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- W2100099223 abstract "Abstract Different temperature conditions in crystal growth of tin(II) bromide, SnBr 2 , lead to the formation of two modifications of the title compound. Applying a temperature gradient from 650 °C to room temperature along a silica glass ampoule, the stable room‐temperature modification, o‐SnBr 2 crystallizes in the orthorhombic space group Pnma (no. 62), with a = 839.08(4) pm, b = 423.54(2) pm, c = 1052.03(4) pm, and Z = 4. Changing the reaction conditions towards a decreased temperature gradient from 700 °C to 400 °C, a high‐temperature form h‐SnBr 2 crystallizes in the hexagonal space group P 6 3 / m (no. 176), with a = 1228.24(5) pm, c = 435.68(2) pm, and Z = 6. The trigonal coordination of Sn with three Br atoms and the resulting one‐dimensional chains of corner sharing units 1 ∞ [SnBrBr 2/2 ] can be assigned as common structural motif of both modifications. In o‐SnBr 2 pairs of these chains exhibit the motif of a hexagonal rod packing parallel to the crystallographic b axis. In h‐SnBr 2 the chains are rearranged, which results in a lower packing density and in a change in topology from 6 3 to 3 4 .6. Utilizing differential scanning calorimetry on o‐SnBr 2 endothermal processes at 224 °C and 226 °C were assigned as possible phase transition temperatures prior to the melting point at 227 °C, supported by temperature depending powder X‐ray diffraction data." @default.
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- W2100099223 date "2015-05-27" @default.
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- W2100099223 title "Two Modifications of Tin(II) Bromide" @default.
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- W2100099223 doi "https://doi.org/10.1002/zaac.201500108" @default.
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