Lalioti Nikolia, Charitos Alexander, Parthenios John, Malina Ondrej, Polaskova Michaela, Petr Martin, Tangoulis Vassilis
Laboratory of Inorganic Chemistry, Department of Chemistry, University of Patras, 26504 Patras, Greece.
Institute of Chemical Engineering Sciences (ICE-HT), Foundation for Research and Technology-Hellas (FORTH), 26504 Patras, Greece.
Molecules. 2023 Aug 2;28(15):5816. doi: 10.3390/molecules28155816.
A novel experimental protocol based on a reverse micellar method is presented for the synthesis of graphene oxide (GO)-based hybrids with spin crossover nanoparticles (SCO NPs) of the 1D iron(II) coordination polymer with the formula Fe(NHtrz). By introducing different quantities of 0.5% and 1.0% of GO (according to iron(II)) into the aqueous phase, two hybrids, and , were synthesized, respectively. The morphological homogeneity of the NPs on the surface of the GO flakes is greatly improved in comparison to the pristine Fe(NHtrz) NPs. From the magnetic point of view and at a low magnetic sweep rate of 1 K/min, a two-step hysteretic behavior is observed for and , where the onset of the low-temperature second step appeared at 40% and 30% of the HS fraction, respectively. For faster sweep rates of 5-10 K/min, the two steps from the cooling branch are progressively smeared out, and the critical temperatures observed are T↑ = 343 K and T↓ = 288 K, with a thermal width of 55 K for both and . A Raman laser power-assisted protocol was used to monitor the thermal tolerance of the hybrids, while XPS analysis revealed electronic interactions between the SCO NPs and the GO flakes.
本文提出了一种基于反胶束法的新型实验方案，用于合成基于氧化石墨烯（GO）的杂化物，该杂化物与一维铁（II）配位聚合物Fe(NHtrz)的自旋交叉纳米颗粒（SCO NPs）相结合。通过将不同量的0.5%和1.0%的GO（基于铁（II））引入水相，分别合成了两种杂化物 和 。与原始的Fe(NHtrz) NPs相比，GO薄片表面NPs的形态均匀性得到了极大改善。从磁性角度来看，在1 K/min的低磁场扫描速率下，观察到 和 呈现两步滞后行为，其中低温第二步的起始分别出现在HS分数的40%和30%处。对于5 - 10 K/min的更快扫描速率，冷却分支的两步逐渐模糊，观察到的临界温度为T↑ = 343 K和T↓ = 288 K， 和 的热宽度均为55 K。采用拉曼激光功率辅助方案监测杂化物的热耐受性，而XPS分析揭示了SCO NPs与GO薄片之间的电子相互作用。
