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• W2951750733 abstract "Hexarhenium(III) complexes with terminal isothiocyanate ligands, {(n-C4H9)4N}4[Re6(μ3-S)8(NCS)6] (1) and (L)4[Re6(μ3-Se)8(NCS)6] (L+ = PPN+ (2a), (n-C4H9)4N+ (2b)), have been prepared by three different methods. Complex 1 was prepared by the reaction of {(n-C4H9)4N}4[Re6(μ3-S)8Cl6] with molten KSCN at 200 °C, while 2b was obtained by refluxing the chlorobenzene−DMF (2:1 v/v) solution of [Re6(μ3-Se)8(CH3CN)6](SbF6)2 and [(n-C4H9)4N]SCN. The [Re6(μ3-Se)8(NCS)6]4- anion was also obtained from a mixture of Cs2[Re6(μ3-Se)8Br4] and KSCN in C2H5OH by a mechanochemical activation at room temperature for 20 h and isolated as 2a. The X-ray structures of 1 and 2a·4DMF have been determined (1, C70H144N10S14Re6, monoclinic, space group P21/n (No. 14), a = 14.464(7) Å, b = 22.059(6) Å, c = 16.642(8) Å, β = 113.62(3)°, V = 4864(3) Å3, Z = 2; 2a·4DMF, C162H144N14O4P8S6Se8Re6, triclinic, space group P1̄ (No. 2), a = 15.263(2) Å, b = 16.429(2) Å, c = 17.111(3) Å, α = 84.07(1)°, β = 84.95(1)°, γ = 74.21(1)°, V = 4098.3(8) Å3, Z = 1). All the NCS- ligands in both complexes are coordinated to the metal center via nitrogen site with the Re−N distances in the range of 2.07−2.13 Å. The redox potentials of the reversible ReIII6/ReIII5ReIV process in acetonitrile are +0.84 and +0.70 V vs. Ag/AgCl for [Re6(μ3-S)8(NCS)6]4- and [Re6(μ3-Se)8(NCS)6]4-, respectively, which are the most positive among the known hexarhenium complexes with six terminal anionic ligands. The complexes show strong red luminescence with the emission maxima (λmax/nm), lifetimes (τem/μs), and quantum yields (φem) being 745 and 715, 10.4 and 11.8, and 0.091 and 0.15 for 1 and 2b, respectively, in acetonitrile. The data reasonably well fit in the energy-gap plots of other hexarhenium(III) complexes. The temperature dependence of the emission spectra and τem of 1 and {(n-C4H9)4N}4[Re6(μ3-S)8Cl6] are also reported." @default.
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• W2951750733 date "2003-07-17" @default.
• W2951750733 modified "2023-10-18" @default.
• W2951750733 title "Preparation, Structures, and Redox and Emission Characteristics of the Isothiocyanate Complexes of Hexarhenium(III) Clusters [Re₆(μ₃-E)₈(NCS)₆]^4- (E = S, Se)" @default.
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• W2951750733 doi "https://doi.org/10.1021/ic030030d" @default.
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