Hydroxycarbonyl complexes, preparation

An alternative preparation method for metal TjHCl-COa complexes is the deprotonation of hydroxycarbonyl complexes 25). A general route for the preparation of hydroxycarbonyl complexes is a nucleophilic attack of OH" or H2O on cationic metal carbonyl species (52) ... 

It must be remembered that with a buffer solution there is always the possibility of interaction between the substance under examination and the buffer components. The best known example of this type is the effect of borates which form complexes with e.g. a-dihydroxy or a-hydroxycarbonyl compounds and result in shifts, diminutions or complete suppressions of their polarographic waves (e.g. with benzil< > or ninhydrin< >). Similarly, the interaction of primary amines (ammonia, glycine) with carbonyl compounds may cause a change in polarographic behaviour. The ketimines formed by condensation are reduced in a new wave at potentials more positive than that of the carbonyl form. A simple wave for carbonyl compounds can be obtained with a veronal buffer or buffers prepared from tertiary amines over the pH-range 8-10. 

Monomethoxycarbonyl ruthenium complexes have been obtained by reaction of mthenium(O) clusters with methoxide anion in methanol [67]. Hydroxyl-carbonyl complexes of platinum were prepared by nucleophilic attack of OH on a carbonyl ligand [68] or by insertion of CO into a hydroxy platinum complex [69]. Hydroxycarbonyl-bpy complexes of ruthenium [21], iridium and rhodium [21] have been proposed as... 

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