**9. Conclusions**

The present chapter covers a majority of luminescent Ru(II)-polypyridyl based chemosensors for the selective recognition of biorelevant metal ions such as Cu2+ and Fe2+/Fe3+ ions. The sensing behavior of different chemosensors varying from mono- to di-nuclear Ru(II)-polypyridyl complexes has been considered and discussed at a length. The applications encompass many fields including environmental, biological, analytical and medicinal domains. This field of luminescence sensing is quite prosperous and still emerging. Taking advantage of already known ligands topology exploiting their selective binding properties towards a particular metal ion, several chemosensors are developed. The design, detection, mechanisms and applications for different sensors presented in this chapter create huge opportunities for the development of future chemosensors.
