In this perspective we introduce the basic photophysics of excited-state intramolecular proton transfer (ESIPT) chromophores, then state-of-the-art development ESIPT chromophores and their applications in chemosensors, biological imaging white-light emitting materials are summarized. Most based on properties, such as design fluorescent chemosensors by perturbation process upon interaction with analytes, use tags to study DNA-protein probing variation hydration, or employing large Stokes...

Triplet–triplet annihilation (TTA) is a promising upconversion approach due to its low excitation power density (solar light sufficient), high quantum yield, readily tunable excitation/emission wavelength and strong absorption of light. This review focuses on the reported TTA based examples, challenges that are facing developments design rationales for triplet sensitizers acceptors.

Triplet-triplet annihilation (TTA) based upconversions are attractive as a result of their readily tunable excitation/emission wavelength, low excitation power density, and high upconversion quantum yield. For TTA upconversion, triplet sensitizers acceptors combined to harvest the irradiation energy acquire emission at higher through triplet-triplet transfer (TTET) processes. Currently limited phosphorescent transition metal complexes, for which tuning UV-vis absorption T(1) excited state...

2-Thienyl and 2,6-bisthienyl BODIPY derivatives (BS-SS BS-DS) were prepared that show intense absorption (ε = 65000 M–1 cm–1 at 507 nm) a large Stokes shift (96 vs the small of typical (<15 nm). Control compounds with thienyl unit 8-position or phenyl substituents 2,6-positions (BS-1 9). BS-1 shows absorption/emission in blue-shifted range (12 Compound 9 red-shifted range, but (<30 is much smaller than for BS-SS BS-DS. DFT calculations propose shifts BS-DS are due to remarkable geometry...

A red-emitting BODIPY-based fluorescent-resonance-energy-transfer (FRET) molecular probe 1 for selective detection of cysteine and homocysteine was designed. The fluorescence OFF–ON switch is triggered by cleavage the 2,4-dinitrobenzensulfonyl (DNBS) unit from fluorophore thiols. FRET energy donor (λabs = 498 nm, λem 511 nm) a parent BODIPY moiety acceptor based on 4-hydroxylstyryl 568 586 nm). unique C–C linker between established using Suzuki cross-coupling reaction. polyether chain also...

Up, up, and away! The long-lived 3IL excited states of RuII polyimine complexes were found to be more efficient in sensitizing upconversion based on triplet–triplet annihilation (TTA) energy transfer (TTET) than the shorter-lived 3MLCT (see picture). Upconversion occurs with an anti-Stokes shift up 0.77 eV. Detailed facts importance specialist readers are published as "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by...

We have synthesized three new phenylethynylated carbazole boronic acid sensors, which were predicted to display novel d-PeT fluorescence transduction (PeT, photoinduced electron transfer; fluorophore as the donor of transfer, ET) by DFT/TDDFT calculations. The effect is characterized a lower background at acidic pH than neutral pH, in stark contrast normal a-PeT (fluorophore acceptor that shows strong and undesired pH. Our experimental results confirmed theoretical predictions was observed...

Ru(Phen)(bpy)2 (1) and its new derivatives (2–5) with pyrenyl or ethynylated pyrene phenyl units appended to the 3-position of phenanthroline (Phen) ligand were prepared these complexes generate long-lived room temperature phosphorescence in red near IR range (600–800 nm). The photophysical properties investigated by UV-Vis absorption, luminescence emission, transient absorption spectra DFT/TDDFT calculations. We found lifetime (τ)can be drastically extended modification (increased up...

Transition metal complexes of Ru(II), Pt(II) and Ir(III) with strong absorption visible light long-lived T1 excited states were summarized. A design rationale these complexes, i.e. direct metalation organic chromophore, was proposed. Alternatively an chromophore can be dangled on the peripheral moiety coordination center. In both cases intraligand triplet state (3IL) accessed. However, 3IL is usually emissive for former case it very often non-emissive latter case. Two methods used study...

An OFF-ON red-emitting phosphorescent thiol probe is designed by using the 3MLCT photophysics of Ru(II) complexes, i.e., with as electron donor. The non-luminescent because MLCT corrupted transfer from to an intramolecular sink (2,4-dinitrobenzenesulfonyl). Thiols cleave sink, and re-established. Phosphorescence at 598 nm was enhanced 90-fold, a 143 (5256 cm−1) Stokes shift 1.1 μs luminescent lifetime.

Background The relationship between ambient air pollution exposure and mortality of cardiovascular cerebrovascular diseases in human is controversial, there little information about how exposures to contribution the among Chinese. aim present study was examine whether ambient-air increases risk for disease. Methodology/Principal Findings We conducted a retrospective cohort humans association compound-air pollutants [particulate matter <10 µm aerodynamic diameter (PM10), sulfur dioxide (SO2)...

Two highly selective OFF–ON green emitting fluorescent thiol probes (1 and 2) with intense absorption in the visible spectrum (molar extinction coefficient ε is up to 73 800 M−1 cm−1 at 509 nm) based on dyads of BODIPY (as electron donor photo-induced transfer, i.e.PET) 2,4-dinitrobenzenesulfonyl (DNBS) acceptor PET process) were devised. The single crystal structures two determined. distance between (BODIPY fluorophore) probe 2 larger than that 1, as a result contrast ratio (or efficiency)...

Room-temperature long-lived near-IR phosphorescence of boron-dipyrromethene (BODIPY) was observed (λ(em) = 770 nm, Φ(P) 3.5 %, τ(P) 128.4 μs). Our molecular-design strategy is to attach Pt(II) coordination centers directly onto the BODIPY π-core using acetylide bonds, rather than on periphery core, thus maximizing heavy-atom effect Pt(II). In this case, intersystem crossing (ISC) facilitated and radiative decay T(1) excited state observed, that is, BODIPY. The complex shows strong absorption...

Pt(II) Schiff base complexes containing pyrene subunits were prepared using the chemistry-on-complex approach. This is first time that supramolecular photochemical approach has been used to tune photophysical properties of complexes, such as emission wavelength and lifetimes. The show intense absorption in visible region (ε = 13100 M−1 cm−1 at 534 nm) red phosphorescence room temperature. Notably, much longer triplet excited state lifetimes (τ 21.0 μs) observed, compared model 4.4 μs)....

Visible-light harvesting cyclometalated Ir(III) complexes were used as (1)O(2) sensitizers for the photooxidation of 1,5-dihydroxynaphthalene (DHN) and substantially improved capability was observed compared to conventional complex that show no visible light-harvesting capabilities.

A colorimetric and ratiometric fluorescent thiol probe was devised with diketopyrrolopyrrole (DPP) fluorophore. The gives absorption emission at 523 666 nm, respectively. In the presence of thiols, such as cysteine, band shifted to 479 540 Correspondingly, color solution changed from purple yellow, fluorescence red yellow. intensity nm enhanced by 140-fold. Stokes shift 1 (107 nm) is much larger than unsubstituted DPP fluorophore (56 nm). Mass spectral analysis demonstrated that besides...

We studied four cyclometallated Pt(II) complexes, in which the thiazo-coumarin ligands (Pt-2, Pt-3 and Pt-4) or phenylthiazo ligand (Pt-1) were directly cycloplatinated. Pt-2 shows intense absorption visible region but other complexes show blue-shifted absorption. Room temperature phosphorescence was observed for all emission wavelength is dependent on size of π-conjugation, not intramolecular charge transfer (ICT) feature C^N ligands. longer lifetime (τ = 20.3 μs) than (below 2.0 μs)....

&lt;b&gt;&lt;i&gt;Background:&lt;/i&gt;&lt;/b&gt; In China, both the levels and patterns of outdoor air pollution have altered dramatically with rapid economic development urbanization over past two decades. However, few studies investigated association respiratory mortality, especially in high range. &lt;b&gt;&lt;i&gt;Objective:&lt;/i&gt;&lt;/b&gt; We conducted a retrospective cohort study 9,941 residents aged ≥35 years old Shenyang, to examine between pollutants [particulate matter &lt;10...

Light out of darkness? Most sensitizers for triplet–triplet annihilation (TTA) upconversion are strongly phosphorescent. A new RuII–coumarin dyad, on the other hand, has a non-emissive 3IL excited state (ΦP=0.2 %) but shows good quantum yield (ΦUC=2.7 %, see picture, TTET=triplet–triplet energy transfer).

Room temperature (RT) phosphorescence is observed from a naphthalimide species for the first time in square-planar chromophore Pt(dbbpy)(C[triple bond]C-NI)(2), where NI = N-butyl-4-ethynylnaphthalimide and dbbpy 4,4'-di-tert-butyl-2,2'-bipyridine. The combination of static time-resolved absorption photoluminescence data uniformly consistent with triplet-state photophysics localized on an appended C[triple bond]C-NI unit following excitation into low-energy bands. This molecule features...

Abstract A library of new fluorescent molecular rotors (FMRs) for viscosity sensing was synthesized. The sensitivity the fluorescence emission toward solvent and polarity investigated by using UV/Vis absorption, spectra, theoretical calculations. For FMRs, red‐shifted emissions at 620 nm, Stokes shifts 170 up to 40‐fold enhancement upon increasing solvents were observed (cf. known FMRs with 491 shift 33 nm fivefold enhancement). By high but low polarity, example, polyethylene glycol...

A dbbpy platinum(II) bis(coumarin acetylide) complex (Pt-1, = 4,4'-di-tert-butyl-2,2'-bipyridine) was prepared. Pt-1 shows intense absorption in the visible region (λ(abs) 412 nm, ε 3.23 × 10(4) M(-1) cm(-1)) compared to model Pt(II) bis(phenylacetylide) (Pt-2, λ(abs) 424 8.8 10(3) cm(-1)). Room temperature phosphorescence observed for ((3)IL, τ(P) 2.52 μs, λ(em) 624 Φ(P) 2.6%) and emissive triplet excited state assigned as mainly intraligand ((3)IL), proved by 77 K steady emission,...

Abstract Cyclometalated iridium(III) complexes with intense absorption in the visible region ( ϵ = 70920 M –1 cm at 466 nm) were prepared by incorporating light‐harvesting coumarin into diimine ligand (for comparison: 7030 371 nm for model complex without ability). The feature long‐lived intraligand triplet excited states 3 IL, supported spin density analysis of state). At room temperature, lifetimes, τ T , are up to 75.5 μs, as determined nanosecond time‐resolved transient spectroscopy....