Selective lanthanide sorption and mechanism using novel hybrid Lewis base (N-methyl-N-phenyl-1,10-phenanthroline-2-carboxamide) ligand modified adsorbent

Awual, M. R.; Kobayashi, Toru ; Miyazaki, Yuji; Motokawa, Ryuhei   ; Shiwaku, Hideaki   ; Suzuki, Shinichi; Okamoto, Yoshihiro  ; Yaita, Tsuyoshi

The oxygen and nitrogen donor atoms containing Lewis base N-methyl-N-phenyl-1,10-phenanthroline-2-carboxamide (MePhPTA) ligand was synthesized and subsequently an adsorbent was prepared by direct immobilization onto mesoporous silica. The crystallography for the Sm-MePhPTA complex suggested that MePhPTA was strongly coordinated to Sm(III) with oxygen and nitrogen by forming a stable complex with two 5-membered rings. The data clarified that bond lengths between Sm(III) and amide oxygen (2.475 ) were shorter than Sm-N (2.662 ) in phenanthroline moiety indicating strong oxygen driven adsorbent.