N,S Ligands for Preconcentration or Elimination of Heavy Metals. Synthesis and Characterisation of Aminoethanethiols and Aminoethanethiol-modified Silica Gel
Molecular (N,S) aminothiols R(CH2)3NH(CH2)2SH (1), R(CH2)3NH(CH2CHMe)SH (2), R(CH2)3NH(CH2)2S(CH2)2SH (3), R(CH2)3NH(CH2CHMe)S(CH2CHMe)SH (4) and R(CH2)3N[(CH2)2SH]2 (5) [R=(EtO)3Si] have been prepared by a one step reaction of olefin sulfide on aminopropyltriethoxysilane and characterised by physicochemical methods; the grafting of 1 on silica is reported.