Summary
The acyl substituents of N,N-disubstituted N'-acylthioureas have a significant influence on the polarity of the chelates formed. A considerable decrease in the stability of the complexes is observed changing from aromatic to aliphatic acyl substituents. In order to separate the acylthiourea complexes, high performance thin-layer chromatography (HPTLC) methods have been used, whereby both standard methods, adsorption chromatography on silicagel layers and RP-chromatography are applicable. The strong UV-absorption properties of acylthiourea chelates allow a very sensitive detection of the separated complexes. By the method described several metals can be determined simultaneously on a migration distance of 2 to 5 cm.
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Schuster, M., Kugler, B. & König, KH. The chromatography of metal chelates. Fresenius J Anal Chem 338, 717–720 (1990). https://doi.org/10.1007/BF00323412
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DOI: https://doi.org/10.1007/BF00323412