Jozef Hodyl PhD Thesis - Theses - Flinders University

35This material was obtained with a loading of 0.41 mmol of macrocycle per gram offunctionalised silica. It was used to investigate the attached macrocycles selectivitytoward Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ and Cd 2+ in aqueous solution by atomic absorptionspectrometry. 153 They found, not unexpectedly, that 35 demonstrated selectivitytoward Cu 2+ when confronted with a mixture of all the metal ions mentioned. 153An example of silica tethered tetraazamacrocycles being used for extraction ofuranyl ions from aqueous solution comes from Barbette et al. in 2004. 132 Theyprepared functionalised silica materials with either a derivatised cyclen, 36, orcyclam, 37, moiety attached via a linker arm. 132 This was done by two differentmethods. Method one required firstly functionalising a silica surface with a linkermolecule using 3-chloropropyltriethoxysilane then attaching the macrocycle. 132Method two involved firstly attaching a linker molecule with 3-iodopropyltriethoxysilane to the one of the macrocycle's nitrogen atoms and thenfunctionalising the three remaining nitrogen atoms with propionate pendant armsfollowed by anchorage on silica. 13229