934811-58-2Relevant academic research and scientific papers
Cluster core controlled reactions of substitution of terminal bromide ligands by triphenylphosphine in octahedral rhenium chalcobromide complexes
Shestopalov, Michael A.,Mironov, Yuri V.,Brylev, Konstantin A.,Kozlova, Svetlana G.,Fedorov, Vladimir E.,Spies, Hartmut,Pietzsch, Hans-Juergen,Stephan, Holger,Geipel, Gerhard,Bernhard, Gerd
, p. 3714 - 3721 (2007)
Reactions of rhenium chalcobromides Cs4[{Re6(μ 3-S)8}Br6]·2H2O, Cs 3[{Re6(μ3-Se)8}Br 6]·2H2O, Cs3[{Re6(μ 3-Q)7(μ3-Br)}Br6]·H 2O (Q = S, Se), and K2[{Re6(μ3-S) 6(μ3-Br)2)Br6] with molten triphenylphosphine (PPh3) have resulted in a family of novel molecular hybrid inorganic-organic cluster compounds. Six octahedral rhenium cluster complexes containing PPh3 ligands with general formula [{Re6(μ3-Q)8-n(μ3-Br) n}(PPh3)4-nBrn+2] (Q = S, n = 0, 1, 2; Q = Se, n = 0, 1) have been synthesized and characterized by X-ray single-crystal diffraction and elemental analyses, 31P{1H} NMR, luminescent measurements, and quantum-chemical calculations. It was found that the number of terminal PPh3 ligands in the complexes is controlled by the composition and consequently by the charge of the cluster core {Re6Q8-nBrn}n+2. In crystal structures of the complexes with mixed chalcogen/bromine ligands in the cluster core all positions of a cube [Q8-nBrn] are ordered and occupied exclusively by Q or Br atoms. Luminescence characteristics of the compounds trans-[{Re6Q8}(PPh3) 4Br2] and fac-[{Re6Se7Br}(PPh 3)3Br3] (Q = S, Se) have been investigated in CH2Cl2 solution and the broad emission spectra in the range of 600-850 nm were observed.
