A), nonplanarity of the anthracenone moiety (>20 degrees ), and preferred gauche conformation. However, when the gauche preference is weak, environmental effects such as solvation and packing forces can reverse it. As the degree of nonplanarity of the anthracenone moiety is consistently larger in the anti conformation than in the gauche and the ease of achieving nonplanarity is determined by flexibility
联
蒽醌(1,2b-5b)的五个X射线晶体学结构显示存在长的中心C(sp3)-C(sp3)键(>或= 1.60 A),且主要为gauche构象。进行了DFT计算,以研究
联苯乙酰和相关模型分子的结构特征[更正]。我们的B3LYP / 6-31G气相计算结果表明,空间效应在导致较长的CC sigma键长(> 1.60 A),
蒽酮部分的非平面性(> 20度)和优选的gauche构象中起作用。但是,当薄纱的偏爱性很弱时,诸如溶剂化和堆积力之类的环境影响会逆转它。