CHEMICALLY BONDED CHELATES AS SELECTIVE COMPLEXING SORBENTS FOR GAS-CHROMATOGRAPHY .3. SILICA CHEMICALLY-MODIFIED BY N-BENZOYLTHIOUREA GROUPS

High stability and simple synthesis from inexpensive starting material s make it possible to use the N-benzoylthiourea groups as modifiers of silica for complexation gas chromatography. Taking advantage of the c helating properties of N-benzoylthiourea, copper(II) ions were bonded with SiO2 to give a packing capable of entering into pi-type interacti ons with adsorbates with electron-donor properties such as linear and branched alkenes and aromatic and cyclic hydrocarbons. The high select ivity of the packing obtained permitted the separation of complex mixt ures (including isomers) of different classes of organic compounds.