Optically Pure Pyridine Bisoxazoline Ligands For Molecular Magnetic Materials

In the past few decades,spin-cross materials have achieved many potential application achievements in the fields of information storage.In this paper,molecular magnetic materials were constructed based on optically pure pyridine bisoxazoline ligand(PyBox).The specific research contents are as follows:First,optically pure PyBox-Ph was used as ligand,ClO4-and BPh4-were used as counter ions.By adjusting the ratio of R and S ligands,an optical pure and racemic system containing nitromethane and acetonitrile co-crystallization solvent was synthesized.Fe[(PyBox)2]2+complex.Through a series of analysis,we found that due to the difference in chirality between optically pure and racemic systems,in a Fe(II)ion center,the benzene rings on the two ligands are stacked in a large manner in space,and the counter ions and the solvent molecules are pressed to different degrees in the lattice of Fe[(PyBox)2]2+ complexes,and the spatial structure of the complexes is further changed,resulting in a great change in their SCO properties,and the racemic complexes are displayed.We found that chirality can be used as a new means of regulating SCO behavior,and SCO behavior is often accompanied by a phase change,and this has been proved by testing in our work.Second,we have further expanded the Fe[(PyBox)2]2+complex system:by introducing-Me,-Bn as a new ligand substituent,introducing BF4 and PF6 as new counter ions.More comprehensive and powerful,the effects of ligand substituents and counterions on the SCO behavior of their corresponding desolvation complexes were analyzed.Then,we designed and synthesized the meso-PyBox ligand,which is proposed to synthesize meso-Fe[(PyUox)2]u+ complex by screening appropriate substituents,counter ions,and coordination with the introduction of specific co-crystallized solvent.By combining the three different systems of optical purity,meso-and racemic,we can deduce the effect of spatial variation caused by chiral differences on the transformation of SCO properties.In the longitudinal comparison,we can also explore solvents,counterions,etc.The influence of factors on the SCO properties of the PyBox complex of the same system,thus constructing a complete chiral Fe[(PyBox)2]2+,complex system.