Anion-sensitive photophysics of luminescent trimetallic complexes of Fe(II), Ru(II), and Os(II) with polarized NH motifs

Paul, Abhijit; Bar, Manoranjan; Ahmed, Toushique; Baitalik, Sujoy

doi:10.1016/j.poly.2020.114772

Cited by 7 publications

(8 citation statements)

References 73 publications

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“…42,44,46 We also thoroughly investigated the ground-and excited-state photophysical and electrochemical behaviours of 4d and 5d metals {mainly Ru(II) and Os (II)}. 43,45,[47][48][49] After careful scrutiny of the structure and the absorption and emission spectral behaviors, we anticipated that one of our previously reported terpyridyl-imidazole based receptors, viz. 2-(4-[2,2′:6′,2″]terpyridin-4′-yl-phenyl)-1H-phenanthro [9,10-d] imidazole (tpy-HImzphen), might be a good choice to serve our need.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, luminescence properties and deciphering the role of a terpyridyl-imidazole based ligand in the dissimilar luminescence sensitization of ternary lanthanide(iii) tris-(β-diketonate) complexes

Ahmed,

Chakraborty,

Paul

et al. 2023

Dalton Trans.

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Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, luminescence properties and deciphering the role of a terpyridyl-imidazole based ligand in the dissimilar luminescence sensitization of ternary lanthanide(iii) tris-(β-diketonate) complexes

Ahmed,

Chakraborty,

Paul

et al. 2023

Dalton Trans.

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“…Very recently, we studied pH-induced switching behaviors of the ground and excited state photophysical and redox behaviors of two different types of triads, [(bpy) 2 Ru(d-HIm-t)M(t-HIm-d)Ru(bpy) 2 ] 6+ and [(bpy) 2 Os(d-HIm-t)M(t-HIm-d)Os(bpy) 2 ] 6+ (M = Ru II or Os II ) derived from tpy-Hbzim-dipy. , Among the four triads, the RuRuRu functions as an “on–off” and “off–on” emission switch, while the three remaining triads act as a successive “off–on” and “on–off” emission switch, depending upon the pH of the medium. Additionally, the rate of intercomponent energy transfer was tuned by varying the pH of the solution.…”

Section: Resultsmentioning

confidence: 99%

Anion and Temperature Responsive Molecular Switches Based on Trimetallic Complexes of Ru(II) and Os(II) That Demonstrate Advanced Boolean and Fuzzy Logic Functions

et al. 2022

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Anion- and temperature-induced alteration of the photoredox behaviors of our recently reported trimetallic complexes was carried out to fabricate potential molecular switches. The triads [(phen)2Ru(d-HIm-t)M(t-HIm-d)Ru(phen)2]6+ (phen = 1,10-phenanthroline, d-HIm-t = heterotopic bipyridine–terpyridne type bridging ligand, and M = RuII and OsII) possess two acidic imidazole NH protons that upon interaction with anions give rise to considerable changes in their photophysical and electrochemical behaviors. Red-shifts of the absorption and emission maximum and a decrease in the M3+/M2+ potential occur when the triads are treated with basic anions. In fact, the triads can function as triple-channel sensors for F–, AcO–, CN–, OH–, and H2PO4 – in acetonitrile and as selective probes for CN– and SCN– in water. The equilibrium constants for the receptor–anion interaction are on the order of 106 M–1, while the limit of detection was on the order of 10–9 M. Temperature plays a key role in the luminescence properties of the triads by adjusting the energy barrier between the emitting triplet metal-to-ligand charge transfer and non-emitting triplet metal-centered levels. A decrease in temperature leads to increases in the emission intensity and lifetime of the triads displaying the “on state”, whereas an increase in temperature leads to a decrease in their emission characteristics and thus indicates the “off state” and that the process is fully reversible. In essence, the triads could function as potential switches on the basis of the reversible change in their spectral and redox behaviors under the influence of anion, acid, and temperature. The most important outcome of this study is mimicking several advanced Boolean and fuzzy logic functions by utilizing the spectral response of the triads upon the action of said external stimuli.

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“…Further, Baitalik et al developed a trimetallic complex containing Fe(II) 50 , Ru(II) 51, and Os(II) 52 ( Figure 8 ) derived from a bipyridine-terpyridine heteroditopic type spanning ligand for sensing of selected anions in both organic and aqueous media [ 87 ]. All three triads acted as multichannel receptors for F − , CN − , H 2 PO 4 − , and CH 3 COO − in acetonitrile without much selectivity.…”

Section: Discussionmentioning

confidence: 99%

Development and Application of Ruthenium(II) and Iridium(III) Based Complexes for Anion Sensing

2023

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Improvements in the design of receptors for the detection and quantification of anions are desirable and ongoing in the field of anion chemistry, and remarkable progress has been made in this direction. In this regard, the development of luminescent chemosensors for sensing anions is an imperative and demanding sub-area in supramolecular chemistry. This decade, in particular, witnessed advancements in chemosensors based on ruthenium and iridium complexes for anion sensing by virtue of their modular synthesis and rich chemical and photophysical properties, such as visible excitation wavelength, high quantum efficiency, high luminescence intensity, long lifetimes of phosphorescence, and large Stokes shifts, etc. Thus, this review aims to summarize the recent advances in the development of ruthenium(II) and iridium(III)-based complexes for their application as luminescent chemosensors for anion sensing. In addition, the focus was devoted to designing aspects of polypyridyl complexes of these two transition metals with different recognition motifs, which upon interacting with different inorganic anions, produces desirable quantifiable outputs.

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Anion-sensitive photophysics of luminescent trimetallic complexes of Fe(II), Ru(II), and Os(II) with polarized NH motifs

Cited by 7 publications

References 73 publications

Synthesis, characterization, luminescence properties and deciphering the role of a terpyridyl-imidazole based ligand in the dissimilar luminescence sensitization of ternary lanthanide(iii) tris-(β-diketonate) complexes

Synthesis, characterization, luminescence properties and deciphering the role of a terpyridyl-imidazole based ligand in the dissimilar luminescence sensitization of ternary lanthanide(iii) tris-(β-diketonate) complexes

Anion and Temperature Responsive Molecular Switches Based on Trimetallic Complexes of Ru(II) and Os(II) That Demonstrate Advanced Boolean and Fuzzy Logic Functions

Development and Application of Ruthenium(II) and Iridium(III) Based Complexes for Anion Sensing

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