Patent ID: 8563738

Claim:
A multidentate ligand of Formula (II): wherein each of Z 6 , Z 7 , and Z 8 is a 2-benzimidazolyl group bearing a substituent, —(CH 2 ) m —R 5 ; each R 5 is independently selected from the group consisting of —C(O)OH, —C(O)OM, —C(O)OR 6 , —C(O)NHR 7 , and —C(O)R 8 ; each M is an alkali metal ion or ammonium ion; each R 6 and R 7 is independently a C 1 -C 6 -alkyl group; each R 8 is independently H or a C 1 -C 6 -alkyl group; and each m is independently 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10.