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Volumn 100, Issue 21, 1996, Pages 8786-8790

Theoretical and experimental studies on the bond dissociation energies of Al(methane)+, Al(acetylene)+, Al(ethene)+, and Al(ethane)+

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EID: 33751033149     PISSN: 00223654     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp960060k     Document Type: Article
Times cited : (28)

References (87)
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    • (a) Rüssel, D. H., Ed. Gas Phase Inorganic Chemistry; Plenum Press: New York, 1989.
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    • note
    • + amounts to 106.9 kcal/mol.:t> For more detailed discussions, see ref 8.
  • 67
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    • NSRDS-NBS 35: National Standards Reference Data Series; U.S. National Bureau of Standards: Washington. DC.
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    • and ref lia
    • A σ-bound complex with Al-C distances on the order of 1.6-1.8 A was not detected; see also ref 8b. However, note the predicted existence of an s-bound Sc(acetylene)+ complex (Bauschlicher, C. W., Jr.; Langhoff, S. R. J. Plm. Chem. 1991, 95, 2278 and ref lia).
    • (1991) J. Plm. Chem. , vol.95 , pp. 2278
    • Langhoff, S.R.1
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    • note
    • Wi'th regard to the Co(CH4)+ complexes, the (i;:) C2,. form was found to be a more stable minimum structure compared to the (>/') Cj,. coordination mode. The contrary findings for Co+ and Al+ may result from the dominating charge-induced polarization effects; see below and ref 1 Id. Similar aspects may be expected considering the Co(C:H6)+ and Al(C2Ho)+ isomers; however, a frequency analysis of Co(O>Ho)+ is not reported in ref lid.
  • 70
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    • The respective data of the free ligands can be obtained from the authors upon request
    • The respective data of the free ligands can be obtained from the authors upon request.
  • 72
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    • For experimental data on the structures of methane, acetylene, ethene, and ethane, see: Johnson, B. G.; Gill, P. M. W.; Pople, J. A. J. Chem. Phya. 1993, 98, 5612.
    • (1993) J. Chem. Phya. , vol.98 , pp. 5612
    • Johnson, B.G.1    Gill, P.M.W.2    Pople, J.A.3
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    • NBO is included in: Glendening, E. D.; Reed, A. E.; Carpenter, J. E.; Weinhold, F. GAUSSIAN 94, NBO Version 3.1
    • The NBO analysis was carried out on the optimized HF/6-31G-(d.p), MP2(FU)/6-31G(d.p), and QCISD(T)/6-31G(d,p) wave functions, whereas the latter results are taken throughout the discussion: Reed, A. E.; Curtiss, L. A.; Weinhold, F. Chem. Rev. 1988,88, 899. NBO is included in: Glendening, E. D.; Reed, A. E.; Carpenter, J. E.; Weinhold, F. GAUSSIAN 94, NBO Version 3.1.
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    • Reed, A.E.1    Curtiss, L.A.2    Weinhold, F.3
  • 74
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    • note
    • Additionally, the Mulliken charges for Al+ at the QCISD(T)/6-31G(d,p) level have been evaluated and amount to qu(l) = 0.954, qM(2) = 0.820,
  • 75
    • 33751068824 scopus 로고    scopus 로고
    • By using the Uppal-Staley relationship,8-81110 one obtains (BDE data in parentheses given in kcal/mol): CH4 (0.5) < QH6 (9) < CiHi (14) < C2H4 (15)
    • By using the Uppal-Staley relationship,8-81110 one obtains (BDE data in parentheses given in kcal/mol): CH4 (0.5) < QH6 (9) < CiHi (14) < C2H4 (15).
  • 76
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    • The collision rate, kcon, has been calculated according to the method described in: Su, T.; Chesnavich, W. J. J. Chem. Phys. 1982, 76, 5183.
    • (1982) J. Chem. Phys. , vol.76 , pp. 5183
    • Su, T.1    Chesnavich, W.J.2
  • 85
    • 33751059842 scopus 로고    scopus 로고
    • BDE(Al(C.Hi)+)/BDE(AI(CïH4)+) = 16.7/16.4 kcal/mol (basis set: 6-31G(d,p)), 12.6/12.8 (6-31 H-G(d.p)), and 13.7/13.7 (6-311++G-(3df.2p))
    • BDE(Al(C.Hi)+)/BDE(AI(CïH4)+) = 16.7/16.4 kcal/mol (basis set: 6-31G(d,p)), 12.6/12.8 (6-31 H-G(d.p)), and 13.7/13.7 (6-311++G-(3df.2p)).
  • 86
    • 33751030638 scopus 로고    scopus 로고
    • An even more pronounced effect has been obtained for Fe(Ni)+ and Fe(Xe)+ as is discussed in ref 40
    • An even more pronounced effect has been obtained for Fe(Ni)+ and Fe(Xe)+ as is discussed in ref 40.
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    • note
    • The error limits originate from the theoretical and experimental results: The QCISD(T)/6-311+G(3d,2p) method is effectively the same as G2; the latter was shown to yield accurate data within ±2 kcal/mol.22 The uncertainty of the kinetic method and the equilibrium measurements are expected to be smaller than ±2 kcal/mol due to cancellation of errors 3 and the negligible influence of pressure determinations, respectively.


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