A sandwich-type zinc complex from a rhodamine dye based ligand: a potential fluorescent chemosensor for acetate in human blood plasma and a molecular logic gate with INHIBIT function

Abstract

Zn-R1 exhibits reversible binding with acetate yielding different optical and fluorescence outputs on alternate addition of zinc and acetate ions.

Synthesis, Crystal Structure and Substituent Controlled Photoluminescence and Chemosensing Properties of a Series of 2,2′‐(Arylenedivinylene)bis‐8‐hydroxyquinolines

“…Further, the quenching constants for D1‐D4 towards Co 2+ were calculated as 3.92×10 6 M −1 , 8.66×10 5 M −1 , 4.50 ×10 5 M −1 and 6.85 ×10 5 M −1 using Stern‐Volmer plots. In all these cases, Stern‐Volmer plots bent upwards and showed non‐linear features (see Figures S46–S49, Supporting Information) suggesting that the fluorescence quenching is caused by a combination of dynamic and static quenching . The binding constants of D1‐D4 towards Co 2+ were calculated as 1.16×10 5 M −1 , 0.73×10 5 M −1 , 2.96×10 5 M −1 and 2.28×10 5 M −1 respectively using Benesi‐Hildebrand method, see Figures S50‐S53, Supporting Information.…”

Luminescent Conductive Columnar π-Gelators for Fe(II) Sensing and Bio-Imaging Applications

“…The quenching constant was calculated by nonlinear fitting of the Stern−Volmer (SV) plot, as shown in Table S9. 58 The nonlinear SV plot indicates that FL quenching is caused by both static and dynamic processes. To get more insight, timecorrelated single photon counting (TCSPC) studies were performed on ligand 1.3 in the presence and absence of Fe 2+ ion.…”

“…The detection limit for Fe 2+ was observed to be 8.95 ppb for 1.3 , which is lower than the permissible limit, as shown in Figure S16 and Table S9. The quenching constant was calculated by nonlinear fitting of the Stern–Volmer (SV) plot, as shown in Table S9 . The nonlinear SV plot indicates that FL quenching is caused by both static and dynamic processes.…”

Structure‐Property Correlation of C10‐(H)‐Arylated‐N‐(pyren‐1‐yl)‐picolinamide Regioisomers towards Cu2+ and Fe3+ Sensing

“…This result suggests that both static (host-guest complex is non fluorescent at the ground state) and dynamic quenching (excitation energy of host is decomposed by means of collision between host and guest) was involved in the quenching of R and 1 b with Cu 2 + . The relationship between the relative fluorescence intensity and metal cation concentration was fitted using exponential functions [56,57] and SÀ V quenching constants for R and 1 b in the presence of Cu 2 + were determined and are presented in Table 2. Furthermore, the stoichiometry of the complexation was examined through Job's plot and is shown in Figure S13.…”