Responsive ruthenium complex probe for phosphorescence and time-gated luminescence detection of bisulfite

Abstract

We report the design, synthesis, and characterization of a responsive Ru(ii) complex probe for background-free time-gated luminescence detection of bisulfite.

Achieving long lifetime of room-temperature phosphorescence via constructing vitrimer networks

“…2.5.1 NMR experiments. 1 H NMR and 13 C NMR spectra were recorded using a Bruker AVANCE III spectrometer with chemical shifts reported as ppm.…”

“…7 However, its implementation is more difficult than that of fluorescence emission due to inefficient intersystem crossing (ISC) from the lowest excited singlet state (S 1 ) to the triplet states (T n ), fast nonradiative transition from the lowest excited triplet state (T 1 ) to the ground state (S 0 ) and the sensitivity of T 1 to quenchers (e.g., oxygen). 8,9 For ISC processes, the conventional RTP materials normally rely on noble metals [10][11][12][13] such as iridium, platinum and palladium, making them resource-constrained, expensive and toxic, which necessitates the development of pure organic metalfree RTP materials with low cost and easy modification. In previous reports, several strategies, including crystallization, [14][15][16][17][18] embedding organic phosphors into a polymer matrix, 19 Haggregation, 20,21 supramolecular self-assembly 22 and modifying host-guest composition, 23 have been developed to achieve metal-free RTP emission.…”

Determination and Imaging of Small Biomolecules and Ions Using Ruthenium(II) Complex-Based Chemosensors

“…By virtue of their abundant photo-physical and chemical properties, hundreds of Ru(II) complexes have been designed and synthesized for the detection of various anions, such as fluoride (F − ) [ 73 – 76 ], acetate (CH 3 COO − ) [ 77 ], cyanide (CN − )[ 78 ], phosphate (H 2 PO 4 − ) [ 79 – 81 ], chloride (Cl − ) and bromide (Br − ). Similar to the design of other anion receptors [ 82 ], most Ru(II) complex-based chemosensors are designed using the following three response mechanisms, including (1) the binding of the Ru(II) complex’s recognition unit with anions via hydrogen bonding and deprotonation [ 83 ], electrostatic and Lewis acid–base interactions [ 84 ], (2) specific reactions of the Ru(II) complex’s recognition unit with anions [ 85 ] and (3) displacement of metal ions from heterobimetallic Ru(II) complex [ 86 ]. In the following section, the Ru(II) complex-based chemosensors for anions will be discussed according to their different response mechanisms.…”

“…In addition to aldehyde, nucleophilic addition between the azo (N = N) group and HSO 3 − has recently been exploited for the development of chemosensors for HSO 3 − detection (Fig. 8 A) [ 24 , 85 ]. Owing to the PeT from the Ru(II) center to the attached azo-2,4-dinitrobenzene (DNB), Ru(II) complex 11 (Ru-azo) exhibited weak emission in 25 mM PBS buffer of pH 7.4.…”

One-pot synthesis to prepare lignin/photoacid nanohybrids for multifunctional biosensors and photo-triggered singlet oxygen generation

“…19,20 Although various fluorescent probes [21][22][23][24][25][26][27][28][29][30] have been developed for bisulfite detection and live cell imaging recently, most of them require tedious synthetic routes, combined with dangerous and toxic chemicals, while some of them require the use of precious metals. 31,32 These factors introduce unnecessary safety risks and increase the costs.…”