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Halogen-Bonded Cocrystals for Tunable Phosphorescence Emission of Pt Complexes
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Noncovalent interactions, such as halogen bonding (HaB) and π-stacking, play a pivotal role in directing supramolecular assemblies and tuning photophysical properties. Herein, we report the synthesis, X-ray structural characterization, and photophysical properties of cocrystals and host:guest adducts formed by iodopentafluorobenzene (G) with three distinct Pt(II) complexes (1−3). The cocrystals exhibit a combination of short I···Pt halogen bonds and π-hole···Pt interactions in the solid state, highlighting the dual role of the Pt(II) center as a halogen bond acceptor and a π-stacking participant. Interestingly, an enhancement in emission intensity is observed for complexes 1·G and 2·G upon mixing of 1 or 2 with G in a chloroform solution, attributed to synergistic σ-hole···[dz2-PtII] interactions that reduce the flexibility of the square-planar complex and the double heavy atom effect. These results emphasize the potential of host:guest interactions as a strategy for enhancing luminescence efficiency and open new avenues for designing functional materials for sensing and optoelectronic applications.
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GARCÍA DEL AMO, Mar Inés, et al. Halogen-Bonded Cocrystals for Tunable Phosphorescence Emission of Pt Complexes. Inorganic Chemistry. 2023. Vol. 64, num. 22, pags. 10772-10779. ISSN 0020-1669. [consulted: 3 of August of 2026]. Available at: https://hdl.handle.net/2445/229509