Synthesis of MOFs
The present invention relates to the synthesis of a variety of metal organic frameworks (MOFs) using low temperature and solvents which are considered to be not particularly harmful to the environment. There is also provided novel MOFs which may be made by the desired processes.
1. A method of synthesizing a metal organic framework (MOF) of the form of M x (2,5-dihyroxyterephthalate (DHTP)) y (OH) v (H 2 O) w , wherein;
M is a metal or metals; and
x is in a range from 1-10, y is in a range from 0.1-3, v is in a range from 0-2 and w is in a range from 0-14;
the method comprising the step of providing a salt of DHTP acid or an aqueous solution thereof; and
mixing the DHTP acid or an aqueous solution thereof with a water/alcohol solution in a range of 3-100 water/alcohol, of a metal salt/source, wherein the metal salt/source to the salt of DHTP acid is in the range 1-15, at a temperature between 0° C. and 100° C. at atmospheric pressure for 30 minutes to 6 hours, to thereby obtain said MOF.
2. The method according to claim 1 , comprising providing a water soluble salt of DHTP.
3. The method according to claim 1 , wherein M is one or more metals selected from the group consisting of Zn, Ni, Mn, Mg, Ag, Cu, and Na.
4. The method according to claim 1 , wherein the metal organic framework is in the form of M 2 M′ z (DHTP) (H 2 O) 2 .qH 2 O,
wherein q is in a range from 0-12, z is in a range from 0-8; and
M is one or more metals selected from the group consisting of Zn, Ni, Mn, Mg, Ag, Cu, and Na,
and M′ is a further metal selected from the group consisting of Zn, Ni, Mn, Mg, Ag, Cu, and Na.
5. The method according to claim 1 , wherein the salt of DHTP or an aqueous solution thereof in the providing step is prepared by combining a conjugate acid or salt of DHTP and a base.
6. The method according to claim 5 , wherein DHTP or an aqueous solution thereof in the providing step is prepared by adding a solution or suspension of the conjugate acid or salt of DHTP to a sodium hydroxide solution, to thereby provide an aqueous solution of a salt of DHTP.
7. The method according to claim 1 , comprising providing an aqueous solution of a salt of DHTP, and vigorously mixing the aqueous solution with the water/alcohol solution of the metal salt.
8. The method according to claim 1 , comprising providing a water soluble salt of DHTP, and vigorously mixing the water soluble salt of DHTP, with the water-alcohol solution of the metal salt, and optionally a co-solvent directly in a single vessel.
9. The method according to claim 1 , wherein the metal to DHTP linker molar ratio M/L is in a range from 1-5.
10. The method according to claim 1 , wherein the temperature is within a range selected from the group consisting of between 10° C. and 80° C.; between 15° C. and 65° C.; and between 20° C. and 55° C.
11. The method according to claim 1 wherein the metal salt/source ratio to the salt of DHTP acid is in the range 2-4.
12. The method according to claim 1 wherein the alcohol is ethanol or isopropanol.
13. The method according to claim 1 , which excludes the use of THF, DMF, DMSO, or other non-alcoholic solvents.
14. The method according to claim 4 , wherein the MOF is of the form Zn x Ni y Na z (DHTP)(H 2 O) 2 .qH 2 O, where the values of x+y+z=2 or x+y=2, z=0-8 and q=0-12.