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Title: X-ray diffraction structures of two isomeric decacarbonyltriosmium compounds of quinoxaline, [(μ-H)Os3(CO)10(μ-1, 8-η2-C8H5N2)] and [(μ-H)Os3(CO)10(μ-1, 2-η2- C8H5N2)]
Authors: Begum, Noorjahan
Das, Uttam K
Hossain, G M Golzar
Hyder, Md. Iqbal
Kabir, Shariff E
Issue Date: Oct-2005
Publisher: NISCAIR-CSIR, India
IPC Code: IPC Code: Int. Cl.7 C07D215/00; C07F15/00; G01N23/22
Abstract: Treatment of [Os3(Co)10(MeCN)2] with quinoxaline at room temperature results in the isolation of two isomeric clusters  [(μ-H)Os3(CO)10(μ-1, 8-η2-C8H5N2)]5 and [(μ-H)Os3(Co)10(μ-1, 2-η2- C8H5N2)]6 in 50 and 10% yields respectively. Compounds 5 and 6 have been characterized by spectroscopic data and single crystal X-ray diffraction studies. Compound 5 crystallizes in the triclinic space group P-1 with a= 7.895(2) Å, b = 9.187(2)Å, c = 16.741(3)Å, α= 75.494(12), β =88.60(2), γ = 66.57(2)o, Z = 2, V = 1074.8(4) Å3 and dcalc= 3.031 mg/m3; R1 = 0.0364, wR2 = 0.0870 for 2958 reflections with I> 2ϭ (I). Compound 6 crystallizes together with an entirely independent molecule of the previously reported hydridehydroxy compound [(μ-H)Os3(CO)10(μ-OH)] 7 in the monoclinic space group P21/n with a= 9.255(2) Å, b = 16.864(3) Å, c = 26.243(7) Å, α = 90, β = 91.36(2), γ = 90°, Z = 4, V = 4094.8(16) Å3 and dcalc = 3.135 mg/m3 ; R1=0.0410, wR2 = 0.0749 for 2958 reflections with I> 2ϭ (I). In 5, the quinoxaline ligand coordinates through the ring N(1) atom and the C(8) carbon atom of the carbocyclic ring, whereas in compound 6, the ligand coordinates through the ring N(1) atom and the C(2) carbon atom of the heterocyclic ring.
Page(s): 1988-1994
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections: IJC-A Vol.44A(10) [October 2005]

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