Extended Data Fig. 1: Electron localization function (ELF) analysis of the CP2Rh plane in compound 2.
From: A neutral σ0π2 carbene enabling hydrogen activation via a σ-face pathway

a, Top view, showing minimal electron localization at the carbene carbon along the σ-orbital direction, consistent with a σ0 electronic configuration. b, Side view, revealing two symmetric regions of high ELF above and below the carbene carbon, indicative of a π2 electronic configuration.