The twinned crystal structure of 1,3-phenylenedimethanaminium dibromide, C8H14Br2N2

C8H14Br2N2, monoclinic, I2/a (no. 15), a = 9.0331(9) Å, b = 13.4475(14) Å, c = 27.586(3) Å, β = 94.879(9)°, Z = 12, V = 3338.8(6) Å3, R gt (F) = 0.0582, wR ref = 0.0885, T = 290 K.

The twinned crystal structure of (4SR)-7-benzyl-2,4,8,8-tetramethyl-7,8-dihydroimidazo[5,1-c][1,2,4]triazine-3,6(2H,4H)-dione, C16H20N4O2

C16H20N4O2, triclinic, P1̅ (no. 2), a = 9.0959(5) Å, b = 9.1993(5) Å, c = 18.5825(9) Å, α = 100.534(4)°, β = 94.120(4)°, γ = 94.752(4)°, V = 1517.44(13) Å3, Z = 4, Rgt(F) = 0.0801, wRref(F2) = 0.2371, T = 100(1) K.

Crystal growth and twinned crystal structure of Sr2CaWO6

Single crystals of Sr2CaWO6 have been prepared by sintering at high temperature. Powder samples were compressed into rods and heated up to 1953 K. This seems a promising new route for further studies of the structure and physical properties of double perovskites. The structural model of Sr2CaWO6 includes a quantitative description of the twinning shown by the diffraction pattern that should be present in almost any single-crystal specimen for this type of compound.

The twinned crystal structure of diiodobis(triphenylphosphine)palladium(II) dichloromethane disolvate at 173 K

The structure of the title compound, [PdI2(C18H15P)2]·2CH2Cl2, has previously been reported by Debaerdemaeker, Kutoglu, Schmid & Weber [Acta Cryst. (1973), B29, 1283–1288] at room temperature. We report the structure determination of this compound from a twinned crystal at 173 (2) K. The Pd atom is located on a centre of inversion and has square-planar coordination geometry.