Silica gel bound cyclam. Synthesis and applications

Several silica gels containing cyclam have been synthesized using three dif ferent methods. The first two methods imply the modification of a commercia l silica gel while the latter involves a sot-gel approach. The macrocycle c ontents and the textural data of these materials are compared. The efficien cy of [Co(cyclam)](2+) grafted onto silica for binding dioxygen is reported . Finally, N-functionalization of the macrocycle has been performed. Such m odified silica gels might behave as highly selective ions exchangers.