Patent ID: 8420837

Claim:
A method of preparing nanoparticle Fe 0 6 -crown ether complex comprising the steps of: preparing dialkylamine or ethylenediamine solutions of iron (II) complexes with oligomer crown ethers, containing two nitrogen atoms in macrocyclic ring at a first temperature; adding a predetermined amount of a solution of sodium tetrahydroboron in ethylene diamine and mixing the result for a first period of time; heating the resulting mixture to a second temperature and then boiling the mixture for a second period of time; filtering the resulting mixture under a nitrogen atmosphere; adding ethanol to the resulting mixture to reduce excess NaBH4, and continuing to boil the mixture until at least half of the ethylene diamine has been removed; and cooling the mixture to below 5° C. to precipitate a nanoparticle Fe06-crown ether complex CWFe6.