The Supramolecular Chirality Study Of Bilateral Multi-Hydrazide Zinc Complex

Chiral supramolecular assembly has attracted a lot of attention as a hot topic in recent years because of the vairitey of structures,phases,properties and the adjustability of conformation.The conventional method of building chiral supramolecular is by using chiral molecules as templates or building blocks.But the method has some shortness,such as the expensive charge of chiral reagent,the limitation which caused by the high selectivity.Some physical asymmetric fields have been highly focused due to the readily regulation and require no chiral molecules.There are only a few literatures reported that the macroscopic chirality of vortex can be transferred to supramolecular level chirality(mainly organic supramolecular assemblies).The configuration of supramolecular assemblies can be adjusted by the vortex.In this paper,the vortex induced dynamic supramolecular chirality has been reported for the first time in the coordinate polymeric gel which is completely composed of achiral components.And the mechanism of chiral transfer from macroscopic vortex to supramolecular assembly or single molecular is preliminarily discussed.It is hopeful that this work would enrich the study of vortex induced supramolecular chirality,and provid the abundant materials for the chirality origin research.The work are as follows.1.Four bilateral multi-hydrazide compounds:o-OHPhAb,o-OHPhSb,PhAb,PhSb were synthesized and characterized.Then the compounds were used to prepare four coordinate polymeric gels(sols)by the envolvement of zinc acetate.The preparation conditions,gelatinization of gels(sols)were also discussed.2.The vortex induced supramolecular chirality of o-OHPhAb-Zn was studied in situ by circular dichroism(CD)spectrometer.The induced CD can be controlled by the stirring direction and modulated by stirring speed.The UV-Vis absorption spectroscopy,IR spectroscopy,XRD spectroscopy and microscopy(SEM,TEM,AFM)were used to investigated the electronic structure,bonding characters and the microstructure of o-OHPhAb-Zn.The mechanism of vortex induced supramolecular chirality was discussed.By the help of dye molecules adsorption experiments,the interaction between o-OHPhAb-Zn and positively charged dye molecules was discussed.The resuilts suggested that the o-OHPhAb-Zn was negatively charged which exhibited significant adsorption for the positive charged dye such as methyl violet,rhodamine B and methylene blue.Further study showed that the induced CD can be quenched by methyl violet and rhodamine B molecule and the induced CD can be transferred to the methylene blue molecule.Such phenomenas have been discussed based on the structure of o-OHPhAb-Zn.3.The vortex stirring induced supramolecular chirality of o-OHPhSb-Zn,PhAb-Zn and PhSb-Zn were also studied in situ by circular dichroism(CD)spectrometer,showing similar induced CD effect.The electronic structure,bonding characters and the microstructure of three coordinate polymeric systems were characterized by UV-Vis absorption spectroscopy,IR spectroscopy,XRD spectroscopy and microscopy(SEM,TEM,AFM).The comparision of four coordination polymers in the gelatiniz,ation,in situ stirred CD spectroscopy and microstructure were summarized and discussed.The structural influence of ligand molecules on the microstructure of coordinate polymeric system and the responsiveness to vortex of coordinate polymeric system was discussed.