Folgado Enrique, Guerre Marc, Mimouni Nidhal, Collière Vincent, Bijani Christian, Moineau-Chane Ching Kathleen, Caminade Anne-Marie, Ladmiral Vincent, Améduri Bruno, Ouali Armelle
Institut Charles Gerhardt - UMR 5253 - CNRS, UM, ENSCM, 8 Rue de l'Ecole Normale, 34296, Montpellier Cedex 5, France.
Laboratoire de Chimie de Coordination du CNRS, 205 Route de Narbonne, BP 44099, 31077, Toulouse Cedex 4, France.
Chempluschem. 2019 Jan;84(1):78-84. doi: 10.1002/cplu.201800471. Epub 2018 Dec 18.
This study investigates the non-covalent coating of cobalt magnetic nanoparticles (MNPs) involving a graphene surface with pyrene-tagged dendritic poly(vinylidene fluoride) (PVDF). Dendrimers bearing a pyrene moiety were selected to play the role of spacers between the graphene surface of the MNPs and the PVDF chains, the pyrene unit being expected to interact with the surface of the MNPs. The pyrene-tagged dendritic spacer 11 decorated with ten acetylenic units was prepared and fully characterized. Azido-functionalized PVDF chains were then grafted onto each branch of the dendrimer using Huisgen's [3+2] cycloaddition reaction. Next, the association of the resulting pyrene-tagged dendritic PVDF 13 with commercially available Co/C MNPs by π-stacking interactions was studied by fluorescence spectroscopy. Evaluated were the stability of the π-stacking interactions when the temperature increased and the reversibility of the process when the temperature decreased. Also, hybrid MNPs were prepared from pyrene-tagged dendrimers decorated either with acetylenic functions (11) or with PVDF branches (13), and they were characterized by transmission electron microscopy and comparative elemental analysis was carried out with naked MNPs.
本研究探讨了钴磁性纳米颗粒（MNP）的非共价涂层，该涂层涉及带有芘标记树枝状聚偏二氟乙烯（PVDF）的石墨烯表面。选择带有芘部分的树枝状聚合物作为MNP的石墨烯表面与PVDF链之间的间隔物，预计芘单元会与MNP表面相互作用。制备并全面表征了带有十个炔基单元的芘标记树枝状间隔物11。然后使用惠斯根[3+2]环加成反应将叠氮基官能化的PVDF链接枝到树枝状聚合物的每个分支上。接下来，通过荧光光谱研究了所得芘标记树枝状PVDF 13与市售Co/C MNP通过π-堆积相互作用的缔合。评估了温度升高时π-堆积相互作用的稳定性以及温度降低时该过程的可逆性。此外，由带有炔基官能团（11）或PVDF分支（13）的芘标记树枝状聚合物制备了杂化MNP，并通过透射电子显微镜对其进行了表征，并与裸MNP进行了对比元素分析。
