title: Synthesis, isolation, and spectroscopic characterization of holmium-based mixed-metal nitride clusterfullerenes: HoxSc3-xN@C80 (x=1, 2).
abstract: The synthesis, isolation and spectroscopic characterization of holmium-based mixed metal nitride clusterfullerenes Ho(x) Sc(3-x) N@C(80)  (x=1, 2) are reported. Two isomers of Ho(x) Sc(3-x) N@C(80)  (x=1, 2) were synthesized by the reactive gas atmosphere method and isolated by multistep recycling HPLC. The isomeric structures of Ho(x) Sc(3-x) N@C(80)  (x=1, 2) were characterized by laser-desorption time-of-flight (LD-TOF) mass spectrometry and UV/Vis/NIR, FTIR and Raman spectroscopy. A comparative study of M(x) Sc(3-x) N@C(80)  (M=Gd, Dy, Lu, Ho) demonstrates the dependence of their electronic and vibrational properties on the encaged metal. Despite the distinct perturbation induced by 4f(10)  electrons, we report the first paramagnetic (13) C NMR study on Ho(x) Sc(3-x) N@C(80)  (I; x=1, 2) and confirm I(h) -symmetric cage structure. A (45) Sc NMR study on HoSc(2) N@C(80)  (I, II) revealed a temperature-dependent chemical shift in the temperature range of 268-308 K.
authors: Group of Electrochemistry and Conducting Polymers, Leibniz-Institute for Solid State and Materials Research (IFW) Dresden, 101171 Dresden, Germany.
authors: Yang
authors: Y
authors: Zhang
authors: Alexey A
authors: AA
authors: Popov
authors: Sandra
authors: S
authors: Schiemenz
authors: Lothar
authors: L
authors: Dunsch