Luminescent amphiphilic molecules undergoing self-assembly are of great interest for the development of new materials, sensors or bio-labels. In the last years, our group has reported soft structures formed by metal complexes able to aggregate in fibres, gels and mechanochromic materials. In particular square-planar platinum(II) complexes exhibit remarkable variation of the photoluminescence properties upon self-assembly. 
An appropriate design of the complex allows tuning both the emission properties and the morphology of the assemblies, and even small changes in molecular design can completely inhibit or enhance the formation of organized supramolecular architectures. Our investigations led to novel materials with unique properties and great potential for applications. For instance, the monitoring of the different emission properties, used as fingerprints for each of the assembled species, allowed an unprecedented real-time visualization of the evolving self-assemblies. Moreover, we have recently reported assemblies employed as very sensitive labels for the detection of toxins and drugs, and as a new class of emitters for electrochemiluminescence applications.
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