Anisotropic magnetic behavior of anionic Ce@C82 carbene adducts.
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, (1)H and (13)C NMR spectroscopy, and electrochemistry. The structure of the minor isomer (2b) was elucidated by single-crystal X-ray structural analysis. (13)C and (1)H 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.
Takano
Yuta
Y
Center for Tsukuba Advanced Research Alliance, University of Tsukuba, Tsukuba, Ibaraki 305-8577, Japan.
Aoyagi
Motoki
M
Yamada
Michio
M
Nikawa
Hidefumi
H
Slanina
Zdenek
Z
Mizorogi
Naomi
N
Ishitsuka
Midori O
MO
Tsuchiya
Takahiro
T
Maeda
Yutaka
Y
Akasaka
Takeshi
T
Kato
Tatsuhisa
T
Nagase
Shigeru
S