Главная – Журналы – Биологическое действие низкоинтенсивного лазерного излучения: пути регуляции растительного метаболизма. Ч. 2 2007 номер ...

Cs₂Re₆S₆Br₈ (trigonal, a = 10.001(5) Å , c = 14.676(5) Å ) exhibits the same structure as Cs₂Mo₆Cl₈Br₆ and Cs₂Mo₆Br₁₄ that were described in a non-centro- and centrosymmetric space groups, respectively. The structure has been refined in P31c space group from a single crystal of actual composition Cs_1.95(1)Re₆S_5.82(3)Br_8.19(3) close to the cesium-rich end of the solid solution Cs₂Re₆S₆Br₈ — CsRe₆S₅Br₉. The centrosymmetry is respected by almost all the atoms of the asymmetric unit, but it is clearly broken by significant differences in the S/Br statistical distribution of the disordered ? inner? ligands around the Re₆ cluster. Structural refinements from data collected at 100 K revealed that the Cs cation disorder is static. From the structure refinements, the stable isomers of the [Re₆S₆Br₂] and [Re₆S₅Br₃] cluster cores have been unambiguously determined.