Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 24, Issue 17, Pages 10378-10383Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2cp00751g
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Funding
- U.S. National Science Foundation, Division of Chemistry [CHE-1664601, CHE-2153255]
- National Science Foundation [OAC-2118061]
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Metal-fullerene compounds exhibit different behaviors when reacting with alkali or rare-earth atoms within superfluid helium nanodroplets, with alkali clusters failing to form charge-transfer bonds while rare-earth clusters show strong polarization.
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 C-60 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.
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