Hi, Sonal!

Here is at least one publication with a cerium tartrate structure. I am sure there are more trivalent metal ions that form such complexes.

Regards,

Daniel

Many transition metal ions can form stable complexes with tartarate as bidentate ligand. The most well known complex is the  Fehling's solution, the complex of tartarate with copper (II). It can be easily made and an interesting complex.

Cobalt and Iron form complexes with tartrate ion.