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Dimorphism and structural modulation in quinoxaline

机译:喹喔啉的二态性和结构调节

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摘要

The Z' = 1 and Z' = 5 structures of quinoxaline are compared. The nature of the intermolecular interactions in the Z' = 5 structure is studied by means of variable-temperature single-crystal X-ray diffraction. The C-H times times times N and capital pi times times times capital pi interactions in these structures are of a stabilizing nature. The high Z' structure has the better interactions, whereas the low Z' structure has the better stability. This trade-off is a recurrent theme in molecular crystals and is a manifestation of the distinction between thermodynamically and kinetically favoured crystal forms.
机译:比较了喹喔啉的Z'= 1和Z'= 5结构。通过可变温度单晶X射线衍射研究了Z'= 5结构中分子间相互作用的性质。在这些结构中,C-H乘以N和资本pi乘以资本pi的相互作用具有稳定的性质。高Z'结构具有更好的相互作用,而低Z'结构具有更好的稳定性。这种折衷是分子晶体中反复出现的主题,并且是热力学和动力学有利的晶体形式之间区别的体现。

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