“…The active sites are amenable to kinetic and spectroscopic characterization techniques, thereby providing opportunities for systematic investigation of the roles of the metal and the supporting ligand in the catalytic cycle. In this regard, advancement in spectroscopic techniques, such as solid-state dynamic nuclear polarization (DNP) nuclear magnetic resonance (NMR) − spectroscopy, X-ray absorption spectroscopy (XAS), − and periodic and cluster model calculations has played a pivotal role in the progress of SOMC. Recent advances in predictive modeling of various spectroscopic signatures in well-defined catalysts represents a synergy between these two areas and enables previously inaccessible molecular level characterization of the supported organometallic fragments. − Pioneering works from the groups of Marks, − Basset, − Copéret, − Gates, − Tilley, − Scott, − and others − have demonstrated effective tuning of the activity and selectivity of single-site catalysts through precursor engineering and control over support platforms, harnessing fundamental structural and mechanistic insights into catalytic species for chemical processes which include polymerization/oligomerization, metathesis, hydrogenolysis, hydrogenation, dehydrogenation, and hydroelementations (Si, B).…”