Synthesis,Structure and Reactivity of Electron Deficient Triosmium Cluster Bearing 2,6-Dimethylbenzothiazolide Ligand |
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| Authors: | Shishir Ghosh Md Nazim Uddin Noorjahan Begum G M Golzar Hossain Kazi A Azam Shariff E Kabir |
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| Institution: | (1) Department of Chemistry, Jahangirnagar University, Savar, Dhaka, 1342, Bangladesh;(2) Department of Chemistry, Sher-e-Bangla Agricultural University, Savar, Dhaka, 1342, Bangladesh;(3) Department of Chemistry, Dhaka University, Savar, Dhaka, 1342, Bangladesh; |
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| Abstract: | Abstract Reaction of Os3(CO)10(NCMe)2] with 2,6-dimethylbenzothiazole at room temperature affords Os3(CO)10(μ-H){μ-η
2-C7H2NS(Me)2}] (1) in 45% yield. Decarbonylation of 1 in refluxing toluene furnishes the electron-deficient cluster Os3(CO)9(μ-H){μ
3-η
2-C7H2NS(Me)2}] (2) in almost quantitative yield. Treatment of 2 with PPh3 at 40 °C gives the addition product Os3(CO)9(PPh3)(μ-H){μ-η
2-C7H2NS(Me)2}] (3) in 85% in which the PPh3 ligand is coordinated to the rear osmium atom. A similar treatment of 2 with P(OMe)3 gives Os3(CO)9{P(OMe)3}(μ-H){μ-η
2-C7H2NS(Me)2}] (4) in 60% yield with P(OMe)3 ligand also coordinated to the rear metal. Compounds 3 and 4 differ by the disposition of the hydride ligands. In compound 4 both the hydride and the heterocyclic ligands simultaneously bridge the same metal–metal edge whereas they bridge different
metal–metal edges in 3. Compounds 1–4 have been characterized by a combination of elemental analysis, infrared, NMR and mass spectral data together with single
crystal X-ray diffraction studies for 3. Compound 3 crystallizes in the monoclinic space group P21/n with a = 9.2659(10), b = 23.643(2), c = 16.382(3) Å, β = 91.324(12)°, Z = 4 and V = 3,587.8(8) Å3. |
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