Anion recognition and sensing by transition-metal complexes with polarized N H recognition motifs

Abstract

1. Introduction 2. Ruthenium(II) complexesfor anion sensing 2.1 Pyrrole-based Ru(II) complexes as chemosensors 2.2 Imidazole-based Ru(II) complexes as chemosensors 2.3 Urea-based Ru(II) complexes as chemosensors 2.4 Sulfonamide-based Ru(II) complexes as chemosensors 3. Rhenium(I) complexesfor anion sensing 3.1 Amide-based Re(I) complexes as chemosensors 3.2 Thioamide-and thiourea-based Re(I) complexes as chemosensors 3.3 Sulfonamide-based Re(I) complexes as chemosensors 3.4 Acetylamino-and trifluoroacetylamino-based Re(I) complexes as chemosensors 3.5 Catecholamide-based Re(I) complexes as chemosensors 4. Iridium(III) complexes for anion sensing 4.1 Thiourea-based Ir(III) complexes as chemosensors 4.2 Imidazole-based Ir(III) complexes as chemosensors 5. Concluding remarks Acknowledgements References

Sensitive water-soluble fluorescent chemosensor for chloride based on a bisquinolinium pyridine-dicarboxamide compound

“…Artificial biomimetic receptors containing amide and urea groups as anion recognition sites constitute one of the largest sub-groups in this field (Asthana et al, 2013;Chang et al, 2015;Ge et al, 2014;Kubik et al, 2005;Lin et al, 2015;Pinter et al, 2013;Warwick et al, 2013;White and Beer, 2013;White et al, 2014, Warwick et al, 2013. Chloride recognition with these systems is mostly achieved by hydrogen bonding interactions, which in many cases are not strong enough to overcome the high energy of hydration (ΔG = -340 kJ/mol) besides the fact that water molecules efficiently compete for the binding sites (Butler and Parker, 2013;Kubik, 2010).…”

Luminescent chemosensors by using cyclometalated iridium(iii) complexes and their applications

“…3,7,22–25 Some of those have focused on the use of a specific motif, 23,24 or considered only a limited range of analytes, 22,25 while some of them have been published for several years so that new examples has not been included. 3,7 In light of the recent expansion in the literature on cyclometalated iridium( iii ) chemosensors, this review seeks to highlight recent examples of the use of cyclometalated iridium( iii ) complexes as chemosensors for anions, cations and small molecules.…”

Selective and sensitive colorimetric detection of Hg(II) in aqueous solution by quinone-diimidazole ensemble with mimicking YES-OR-INHIBIT logic gate operation

“…The selection of R1 for the study is based on the facts that: i) imidazole N-atom is a well-known ligating atom in the formation of metal complexes [18,19], ii) recently few reports have also been published in which the second N-atom (N-H) of the imidazole ring coordinated to Hg(II) ion after deprotonation [20,21] and iii) any small electronic perturbation that occurs on these two Natoms as a result of coordination to the metal ion would alter the intramolecular charge transfer (ICT) transition, that exists between the N-atoms and the electron deficient quinone moiety [22], significantly and consequently impart striking colour change that can be seen visually. Further, in the absence of d-d transitions in Hg(II) complexes, the colour of them is mainly due to intra ligand charge transfer and/or metal-to-ligand charge transfer transitions, for which this type of ligands will serve the purpose.…”