首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >On stability, chirality measures, and theoretical VCD spectra of the chiral C _(58)X _2 fullerenes (X = N, B)
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On stability, chirality measures, and theoretical VCD spectra of the chiral C _(58)X _2 fullerenes (X = N, B)

机译:关于手性C _(58)X _2富勒烯(X = N,B)的稳定性,手性测度和理论VCD谱

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摘要

The stability of all 23 C _(58)N _2 and C _(58)B _2 heterofullerenes in the singlet and triplet states was determined at the B3LYP/6-31G * level. In equilibrium mixture the achiral (1,4) C _(58)N _2 isomer would be populated in ca. 95.8%, the chiral (1,16) one in ca. 3.3%, and the achiral (1,4) C _(58)B _2 in 100%, whereas all triplet state isomers are less stable. Fourteen out of 23 C _(58)X _2 are chiral. Four different chirality measures were calculated by our own CHIMEA program: pure geometrical, labeled, mass, and charge. Intercorrelations between the measures for all chiral compounds indicate that the pure geometrical chirality measure is unstable and should not be used in QSAR predictions of the other molecular properties, while the labeled and mass-weighted ones are promising QSAR descriptors. For each chiral C _(58)N _2 molecule, some very strong VCD bands, of intensity comparable with that in the IR spectra, can serve in identification and characterization of the isomers.
机译:在B3LYP / 6-31G *水平确定了所有23 C _(58)N _2和C _(58)B _2杂富勒烯在单重态和三重态下的稳定性。在平衡混合物中,非手性(1,4)C _(58)N _2异构体将在大约1中被填充。 95.8%的手性(1,16)约占3.3%和非手性(1,4)C _(58)B _2为100%,而所有三重态异构体的稳定性均较差。 23 C _(58)X _2中有14个是手性的。我们自己的CHIMEA程序计算了四种不同的手性度量:纯几何,标记,质量和电荷。所有手性化合物的度量之间的相互关系表明,纯几何手性度量是不稳定的,不应将其用于其他分子特性的QSAR预测中,而标记的和质量加权的则是有希望的QSAR描述符。对于每个手性C _(58)N _2分子,一些非常强的VCD带(强度与IR光谱中的强度相当)可以用于异构体的鉴定和表征。

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