Chromatography of metal complexes
View Patent ↗A high performance liquid chromatography method to routinely and reproducibly detect and quantitate metal complexes is provided. The metal complexes used in the method of the invention can be different metal complexes, or they can be stereoisomers of the same metal complexes. The high performance liquid chromatography method of the present invention is suitable for the separation of diastereomers of the same metal complexes. Also provided is a chiral high performance liquid chromatography method to separate enantiomers of metal complexes. Superoxide dismutase mimetic compounds are also provided.
1. A high performance liquid chromatography method comprising:
loading a solution containing a mixture of metal complexes comprising one or more of a Mn II (1,4,7,10,13-pentaazacyclopentadecane) complex having the structure
its diastereomers, its enantiomer, and imine oxidation products, onto a column,
eluting the metal complexes from the column with a mobile phase, said mobile phase comprising an excess of a salt of a coordinating anion in a solvent system, and
detecting the eluted metal complexes with a detector, wherein X is the coordinating anion.
2. The method of claim 1 wherein the metal complexes comprise products of a reaction stream.
3. The method of claim 1 wherein the mixture of metal complexes comprises the Mn II (1,4,7,10,13-pentaazacyclopentadecane)complex and its diastereomers.
4. The method of claim 1 wherein the mixture of metal complexes comprises the Mn II (1,4,7,10,13-pentaazacyclopentadecane)complex and its enantiomer, the enantiomer having the structure
wherein X is the coordinating anion.
5. The method of claim 1 wherein the coordinating anions comprise chloride anions, thiocyanate anions, stearate anions, acetate anions, trifluoroacetate anions, carboxylate anions, formate anions or azide anions.
6. The method of claim 1 wherein the salt comprises sodium chloride, lithium chloride, potassium chloride, ammonium chloride, tetrabutylammonium chloride, sodium thiocyanate, potassium thiocyanate, ammonium thiocyanate, lithium thiocyanate, potassium acetate, sodium acetate, ammonium acetate, ammonium trifluoroacetate, lithium acetate, potassium formate, sodium formate, ammonium formate, lithium formate, sodium cyanate, potassium cyanate, ammonium cyanate, potassium carboxylate, sodium carboxylate, lithium stearate, sodium stearate, sodium azide, potassium azide or lithium azide.
7. The method of claim 1 wherein the salt comprises sodium chloride, lithium chloride or tetrabutylammonium chloride.
8. The method of claim 7 wherein the sodium chloride is present in the mobile phase at a concentration of between about 0.1 M to about 1 M.
9. The method of claim 1 wherein the salt comprises ammonium thiocyanate, sodium thiocyanate or potassium thiocyanate.
10. The method of claim 1 wherein the solvent system comprises a solvent.
11. The method of claim 10 wherein the solvent comprises acetonitrile, dioxane, ethanol, methanol, isopropanol, tetrahydrofuran, or water.
12. The method of claim 1 wherein the solvent system comprises a mixture of solvents.
13. The method of claim 12 wherein the mixture of solvents comprises two or more of acetonitrile, dioxane, ethanol, methanol, isopropanol, tetrahydrofuran, and water.
14. The method of claim 13 wherein the solvents comprise acetonitrile and water.
15. The method of claim 13 wherein the solvents comprise methanol and water.
16. The method of claim 1 wherein the salt is present in the mobile phase at a concentration of between about 0.004 M to about 6 M.
17. The method of claim 1 wherein the column is selected from the group consisting of a C1 modified column, a C3 modified column, a C4 modified column, an octyl (C8) modified column, an octadecyl (C18) modified column, a C18 polymer column, a phenyl column, and an amino-cyano column.
18. The method of claim 1 wherein the column comprises a chiral column.
19. The method of claim 1 wherein the detector comprises a UV detector.