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Solvent‐Induced and Temperature‐Promoted Aggregation of Bipyridine Platinum(II) Triangular Metallacycles and Their Near‐Infrared Emissive Behaviors
Ist Teil von
Chemistry : a European journal, 2018-08, Vol.24 (45), p.11611-11618
Ort / Verlag
Germany: Wiley Subscription Services, Inc
Erscheinungsjahr
2018
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
A series of bipyridine platinum(II) complexes with different sizes of triangular metallacycles and alkyl/oligoether chains has been synthesized and characterized. They are packed in a zig‐zag fashion with the formation of dimeric structures according to their X‐ray crystal structures. Different emission origins are observed due to the different sizes of the triangular ligands. Their morphologies could be tuned by the modification of the molecular structures with different metallacyclic alkynyl ligands and alkyl/oligoether chains and solvents. More interestingly, unusual electronic absorption changes and upfield shifts of the aromatic proton resonances are observed upon increasing the temperature, suggesting further aggregation of the architectures. Near‐infrared (NIR) emission is also realized through the tuning of the π–π stacking, Pt⋅⋅⋅Pt interactions, and the packing of planar metallacycles.
Triangle of light! A series of bipyridine platinum(II) complexes with different sizes of triangular metallacycles and alkyl/oligoether chains demonstrates that the emission origin is dependent on the size of triangular metallacycles. Their aggregation behaviors are induced by solvents and promoted by temperature. NIR emission is realized due to the formation of the strong π–π stacking and Pt⋅⋅⋅Pt interactions induced by the close packing of the planar metallacycle.