Storing molecule within porous materials with a surface molecular barrier layer
In some aspects, the present disclosure provides compositions comprising a nanoporous material such as a metal organic framework and an amine containing compound. In some aspects, these compositions may be used to improve the affinity of a guest molecule to the nanoporous material relative a nanoporous material which had not been treated with the amine containing compound.
1. A composition comprising:
(A) nanoporous material;
(B) ethylenediamine; and
(C) a guest molecule;
wherein the guest molecule is contained within the nanoporous material and the ethylenediamine penetrates not greater than 1 nm toward the interior of the nanoporous material.
2. The composition of claim 1 , wherein the ethylenediamine is deposited such that the amine group of the ethylenediamine is bound to a metal atom of the nanoporous material.
3. The composition of claim 1 , wherein the nanoporous material is a metal organic framework.
4. The composition of claim 3 , wherein metal organic framework comprises a pore diameter of less than 25 Å.
5. The composition of claim 3 , wherein the metal organic framework is further defined by the formula: ML, wherein:
M is a metal ion; and
L is a ligand;
the metal organic framework is further defined by the formula M 2 L, wherein:
M is a metal ion; and
L is a ligand of the formula:
the metal organic framework is further defined by the formula: M 2 L 3 wherein:
M is a trivalent metal ion; and
L is a divalent ligand; or
the metal organic framework is further defined by the formula: M 3 L 2 wherein:
M is a metal ion; and
L is a trivalent ligand.
6. The composition of claim 1 , wherein the guest molecule is CO, CO 2 , SO 2 , NO, C 2 H 2 or C 2 H 4 .
7. A method of preparing a composition of claim 1 comprising reacting a nanoporous material with a gaseous mixture comprising ethylenediamine.
8. The method of claim 7 , further comprising a guest molecule.
9. The method of claim 8 , wherein the guest molecule is a gas.
10. The method of claim 9 , wherein the guest molecule is CO, CO 2 , SO 2 , NO, C 2 H 2 or C 2 H 4 .
11. The composition of claim 1 , wherein the ethylenediamine is disposed as a monolayer on the exterior surface of the nanoporous material.
12. The composition of claim 1 , wherein the ethylenediamine is not present within internal pores of the nanoporous material.
13. The composition of claim 1 , wherein an amine of the ethylenediamine is deposited at a surface opening of the pores of the nanoporous material.