15N NMR spectroscopy as a probe for the geometry of diazenido ligands |
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| Authors: | Jonathan R Dilworth Chi-Tat Kan Raymond L Richards Joan Mason Ian A Stenhouse |
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| Institution: | A.R.C. Unit of Nitrogen Fixation, University of Sussex, Brighton, BN1 9RQ Great Britain;The Open University, Milton Keynes, MK7 6AA Great Britain;PCMU, Harwell, Oxfordshire, OX11 ORE Great Britain |
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| Abstract: | A useful criterion of linear or bent geometry at Nα of diazenido (-NαNβR) ligands is afforded by 15N NMR. A very large downfield shift (ca. 350 ppm) of the Nα resonance is reported for the “doubly-bent” diazenido ligands in RhCl2(15NNC6H4R-4)(PPh3)2] (R = H or NO2) compared with the “singly-bent” diazenido ligands in trans-MX(15N2R1)(dppe)2] (M = Mo or W, X = Cl or Br, R1 = Et or COMe), ReCl2(15N2COC6H5)(C5H5N)(PPh3)2] and RuCl3(15NNC6H5)(PPh3)2]. |
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