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Solvent-Induced and Temperature-Promoted Aggregation of Bipyridine Platinum(II) Triangular Metallacycles and Their Near-Infrared Emissive Behaviors.

Research paper by Yeye Y Ai, Maggie M Ng, Eugene Yau-Hin EY Hong, Alan Kwun-Wa AK Chan, Zhang-Wen ZW Wei, Yongguang Y Li, Vivian Wing-Wah VW Yam

Indexed on: 01 Aug '18Published on: 01 Aug '18Published in: Chemistry - A European Journal



Abstract

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. © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.