Fig. 2: Examples of sigma and agostic complexes.
From: The continuum of carbon–hydrogen (C–H) activation mechanisms and terminology

A First methane sigma complex fully characterised in situ. B Agostic complex featuring two agostic interactions.
From: The continuum of carbon–hydrogen (C–H) activation mechanisms and terminology

A First methane sigma complex fully characterised in situ. B Agostic complex featuring two agostic interactions.