1 J WSn as a Solution State Predictor for Tungsten−Tin Solid State Bond Length in Sterically Crowded Tungstenocene Stannyl Complexes
A correlation between the tungsten tin solid state bond distance (r WSn) and the solution state one-bond scalar coupling of tungsten to tin (1 J WSn) is reported. This correlation was observed in hydrido- and chlorotungstenocene diorganostannyl chlorides (Cp2WXSnClR2, X = H (1), X = Cl (2)) with ste...
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Published in | Organometallics Vol. 24; no. 16; pp. 3897 - 3906 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
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American Chemical Society
01.08.2005
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Abstract | A correlation between the tungsten tin solid state bond distance (r WSn) and the solution state one-bond scalar coupling of tungsten to tin (1 J WSn) is reported. This correlation was observed in hydrido- and chlorotungstenocene diorganostannyl chlorides (Cp2WXSnClR2, X = H (1), X = Cl (2)) with sterically demanding organic substituents (R = t Bu (1a, 2a), Ph (1b, 2b)). The different steric demands of the organic substituents ( t Bu and Ph) force the complexes 1a and 1b (or 2a and 2b) to adopt at 190 K in the solid state different, single rotameric conformations. For 1a and 2a, the t Bu substituents occupy the equatorial wedge of the tungstenocene, whereas for 1b and 2b the Ph substituents are rotated to place the chlorine in the equatorial wedge. Variable-temperature multinuclear NMR and density functional theory calculations at the B3LYP/LANL2DZ level indicate the possibility of low-lying conformational isomers for complexes 1b. |
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AbstractList | A correlation between the tungsten tin solid state bond distance (r WSn) and the solution state one-bond scalar coupling of tungsten to tin (1 J WSn) is reported. This correlation was observed in hydrido- and chlorotungstenocene diorganostannyl chlorides (Cp2WXSnClR2, X = H (1), X = Cl (2)) with sterically demanding organic substituents (R = t Bu (1a, 2a), Ph (1b, 2b)). The different steric demands of the organic substituents ( t Bu and Ph) force the complexes 1a and 1b (or 2a and 2b) to adopt at 190 K in the solid state different, single rotameric conformations. For 1a and 2a, the t Bu substituents occupy the equatorial wedge of the tungstenocene, whereas for 1b and 2b the Ph substituents are rotated to place the chlorine in the equatorial wedge. Variable-temperature multinuclear NMR and density functional theory calculations at the B3LYP/LANL2DZ level indicate the possibility of low-lying conformational isomers for complexes 1b. |
Author | Nti-Addae, Kwame Rajbhandari, Presha Mobley, T. Andrew Vargas, Angel Gillis, Eric P Gandour, Rochelle Tomson, Neil Palchaudhuri, Rahul Zheng, Qi |
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Title | 1 J WSn as a Solution State Predictor for Tungsten−Tin Solid State Bond Length in Sterically Crowded Tungstenocene Stannyl Complexes |
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