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Two borides, ScRu 2 B 3 and Sc 2 RuB 6 , were obtained by argon-arc melting of the elements followed by annealing at 800 °C. ScRu 2 B 3 exhibits a new structure type with the space group Cmcm (a = 3.0195(2) Å, b = 15.4056(8) Å, c = 5.4492(3) Å; single crystal X-ray data; R F  2 = 0.0105). Sc 2 RuB 6 adopts the Y 2 ReB 6 -type structure (space group Pbam; a = 8.8545(2) Å, b = 11.1620(3) Å, c = 3.4760(1) Å; single crystal X-ray data; R F  2 = 0.0185). ScRu 2 B 3 displays an unusual intergrowth of CeCo 3 B 2 - and AlB 2 -related slabs; a striking feature is a boat configuration of puckered boron hexagons within infinite graphite like boron layers (6 3 nets). Sc 2 RuB 6 presents two-dimensional planar nets of condensed boron pentagons, hexagons, and heptagons sandwiched between metal layers. In Sc/Y substituted Y 2 ReB 6 -type, Y atoms are distributed exclusively inside the boron heptagons. Exploration of the Sc-Ru-B system at 800 °C including binary boundaries employing EPMA and powder X-ray diffraction technique furthermore rules out the existence of previously reported "ScRuB 4 " but confirms the formation and crystal structure of Sc 2 Ru 5 B 4 . ScRu 4 B 4 forms in cast alloys (LuRu 4 B 4 -type structure; space group I4 1 /acd (No. 142), a = 7.3543(2) Å, c = 14.92137(8) Å). Cell parameters and atomic coordinates have been refined for ScRu 2 B 3 , Sc 2 RuB 6 , and ScRu 4 B 4 in the scope of the generalized gradient approximation. Ab initio electronic structure calculations indicate a moderate electronic density of states at the Fermi level situated near the upper edge of essentially filled d-bands. Electrical resistivity measurements characterize ScRu 2 B 3 and Sc 2 RuB 6 as metals in concord with electronic band structure calculations.

ScRu2B3 and Sc2RuB6: Borides Featuring a 2D Infinite Boron Clustering

ScRu₂B₃ and Sc₂RuB₆: Borides Featuring a 2D Infinite Boron Clustering