Amplified circularly polarized phosphorescence from co-assemblies of platinum(ii) complexes

Chemical Science
Gyurim ParkYoungmin You

Abstract

Molecules capable of producing zero-field circularly polarized phosphorescence (CPP) are highly valuable for chiroptoelectronic applications that rely on triplet exciton. However, the paucity of tractable molecular design rules for obtaining CPP emission has inhibited full utilization. We report amplification of CPP by the formation of helical co-assemblies consisting of achiral square planar cycloplatinated complexes and small fractions of homochiral cycloplatinated complexes. The latter has a unique Pfeiffer effect during the formation of superhelical co-assemblies, enabling versatile chiroptical control. Large dissymmetry factors in electronic absorption (gabs, 0.020) and phosphorescence emission (glum, 0.064) are observed from the co-assemblies. These values are two orders of magnitude improved relative to those of individual molecules. In addition, photoluminescence quantum yields (PLQY) also increase by a factor of ten. Our structural, photophysical, and quantum chemical investigations reveal that the chiroptical amplification is attributable to utilization of both the magnetically allowed electronic transition and asymmetric coupling of excitons. The strategy overcomes the trade-off between glum and PLQY which has freque...Continue Reading

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Citations

Aug 23, 2019·Chemical Communications : Chem Comm·Pablo ReineJuan M Cuerva
Dec 9, 2020·Inorganic Chemistry·Chattarika SukpattanacharoenDaniel Escudero

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Methods Mentioned

BETA
scanning electron microscopy
AFM
X-ray
circular dichroism
linear dichroism
phosphorescence

Software Mentioned

PtBox

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