Periodate

Periodate are the salts of various periodic acids; between Orthoperiodaten ( IO65 ), Metaperiodaten ( IO4 - ), Dimesoperiodaten ( I2O94 ) and Mesoperiodaten ( IO53 ) is differentiated by acid.

Representation

Periodates may be produced by electrochemical oxidation of iodates; Here, the anode is of lead dioxide. And in the oxidation with chlorine produced by iodates periodate. In alkaline solution formed at temperatures around 100 ° C from iodates and chlorine or hypochlorite acid salts of the form M5 nHnIO6 ( n = 2,3).

Properties

Orthoperiodate are only sparingly soluble in water, hydrolysis occurs; when heated decompose the salts. Periodates are strong oxidizing agents. Unlike perchlorates and perbromates, their reactions are often kinetically inhibited and despite sufficient oxidizing power require a substantial activation energy reactions with periodates are relatively fast.

Use

Periodates used in organic chemistry as an oxidizing agent capable of cleaving carbon-carbon bonds; here ( NaIO4 ) is used for the glycol cleavage ( Malaprade reaction), and preparation of predominantly deoxyribonucleotides sodium metaperiodate. Periodate remain highly selective etchant for certain ruthenium-containing oxides.

Examples

Electrochemistry Digital Object Identifier
642040
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