Influences of proton on the deep blue phosphorescence of new N-heterocyclic carbene Ir(III) complexes: Trans effects on facial and meridional isomers
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The phosphorescence color of newly synthesized N-heterocyclic carbene Ir(III) complexes can be tuned reversibly under acidic and basic conditions, which are attributed to the protonation and deprotonation of a ligand. The peculiar emission natures of fac- and mer-isomers is caused by the ‘trans-effect’ between protonated pyridine and opponent moieties of the ligand.