ChemInform Abstract: Cocrystallized Mixtures and Multiple Geometries: Syntheses, Structures, and NMR Spectroscopy of the Re6 Clusters (NMe4)4(Re6(Te8-nSen)(CN)6) ( n = 0-8).

✍ Scribed by Y. V. MIRONOV; J. A. CODY; T. E. ALBRECHT-SCHMITT; J. A. IBERS

• Publisher: John Wiley and Sons
• Year: 2010
• Weight: 35 KB
• Volume: 28
• Category: Article
• ISSN: 0931-7597
• DOI: 10.1002/chin.199716027

✦ Synopsis

Cocrystallized Mixtures and Multiple Geometries: Syntheses, Structures, and NMR Spectroscopy of the Re6 Clusters (NMe4)4(Re6(Te8-nSen)(CN)6) ( n = 0-8). -The title clusters with n = 0, 1, 4, 7 and 8 are prepared in 37-62% yield by reaction of Re6Te15 with NaCN and Se in the appropriate molar ratios at 600 • C and subsequent cation exchange with NMe4Br. Characterization by 77Se and 125Te NMR spectroscopy and single crystal XRD of the compounds (NMe4)4(Re6Te8(CN)6) and (NMe4)4(Re6Te4Se4(CN)6) ( both monoclinic, P21/n, Z = 2) and ( NMe4)4(Re6Se8(CN)6)•3.5 H2O ( P21/n, Z = 6) indicate the presence of mixtures of geometric isomers of the anions formed by cocrystallization. A typical anion consists of an Re6 octahedron with its eight faces capped by µ3-chalcogen atoms. Each Re has a terminal CN ligand. Idealized cubic symmetry is essentially found for these anions. -(MIRONOV, Y. V.;