title: A unified ligand electronic parameter based on13C NMR spectroscopy of N-heterocyclic carbene complexes.
abstract: The properties and reactivities of transition metal complexes are rooted in the stereoelectronic properties of their ligands. While the bulk of a ligand can be easily evaluated and compared by the drawing of its Lewis structure, prediction on the electronic contributions is often less straightforward. Thus, several electronic parameters have been developed for the experimental evaluation of ligands throughout the years. This article accounts for the most recent one developed by the Huynh group, which employs13C NMR spectroscopy to determine ligand donor strengths using N-heterocyclic carbene complexes. This parameter not only proves to be safer, more convenient and accurate in comparison to existing methodologies, but it also provides, in certain cases, more intuitive and reliable results. Furthermore, it is currently the only one that allows the direct comparison of various Werner-type and organometallic ligands on a unified scale.
authors.affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore, Republic of Singapore. chmhhv@nus.edu.sg.
authors.forename: Qiaoqiao
authors.initials: Q
authors.lastname: Teng
authors.affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543 Singapore, Republic of Singapore. chmhhv@nus.edu.sg.
authors.forename: Han Vinh
authors.identifier: http://orcid.org/0000-0003-4460-6066
authors.initials: HV
authors.lastname: Huynh