3 years ago

Optical Sensing of Anions via Supramolecular Recognition with Biimidazole Complexes

Optical Sensing of Anions via Supramolecular Recognition with Biimidazole Complexes
Sven Rau, Maximilian Fleischmann, Sebastian A. Rommel, Dieter Sorsche
Phosphorescent metal complexes with peripheral N-H donor functionalities have attracted great attention as potential molecular sensing units for anionic species lately. In this contribution we discuss the development and potential of anion recognition and sensing features of recent examples of luminescent 2,2′-biimidazole complexes of ruthenium(II), iridium(III), osmium(II) and cobalt(III). The general dependency of photophysical features in these complexes regarding the acid-base chemistry of the peripheral N-H functionalities will be outlined as a basic requirement for optical ion recognition. Systematic strategies for the tuning and specific improvement by synthetic means will be discussed regarding recent reports. With respect to their distinct photophysical features, different transition metals are considered individually to demonstrate particular trends regarding ligand modification within the respective groups. In summary, this review elucidates the current state-of-the-art and future potential of the versatile class of 2,2′-biimidazole based sensor chromophores. Due to their promising spectroscopic and luminescent properties transition metal compounds have come into focus for luminescent sensing applications in recent years In this contribution the development of the potential of the recognition and sensing features of a selection of luminescent complexes of ruthenium(II), iridium(III), osmium(II) and cobalt(III) is discussed.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201605782

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