Polymorphic Phosphorescence from Separable Aggregates with Unique Photophysical Properties

Platinum complexes aggregate into polymorphs with different intermolecular interactions leading to different photophysical properties. Strong intermolecular interactions stabilize the aggregate to such an extent that the polymorphs can be separated directly by column chromatography. Solid‐state structures as well as quantum‐chemical calculations confirmed the effect of the interactions on the photophysical properties.
The interactions causing the action: Square planar platinum complexes aggregate into polymorphs with different intermolecular interactions leading to unique photophysical properties. Strong intermolecular interactions stabilize the aggregate to such an extent that the polymorphs can be separated by column chromatography. Solid‐state structures, quantum chemical calculations, concentration‐dependent excitation–emission spectroscopy, and solid‐state emission spectroscopy help to rationalize and shed light on the nature of this phenomenon.