Insoluble π‐Conjugated Polyimine as an Organic Adsorbent for Group 10 Metal Ions

Metal ion adsorbents are indispensable materials for the recovery of noble metal ions in a sustainable society. Herein, we report that poly(isopyrazole-3,5-diyl-trans-vinylene) (1) effectively adsorbed group 10 from solution acetonitrile. Owing to its fully π-conjugated and rigid structure, polyimine 1 was virtually insoluble common organic solvents water, making it advantageous adsorption via solid/liquid interface. Inductively coupled plasma (ICP) analysis showed ≥90 % Ni2+, Pd2+, Pt2+ were at concentration μM (order ≤2 ppm) after stirring suspensions room temperature. desorption achieved by treatment with ethylenediaminetetraacetic acid disodium salt (EDTA ⋅ 2Na), adsorbent reused. Theoretical calculations supported desolvation energy an important factor effective