SEMI-QUANTITATIVE APPROACHES TO THE COORDINATION ABILITY OF o-BISGUANIDINOBENZENES WITH METAL SALTS

摘要

In order to uncover the potential functionality of o-bisguanidinobenzenes the ability of 1,2-bis(1,3-diethylethyleneguanidino)benzene to form complexes with eighteen kinds of metal salts in aqueous media was examined.Complex formation ability was judged by spectral analysis,including elemental analysis,of products obtained as water-insoluble precipitates,as water-soluble and chloroform-extractable materials,or as water-soluble and chloroform-unextractable materials.Positive coordination was observed with many metal salts used.Tight water-insoluble and crystalline complexes were formed in the cases of cobalt(II),zinc(II),and cadmium(II)salts,in the first two cases among which products were analyzable by X-ray crystallography.In addition,treatment of the complex with aqueous alkali re-produced the original bisguanidinobenzene quantitatively,indicating the promising use as a recyclable ligand.