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A theoretical study of hypothetical silicon analogs of simplest saccharide molecules
Computational and Theoretical Chemistry ( IF 3.0 ) Pub Date : 2019-10-09 , DOI: 10.1016/j.comptc.2019.112608
Denis Sh. Sabirov , Igor S. Shepelevich

The silicon-containing saccharide-like molecules have been studied with DFT computational methodology. A principal chemical possibility of the silicon analogs of glyceraldehyde, dihydroxyacetone, β-d-ribopyranose, β-d-deoxyribopyranose, and α-d-glucopyranose) has been shown. The IR spectra of such sila-sugars should contain the bands in the region 2000–2200 cm−1 corresponding to the stretching modes of SiH bonds. Physicochemical and chemical properties of sila-sugars substantially differ from those of their carbon prototypes. According to the performed calculations, it is especially true for intermolecular interactions, and possibility of the existence of saccharides in linear and cyclic forms. High values of the mean polarizabilities of silicon compounds indicate stronger intermolecular interactions between the silicon compounds. The existence of linear forms of sila-sugars is unlikely. For sila-ribose Si5H10O5, the calculated heat effect of the conversion of the cyclic form to the linear one is highly endothermic.



中文翻译:

最简单糖分子假想硅类似物的理论研究

已经用DFT计算方法研究了含硅糖样分子。硅的主要化学可能性类似物甘油醛,二羟基丙酮,β-的d -ribopyranose,β- d -deoxyribopyranose,和α- d -glucopyranose)已被证明。此类硅糖的红外光谱应在2000–2200 cm -1范围内包含与Si的拉伸模式相对应的谱带H键。硅糖的理化特性与碳原型的理化特性大不相同。根据进行的计算,对于分子间相互作用以及线性和环状形式的糖类存在的可能性尤其如此。硅化合物的平均极化率较高,表明硅化合物之间的分子间相互作用较强。硅糖的线性形式的存在是不可能的。对于硅核糖Si 5 H 10 O 5,计算出的从环状形式转化为线性形式的热效应是高度吸热的。

更新日期:2019-10-09
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