Structure, tautomerism, and features of 1-(5-acetyl-2,4-dihydroxyphenyl)-3-(furan-2-yl)prop-2-en-1-one (FC) and 1,1′-(4,6-dihydroxybenzene-1,3-diyl)bis[3-(furan-2-yl)prop-2-en-1-one] (FDC)
作者:Michał Wera、Andriy G. Chalyi、Alexander D. Roshal、Beata Zadykowicz、Jerzy Błażejowski
DOI:10.1007/s11224-013-0378-y
日期:2014.6
Quantum chemistry studies of various tautomeric/rotameric forms of the furanyl analogues of acetyl dihydroxychalcone (FC) and dihydroxydichalcone (FDC) have shown that the thermodynamically most stable molecules are planar. In the crystalline solid phase, both molecules are more (FDC) or less (FC) non-planar. Two relatively strong intramolecular H-bonds, whose existence is evidenced by X-ray, computational, and spectral investigations, stabilize the planar geometry and influence the features of the lowest energy tautomers/rotamers of both compounds. Extending to the visible region, the electronic absorption of FC and FDC is accompanied by an intramolecular electron density shift, a property that could have analytical implications.
对乙酰基二羟基查尔酮(FC)和二羟基二查尔酮(FDC)的呋喃基类似物的各种同分异构体/反式的量子化学研究表明,热力学上最稳定的分子是平面的。在结晶固相中,这两种分子更多是平面的(FDC)或更少是非平面的(FC)。两个相对较强的分子内 H 键(X 射线、计算和光谱研究证明了它们的存在)稳定了平面几何,并影响了这两种化合物能量最低的同系物/旋转体的特征。延伸到可见光区域,FC 和 FDC 的电子吸收伴随着分子内电子密度偏移,这一特性可能具有分析意义。