Poly-methyldopa (PMDP)-coated Fe₃O₄ nanoparticles (Fe₃O₄@PMDP) have been synthesized through a simple and green procedure. In the present study, for the first time, Pd nanoparticles were successfully deposited using Fe₃O₄@PMDP as a core-shell magnetic coordinator and stabilizer agent. In this protocol, Pd ions were adsorbed on surfaces of Fe₃O₄@PMDP through immersion of the PMDP-coated Fe₃O₄ nanoparticles into a palladium plating bath. Next, they were reduced in situ to palladium nanoparticles using PMDP’s N-containing groups and reducing ability. The structure, morphology and physicochemical properties of the synthesized nanoparticles were characterized by different analytical techniques such as energy-dispersive X-ray spectroscopy (EDS), field emission scanning electron microscope (FESEM), Fourier-transform infrared spectroscopy (FT-IR) spectroscopy, high resolution transmission electron microscopy (HR-TEM), inductively coupled plasma (ICP), thermo gravimetric analysis (TGA), vibrating sample magnetometer (VSM), and X-ray photoelectron spectroscopy (XPS). Core-shell Fe₃O₄@PMDP/Pd(0) nanoparticles showed excellent catalytic performance as a reusable nanocatalyst for cyanation of aryl iodides and bromides with K₄[Fe(CN)₆] as the cyanating agent. The nitriles were obtained in good to excellent yield and the catalyst can be recycled and reapplied up to seven times with only very slight decrease in its catalytic performance.

聚甲基多巴（PMDP）涂层的Fe ₃ O ₄纳米粒子（Fe ₃ O ₄ @PMDP）已通过简单且绿色的过程合成。在本研究中，首次使用Fe ₃ O ₄ @PMDP作为核壳磁性配位剂和稳定剂成功沉积了Pd纳米颗粒。在该协议中，通过将涂覆有PMDP的Fe ₃ O ₄纳米颗粒浸入钯电镀液中，Pd离子被吸附在Fe ₃ O ₄ @PMDP的表面上。接下来，使用PMDP的N将其原位还原为钯纳米颗粒含基团和还原能力。利用不同的分析技术，如能量色散X射线光谱（EDS），场发射扫描电子显微镜（FESEM），傅立叶变换红外光谱（FT-IR）光谱，对合成纳米颗粒的结构，形态和理化性质进行了表征。 ，高分辨率透射电子显微镜（HR-TEM），电感耦合等离子体（ICP），热重分析（TGA），振动样品磁力计（VSM）和X射线光电子能谱（XPS）。核-壳型Fe ₃ O ₄ @ PMDP / Pd（0）纳米颗粒具有出色的催化性能，可作为可重复使用的纳米催化剂，用于用K ₄ [Fe（CN）₆氰化芳基碘化物和溴化物。]作为氰化剂。所获得的腈的收率高至优异，催化剂可循环使用多达7次，而催化性能仅略有下降。