Synthesis And Properties Of Nitrogen-boron Coordination Borate

In this article,we synthesize 10 kinds of boric acid ester compounds containing nitrogen boron coordination bonds which are prepared from 3-Carboxamide boronic acid compounds and Schiff base,and study the properties of them.The 3-carboxamide boronic acid compounds used in this article are 3-(benzoyl amino)phenylboronic acid,3-(nicotinamide yl)phenyl boric acid,3-(isonicotinoyl amide)phenyl boric acid.The Schiff base used in this article are salicylaldehyde aminoethanol Schiff base,salicylaldehyde isopropanol amine Schiff base,o-hydroxyacetophenone reduction ethanolamine Schiff base,o-hydroxyacetophenone reduction isopropanol amine Schiff base.3-(Benzoyl amino)phenyl boronic acid and salicylaldehyde shrink ethanolamine Schiff base reflux with a 1:1 mixture of acetonitrile and dichloromethane solvent as the synthesis of 1a;3-(Nicotinamide base)phenyl boric acid and salicylaldehyde shrink ethanolamine Schiff base reflux using a 1:1 mixture of acetonitrile and dichloromethane solvent as the synthesis of 2a;3-(Isonicotinamide yl)phenyl boric acid and salicylaldehyde shrink the ethanolamine Schiff base was synthesized 3a by refluxing in a 1:1 mixture of acetonitrile and dichloromethane as the solvent;3-(Benzoyl amino)phenyl boronic acid and salicylaldehyde shrink isopropanol amine Schiff base reflux in a 1:1 mixture of acetonitrile and dichloromethane as the solvent synthesizing 1b;3-(Nicotinamide base)phenyl boric acid and salicylaldehyde shrink isopropanol amine Schiff base with a heated under refluxing conditions:a1:1 ratio of a mixture of acetonitrile and dichloromethane as the solvent,synthetize 2b;3-(Isonicotinoyl amide)phenyl boric acid and salicylaldehyde shrink isopropanol amine Schiff base mixed in a 1:1 ratio acetonitrile and dichloromethane solvent heating under refluxing conditions as the synthesis of 3b;3-(Benzoyl amino)phenyl boronic acid and o-hydroxyacetophenone reduction ethanolamine Schiff base reflux with a 1:1 ratio mixture of acetonitrile and dichloromethane solvent synthetizing 1c;3-(Nicotinamide yl)phenyl boric acid and o-hydroxyacetophenone reduction ethanolamine Schiff base reflux in a 1:1 mixture of acetonitrile and dichloromethane solvent as the synthesis of a 2c;3-(Isonicotinic amide)phenyl boric acid and o-hydroxyacetophenone ketal ethanolamine Schiff base reflux in a 1:1 mixture of acetonitrile and dichloromethane as the solvent synthesizing 3c;3-(Isonicotinamide yl)phenyl boronic acid and o-hydroxyphenyl b ketal isopropanol amine Schiff base reflux in a 1:1 ratio mixture of acetonitrile and dichloromethane as the solvent synthesizing 3d.The products which were synthesized from the experiments were characterized by IR spectroscopy,1H NMR,fluorescence spectroscopy,thermogravimetric analysis,were characterized by XRD,UV transmission,X-ray single crystal diffraction and any other analytical tools.1H NMR and elemental analysis show that the molar ratio of the composition of the substances in the product is 1:1.The infrared spectroscopy results show that the products contain nitrogen boron coordination bonds and boron-oxygen covalent bonds.These results confirmed that the products are all nitrogen boron coordination type boric acid ester.Fluorescence tests show that the products all have characteristic fluorescence,and the fluorescence intensity is different because of the different structure of the products,among them the fluorescence intensity compound lc,2c,3c of is relatively strong.