Highly emissive perylene diimide-based bowtie-shaped metallacycles

Metallacycles hold great promise for fluorescence-based sensing due to their synthetic advantages and unique physicochemical properties. However, it remains highly challenging to develop a versatile methodology for constructing highly emissive metallacycles with targeted functionalities and therefore soughtafter properties. Herein, we report a general strategy to construct a series of highly emissive perylene diimide-based metallacycles via the self-assembly of perylene diimide-based tetrapyridyl ligand with different dicarboxylic ligands featuring fixed angles and cis-Pt(PEt_(3))_(2)(OTf)_(2). Single crystal X-ray diffraction analyses verify the formation of bowtie-like metallacycles with two triangular cavities. Notably, the fluorescence quantum yields of most assemblies exceed 98%, amongst the highest values for metallacycles.Additionally, such metallacycles exhibit sensitive fluorescence responses toward picric acid with a detection limit of 2.8 × 10^(-6)mol/L. This study not only provides a rational strategy for preparing highly emissive bowtie-shaped metallacycles, but also sheds light on their usage in the detection of picric acid and associated compounds.

9,10-Bis(diphenylmethylene)-9,10-dihydroanthracene-based metal-organic assemblies with aggregation-induced emission for multiple sensing

Developing novel emissive supramolecular assemblies with elegant architectures and tunable perfor-mance remains highly desirable yet challenging.Herein,we report the design and synthesis of several 9.10-bis(diphenylmethylene)-9.10-dihydroanthracene-based metal organic assembles with aggregation-induced emission characteristics.Such assemblies feature intriguing thermochromic and mechanochromic properties,ie.,distinguishable fuorescence responses in terms of emission wavelength and intensity un-der variable temperatures and pressures.Moreover,these assemblies can serve as excellent fluorescent sensors for the detection of polysaccharide molecules.Due to the differentiated charge type and den-sity,the assembles display distinct sensing mechanisms toward different polysaccharide molecules.This study provides novel perspectives for the synthesis of buttrfly-like platinum(I)supramolecular coordi-nation complexes with multistimuli-responsiveness for polysaccharide sensing.which will facllitate the development of stimuli-responsive materials.