Exploring Reactivity and Regioselectivity of Dimerization of Paramagnetic Endohedral Metallofullerenes

DOI码：10.1021/acs.inorgchem.0c01448

所属单位：扬州大学

教研室：物理化学

发表刊物：Inorganic Chemistry

摘要：Due to their radical character, paramagnetic endohedral metallofullerenes (EMFs) are prone to dimerize. The dimerization exhibits high selectivity, i.e., only one or a few dimer structures, among a great number of possible choices of carbon cage forms and reaction sites, were observed in experiments. To unravel the determining factors of dimerization selectivity, we conducted a systematic computational study of the dimerization of a series of experimentally synthesized paramagnetic EMFs, representatively including M@C82 (M = Y, Sc, La), La@C72 with adjacent pentagons, and Y2@C80 in triplet state. By exploring many possible monomer structures and all possible dimerization sites for each monomer, we can explain the unique dimer structure of Y@C82 observed in the experiment. Thereby, we suggest two energetic criteria to determine whether a dimer structure can be formed under certain synthetic conditions: the monomer precursor should be sufficiently stable and the dimerization process should be sufficiently exergonic. Furthermore, we show that commonly used reactivity descriptors, based on different physical arguments such as spin density, geometric characteristics, aromaticity, and bond orders, all have poor or no correlation with the dimerization regioselectivity of EMFs. Conversely, we propose a simple hydride model able to quantitatively predict the relative dimer energies, which would serve as reliable and general guidance for the dimerization of EMFs and their derivatives.

第一作者：王丽红

论文类型：SCI

通讯作者：汪洋

学科门类：理学

一级学科：化学

文献类型：SCI

卷号：59

期号：15

页面范围：10962–10975

是否译文：否

发表时间：2020-07-21

收录刊物：SCI