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作 者:徐梅芳[1]
出 处:《天津师范大学学报(自然科学版)》2016年第1期72-76,共5页Journal of Tianjin Normal University:Natural Science Edition
基 金:天津市应用基础与前沿技术研究计划(12JCYBJC13400)
摘 要:在B3LYP/6-311+G(d)计算水平上对(CH)n(CBO)6-n(n=0-6)分子的结构进行了全优化,在同一计算水平上采用规范无关原子轨道(GIAO)方法计算了此类化合物的核独立化学位移值(NICS),用以评价这些分子的芳香性.研究结果表明:(CH)n(CBO)6-n(n=0—6)具有芳香性,但芳香性比苯分子略弱,并且芳香性随着CH基团陆续被CBO基团取代而减弱.QTAIM分析进一步确认了这些分子的芳香性,并发现NICS(0)以及△NICS均同Hb存在良好的线性关系.此外,同(CH)a(BCO)6-n(n=0-6)化合物相比,(CH)n(CBO)6-n(n=0-6)分子不仅具有更高的热力学稳旬洼,而且还具有更强的芳香性.The structures of (CH)n(CBO)6-n (n is from 0 to 6) molecules were studied at B3LYP/6-311+G(d) level. The nucleus-independent chemical shifts ( NICS ) values calculated by the gauge-including atomic orbitals ( GIAO ) method were adopted to assess on the aromaticities of these molecules. The results showed that (CH)n(CBO )6-n (n is from 0 to 6) species are aromatic, which is slight weaker than benzene. MoreoVer, the aromaticities of (CH)n(CBO)6-n (n is from 0 to 6 ) is weak- ened along with the replace of CH by CBO. QTAIM analysis confirmed that (CH)n(CBO)6-n (n is from 0 to 6 ) species are aromatic, and good linear relationships were found between Hb and NICS(0) as well as NICS. In addition, (CH)n( BCO )6-n (n is from 0 to 6 )are more stable thermodynamically and more aromatic than (CH)n( CBO )6-n (n is from 0 to 6 ).
关 键 词:核独立化学位移(NICS) 芳香性 密度泛函理论 QTAIM 硼羰基化合物
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