Rare earth corrosion inhibitors carboxylate complexes

6 Rare earth corrosion inhibitors carboxylate complexes 

This section is devoted solely to rare earth caiboxylates, as they are potential (or actual) dual function corrosion inhibitors. The largest class of rare earth polymeric complexes is that which contains carboxylate ligands. These oxophihc metals are well suited to forming complexes with carboxylate ligands. Many examples of 

The presence of an aromatic ring in a rare earth carboxylate complex may enable Jt-Jt stacking, while the presence of hydrogen bonding within a crystal lattice may allow the interhnking of molecular building blocks, chains and 2-D networks into higher dimensional stmctures. Thus non-covalent interactions may allow the assembly of complex supramolecular netwoiks.  

Rare earth carboxylates are typically prepared by refluxing the appropriate acid (or anhydride) with the metal carbonate, oxide or hydroxide or by reaction of a Ln metal salt with a stoichiometric amount of sodium, potassium or anunonium caiboxylate in aqueous or alcoholic media (Eqs 1.1-1.6)  

A variation of metathesis equation (Eq. 1.6) is the reaction between a rare earth metal salt and a carboxylic acid followed by addition of an alkali metal hydroxide imtil precipitation of the rare earth caiboxylate occius (Eq. 1.7), normally at pH = 5-7. 

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