RT Journal Article
T1 The role of Polymer–AuNP interaction in the stimuli-response properties of PPA–AuNP nanocomposites
A1 Núñez Martínez, Manuel
A1 Díaz Arias, Sandra Natalia
A1 Bergueiro Álvarez, Julián
A1 Quiñoá Cabana, Emilio
A1 Riguera Vega, Ricardo
A1 Freire Iribarne, Félix Manuel
K1 Chirality
K1 Gold nanoparticles
K1 Helical polymers
K1 Nanocomposites
AB The helical sense control of dynamic helical polymers such as poly(phenylacetylene)s (PPAs) is greatly affected when they are conjugated to AuNPs through a strong thiol-Au connection, which restricts conformational changes at the polymer. Thus, the classical thiol-MNP bonds must be replaced by weaker ones, such as supramolecular amide–Au interactions. A straightforward preparation of the PPA–Au nanocomposite by reduction of a preformed PPA–Au3+ complex cannot be used due to a redox reaction between the two components of the complex which degrades the polymer. To avoid the interaction between the PPA and the Au3+ ions before the reduction takes place, the metal ions are added to the polymer solution capped as a TOAB complex, which keeps the PPA stable due to the lack of PPA–Au3+ interactions. Ulterior reduction of the Au3+ ions by NaBH4 affords the desired nanocomposite, where the AuNPs are stabilized by supramolecular anilide–AuNPs interactions. By using this approach, 3.7 nm gold nanoparticles are generated and aligned along the polymer chain with a regular distance between particles of 6 nm that corresponds to two helical pitches. These nanocomposites show stimuli-responsive properties and are also able to form macroscopically chiral nanospheres with tunable size
PB Wiley
YR 2021
FD 2021
LK http://hdl.handle.net/10347/29087
UL http://hdl.handle.net/10347/29087
LA eng
NO Macromol. Rapid Commun. 2022, 43, 2100616. https://doi.org/10.1002/marc.202100616
NO Financial support from AEI (PID2019-109733GB-I00), Xunta de Galicia (ED431C 2018/30, Centro Singular de Investigación de Galicia acreditación 2019–2022, ED431G 2019/03, Beca Leonardo a Investigadores yCreadores Culturales 2020 de la Fundación BBVA and the European Regional Development Fund (ERDF) and is gratefully acknowledged. N.-M. thanks MICINN for a FPI contract (BES-2016-078107)
DS Minerva
RD 28 abr 2026