SEARCH Articles Figures Tables 1.3- pyrazine ligands Chemistry organometallics Excited singlet Excited triplet Ligand chemistry Ligands in Organometallic Chemistry Ligands organometallic chemistry Ligands organometallics Organometallic chemistry Organometallic ligands Singlet excitation Singlet ligand Singlet-triplet Singlet-triplet excitation Singlets and triplets Triplet excitation Triplet excition