SnCNN：一个包含SnC三重键的分子  

SnCNN:A Molecule Containing Sn≡C Bond

作　　者：张文斌[1] 石国升[1] 丁益宏[1] 孙家锺[1] 

机构地区：[1]吉林大学理论化学研究所 理论化学计算国家重点实验室,长春130023

出　　处：《高等学校化学学报》2009年第7期1427-1430,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20103003,20573046,20773054);吉林省杰出青年基金(批准号:20050103);新世纪优秀人才支持计划资助

摘　　要：在CCSD(T)//B3LYP方法下,研究了四原子分子[SnCN2]的势能面,发现线性异构体SnCNN具有良好的动力学稳定性.几何分析与键分析表明,该异构体包含Sn≡C三重键,并可以用过渡金属络合物配合稳定来增加其稳定性.Triply bonded compounds RE = CR＇ that comprise higher-row elements are known to differ significantly in chemical bonding and reactivity from those of the traditional alkyne species. So they have formed the recent hot topic of the main-group chemistry researches. Unfortunately, these triply bonded species are usually unstable in kinetics towards conversion to doubly bonded Sn= C （R）R＇, making their experimental study rather difficult. To our knowledge, there was only one experiment that indirectly suggested the existence of Sn= C bonding through the de-nitrogen of ArSnC （N2 ）SiMe3 via spectroscopic technique. Therefore, search of kinetically stabilized Sn =-C compounds still remains a great challenge in main-group chemistry. For this sake, we report a detailed potential energy surface study on the four-atomic molecule [ SnCN2 ] at the CCSD （T）// B3LYP level. It was shown that the linear isomer SnCNN possesses good thermodynamic and kinetic stability. Structural and bonding analysis indicates that the isomer has a Sn = C triple bond. Further stabilization of the SnCNN skeleton could be realized via effective coordination by transition-metal carbonyls. Our study is expected to provide theoretical support for future experimental synthesis and characterization of the kinetically stabilized Sn = C compounds.

关 键 词：SnCNN 三重键 势能面 线性异构体 

分 类 号：O41[理学—理论物理]