New Scandium Platinum Silicides: ScPt₂Si with ‘Inverse’ MgCuAl₂ Structure and Sc₅Pt₉Si₇, a Variant of the Zr₂Fe₁₂P₇‐Type

Abstract

Abstract. Two new scandium platinum silicides, ScPt 2 Si (orthorhombic, Cmcm, a = 3.6653(6) Å, b = 9.831(1) Å, c = 6.967(1) Å, Z = 4) and Sc 5 Pt 9 Si 7 (hexagonal, P 6, a = 9.9418(5) Å, c = 3.8832(2) Å, Z = 1) were prepared by reaction of the elements in an electric arc furnace and subsequent annealing. The crystal structures were solved and refined from single crystal diffraction data. ScPt 2 Si crystallizes with an 'inverse' MgCuAl 2 structure while Sc 5 Pt 9 Si 7 forms a variant of the Zr 2 Fe 12 P 7 type.

Sc4Pt7Si2 – An Intergrowth Structure of ScPtSi and ScPt Related Slabs

“…This is indicative for strong covalent Pt–Si bonding. Such ranges of Pt–Si distances also occur in the structures of ScPtSi (243–259 pm) 12, Sc 3 PtSi 3 (240–257 pm) 3 and ScPt 2 Si (243–247 pm) 4. In line with the high platinum content we observe manifold Pt–Pt interactions.…”

“…Sc 2 RuSi 2 2 crystallizes with the monoclinic Zr 2 CoSi 2 structure and the silicides Sc 3 T Si 3 ( T = Ru, Rh, Ir, Pt) 3 adopt a new structure type. Two platinum rich compounds were reported by Lorenz et al 4 in the Sc/Pt/Si ternary phase diagram, ScPt 2 Si and Sc 5 Pt 9 Si 7 crystallizing with variants of the MgCuAl 2 and the Zr 2 Fe 12 P 7 type.…”

From 3D to 2D: Structural, Spectroscopic and Theoretical Investigations of the Dimensionality Reduction in the [PtAl2]δ− Polyanions of the Isotypic MPtAl2 Series (M=Ca–Ba, Eu)

“…[9] In the Pearson database, [10] numerouso rthorhombic compounds with the general composition RTX 2 can be found. Due to the differences in the respective bonding situations, however,t hese compounds have to be considered isopointalr ather than isotypic.F or these 1-1-2r epresentatives the gallides( MTGa 2 ; M = Ca, Sc, Y, Gd-Lu; T = Ni, Pd, Pt, Au), [11][12][13][14][15][16][17][18][19] the indides (MTIn 2 ; M = Na,C a-Ba, Y, La-Nd, Eu-Dy,Y b; T = Ru, Rh, Ir,N i, Pd, Pt, Cu, Au [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] and Eu 1Àx Sr x PtIn 2 ), [39] the thallides (MTTl 2 ; M = Sr,E u; T = Pd, Pt), [40][41][42] the silicide ScPt 2 Si, [43] the stannides MTSn 2 (M = Ca, Eu, Yb; T = Rh, Ir,P d) [43][44][45][46][47][48] and the phosphide PdNi 2 P [44] have been reported. For aluminum finally, the representatives MTAl 2 (M = Sc, Y, La-Nd, Sm, Gd-Lu; T = Co, Ni, Cu, Pd, Pt) [49]…”

“…Due to the differences in the respective bonding situations, however, these compounds have to be considered isopointal rather than isotypic. For these 1‐1‐2 representatives the gallides ( MT Ga 2 ; M =Ca, Sc, Y, Gd–Lu; T =Ni, Pd, Pt, Au), the indides ( MT In 2 ; M =Na, Ca–Ba, Y, La–Nd, Eu–Dy, Yb; T =Ru, Rh, Ir, Ni, Pd, Pt, Cu, Au and Eu 1− x Sr x PtIn 2 ), the thallides ( MT Tl 2 ; M =Sr, Eu; T =Pd, Pt), the silicide ScPt 2 Si, the stannides MT Sn 2 ( M =Ca, Eu, Yb; T =Rh, Ir, Pd) and the phosphide PdNi 2 P have been reported. For aluminum finally, the representatives MT Al 2 ( M =Sc, Y, La–Nd, Sm, Gd–Lu; T =Co, Ni, Cu, Pd, Pt) have been prepared.…”

Magnesium and Cadmium in Covalently‐Bonded Lonsdaleite Networks: Synthesis, Structure, and Bonding of AETMg2 and SrTCd2 (AE = Ca, Sr; T = Pd, Ag, Pt, Au)

“…Yb 0.95 PtIn 2 is the first representative of this structure type that shows defects on the rare earth position. (ii) The silicide ScPt 2 Si10 crystallizes with an anti‐MgCuAl 2 type structure, similar to PdNi 2 P 11. The platinum atoms build up the three‐dimensional network of distorted tetrahedra.…”