Other characterization studies showed that substituted bipyridine acted as a tridentate ligand
, with two pyridine N and one carboxylic O atom as binding sites per ligand molecule.
3-(2-(2-hydroxy-3-methoxybenzylidene)hydrazono)indolin-2-one, acted as a tridentate ligand
and coordinated through phenolic oxygen, azomethine nitrogen and carbonyl group.
From the IR data in Table 7, it was analyzed that L1 acts as a tridentate ligand
by coordinating through -O of the deprotonated phenolic group, -O of another deprotonated -OH group formed due to enolization, and -N of the azomethine group.
The synthetic route for the preparation of tridentate ligand
HNMAMQ is as follows.
This can be achieved by using a dibasic tridentate ligand
around octahedral molybdenum(VI) [9-13].
In these complexes the organic molecule HL acts as tridentate ligand
through NNO donor centres.
Tyrosine is a potentially tridentate ligand
but it coordinates only through the carboxylato oxygen.
Histidine is a tridentate ligand
having amino, imidazole, and carboxylate groups as binding sites.
This study shows that synthesized Schiff base (BHMQMHI) acts as tridentate ligand
coordinating to metal ion through azomethine nitrogen, carbonyl oxygen, and phenolic oxygen atom via deprotonation.
Early examples of metallic grids employed different bidentate and tridentate ligands
based on bi(pyridines) (Youinou, et al., 1992) and terpyridines (Garcia, et al., 1999).
These substances that have been synthesized by our group incorporate heterocyclic bidentate (N[conjunction]N) and tridentate ligands
(N[conjunction]N[conjunction]N) with or without carboxylic acid ancillary functionalities displaying typical octahedral coordination geometries as the majority of ruthenium(II) coordination compounds (structurally related compounds).
Depending on the pH and metal atom, amino acids can act as monodentate, bidentate and tridentate ligands
and they can be either bridging or non- bridging ligands [17-19].