Search

Hierarchical β -NaGdF 4 nanobundles are synthesized through a facile hydrothermal method with the use of sodium acetate (NaAc). A NaGdF 4 -GdF 3 -NaGdF 4 products transformation with the increase of fluoride source (NaF) is observed. Results show that NaAc is the key factor in the synthesis of β -NaGdF 4 at a low NaF/Gd 3+ ratio and NaAc also plays a significant role in the formation of the hierarchical morphology. Meanwhile, the size of nanobundles increases with the increased ratio of NaF/NaAc. With altering the ratio of reactants, dumbbell-like, urchin-like or rod-like β -NaGdF 4 nanobundles are obtained. The photoluminescent properties of β -NaGdF 4 : 2%Eu 3+ are also measured.

A recently synthesized new molecule C131 (C60 C C70) is studied using the MNDO, AM1, PM3 and B3LYP methods. [6.6]-8 isomer is the most stable structure of C131. To create C60 C C70, the C70 cage thermodynamically prefers to open bond at the equatorial region. The strain analysis performed for the pristine C70 (D5h) and C70 in C131 revealed that the cycloaddition reaction occurring with the equatorial C–C bond can lead to a larger strain release than occurring with the polar C–C bond of C70. The results provide new insights to understand the observations of C60 C C70 as well as the previously reported C70 C C70 and C70O.