Anisotropic Magnetic Behavior of Anionic Ce@C-82 Carbene Adducts

作者：Takano Yuta; Aoyagi Motoki; Yamada Michio; Nikawa Hidefumi; Slanina Zdenek; Mizorogi Naomi; Ishitsuka Midori O; Tsuchiya Takahiro; Maeda Yutaka; Akasaka Takeshi^*; Kato Tatsuhisa; Nagase Shigeru

来源：Journal of the American Chemical Society, 2009, 131(26): 9340-9346.

DOI：10.1021/ja902106a

Derivatives of Ce@C-82(C-2v) have been synthesized and fully characterized, and their anisotropic magnetism has been observed as paramagnetic shifts in NMR measurements. Carbene addition by photochemical reaction afforded two isomers of Ce@C-82(C-2v)Ad (Ad = adamantylidene), 2a and 2b, demonstrating high regioselectivity. The two isomers were characterized using MALDI-TOF mass spectrometry, vis-NIR absorption spectroscopy, H-1 and C-13 NMR spectroscopy, and electrochemistry. The structure of the minor isomer (2b) was elucidated by single-crystal X-ray structural analysis. C-13 and H-1 NMR measurements revealed the characteristic anisotropic interaction between the f electron on the Ce atom and nuclear spins of the carbon atoms of the cage and the protons of the Ad group, respectively.

• 出版日期2009-7-8