Issue 39, 2021

Thermoresponsive polymers as macromolecular coordination ligands: complexation-dependence of thermally induced aggregation in aqueous solution

Abstract

We have designed novel macromolecular coordination ligands (MCLs) by conjugation of thermoresponsive polymers based on poly(N-isopropylacrylamide) ([M with combining macron]n around 3 to 25 kg mol−1) with 1,2,4-triazole coordination sites. These triazole units were integrated into two fundamentally different MCL architectures via reversible addition–fragmentation chain transfer polymerization following two synthetic strategies: (I) The customized chain transfer agent 1-{[3-(4H-1,2,4-triazol-4-yl)propyl]amino}-2-methyl-1-oxopropan-2-yl dodecyl carbonotrithioate (DMP-APTRZ) was employed for hemi-telechelic MCLs with a single triazole end group. (II) A tailored comonomer N-[3-(4H-1,2,4-triazol-4-yl)propyl]methacrylamide (APTRZMAAm) provides access to multidentate MCLs with a controllable number of triazole side groups along the polymer backbone. The thermally controlled variation of the MCL volume demand in aqueous solution was exploited for reversible aggregate formation upon Fe2+ complexation. Thermal response was studied via UV/Vis turbidity measurements, aggregate dimensions were determined via DLS, while the aggregate morphology was analyzed via customized TEM.

Graphical abstract: Thermoresponsive polymers as macromolecular coordination ligands: complexation-dependence of thermally induced aggregation in aqueous solution

Supplementary files

Article information

Article type
Paper
Submitted
23 Jun 2021
Accepted
11 Aug 2021
First published
13 Aug 2021
This article is Open Access
Creative Commons BY-NC license

Polym. Chem., 2021,12, 5598-5612

Thermoresponsive polymers as macromolecular coordination ligands: complexation-dependence of thermally induced aggregation in aqueous solution

M. F. T. Meier, F. Thetiot, N. Pittala, I. Lieberwirth, C. Kunzler, S. Triki and U. Jonas, Polym. Chem., 2021, 12, 5598 DOI: 10.1039/D1PY00847A

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