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Keywords:

  • complexes with nitrogen ligands;
  • complexes with oxygen ligands;
  • hydrogen bonds;
  • tungsten compounds
Thumbnail image of graphical abstract

A strong π acceptor and a strong π donor—NO and O ligands, respectively—coordinated cis to the same metal atom are present in the complex 1. The NO stretching frequency of the linear W[BOND]NO unit occurs at extremely low wavenumber (1433 cm−1). The red complex 1 forms by reduction of [WL(CO)2(NO)]+ to [WL(NO)(CO)(Me)] (L = heterocycle) followed by reaction with O2.