Synthesis of a highly crystalline, covalently linked porous network
Porous networks are described linked by boronates. Also described are processes for producing the porous networks. The porous networks are formed by reacting a polyboronic acid with itself or with a polydiol, a polydiamine, or a polyamino alcohol. The resulting boronate linkage is covalently bonded. The characteristics and properties of the resulting porous material can be varied and altered by changing the reactants and by incorporating functional groups into the reactants. Of particular advantage, the porous materials can be formed at or near atmospheric pressure and at low temperature in the presence of one or more solvents.
1. A boronate linked porous network comprising:
a boronate comprising the reaction product of a polyboronic acid or an acyclic boronate ester thereof with a polydiol, a polyamino alcohol or a polydiamine to form a covalently bonded polymeric or oligomeric porous network, the boronate linked network having a pore size of less than about 200 angstroms, wherein the boronate is formed from the reaction product of a polydiol with a treboronic acid or an acrylic boronate ester thereof.
2. The boronate linked porous network as defined in claim 1 , wherein the boronate comprises the reaction product of a polyboronic acid or an acyclic boronate ester thereof with a polydiol to form a covalentiy bonded polymeric or oligomeric porous network.
3. The boronate linked porous network as defined in claim 2 , wherein the boronate ester has the following structure:
4. The boronate linked porous network as defined in claim 2 , wherein the boronate ester has a pore size of less than about 20 angstroms.
5. The boronate linked porous network as defined in claim 1 , wherein the polyboronic acid or acyclic boronate ester thereof comprises a triboronic acid or an acyclic boronate ester thereof.
6. The boronate linked porous network as defined in claim 5 , wherein the polydiol comprises a bis-diol.
7. The boronate linked porous network as defined in claim 5 , wherein the polydiol comprises 1,2,4,5-tetrahydroxybenzene.
8. The boronate linked porous network as defined in claim 5 , wherein the triboronic acid or acyclic boronate ester thereof comprises benzene-1,3,5-triboronic acid or an acyclic boronate ester thereof.
9. The boronate linked porous network as defined in claim 1 , wherein the boronate linked porous network comprises stacked sheets of the boronate ester, each sheet defining a pattern of pores.
10. A boronate linked porous network comprising:
a boronate comprising the reaction product of a polyboronic acid or an acyclic boronate ester thereof with a polydiol, a polyarnino alcohol or a polydiamine to form a covalently bonded polymeric or oligomeric porous network, the boronate linked network having a pore size of less than about 200 angstroms, wherein the polyboronic acid or acyclic boronate ester thereof comprises a triboronic acid or an acyclic boronate ester thereof.
11. The boronate linked porous network as defined in claim 10 , wherein the polydiol comprises a bis-diol.
12. The boronate linked porous network as defined in claim 10 , wherein the polydiol comprises 1,2,4,5-tetrahydroxybenzene.
13. The boronate linked porous network as defined in claim 10 , wherein the triboronic acid or acyclic boronate ester thereof comprises benzene-1,3,5-triboronic acid or an acyclic boronate ester thereof.
14. A boronate linked porous network comprising:
a boronate comprising the reaction product of a polyboronic acid or an acyclic boronate ester thereof with a polydiol, a polyamino alcohol or a polydiamine to form a covalently bonded polymeric or oligomeric porous network, the boronate linked network having a pore size of less than about 200 angstroms, wherein the boronate linked porous network comprises stacked sheets of the boronate ester, each sheet defining a pattern of pores.