A photochemical on-off switch for tuning the equilibrium mixture of H 2 nuclear spin isomers as a function of temperature

Frunzi M, Jockusch S, Chen JYC, Krick Calderon R, Lei X, Murata Y, Komatsu K, Guldi DM, Lawler RG, Turro NJ (2011)

Publication Type: Journal article, Original article

Publication year: 2011

Journal

Journal of the American Chemical Society American Chemical Society

Original Authors: Frunzi M., Jockusch S., Chen J.Y.-C., Calderon R.M.K., Lei X., Murata Y., Komatsu K., Guldi D.M., Lawler R.G., Turro N.J.

Publisher: American Chemical Society

Book Volume: 133

Pages Range: 14232-14235

Journal Issue: 36

DOI: 10.1021/ja206383n

Abstract

The photochemical interconversion of the two allotropes of the hydrogen molecule [para-H (pH) and ortho-H (oH )] incarcerated inside the fullerene C (pH @C and oH@C, respectively) is reported. Photoexcitation of H@C generates a fullerene triplet state that serves as a spin catalyst for pH/oH conversion. This method provides a means of changing the pH/oH ratio inside C by simply irradiating H @C at different temperatures, since the equilibrium ratio is temperature-dependent and the electronic triplet state of the fullerene produced by absorption of the photon serves as an "on-off" spin catalyst. However, under comparable conditions, no photolytic pH /oH interconversion was observed for H @C, which was rationalized by the significantly shorter triplet lifetime of H@C relative to H @C. © 2011 American Chemical Society.

Authors with CRIS profile

Rafael Krick Calderon
Dirk Michael Guldi Lehrstuhl für Physikalische Chemie I

Additional Organisation(s)

Interdisziplinäres Zentrum für Molekulare Materialien

Involved external institutions

Columbia University US United States (USA) (US) Kyoto University / 京都大学 Kyōto daigaku JP Japan (JP) Fukui University of Technology / 福井工業大学 JP Japan (JP) Brown University US United States (USA) (US)

How to cite

APA:

Frunzi, M., Jockusch, S., Chen, J.Y.-C., Krick Calderon, R., Lei, X., Murata, Y.,... Turro, N.J. (2011). A photochemical on-off switch for tuning the equilibrium mixture of H 2 nuclear spin isomers as a function of temperature. Journal of the American Chemical Society, 133(36), 14232-14235. https://dx.doi.org/10.1021/ja206383n

MLA:

Frunzi, Michael, et al. "A photochemical on-off switch for tuning the equilibrium mixture of H 2 nuclear spin isomers as a function of temperature." Journal of the American Chemical Society 133.36 (2011): 14232-14235.

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