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1. Smart metallopoly(l-glutamic acid) polymers: reversible helix-to-coil transition at neutral pH

Author:
Piedra-Arroni, Estefania,   et al.   ; Bonduelle, Colin; Makni, Fatma; Severac, Laura; Serpentini, Charles-Louis; Lecommandoux, Sébastien; Pratviel, Geneviève;     Show all 7 Authors
Source:
RSC advances 2016 v.6 no.88 pp. 84694-84697
ISSN:
2046-2069
Subject:
amino acids; aqueous solutions; coordination compounds; pH; polyglutamic acid; polypeptides; zinc
Abstract:
... Among the smart polymers, smart polypeptides have a unique polymeric scaffold made of amino acids whose structuring can be controlled by an external stimuli. Herein we present how coordination chemistry to Zn species can be reversibly used to control the helix-to-coil transition of synthetic poly(l-glutamic acid) (PGA) polymers at a neutral pH of 7 in aqueous solutions. ...
DOI:
10.1039/c6ra19753a

2. Ring-Opening Polymerization with Zn(C6F5)2-Based Lewis Pairs: Original and Efficient Approach to Cyclic Polyesters

Author:
Piedra-Arroni, Estefanía,   et al.   ; Ladavière, Catherine; Amgoune, Abderrahmane; Bourissou, Didier;     Show all 4 Authors
Source:
Journal of the American Chemical Society 2013 v.135 no.36 pp. 13306-13309
ISSN:
1520-5126
Subject:
composite polymers; molecular weight; phosphine; polyesters; polymerization; zinc
Abstract:
... Dual systems combining Zn(C₆F₅)₂ with an organic base (an amine or a phosphine) promote the controlled ring-opening polymerization of lactide and ε-caprolactone. The Lewis pairs cooperate to activate the monomers, affording well-defined high molecular weight cyclic polyesters. Efficient chain-extension gives access to cyclic block copolymers. ...
DOI:
10.1021/ja4069968