Method of preparing boron-nitrogen compounds
View Patent ↗A method of preparing a boron-nitrogen compound includes combining an ammonium salt and an ionic compound in the absence of solvent to form a mixture. The ionic compound includes a cation and an anion. The anion is represented by the general formula B(R 1 ) 4 − , wherein each R 1 is independently selected from the group of hydrogen, alkyl groups, aryl groups, and combinations thereof. The method also includes agitating the mixture in the absence of solvent to form a reaction product, and separating the boron-nitrogen compound from the reaction product.
1. A method of preparing a boron-nitrogen compound, the method comprising the steps of:
combining;
an ammonium salt; and
an ionic compound including;
a cation; and
an anion represented by the general formula B(R 1 ) 4 − ;
in the absence of solvent to form a mixture;
wherein each R 1 is independently selected from the group of hydrogen, alkyl groups, aryl groups, and combinations thereof;
agitating the mixture in the absence of solvent to form a reaction product; and
separating the boron-nitrogen compound from the reaction product;
wherein the boron-nitrogen compound is represented by the general formula N(R 2 ) 3 B(R 3 ) 3 ;
wherein each R 2 and R 3 is independently selected from the group of hydrogen, alkyl groups, aryl groups, and combinations thereof.
2. The method of claim 1 , wherein the boron-nitrogen compound is ammonia borane.
3. The method of claim 1 , wherein agitating is further defined as ball milling.
4. The method of claim 3 , wherein said ball milling is further defined as grinding the mixture at an acceleration of from greater than or equal to approximately 1 g for from greater than or equal to approximately 0.1 hour.
5. The method of claim 1 , wherein agitating is further defined as attritor milling.
6. The method of claim 1 , wherein agitating is further defined as stirring.
7. The method of claim 1 , wherein agitating is further defined as shaker milling.
8. The method of claim 1 , wherein the ammonium salt includes a cation selected from the group of ammonium, alkyl ammonium, aryl ammonium, and combinations thereof, and an anion including an element selected from the group of Group 15-17 elements of the periodic table.
9. The method of claim 1 , wherein the ammonium salt is ammonium chloride.
10. The method of claim 1 , wherein the ionic compound is a metal borohydride.
11. The method of claim 10 , wherein the metal borohydride is selected from the group of monovalent metal borohydrides, alkyl borohydrides, aryl borohydride, and combinations thereof.
12. The method of claim 11 , wherein the metal borohydride is sodium borohydride.
13. The method of claim 1 , wherein the ammonium salt and the ionic compound are combined in a 1:1 molar ratio.
14. The method of claim 1 , wherein separating is further defined as recrystallizing the boron-nitrogen compound in a solvent.
15. The method of claim 14 , wherein the solvent is organic.
16. The method of claim 14 , wherein the solvent is tetrahydrofuran.
17. The method of claim 1 , wherein separating is further defined as dissolving the reaction product in a solvent.
18. A method of preparing a boron-nitrogen compound, the method comprising the steps of:
combining;
an ammonium salt; and
an ionic compound including;
a cation; and
an anion represented by the general formula B(R 1 ) 4 − ;
in the absence of solvent to form a mixture;
wherein each R 1 is independently selected from the group of hydrogen, alkyl groups, aryl groups, and combinations thereof;
agitating the mixture in the absence of solvent to form a reaction product; and
separating the boron-nitrogen compound from the reaction product;
wherein the boron-nitrogen compound is represented by the general formula N(R 4 ) 4 B(R 5 ) 4 ;
wherein each R 4 and each R 5 is independently selected from the group of hydrogen, alkyl groups, aryl groups, and combinations thereof.
19. The method of claim 18 , wherein agitating is further defined as ball milling.
20. A method of preparing a boron-nitrogen compound, the method comprising the steps of:
agitating an ammonium salt in the absence of solvent;
agitating an ionic compound including;
a cation; and
an anion represented by the general formula B(R 1 ) 4 − ;
in the absence of solvent;
wherein each R 1 is independently selected from the group of hydrogen, alkyl groups, aryl groups, and combinations thereof;
combining the agitated ammonium salt and the agitated ionic compound in the absence of solvent to form a mixture;
agitating the mixture in the absence of solvent to form a reaction product; and
separating the boron-nitrogen compound from the reaction product.