Ito Yasuhiro, Okazaki Toshiya, Okubo Shingo, Akachi Masahiro, Ohno Yutaka, Mizutani Takashi, Nakamura Tetsuya, Kitaura Ryo, Sugai Toshiki, Shinohara Hisanori
Department of Chemistry and Institute for Advanced Research, Nagoya University, Nagoya 464-8602, Japan.
ACS Nano. 2007 Dec;1(5):456-62. doi: 10.1021/nn700235z.
Di-erbium and di-erbium-carbide endohedral metallofullerenes with a C(82) cage such as Er(2)@C(82) (isomers I, II, and III) and (Er(2)C(2))@C(82) (isomers I, II, and III) have been synthesized and chromatographically isolated (99%). The structures of Er(2)@C(82) (I, II, III) and (Er(2)C(2))@C(82) (I, II, III) metallofullerenes are characterized by comparison with the UV-vis-NIR absorption spectra of (Y(2)C(2))@C(82) (I, II, III), where molecular symmetries of the structures are determined to be C(s), C(2v) and C(3v), respectively. Furthermore, enhanced near-infrared photoluminescence (PL) at 1520 nm from Er(3+) ions in Er(2)@C(82) (I, III) and (Er(2)C(2))@C(82) (I, III) have been observed at room temperature. The PL intensities have been shown to depend on the symmetry of the C(82) cage. In particular, the PL intensity of (Er(2)C(2))@C(82) (III) has been the strongest among the isomers of Er(2)@C(82) and (Er(2)C(2))@C(82). Optical measurements indicate that the PL properties of Er(2)@C(82) (I, II, III) and (Er(2)C(2))@C(82) (I, II, III) correlate strongly with the absorbance at 1520 nm and the HOMO-LUMO energy gap of the C(82) cage.
已合成并通过色谱法分离（纯度99%）了具有C(82)笼的二铒和二碳化铒内嵌金属富勒烯，如Er(2)@C(82)（异构体I、II和III）以及(Er(2)C(2))@C(82)（异构体I、II和III）。通过与(Y(2)C(2))@C(82)（I、II、III）的紫外-可见-近红外吸收光谱进行比较，对Er(2)@C(82)（I、II、III）和(Er(2)C(2))@C(82)（I、II、III）金属富勒烯的结构进行了表征，其中结构的分子对称性分别确定为C(s)、C(2v)和C(3v)。此外，在室温下观察到了Er(2)@C(82)（I、III）和(Er(2)C(2))@C(82)（I、III）中Er(3+)离子在1520 nm处增强的近红外光致发光（PL）。已表明PL强度取决于C(82)笼的对称性。特别是，(Er(2)C(2))@C(82)（III）的PL强度在Er(2)@C(82)和(Er(2)C(2))@C(82)的异构体中最强。光学测量表明，Er(2)@C(82)（I、II、III）和(Er(2)C(2))@C(82)（I、II、III）的PL性质与1520 nm处的吸光度以及C(82)笼的HOMO-LUMO能隙密切相关。
