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Acta Chimica Sinica >

2012 , Vol. 70 >Issue 12: 1337 - 1346

DOI: https://doi.org/10.6023/A1112302

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Density functional investigation on the Reaction Mechanisms of Oxidative Activation of Dihydrogen by Osmium Oxide Cation in Gas Phase

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  • The MOE Key Laboratory for the Synthesis and Application of Organic Functional Molecules, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, China

Received date: 2011-12-30

  Revised date: 2012-05-04

  Online published: 2012-05-10

Supported by

This project was supported by the State Key Laboratory of Physical Chemistry of Solid Surfaces at Xiamen University.

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Abstract

Density functional calculations with UB3LYP functional and an extended ECP basis set are employed to Calculate the geometries and energies for all possible reactants, intermediates, transition states and products on sextet, quartet and doublet surfaces in four pathways of addition (oxidative addition and [2+2]cycloaddition)-elimination, abstraction-rebound and oxene-insertion for investigating the mechanisms of oxidative activation of dihydrogen by osmium oxide cation. From the results calculated, the titled reaction is spin-forbidden, which starts on the quartet surface and ends on sextet surface, the overall reaction is exothermic by 21.0 kJ·mol-1. Oxene-insertion process is unfavorable thermodynamically due to more positive Gibbs free energy for the reactant complexes. The other three mechanisms proposed exhibit multiple-state-reactivity (MSR) or two-state-reactivity (TSR). Individually the surfaces in three spin states for the two addition-elimination pathways may cross over three times, while the sextet and quartet surfaces for abstraction-rebound may cross once, respectively. The abstraction-rebound mechanism starts on the H-abstraction process with uphill potential surfaces and high endothermicity, followed by a barrierless and highly exothermic rebound of H atom, thus it cannot take place at normal temperature. While the two addition-elimination processes have the same rate-determining step, where each barrier is about 156.9 kJ·mol-1,which is a little higher than that for the usual reactions in liquid, however it is possible to take place due to coupling with the highly exothermic steps before. Furthermore, the concerted [2+2] cycloaddition step has a lower barrier of only 28.7 kJ·mol-1, which is 113.7 kJ·mol-1 lower than that for the step of the reductive elimination of the first hydride in oxidative addition-elimination process. Thus, [2+2] cycloaddition process is more favorable than oxidative addition process kinetically.

Key words： density functional calculations; multiple-state-reactivity; dihydrogen activation by osmium oxide cation; oxidative addition-reductive elimination mechanism; [2+2] cycloaddition of dihydrogen across to Os=O; H- abstraction-rebound mechanism; oxene-insertion mechanism

Cite this article

Liu Qiong, Wang Pei, Zhang Ganbing . Density functional investigation on the Reaction Mechanisms of Oxidative Activation of Dihydrogen by Osmium Oxide Cation in Gas Phase[J]. Acta Chimica Sinica, 2012 , 70(12) : 1337 -1346 . DOI: 10.6023/A1112302

References

1 (a) Nishimura, S. Handbook of Heterogeneous Catalytic Hydrogenation for Organic Synthesis, Wiley, Chichester, UK, 2001. (b) de Vries, J. G.; Elsevier, C. J. The Handbook of Homogeneous Hydrogenation, Wiley-VCH, Weinheim, 2007.

2 Zhao, J.-Q. Homogeneous Complex Catalysis—Activation of Small Molecules, Chemical Industrial Press, Beijing, 2011 (in Chinese). (赵继全, 均相络合催化: 小分子的活化, 化学工业出版社, 北京, 2011.)

3 Kubas, G. J. Chem. Rev. 2007, 107, 4152.

4 Roithová, J.; Schröder, D. Chem. Rev. 2010, 110, 1170.

5 Schröder, D.; Schwarz, H. Angew Chem. Int. Ed. Engl. 1995, 34, 1973.

6 Bohme, D. K.; Schwarz, H. Angew. Chem. Int. Ed. 2005, 44, 2336.

7 Schröder, D.; Schwarz, H. PNAS 2008, 105, 18114.

8 Kappes, M. M.; Staley, R. H. J. Phys. Chem. 1981, 85, 942.

9 Schröder, D.; Fiedler, A.; Ryan, M. F.; Schwarz, H. J. Phys. Chem.1994, 98, 68.

10 Clemmer, D. E.; Chen, Y. M.; Khan, F. A.; Armentrout, P. B. J. Phys. Chem. 1994, 98, 6522.

11 Baranov, V. I.; Javahery, G.; Hopkinson, A. C.; Bohme, D. K. J. Am. Chem. Soc. 1995, 117, 12801.

12 Schröder, D.; Schwarz, H.; Clemmer, D. E.; Chen, Y. M.; Armentrout, P. B.; Baranov, V. I.; Böhme, D. K. Int. J. Mass Spectrom. and Ion Processes 1997, 161, 175.

13 Ryan, M. F.; Fiedler, A.; Schröder, D.; Schwarz, H. J. Am. Chem. Soc. 1995, 117, 2033.

14 Ryan, M. F.; Fiedler, A.; Schröder, D.; Schwarz, H. Organometallics 1994, 13, 4072.

15 Kang, H.; Beauchamp, J. L. J. Am. Chem. Soc. 1986, 108, 5663.

16 Fiedler, A.; Kretzschmar, H.; Schroder, D.; Schwarz, H. J. Am. Chem. Soc. 1996, 118, 9941.

17 Chen, X.-X.; Wang, Y.-C.; Geng, Z.-Y.; Gao, L.-G.; Fang, R.; Zhang, X.-H. Acta Phys.-Chim. Sin. 2006, 22, 59 (in Chinese). (陈晓霞, 王永成, 耿志远, 高立国, 方冉, 张兴辉, 物理化学学报, 2006, 22, 59.)

18 Fiedler, A.; Schröder, D.; Shaik, S.; Schwarz, H. J. Am. Chem. Soc. 1994, 116, 10734.

19 Danovich, D.; Shaik, S. J. Am. Chem. Soc. 1997, 119, 1773.

20 Filatov, M.; Shaik, S. J. Phys. Chem. A 1998, 102, 3835.

21 Irikura, K. K.; Beauchamp, J. L. J. Am. Chem. Soc. 1989, 111, 75.

22 Blagojevic, V.; Bozovic, A.; Orlova, G.; Bohme, D. K. J. Phys. Chem. A 2008, 112, 10141.

23 Dai, G.-L.; Gao, L.-G.; Wang, Y.-C.; Fan, K.-N. Acta Chim. Sinica 2007, 65, 509 (in Chinese). (戴国梁, 高立国, 王永成, 范康年, 化学学报, 2007, 65, 509.)

24 (a) Stephens, P. J.; Devlin, F. J.; Chabalowski, C. F.; Frisch, M. J. J. Phys. Chem. 1994, 98,11623. (b) Becke, A. D. J. Chem. Phys. 1993, 98, 5648. (c) Lee, C.; Yang, W.; Parr, R. G. Phys. Rev. B 1988, 37, 785.

25 (a) Hay, P. J.; Wadt, W. R. J. Chem. Phys. 1985, 82, 270. (b) Wadt, W. R.; Hay, P. J. J. Chem. Phys. 1985, 82, 284. (c) Hay, P. J.; Wadt, W. R. J. Chem. Phys. 1985, 82, 299.

26 Couty, M.; Hall, M. B. J. Comput. Chem. 1996, 17, 1359.

27 Ehlers, A. W.; Böhme, M.; Dapprich, S.; Gobbi, A.; Höllwarth, A.; Jonas, V.; Köhler, K. F.; Stegmann, R.; Veldkamp, A.; Frenking, G. Chem. Phys. Lett. 1993, 208, 111.

28 Zhang, G.-B.; Li, S.-H.; Jiang, Y.-S. Organometallics 2003, 22(19), 3820.

29 Zhang, G.-B.; Li, S.-H.; Jiang, Y.-S. Organometallics 2004, 23(15), 3656.

30 Berkowitz, J.; Ellison, G. B.; Gutman, D. J. Phys. Chem. 1994, 98, 2744.

31 Dillard, J. G.; Kiser, R. W. J. Phys. Chem. 1965, 69, 3893.
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