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Keywords:

  • cobalt;
  • dihydrogen;
  • hydride ligands;
  • mercury;
  • NMR spectroscopy
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Mercury for protection? Mercury protects the highly reactive 14-electron {Co(POCOP)} fragment in a Co–Hg–Co complex, but reaction with H2 gives a rare dihydrogen complex of cobalt, and a second H2 molecule is added at higher pressures and low temperature (see scheme).