Preparation method of organic chiral eutectic based on achiral small molecules as donor and receptor

Abstract

The invention relates to a preparation method of an organic chiral eutectic based on achiral micromolecules as a donor and an acceptor, which comprises the following steps: dissolving Bper and FTCNQ in acetonitrile or chloroform according to a molar ratio of 1: 1, filtering a hot saturated solution, sealing for 5 hours, opening a cover, and volatilizing in a fuming cupboard at 26 DEG C, so that a chiral crystal Bper-FTCNQ is separated out in 3-4 days. The donor and acceptor materials are achiral materials, and the solvent does not contain chiral factors, so that the original structure and property cannot be changed due to the introduction of the chiral factors; the whole growth process has no requirements on the chiral environment, and the operation is simple; according to the chiral crystal, no chiral inducer is introduced, so that the interaction between donor molecules and acceptor molecules is strong, and the thermal stability is good. The magnetization intensity of the prepared right-hand chiral Bper-FTCNQ crystal is obviously higher than that of the left-hand chiral crystal, and the two chiral crystals have different ferromagnetic phase transition temperatures, and are suitable carriers for researching the chiral structure and spin coupling of organic materials.

Description

technical field [0001] The invention belongs to the technical field of crystal growth and preparation, and relates to a method for preparing an organic chiral eutectic based on an achiral small molecule as a donor acceptor. In addition, the crystal is a rare organic chiral ferrimagnet. Background technique [0002] Chirality is an important property of matter that exists widely in nature. It usually means that an object cannot coincide with its own mirror image after symmetry operations such as translation and rotation. Like our hands, the left hand cannot coincide with the right hand that is a mirror image of each other. Such objects are called chiral bodies, which have either left-handedness or right-handedness. A chiral body and its mirror image are symmetrical enantiomers. From natural small molecular amino acids and sugars to biomacromolecular proteins, RNA, and DNA, to chiral crystals in the macroscopic world, hurricanes, and even spiral nebulae in the vast universe a...

AI Technical Summary

Problems solved by technology

The preparation method of introducing an asymmetric factor is easy to change the original structure and properties, which is not conducive to obtaining chiral materials with high purity and strong thermal stability

At present, in chiral materials, some chiral metal-organic compounds, chiral polymers, and chiral charge-transfer complexes may exhibit ferromagnetism, and some inorganic materials and organic-inorganic hybrid complexes may exhibit ferrimagnetism. However, there are rare reports of pure organic chiral ferrimagnetic eutectics, and the differences in the ferrimagnetism of left-handed and right-handed organic eutectics have not yet been reported.

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