Probing the presence and absence of metal-fullerene electron transfer reactions in helium nanodroplets by deflection measurements
Probing the presence and absence of metal-fullerene electron transfer reactions in helium nanodroplets by deflection measurements
复制标题
通过偏转测量探测氦纳米液滴中金属-富勒烯电子转移反应的存在与否
DOI：
10.1039/d2cp00751g
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发表时间：
2022
影响因子：
3.3
通讯作者：
Kresin, Vitaly V.
中科院分区：
文献类型：
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作者：
Niman, John W.;Kamerin, Benjamin S.;Villers, Thomas H.;Linker, Thomas M.;Nakano, Aiichiro;Kresin, Vitaly V.
金属-富勒烯化合物的特征在于显著的电子转移到富勒烯笼，产生电偶极矩。我们使用静电束偏转的方法来验证这种反应是否发生在嵌入式C60分子和碱金属（疏日性）或稀土（亲日性）原子之间的超流氦纳米液滴内。这两种情况导致了明显不同的结果：C60 Nan（n = 1-4）没有显示可辨别的偶极矩，而C60 Yb是强极性的。这表明富勒烯和小的碱金属团簇不能在氦基质中形成电荷转移键，尽管它们具有很强的货车德瓦尔斯吸引力。另一方面，C60 Yb偶极矩与离子络合物的预期值一致。
Metal-fullerene compounds are characterized by significant electron transfer to the fullerene cage, giving rise to an electric dipole moment. We use the method of electrostatic beam deflection to verify whether such reactions take place within superfluid helium nanodroplets between an embedded C60 molecule and either alkali (heliophobic) or rare-earth (heliophilic) atoms. The two cases lead to distinctly different outcomes: C60Nan (n = 1–4) display no discernable dipole moment, while C60Yb is strongly polar. This suggests that the fullerene and small alkali clusters fail to form a charge-transfer bond in the helium matrix despite their strong van der Waals attraction. The C60Yb dipole moment, on the other hand, is in agreement with the value expected for an ionic complex.