Scandium(0) nanoparticles: synthesis and follow-up reactions Lara-Pauline Faden a , Radian Popescu b , D. Gerthsen b , and Claus Feldmann* a a Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131 Karlsruhe, Germany b Laboratory for Electron Microscopy, Karlsruhe Institute of Technology (KIT) Engesserstraße 7, 76131 Karlsruhe, Germany The synthesis of base-metal nanoparticles is challenging due to their high reactivity, including instantaneous ignition when in contact to oxygen or other oxidizing agents. On the other hand, the high reactivity of base-metal nanoparticles can be used in follow-up reactions to obtain new compounds at moderate conditions. We show the first liquid-phase synthesis of high-quality scandium(0) nanoparticles via naphthalenide-driven reduction. [1] Scandium(0) nanoparticles were prepared by reduction of ScCl 3 with lithium naphthalenide in 1,2-dimethoxyethane. A particle size of 2.4±0.2nm was determined by TEM. The presence of zerovalent scandium nanoparticles and their crystallinity were confirmed by Fourier transformation (FT) analysis of high-resolution (HR)-TEM images. [1] In follow-up reactions with 2-mercaptopyridine (2-HMPy), 2,6-bis(2-benzimidazolyl)pyridine (H 2 BBP), carbazole (HCz) and N,N´-diphenylformamidine (HDPFA), new compounds were achieved and characterized by single- crystal X-ray structure analysis. With 2-HMPy a dinuclear [Sc(2-MPy) 3 ] 2 complex could be obtained, whereas a chain-type [(Py)Sc(BBP) 2 Na(Py) 2 ] 2 ×5Py was formed with H 2 BBP. The scandium centers in both compounds exhibit an unusual sevenfold coordination. A trigonal bipyramidal environment of the Sc 3+ in [(THF) 2 Sc(Cz) 3 ] 2 × 3 Tol was formed from the reaction with HCz whereas an antiprismatic coordination sphere in a non-inversion symmetric space group was achieved with HDPFA in the compound Sc(DPFA) 3 . [2] References 1. D. Bartenbach, O. Wenzel, R. Popescu, L. Faden, A. Reiß, M. Kaiser, A. Zimina, J. Grunwaldt, D. Gerthsen, C. Feldmann, Angew. Chemie 2021, 133 , 17513–17517. 2. L. Faden, A. Reiß, R. Popescu, C. Donsbach, N. Klaassen, D. Gerthsen, T. Vitova, C. Feldmann, 2023, in preparation .
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