Porous Polymers: Liquid Chromatography

increase in the surface area, demonstrating that the Fe(III) ions work by making the resin porous. The use of these two metal ions enables efRcient NO adsorption. The polymeric resin as well as the metal complex itself greatly affects the adsorbing ability for the target gas molecules as described in the case of CO, C2H4, and NO adsorption. It has been demonstrated clearly that large surface area directly contributes to the rapid adsorption of gaseous molecules. In some cases, the nature of the support dominates the whole adsorption property of the polymer}metal complex rather than the nature of the metal complex. Therefore, further regulation of porosity (e.g. pore size distribution) is quite signiRcant in order to achieve efRcient separation of the target gas. Metal complexes are promising compounds for reversible coordination of gaseous molecules so that metal complexes immobilized on polymeric supports with properly regulated porosity will provide further useful materials for efRcient gas separation.