Dual-Emissive Rectangular Supramolecular Pt(II)-p-Biphenyl with 4,4′-Bipyridine Derivative Metallacycles: Stepwise Synthesis and Photophysical Properties

Mixed-ligand tetranuclear supramolecular coordination complexes (SCCs) of Pt(II)-p-biphenyl and bridging ligands derivatives of 4,4 '-bypiridine (8)-(10), were synthesized and characterized. The SCCs were synthesized stepwise, starting from the Pt-p-biphenyl -Pt core. The crystal structure of complex {[Pt(2,2 '-bpy)]4(mu-bph)2(mu-(4,4 '-bpy)2}{PF6}4 (2,2 '-bpy = 2,2 '-bipyridine, bph = p-biphenyl and 4,4 '-bpy = 4,4 ' bipyridine), was determined using single-crystal diffraction methods. The emission profile of the tetranuclear complexes (8)-(10) was influenced by the length of the bridging ligands and was found to depend on solvent polarity. Dual-emission patterns in methanol-water mixtures were observed only in the cases of complexes (9) and (10), attributed to aggregation-induced emission phenomena.

Automated summary

Mixed-ligand tetranuclear supramolecular coordination complexes of Pt(II)-p-biphenyl and bridging ligands derivatives were synthesized and characterized. The crystal structure of one complex was determined using single-crystal diffraction methods. The emission profiles of the tetranuclear complexes were influenced by the length of the bridging ligands and solvent polarity.