Ligand-directed reticular synthesis of metal-organic frameworks having edge-transitive ALB network topologies
A series of isoreticular metal-organic frameworks composed of metal nodes connected by rigid trigonal prismatic organic linkers and having a 6,12-coordinatled alb network topology are provided. Also provided are methods of synthesizing the metal-organic frameworks and methods of using the metal-organic frameworks to catalyze the hydrolysis of organic molecules, such as nerve agents, having hydrolysable bonds.
1. A metal-organic framework comprising M 6 nodes connected by organic linkers, where M is a metal and the organic linkers comprise extended triptycene groups, the metal-organic framework having a 6,12-coordinated alb (aluminum diboride, hexagonal-prism and trigonal prism) network topology.
2. The metal-organic framework of claim 1 , wherein M is zirconium.
3. The metal-organic framework of claim 1 , wherein the metal-organic framework is a NU-1600 metal-organic framework, a NU-1601 metal-organic framework, or a NU-1602 metal-organic framework.
4. The metal-organic framework of claim 1 , wherein M is hafnium, chromium, or thorium and the metal-organic framework is isostructural with a NU-1600 metal-organic framework, a NU-1601 metal-organic framework, or a NU-1602 metal-organic framework.
5. The metal-organic framework of claim 1 , wherein the organic linkers comprise a central triptycene unit connected to peripheral groups comprising phenyl groups, diphenyl groups, or tolane groups.
6. A method of making a metal-organic framework comprising M 6 nodes connected by organic linkers, where M is a metal and the organic linkers comprise extended triptycene groups, the metal-organic framework having a 6,12-coordinated alb (aluminum diboride, hexagonal-prism and trigonal prism) network topology, the method comprising:
dissolving a metal salt, at least one peripherally extended triptycene ligand, and an acid in a solvent to form a solution; and
heating the solution to induce crystallization of the metal-organic framework from the metal salt and the peripherally extended triptycene ligand.
7. The method of claim 6 , wherein the metal salt is a zirconium salt and the metal-organic framework is a zirconium metal-organic framework.
8. The method of claim 6 , where in the metal salt is a hafnium salt and the metal-organic framework is a hafnium metal-organic framework.
9. The method of claim 6 , wherein the metal salt is a cerium salt and the metal-organic framework is a cerium metal-organic framework.
10. The method of claim 6 , wherein the metal salt is a thorium salt and the metal-organic framework is a thorium metal-organic framework.
11. A method of hydrolyzing a molecule, the method comprising exposing the molecule to a metal-organic framework having a 6,12-coordinated alb (aluminum diboride, hexagonal-prism and trigonal prism) network topology in the presence of water, the metal-organic framework comprising M 6 nodes connected by organic linkers, where M is a metal, the M 6 nodes have Lewis acidic sites, and the organic linkers comprise extended triptycene groups, wherein the metal-organic framework catalyzes the hydrolysis of a bond in the molecule.
12. The method of claim 11 , wherein the hydrolysis of the bond takes place in the presence of a base.
13. The method of claim 12 , wherein the molecule is an organophosphonate.
14. The method of claim 12 , wherein M is zirconium.
15. The method of claim 12 , wherein the metal-organic framework is a NU-1600 metal-organic framework, a NU-1601 metal-organic framework, or a NU-1602 metal-organic framework.
16. The method of claim 12 , wherein M is hafnium, chromium, or thorium and the metal-organic framework is isostructural with a NU-1600 metal-organic framework, a NU-1601 metal-organic framework, or a NU-1602 metal-organic framework.
17. The method of claim 12 , wherein the organic linkers comprise a central triptycene unit connected to peripheral groups comprising phenyl groups, diphenyl groups, or tolane groups.