Strong binding metal-chelating resins

1. A metal-chelating resin, comprising:

(a) a compound represented by Formula (I):

or a stereoisomeric form thereof or a salt thereof, wherein

one of R 1 and R 2 , and one of R 3 and R 4 are independently a protonated or deprotonated, substituted or unsubstituted 2-hydroxybenzyl moiety containing at least one linking group for covalently linking the compound of Formula (I) to an organic polymer resin, wherein the at least one linking group is represented by the formula —(CH 2 ) x —NHR 5 where x is 2 to 6, and R 5 is independently hydrogen, methyl or ethyl, and the other one of R 1 and R 2 , and the other one of R 3 and R 4 are independently a protonated or deprotonated, substituted or unsubstituted carboxyalkyl-containing moiety, wherein the alkyl group is a substituted or unsubstituted methylene group or a substituted or unsubstituted ethylene group optionally containing another linking group for covalently linking the compound of Formula (I) to the organic polymer resin; and

R a , R b , R c and R d are hydrogen; and

(b) an organic polymer resin comprising a styrenic polymer or copolymer having at least one complementary reactive functional group covalently linked with the at least one linking group of the compound represented by Formula (I).

2. The metal-chelating resin of claim 1 , wherein R 5 is hydrogen.

3. The metal-chelating resin of claim 1 , wherein R 5 is methyl.

4. The metal-chelating resin of claim 1 , wherein R 5 is ethyl.

5. The metal-chelating resin of claim 1 , wherein the protonated or deprotonated, substituted or unsubstituted 2-hydroxybenzyl moiety independently is a moiety represented by the structure of Formula (II) or a moiety represented by the structure of Formula (III):

—CRR L -2-OH—C 6 Y 4   (II)

—CRR L -2-O—C 6 Y 4   (III)

wherein R is independently hydrogen, a linear or branched C 1 to C 4 alkyl moiety, a linear or branched C 1 to C 4 hydroxyalkyl or a linear or branched C 1 to C 4 alkyl moiety containing one or more ether linkages, R L is the linking group for covalently linking the compound of Formula (I) to the organic polymer resin, and Y is hydrogen.

6. The metal-chelating resin of claim 5 , wherein the protonated or deprotonated, substituted or unsubstituted carboxyalkyl-containing moiety independently is a protonated or deprotonated, substituted or unsubstituted carboxymethyl moiety represented by the structure of Formula (IV) or a protonated or deprotonated, substituted or unsubstituted carboxymethyl moiety represented by the structure of Formula (V):

—CRR L —CO 2 H  (IV)

—CRR L —CO 2   (V)

wherein R is independently hydrogen, a linear or branched C 1 to C 4 alkyl moiety, a linear or branched C 1 to C 4 hydroxyalkyl or a linear or branched C 1 to C 4 alkyl moiety containing one or more ether linkages, and R L is another linking group for covalently linking the compound of Formula (I) to the organic polymer resin.

7. The metal-chelating resin of claim 5 , wherein the protonated or deprotonated, substituted or unsubstituted carboxyalkyl-containing moiety independently is a protonated or deprotonated, substituted or unsubstituted carboxyethyl moiety represented by the structure of Formula (VI) or a protonated or deprotonated, substituted or unsubstituted carboxyethyl moiety represented by the structure of Formula (VII):

—CRR L —CRR L —CO 2 H  (VI)

—CRR L —CRR L —CO 2 −   (VII)

wherein R is independently hydrogen, a linear or branched C 1 to C 4 alkyl moiety, a linear or branched C 1 to C 4 hydroxyalkyl or a linear or branched C 1 to Ca alkyl moiety containing one or more ether linkages, and R L is another linking group for covalently linking the compound of Formula (I) to the organic polymer resin.

8. The metal-chelating resin of claim 5 , wherein the linking group is represented by the formula —(CH 2 ) x —NHR 5 where x is 2 to 6, and R 5 is hydrogen.

9. The metal-chelating resin of claim 5 , wherein the linking group is represented by the formula —(CH 2 ) x —NHR 5 where x is 2 to 6, and R 5 is methyl.

10. The metal-chelating resin of claim 5 , wherein the linking group is represented by the formula —(CH 2 ) x —NHR 5 where x is 2 to 6, and R 5 is ethyl.

11. The metal-chelating resin of claim 1 , wherein the compound of Formula (I) is represented by a compound having the structure of Formula (Ia):

wherein:

R″ is independently hydrogen or a linking group for covalently linking the compound of Formula (Ia) to the organic polymer resin, wherein at least one of R″ is a linking group represented by the formula —(CH 2 ) x —NHR 5 where x is 2 to 6, and R 5 is independently hydrogen, methyl or ethyl;

R′ is independently a protonated or deprotonated, substituted or unsubstituted carboxyalkyl-containing moiety, wherein the alkyl group is a substituted or unsubstituted methylene group or a substituted or unsubstituted ethylene group optionally containing another linking group for covalently linking the compound of Formula (Ia) to the organic polymer resin;

m and n are independently integers from 1 to 4; and;

R a , R b , R c and R d are hydrogen.

12. The metal-chelating resin of claim 11 , wherein R 3 is hydrogen.

13. The metal-chelating resin of claim 11 , wherein R 5 is methyl.

14. The metal-chelating resin of claim 11 , wherein R 5 is ethyl.

15. The metal-chelating resin of claim 11 , wherein R′ is independently a protonated or deprotonated, unsubstituted carboxymethyl moiety.

16. The metal-chelating resin of claim 11 , wherein R′ is independently a protonated or deprotonated, unsubstituted carboxyethyl moiety.