A1 Journal article (refereed), original research

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


Open Access publication

Publication Details
Authors: Laatikainen Katri Branger Catherine, Coulomb Bruno, Lenoble Véronique, Sainio Tuomo
Publisher: Elsevier
Publication year: 2018
Language: English
Related Journal or Series Information: Reactive and Functional Polymers
Volume number: 122
Start page: 1
End page: 8
Number of pages: 8
ISSN: 1381-5148
eISSN: 1873-166X
JUFO-Level of this publication: 1
Open Access: Open Access publication

Abstract


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 80oC using a Ni(NO3)2.6H2O
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)](NO3)2, [Ni(Vbamp)2](NO3)2,
or [Ni(Vbamp)3](NO3)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.




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Last updated on 2019-13-03 at 12:00