Interested in the ability of computational methods to accurately describe the bonding of NHCs and related divalent carbon compounds in transition metal and main group complexes, we report in this context a computational assessment of the 1 JC-H coupling constant as a descriptor of the -donation capability. This study aims to enhance our understanding of its relevance and generality. To achieve this, we conducted a theoretical study on a substantial and diverse set of NHC and related divalent carbon compounds (Fig. ). For these compounds, various descriptors related to the -donation capability of the carbene were compared to identify agreements and discrepancies among them.