoll, H.; Thorsteinsson, T.
    • (a) MOLPRO 98 is a package of ab initio programs written by Wemer, H.-J.; Knowes, P. J. with contributions from Amos, R. D.; Berning, A.; Cooper, D. L.; Deegan, M. J. O.; Dobbyn, A. J.; Eckert, F.; Elbert, S. T.; Hampel, C.; Lindh, R.; Lloyd, A. W.; Meyer, W.; Nickless, A.; Peterson, K.; Pitzer, R.; Stone, A. J.; Taylor, P. R.; Mura, M. E.; Pulay, P.; Schütz, M.; Stoll, H.; Thorsteinsson, T.
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    • MOLPRO 2000 is a package of ab initio programs written by Werner, H.-J. and Knowles, P. J with contributions from Amos, R. D.; Bernhardsson, A.; Berning, A.; Celani, P.; Cooper, D. L.; Deegan, M. J. O.; Dobbyn, A. J.; Eckert, F.; Hampel, C.; Hetzer, G.; Korona, T.; Lindh, R.; Lloyd, A. W.; McNichoIas, S. J.; Manby, F. R.; Meyer, W.; Mura, M. E.; Nicklass, A.; Palmieri, P.; Pitzer, R.; Rauhut, G.; Schütz, M.; Stoll, H.; Stone, A. J.; Tarroni, R.; Thorsteinsson, T.
    • (b) MOLPRO 2000 is a package of ab initio programs written by Werner, H.-J. and Knowles, P. J with contributions from Amos, R. D.; Bernhardsson, A.; Berning, A.; Celani, P.; Cooper, D. L.; Deegan, M. J. O.; Dobbyn, A. J.; Eckert, F.; Hampel, C.; Hetzer, G.; Korona, T.; Lindh, R.; Lloyd, A. W.; McNichoIas, S. J.; Manby, F. R.; Meyer, W.; Mura, M. E.; Nicklass, A.; Palmieri, P.; Pitzer, R.; Rauhut, G.; Schütz, M.; Stoll, H.; Stone, A. J.; Tarroni, R.; Thorsteinsson, T.
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    • 7/7
    • Reference values were taken from the compilation of best available ZPVEs reported by Martin, J. M. L.; de Oliveira, G. J. Chem. Phys. 1999, 7/7, 1843-1856. Consistent with this work, the reference value for the ZPVE for ethane was obtained from the B3-LYP/cc-pVTZ vibrational frequencies using a scale factor of 0.985.
    • (1999) J. Chem. Phys. , pp. 1843-1856
    • Martin, J.M.L.1    De Oliveira, G.2
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    • note
    • 4 complex. We previously found negligible differences between the CCSD(T)/6-31 l+G(2df,2p) and CCSD-(T)/6-311+G(3df,2p) geometries for the acetylene-ammonia complex,7 whereas the smaller basis set leads to a substantial saving in computer time.
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    • Lipkowitz, K. B., Boyd, D. B., Eds.; VCH-Publishers, Inc.: New York
    • (c) Scheiner, S. In Reviews in Computational Chemistry; Lipkowitz, K. B., Boyd, D. B., Eds.; VCH-Publishers, Inc.: New York, 1991; Vol. 2,165-218.
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    • (e) Kestner, N. R.; Combariza, J. E. In Reviews in Computational Chemistry; Lipkowitz, K. B., Boyd, D. B., Eds.; VCH-Publishers, Inc.: New York, 1999; vol. 13, 99-132.
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    • note
    • 3 (e) complexes (1.3, 0.5, 0.6, and 0.7 kj mol'1, respectively).
  • 192
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    • The maximum lengthening of the intramolecular bond between the acceptor X and hydrogen in these cases is 0.001 Å. The corresponding ∠HXH angles are widened by up to 0.5° or diminished by up to 0.2°
    • The maximum lengthening of the intramolecular bond between the acceptor X and hydrogen in these cases is 0.001 Å. The corresponding ∠HXH angles are widened by up to 0.5° or diminished by up to 0.2°.
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    • For this comparison, several different sets of van der Waals radii were chosen: (a) Pauling, L. The Nature of the Chemical Bond, 3rd ed.; Cornell University Press: Ithaca, New York, 1960; p 260.
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    • In the absence of experimental evidence for the 'exact' position of the hydrogen atom between C and X, the C⋯X separation is often used as a geometrical criterion for the existence of C-H⋯X hydrogen bonds (see ref 4)
    • In the absence of experimental evidence for the 'exact' position of the hydrogen atom between C and X, the C⋯X separation is often used as a geometrical criterion for the existence of C-H⋯X hydrogen bonds (see ref 4).
  • 202
    • 85037306789 scopus 로고    scopus 로고
    • note
    • s symmetry) with water acting as the proton donor and involving an O-H⋯π rather than a C-H⋯O interaction was found to be slightly less stable than the nonplanar hydrogen-bonded complex by 3.4 kj mor1 on the BSSE-corrected CCSD(T)/6-311-f G(3df,2p)//MP2/ 6-31 l+G(3df,2p) surface. The intermolecular contact distance between the donor hydrogen and the midpoint of the acetylenic triple bond is calculated to be 2.334 Å. The conversion of the O-H⋯π complex to the C-H⋯O complex is determined to be almost barrierless. These results are in accord with the very flat potential surface in this region (see also refs 11 and 15).
  • 203
    • 85037322844 scopus 로고    scopus 로고
    • note
    • -1) at the CCSD(T)/6-31 l+G(3df,2p)//MP2/6-31 l+G(3df,2p) level than the planar Cirsymmetric arrangement (Figure Id).
  • 204
    • 0032394732 scopus 로고    scopus 로고
    • Other examples where the inclusion of BSSE has led to modified global minima have also been presented in the literature. (See, for example: (a) Hobza, P.; Havlas, Z. Collect. Czech. Chem. Commun. 1998, 63, 1343-1354
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    • Hobza, P.1    Havlas, Z.2
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    • (b) Sadlej, J.; Mazurek, P. J. Mot. Struct. 1995, 337, 129-138.) In fact, it has been shown that both the location of potential minima and the vibrational frequencies can be dependent on the inclusion of BSSE. (See, for example:
    • (1995) J. Mot. Struct. , vol.337 , pp. 129-138
    • Sadlej, J.1    Mazurek, P.2
  • 207
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    • and ref 56b.
    • -1 below the nonplanar geometry. Due to the well-documented importance of BSSE corrections, we can feel confident that the BSSE-corrected geometries are more reliable (see also refs 14 and 15). For examples of improved agreement with experiment when the BSSE-corrected potential energy surface is considered, see (a) Hobza, P.; Bludsky, O.; Suhai, S. Phys. Chem. Chem. Phys. 1999, J, 3073-3078 and ref 56b.
    • (1999) Phys. Chem. Chem. Phys. , pp. 3073-3078
    • Hobza, P.1    Bludsky, O.2    Suhai, S.3
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    • 85037299420 scopus 로고    scopus 로고
    • note
    • -1 on the BSSE-corrected surface. The bond distance between the donor hydrogen and the midpoint of the acetylenic triple bond is calculated to be 2.115 A. The conversion of the C-H⋯F hydrogen-bonded complex into the T-shaped H-F⋯πT complex is found to be almost barrierless.
  • 210
    • 85037299223 scopus 로고    scopus 로고
    • 2O, and HF, which correlate nicely with the proton affinities of the proton acceptor
    • 2O, and HF, which correlate nicely with the proton affinities of the proton acceptor.
  • 211
    • 85037321722 scopus 로고    scopus 로고
    • note
    • 23 On both the MP2/6-31 l+G(3df,2p) and the B3-LYP/6-31 l+G(3df,2p) surfaces, the conversion of the C-H⋯Cl hydrogen-bonded complex into the Cl-H⋯π complex is almost barrierless. Refined CCSD(T)/6-311+ G(3df,2p) energy calculations predict the transition structure to lie lower in energy than the C-H⋯Cl form, suggesting again a barrierless transformation to the Cl-H⋯π complex.
  • 212
    • 85037326347 scopus 로고    scopus 로고
    • note
    • 24a The bond distance between the.donor hydrogen and the midpoint of the ethylenic double bond is calculated to be 2.376 Å, compared with an experimental value of 2.48 Å.
  • 213
    • 85037306530 scopus 로고    scopus 로고
    • note
    • -1.
  • 214
    • 85037323821 scopus 로고    scopus 로고
    • note
    • -1). However, both structures represent local minima on the B3-LYP surface.
  • 215
    • 85037315795 scopus 로고    scopus 로고
    • note
    • 2⋯FH, are dominated by the displacement of hydrogen in the proton acceptor out of the molecular plane.


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