A class of framework molecules based on cyclopolymer folding and assembly and its preparation method

Abstract

The invention discloses a class of framework molecules based on ring polymer folding and assembly and a preparation method thereof. The chemical name of the framework molecule is cyclic polyester, including cyclic di-polyester or 1-Ar, cyclo-tri-polyester or 2-Ar, cyclo-tetra-polyester or 3-Ar, cyclo-penta-polyester or 4-Ar, cyclohexa-polyester or 4-Ar, Polyester is 5-Ar, wherein Ar represents benzene-1,4-diyl is Ph, biphenyl-4,4'-diyl is BP, 2,2-bipyridine-5,5'-diyl is BPy or pyrene-2,7-diyl is one of Pr, and its structural formula is as follows; its preparation method includes carboxylic acylchlorination by thionyl chloride reflux method, ester condensation into ring by solvent-free method and utilization of gradient Cyclic polyesters were separated by elution. The present invention utilizes the feature of intermolecular assembly to form larger nanometer cavities to develop four series of cyclopolyester supramolecular main compounds. The cyclic polyester has few synthesis steps, mild reaction conditions, and low cost of separation and purification.

Description

technical field [0001] The invention relates to supramolecular chemistry, in particular to a class of framework molecules based on ring polymer folding and assembly and a preparation method thereof. Background technique [0002] Supramolecular chemistry is an important branch of chemistry, which mainly realizes the assembly, recognition and reaction of molecules by means of non-covalent interactions between molecules. Compared with the strong interaction of covalent bonds in traditional chemistry, the research objects of supramolecular chemistry are weaker and recoverable intermolecular interactions, such as hydrogen bonds, metal coordination, π-π stacking, hydrophobic / philic Water effects, van der Waals forces, superposition, etc. In order to make full use of molecular self-assembly, folding, recognition, host-guest inclusion and other functions, and make these weak interactions exert unexpected effects, the host molecules participating in supramolecular interactions are r...

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Problems solved by technology

[0003] Nevertheless, the disadvantages of the above supramolecular systems are also obvious

From a structural point of view, in addition to natural enzymes, the above-mentioned host molecules, especially the synthetic host molecules, have high molecular rigidity and small cavity size, which greatly restricts the diversity of molecular assembly and recognition. ; while metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) are two types of materials, the molecular cavity is too deep, the molecular geometry is single, the recognition ability of the guest molecule is poor, and the exchange of molecules inside and outside the pores is difficult.

From the perspective of synthesis, although cyclodextrin has a wide range of sources, the chemical modification is very complicated; the synthesis of main molecules such as calixarene and MOFs and COFs is also difficult, such as many synthesis steps, high reaction temperature, high cost of separation and purification, etc.

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