Noorjahan Begum
Jahangirnagar University
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Dalton Transactions | 2008
Md. Nazim Uddin; Noorjahan Begum; Mohammad R. Hassan; Graeme Hogarth; Shariff E. Kabir; Md. Arzu Miah; Ebbe Nordlander; Derek A. Tocher
The synthesis and reactivity of the thiophyne and furyne clusters [Ru3(CO)7(mu-dppm)(mu3-eta2-C4H2E)(mu-P(C4H3E)2)(mu-H)] (E = S, O) is reported. Addition of P(C4H3E)3 to [Ru3(CO)10(mu-dppm)] (1) at room temperature in the presence of Me3NO gives simple substitution products [Ru3(CO)9(mu-dppm)(P(C4H3E)3)] (E = S, 2; E = O, 3). Mild thermolysis in the presence of further Me3NO affords the thiophyne and furyne complexes [Ru3(CO)7(mu-dppm)(mu3-eta2-C4H2E)(mu-P(C4H3E)2)(mu-H)] (E = S, 4; E = O, 6) resulting from both carbon-hydrogen and carbon-phosphorus bond activation. In each the C4H2E (E = S, O) ligand donates 4-electrons to the cluster and the rings are tilted with respect to the mu-dppm and the phosphido-bridged open triruthenium unit. Heating 4 at 80 degrees C leads to the formation of the ring-opened cluster [Ru3(CO)5(mu-CO)(mu-dppm)(mu3-eta3-SC4H3)(mu-P(C4H3S)2)] (5) resulting from carbon-sulfur bond scission and carbon-hydrogen bond formation and containing a ring-opened mu3-eta3-1-thia-1,3-butadiene ligand. In contrast, a similar thermolysis of 3 affords the phosphinidene cluster [Ru3(CO)7(mu-dppm)(mu3-eta2-C4H2O)(mu3-P(C4H3O))] (7) resulting from a second phosphorus-carbon bond cleavage and (presumably) elimination of furan. Treatment of 4 and 6 with PPh3 affords the simple phosphine-substituted products [Ru3(CO)6(PPh3)(mu-dppm)(mu3-eta2-C4H2E)(mu-P(C4H3E)2)(mu-H)] (E = S, 8; E = O, 9). Both thiophyne and furyne clusters 4 and 6 readily react with hydrogen bromide to give [Ru3(CO)6Br(mu-Br)(mu-dppm)(mu3-eta2-eta1-C4H2E)(mu-P(C4H3E)2)(mu-H)] (E = S, 10; E = O, 11) containing both terminal and bridging bromides. Here the alkynes bind in a highly unsymmetrical manner with one carbon acting as a bridging alkylidene and the second as a terminally bonded Fisher carbene. As far as we are aware, this binding mode has only previously been noted in ynamine complexes or those with metals in different oxidation states. The crystal structures of seven of these new triruthenium clusters have been carried out, allowing a detailed analysis of the relative orientations of coordinated ligands.
Archive | 2009
Arun K. Raha; Shishir Ghosh; Md.M. Karim; Derek A. Tocher; Noorjahan Begum; Ayesha Sharmin; Edward Rosenberg; Shariff E. Kabir
Related Article: A.K.Raha, S.Ghosh, Md.M.Karim, D.A.Tocher, N.Begum, A.Sharmin, E.Rosenberg, S.E.Kabir|2008|J.Organomet.Chem.|693|3613|doi:10.1016/j.jorganchem.2008.08.032
Organometallics | 2009
Md. Nazim Uddin; M. Abdul Mottalib; Noorjahan Begum; Shishir Ghosh; Arun K. Raha; Daniel T. Haworth; Sergey V. Lindeman; Tasneem A. Siddiquee; Dennis W. Bennett; Graeme Hogarth; Ebbe Nordlander; Shariff E. Kabir
Organometallics | 2007
Noorjahan Begum; Uttam K. Das; Manzur Hassan; Graeme Hogarth; Shariff E. Kabir; Ebbe Nordlander; Mohammad A. Rahman; Derek A. Tocher
Journal of Organometallic Chemistry | 2008
Noorjahan Begum; Mohammad A. Rahman; Mohammad R. Hassan; Derek A. Tocher; Ebbe Nordlander; Graeme Hogarth; Shariff E. Kabir
Organometallics | 2008
Noorjahan Begum; Md. Iqbal Hyder; Mohammad R. Hassan; Shariff E. Kabir; Dennis W. Bennett; Daniel T. Haworth; Tasneem A. Siddiquee; Dalia Rokhsana; Ayesha Sharmin; Edward Rosenberg
Organometallics | 2005
Noorjahan Begum; Shariff E. Kabir; G. M. Golzar Hossain; A. F. M. Mahfuzur Rahman; Edward Rosenberg
Polyhedron | 2005
Noorjahan Begum; Amarash C. Ghosh; Shariff E. Kabir; Md. Arzu Miah; G. M. Golzar Hossain
Inorganic Chemistry | 2005
Noorjahan Begum; Iqbal Hyder; Shariff E. Kabir; G. M. Golzar Hossain; Ebbe Nordlander; Dalia Rokhsana; Edward Rosenberg
Journal of Organometallic Chemistry | 2004
Tahmina Akter; Noorjahan Begum; Daniel T. Haworth; Dennis W. Bennett; Shariff E. Kabir; Md. Arzu Miah; Nitai C. Sarker; Tasneem A. Siddiquee; Edward Rosenberg