Cobalticinium ligands

Simple condensation reactions of cobalticinium hexafluorophosphate activated ester and 1,1 -bis(chlorocarbonyl)cobalticinium chloride with various amines produced new acyclic tripodal, and 1,1 -bis-substituted amide-linked cobalticinium ligands in very good yields. (Schemes 1 and 2). 

Cobalticinium reacts with hydride to give a neutral, 18-electron sandwich compound in which one cyclopentadienyl ligand has been modified into as... 

We have previously reported that an ester-linked polycobalticinium macrocyclic ligand (11) can bind and electrochemically detect the bromide guest anion, whereas simple acyclic cobalticinium ester derivatives do not complex anions. However, the poor solubility of these types of macrocyclic ligands coupled with their arduous syntheses and lability to ester hydrolysis led us to a new synthetic strategy which ultilised the amide linkage to construct novel potential acyclic anion receptors . ... 

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