Abstract
Organoplatinum (II) complexes are promising candidates for the construction of smart supramolecular materials due to their unique flat structures. This accompanied by intriguing luminescent properties, prompts the molecules to aggregate after external stimuli. Nevertheless, the utilization of photo-responsive subunits to modulate their assemble behaviors and functions are still rarely explored. In this work, azobenzene (azo)-appended tridentate platinum (II) complexes with different linkers have been designed and synthesized. The intermolecular hydrogen bonding, π-π stacking, and metal-metal interactions were finely controlled through the tiny alteration of the linkers, which was found to play a vital role in self-assembly, and photophysical and photoisomerization properties. Some of them exhibited dual emission bands originating from metal-perturbed triplet intraligand (3IL) and metal-metal to ligand charge transfer (3MMLCT) excited states due to the different intermolecular interactions. Based on this, the manipulation of switchable luminescence as well as the controllable morphologies have been realized by photoisomerization.
Highlights
Coordinated complexes of d8 transition metals with various π-conjugated ligands are prone to stack and form aggregates with fascinating luminescence characteristics (Zhao et al, 2011; Yam et al, 2015; Zhang et al, 2018a; Li et al, 2019; Li et al, 2020a)
The results demonstrated that both complexes 1 and 3 with double amide groups have a serious tendency to aggregate through hydrogen bonding, π-π, and metal-metal interactions
The different linkers endowed these complexes with discrepancies in self-assembly, and photophysical and photoisomerization properties because of the formation of intermolecular hydrogen bonding, π-π stacking, and metalmetal interactions
Summary
Coordinated complexes of d8 transition metals with various π-conjugated ligands are prone to stack and form aggregates with fascinating luminescence characteristics (Zhao et al, 2011; Yam et al, 2015; Zhang et al, 2018a; Li et al, 2019; Li et al, 2020a). In view of their sensitive and changeable photophysical behaviors, they are promising candidates for application in the fields of chemosensors and bio-imaging (Xiang et al, 2013; Zhang et al, 2018b; Li et al, 2020b; He et al, 2020). The dynamic control and regulation of the molecular aggregates is a vital strategy to construct smart luminescent materials (Xiao et al, 2020a; Xiao, et al, 2020b)
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