In situ complexation versus complex isolation in synthesis of ion imprinted polymers

Katri Laatikainen (1) , Catherine Branger (2) , Bruno Coulomb (3) , Véronique Lenoble (4) , Tuomo Sainio (1)

1 LUT - Lappeenranta University of Technology
2 MAPIEM - Laboratoire Matériaux Polymères Interfaces Environnement Marin - EA 4323
3 LCE - Laboratoire Chimie de l'environnement
4 PROTEE - Processus de Transfert et d'Echanges dans l'Environnement - EA 3819

In this study, the object is to prove that isolation of complexes made by varying the metal/ligand ratio (in situ complexation) yields similar polymer characteristics, metal binding and selectivity results as polymers synthesized by isolating the complex by precipitation. Complexation between nickel and the N-(4-vinylbenzyl)-2-(aminomethyl)pyridine (Vbamp) monomer was studied in dimethyl sulfoxide (DMSO) and in a DMSO-methanol mixture (50:50, v/v) at 80 °C using a Ni(NO 3) 2 ·6H 2 O salt as the nickel source. According to the results, the three nickel/Vbamp complexes could be selectively obtained using specific conditions: for [Ni(Vbamp)] 2 + the Ni/ Vbamp ratio in DMSO was 1.08, for [Ni(Vbamp) 2 ] 2 + the Ni/Vbamp ratio DMSO-methanol (50:50, v/v) was 0.49 and for [Ni(Vbamp) 3 ] 2 + the Ni/Vbamp ratio in DMSO was 0.3. Ion-imprinted polymers (IIPs) were prepared either with [Ni(Vbamp)](NO 3) 2 , [Ni(Vbamp) 2 ](NO 3) 2 , or [Ni(Vbamp) 3 ](NO 3) 2 complexes as the template. IIP with a [Ni(Vbamp) 3 ] 2 + complex, isolated by precipitation prior to polymerization, was also prepared. The results demonstrated that surface properties, nickel binding and selectivity properties were similar for both kind of IIPs – prepared by in situ complexation or isolation of the complex prior to polymer synthesis. Selectivity coefficients of nickel toward zinc for IIPs with [Ni(Vbamp)] 2 + , [Ni(Vbamp) 2 ] 2 + and [Ni(Vbamp) 3 ] 2 + templates were close to 1038, 1441 and 1463, respectively.

Mots clés: (Vbamp); Nickel; Distribution of complexes; Ion imprinted polymers (IIP); N-(4-vinylbenzyl)-2-(aminomethyl)pyridine; Isolation of complexes

Domaines: Polymères; Chimie de coordination

Katri Laatikainen, Catherine Branger, Bruno Coulomb, Véronique Lenoble, Tuomo Sainio. In situ complexation versus complex isolation in synthesis of ion imprinted polymers. Reactive and Functional Polymers, 2018, 122, pp.1-8. ⟨10.1016/j.reactfunctpolym.2017.10.022⟩. ⟨hal-01636288⟩