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The stannide SrPt 1.833 ☐ 0.167 Sn 2  was synthesized from the elements in a sealed niobium tube in a high-frequency furnace. Its structure was determined by and refined on the basis of single crystal X-ray diffraction data at 300 and 90 K. The refinement of 1177/1169  F  2  values with 34/37 variables leads to residuals [I≥3σ(I)]  R  M =0.026 (375) and  R  S =0.075 (53)/ R  M =0.0211 (408) and  R  S =0.0503 (128) for the 300/90 K data sets, respectively. SrPt 1.833 ☐ 0.167 Sn 2  crystallizes with an orthorhombic (3+1)D structure with the supercentered superspace group  C   c   mme ( 0β0 ) s 00 [ β =1/3  b  * ,  a =655.25(15),  b =656.7(4),  c =2062.3(5) pm]. It is related to the tetragonal CaBe 2 Ge 2  type structure. The crystal chemistry is described and the structure solution is discussed based on (3+2)D–(3+1)D–3D group-subgroup relations in the Bärnighausen formalism.  119 Sn Mössbauer spectra at ambient temperature and 78 K revealed a single signal with isomer shifts of δ=1.78(1) and δ=1.83(1) mm s –1  with quadropole splitting of ΔE Q =0.71(1) and 0.86(1) mm s –1 ,  respectively reflecting the low-symmetric site symmetry of the tin atoms. SrPt 1.833 ☐ 0.167 Sn 2  was classified as a  Pauli -paramagnet by magnetic susceptibility measurements. Its specific heat capacity is  C   pm  =121.4(1) J mol –1 K –1  at 300 K.

Ordered vacancies in the commensurately modulated structure of SrPt 1.833 ☐ 0.167 Sn 2