| Abstract [eng] |
Compounds [C6H5CH2(CH3)3N]2[SeBr6(Se2Br2)] (1), [C6H5CH2(CH3)3N]2 [TeBr6(Se2Br2)] (2) and [C6H5CH2(CH3)3N]2[TeBr6]·CH3CN (3) were prepared from elemental selenium, bromine and benzyltrimethylammonium bromide (1), and from elemental selenium, bromine, tellurium dioxide and benzyltrimethylammonium bromide (2, 3), respectively. The constitution of the compounds was confirmed by the chemical analysis and X-ray crystal structure determination. The cation and Se2Br2 molecule in compounds (1) and (2) are disordered. The crystals of (1) are trigonal, the space group R 3 (No. 148) with Z = 1 and a = 12.8161(15) Å, a = 41.644(17) °. The crystals of (2) are trigonal, the space group R 3 or R3 (No. 148 or 146, the values of statistics closer to R3) with Z = 1 and a = 12.9365(15) Å, a = 41.436(17) °. The crystal structure of 3 has been determined by the X-ray method and refined to R = 0.0596 and 0.0709 for 2768 and 3183 reflections, respectively. The crystals are monoclinic, space group I 2/a with Z = 4 and a = 15.114(3), b = 9.3244(19), c = 22.437(5) Å, b = 95.22(3) °. The [TeBr6]2– octahedron of 3 is centrosymmetric with Te(IV)–Br = 2.7101(8), 2.6788(8), 2.7084(10) Å and BrTe(IV)–Br = 89.44(3), 90.38(2), 91.00(2) °. The length of Se(IV)–Br bonds in 1 are 2.565(2) Å and the mean value of Te(IV)–Br bonds in 2 is 2.698(6) Å. |
