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Photoassisted Magnetization of Fullerene C₆₀ with Magnetic-Field Trapped Raman Scattering

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Zhixun Luo†, Xiao Cheng‡, Yi Luo‡, Boon Hian Loo§, Aidong Peng†, and Jiannian Yao*†

^† Beijing National Laboratory for Molecular Science (Bnlms), and Key Laboratory of Photochemistry, Institute of Chemistry, The Chinese Academy of Sciences, Beijing, 100190, China

^‡ Theoretical Chemistry, Royal Institute of Technology, AlbaNova, S-106 91 Stockholm, Sweden and Hefei National Laboratory of Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China

^§ Department of Chemistry, Towson University, Towson, Maryland 21252, United States

J. Am. Chem. Soc., 2012, 134 (2), pp 1130–1135

DOI: 10.1021/ja209107u

Publication Date (Web): December 12, 2011

jnyao@iccas.ac.cn

Section:

Optical, Electron, and Mass Spectroscopy and Other Related Properties

Abstract

We report a photoassisted method to magnetize microcrystal fullerene C₆₀ at room temperature by exciting it to triplet states via a proper laser radiation and then trapping the spin-polarized states under a strong magnetic field. Novel changes on Raman scattering of the C₆₀ microcrystals were observed in the presence and absence of the magnetic field. In particular, the Raman spectra were found to exhibit a “hysteresis” phenomenon when the external magnetic field was removed. In light of this, we propose magnetic-field-trapped Raman spectroscopy (MFTRS) and employ first-principle calculations to reproduce the Raman activities of C₆₀ at different states. Further, MFTRS of the fullerene is demonstrated to originate from its photoassisted magnetization (PAM). The PAM strategy enables the magnetization of materials which consist of only light elements; meanwhile, the MFTRS investigation may open a new research field in Raman spectroscopy.

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