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Two phosphorus donor atoms

Common Applications of Bidenate Ligands

ZUD cleanser contains oxalic acid and is used to remove rust deposits by creating chelation complexes with the iron (III) ion from the Fe2O3. Rust reacts with oxalic acid to produce a colorless, water-soluble complex ion (i.e., [Fe(C2O4)3]3-) which contains the three of the bidentate oxalate ion ligands. The exposed carbonyls of  the complex ion make the complex water-soluble and the resulting complex can be washed away with water.

= Fe

= O

= C

Structures With Tridentate and Tetradentate Ligands

Some Tridentate Ligands

2,2';6',2"-terpyridine or terpy

diethylenetriamine or dien

A Tetradentate Ligand

triethylenetetramine,  or  trien

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