金屬富勒烯Sc3N@C7在晶體中旋轉的相變過程被成功觀察
作者:
小柯機器人發布時間:2021/1/7 13:47:39
金屬富勒烯Sc3N@C7在晶體中旋轉的相變過程被成功觀察到,這一成果由德國萊布尼茲固態和材料研究所Fupin Liu、Alexey A. Popov、Stanislav M. Avdoshenko團隊合作取得。 相關論文於2020年12月31日發表於國際頂尖學術期刊《美國化學會志》。
科研人員通過單晶X射線衍射確定了Sc3N @ C2v(7854)-C70的分子結構。可變溫度X射線衍射分析揭示了富勒烯籠在兩個方向之間的溫度驅動跳躍狀旋轉所形成的相變細節。而在較低溫度的P21/c相中,富勒烯主要佔據一個取向,而在較高溫度的C2/m相中,富勒烯佔據兩個取向。
這項工作提供了一個金屬富勒烯晶體中定義明確的有序-無序轉變的罕見例子,因而對無序阻礙金屬富勒烯結晶學的問題提供了重要見解。
附:英文原文
Title: Caught in Phase Transition: Snapshot of the Metallofullerene Sc3N@C70 Rotation in the Crystal
Author: Yajuan Hao, Yaofeng Wang, Vasilii Dubrovin, Stanislav M. Avdoshenko, Alexey A. Popov, Fupin Liu
Issue&Volume: December 31, 2020
Abstract: The molecular structure of Sc3N@C2v(7854)-C70 was determined by single-crystal X-ray diffraction. Variable-temperature X-ray diffraction analysis unraveled the details of the phase transition caused by the temperature-driven jumplike rotation of the fullerene cage between two orientations. Whereas in the lower-temperature P21/c phase the fullerene predominantly occupies one orientation, two orientations become equally occupied in the higher-temperature C2/m phase. This work provides a rare example of the well-defined order–disorder transition in metallofullerene crystals and thus gives important insight into the problem of disorder impeding metallofullerene crystallography.
DOI: 10.1021/jacs.0c10758
Source: https://pubs.acs.org/doi/10.1021/jacs.0c10758