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The TiMnSi 2 -type (space group  Pbam ) germanides Sc T Ge 2  ( T  = Fe, Co, Ru, Rh) were synthesized from the elements by arc-melting. Single crystals were grown by annealing sequences of the arc-melted buttons in an induction furnace. The structures of ScFeGe 2 , ScRuGe 2  and ScRhGe 2  were refined from single-crystal X-ray diffraction data. In ScRuGe 2 , the ruthenium atoms have distorted octahedral germanium coordination (242–268 pm Ru–Ge). Three  trans -face-sharing octahedra form a sub-unit which is condensed via common edges in  c  direction and connected  via  common corners with four adjacent blocks, forming a three-dimensional [RuGe 2  type] substructure. The two crystallographically independent scandium sites have coordination numbers 15 (Sc1@Ge 8 Ru 4 Sc 3 ) and 17 (Sc2@Ge 7 Ru 6 Sc 4 ). Electronic band structure calculations for ScCoGe 2  and ScRuGe 2  show a net charge transfer from the scandium to the transition metal and germanium atoms, leading to a description with polyanionic networks Sc  δ + [ T Ge 2 ] δ− . The two crystallographically independent Sc sites are easily distinguishable by  45 Sc magic-angle spinning (MAS)-NMR spectroscopy. Isotropic chemical shift values and nuclear electric quadrupolar interaction parameters were deduced from an analysis of the triple-quantum (TQ)-MAS NMR spectra. The electric field gradient parameters deduced from these experiments are in good agreement with quantum-chemical calculations using the  Wien 2 k  code. Likewise, the two crystallographically independent iron sites in ScFeGe 2  could be discriminated in the  57 Fe Mößbauer spectra through their isomer shifts and quadrupole splitting parameters:  δ  = 0.369(1) mm s −1  and ∆ E  Q  = 0.232(2)  mm s −1  for Fe1 and  δ  = 0.375(2) mm s −1  and ∆ E  Q  = 0.435(4) mm s −1  for Fe2 (data at  T  = 78 K).

The germanides Sc T Ge 2 ( T = Fe, Co, Ru, Rh) – crystal chemistry, 45 Sc solid-state NMR and 57 Fe Mössbauer spectroscopy