4.6 Article

Terminal Au-N and Au-O Units in Organometallic Frames

Journal

CHEMISTRY-A EUROPEAN JOURNAL
Volume -, Issue -, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202203181

Keywords

inverted ligand field; nitrene; organogold; oxyl; radicals

Funding

  1. Spanish MICIU/FEDER [PID2021-122869NB-I00, PGC2018-093863-B-C21]
  2. Gobierno de Aragon [E17_20R]
  3. Structures of Excellence Maria de Maeztu program [MDM-2017-0767]
  4. Spanish MICCIN [RYC-2017-22853]
  5. Spanish MECD [FPU15/03940]

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This study discovered chemical species with Au-N and Au-O units and trapped them within a suitable organometallic frame. These compounds were experimentally detected and showed the characteristics of high-energy ions, making them of significant research value.
Since gold is located well beyond the oxo wall, chemical species with terminal Au-N and Au-O units are extremely rare and limited to low coordination numbers. We report here that these unusual units can be trapped within a suitable organometallic frame. Thus, the terminal auronitrene and auroxyl derivatives [(CF3)(3)AuN](-) and [(CF3)(3)AuO](-) were identified as local minima by calculation. These open-shell, high-energy ions were experimentally detected by tandem mass spectrometry (MS2): They respectively arise by N-2 or NO2 dissociation from the corresponding precursor species [(CF3)(3)Au(N-3)](-) and [(CF3)(3)Au(ONO2)](-) in the gas phase. Together with the known fluoride derivative [(CF3)(3)AuF](-), they form an interesting series of isoleptic and alloelectronic complexes of the highly acidic organogold(iii) moiety (CF3)(3)Au with singly charged anions X- of the most electronegative elements (X=F, O, N). Ligand-field inversion in all these [(CF3)(3)AuX](-) species results in the localization of unpaired electrons at the N and O atoms.

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