Treatment of N-heterocyclic carbene (NHC) ligated germylidenylphosphinidene MFluid-GeP(NHC) (where MFluid is a bulky hydrindacene substituent, and NHC is 1,3-diisopropyl-4,5-dimethyl-imidazolin-2-ylidene) with mesityl azide and 4-tertbutylphenyl azide afforded NHC coordinated formal germanimidoyl-phosphinidenes, which represent the first compounds bearing both Ge═N double bond and phosphinidene functionalities. Studies of the chemical properties revealed that the reactions preferred to occur at the Ge═N double bond, which underwent [2 + 2] cycloadditions with CO and ethyl isocyanate, and coordinated with coinage metals through the nitrogen atom.
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