This work demonstrates improved blue phosphorescence in platinum complexes through aryl isocyanides and silver ions, indicating useful enhancements in luminescent materials.
In this work, we describe blue-phosphorescent platinum acetylide complexes of the formula cis-[Pt(CN-Ar)₂(C≡C-2-py)₂] (3-5), where C≡C-2-py is 2-pyridylacetylide and CN-Ar is an aryl isocyanide with progressively increasing steric bulk. Treatment of these complexes with silver(I) tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (AgBArF₄) results in chelation of the Ag(I) ion by the two 2-pyridylacetylide ligands. Photophysical studies in solution and PMMA films, recorded at different concentrations, generalize the previous observation that coordination of Ag(I) improves the radiative rate constant and photoluminescence quantum yield (ΦPL), by more than 2-fold in each case, and demonstrate two key effects of the bulky aryl isocyanides. First, in the silver-free precursor complexes, the aryl isocyanide ligands bring about an enhancement in ΦPL when compared to alkyl isocyanide ligands. Furthermore, in the silver-bound complexes, steric bulk on the aryl isocyanides is an important factor for inhibiting aggregation in film samples, preserving deep-blue phosphorescence and promoting a further increase in ΦPL, maximizing at ΦPL = 0.22 with the most sterically crowded isocyanide.
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Dang et al. (2026) studied this question.
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