Bifunctional self-assembled nanoparticles with a platinated fluorophore core ultra-low radiative transition are developed, which can generate both singlet oxygen and the photothermal effect for synergistic photodynamic therapy tumor ablation.

C60-bodipy triads and tetrads based on the energy-funneling effect that show broadband absorption in visible region have been prepared as novel triplet photosensitizers. The new photosensitizers contain two or three different light-harvesting antennae associated with wavelengths, resulting a broad band (450-650 nm). panchromatic excitation energy harvested by bodipy moieties is funneled into spin converter (C60), thus ensuring intersystem crossing population of state. Nanosecond...

Reversible photoswitched triplet–triplet annihilation upconversion (TTA UC) was demonstrated with dithienylethene (DTE) derivatives as the photochromic units, 2,6-diiodoBodipy triplet photosensitizer, and perylene acceptor/emitter. The TTA UC is undisturbed by open-form DTE but can be switched OFF upon photoirradiation of mixture three components at 254 nm, i.e., closed-form DTE. Subsequent visible light irradiation restores UC. By studying competitive triplet-state energy-transfer processes...

Bodipy dimers in which the two different sub-units take an orthogonal orientation were prepared, show strong absorption of visible light, long-lived triplet excited states (140.9 μs) and high singlet oxygen (1O2) quantum yields (64%). The used for triplet–triplet annihilation upconversion (quantum yield is up to 3.7%).

Two Ru(II) polyimine complexes containing a boron-dipyrromethene (Bodipy) chromophore were prepared. The two are different in the linker which connects Bodipy part and coordination centre. core centre π-conjugation Ru-1, whereas Ru-2 is linked non-conjugated way to Ru(bpy)3[PF6]2 (Ru-3) was used as reference complex. Both Ru-1 show strong absorption visible region (ε = 65 200 M−1 cm−1 at 528 nm for ε 76 700 499 Ru-2). fluorescence of ligands almost completely quenched Ru-2. shows room...

Abstract “Chemistry‐on‐the‐complex” synthetic methods have allowed the selective addition of 1‐ethynylpyrene appendages to 3‐, 5‐, 3,8‐ and 5,6‐positions Ir III ‐coordinated 1,10‐phenanthroline via Sonogashira cross‐coupling. The resulting suite complexes has given rise first rationalization their absorption emission properties as a function number position pyrene moieties. Strong in visible region (e.g. 3,8‐substituted Ir‐3 : λ abs =481 nm, ϵ=52 400 m −1 cm ) long‐lived triplet excited...

A series of perylene derivatives are prepared as triplet energy acceptors for triplet–triplet annihilation (TTA) assisted upconversion. The aim is to optimize the levels T1 and S1 states acceptors, so that prerequisite TTA (2ET1 > ES1) can be better satisfied, eventually increase upconversion efficiency. Tuning excited realized either by attaching aryl groups (via single or triple carbon–carbon bonds), assembling a perylene-BODIPY dyad, in which components present complementary state levels....

2,6-diiodoBodipy-perylenebisimide (PBI) dyad and triad were prepared, with the iodoBodipy moiety as singlet/triplet energy donor PBI acceptor. IodoBodipy undergoes intersystem crossing (ISC), but is devoid of ISC, a competition intramolecular resonance transfer (RET) ISC diiodoBodipy established. The photophysical properties compounds studied steady-state femtosecond/nanosecond transient absorption emission spectroscopy. RET photoinduced electron (PET) confirmed. production triplet state...

Zn(II) tetraphenyltetrabenzoporphyrin (TPTBP) and the free base H2TPTBP were used as triplet photosensitizers for triplet–triplet annihilation (TTA) upconversion, to replace long-established precious metal complex such those containing Pd(II)–Pt(II) atoms.

The molecular structure design, photophysical properties and the application of broadband visible light-absorbing triplet photosensitizers are summarized.

A photoswitchable fluorescent triad based on two 9,10-diphenylanthracene (DPA) and one dithienylethene (DTE) moiety is prepared for photoswitching of triplet–triplet annihilation upconversion. The DPA DTE moieties in the were connected via Click reaction. unit was used as triplet energy acceptor upconverted fluorescence emitter. switched ON with open form [DTE-(o)] (upconversion quantum yield ΦUC = 1.2%). Upon UV irradiation, photocyclization DTE-(o) produces closed [DTE-(c)], a result off...

Bodipy is used for the preparation of Pt(II) bisacetylide complexes which show strong absorption visible light and long-lived triplet state. Room temperature (RT) near-IR phosphorescence was observed. The π-conjugation framework light-harvesting ligand connected to center by CC bond. were as photosensitizers triplet–triplet annihilation (TTA) upconversion.

Transition-metal complex triplet photosensitizers are versatile compounds that have been widely used in photocatalysis, photovoltaics, photodynamic therapy (PDT) and triplet–triplet annihilation (TTA) upconversion. The principal photophysical processes these applications the intermolecular energy transfer or electron transfer. One of major challenges facing is short triplet-state lifetime, which detrimental to above-mentioned processes. In order address this challenge, transition-metal...

Dithienylethene (DTE)-2,6-diiodoBodipy triads were prepared with the aim to photoswitch triplet excited state of 2,6-diiodoBodipy moiety. Bodipy was selected due its low T1 energy level avoid sensitized photocyclization DTE, which is very often encountered in DTE photoswitches, so that photochemistry and organic chromophore can be addressed independently. This first time covalently connected an photosensitizer. For triad DTE-o structure, selective photoexcitation into diiodoBodipy part did...

The iridium(III) cyclometalation of alkylated pyrene–benzimidazole ligands proceeds in an unprecedented manner. resultant complexes display remarkably enhanced photooxidation capabilities using 1,5-dihydroxynaphthalene as a substrate.

Bodipy–ferrocene dyads were prepared for reversible electrochemical switching of the singlet excited state (fluorescence), as well triplet states Bodipy.

A photoswitchable fluorescent triad based on dithienylethene and Bodipy was used as a triplet acceptor/emitter for reversible photoswitching of triplet-triplet-annihilation upconversion (with Pd(II) tetraphenyltetrabenzoporphyrin photosensitizer), which shows green/near IR emission changes with an energy difference 0.79 eV (Δλ = 268 nm).

To maximize both the activatable singlet oxygen (1O2) production and fluorescence of theranostic photodynamic (PDT) reagents, herein we propose a modularized molecular structural profile, i.e. intersystem crossing (ISC) functionalities were accomplished with different modules in dyad, thus enabling activated 1O2 yield (ΦΔ, PDT) (ΦF) to approach 100%. The PDT caged thiol-cleavable disulfide bond (-S-S-) linker an electron trap (2,4-dinitrobenzenesulfide, DNBS). This new profile is from that...

Thiol-activated triplet-triplet annihilation (TTA) upconversion was studied with two different approaches, i.e., 2,4-dinitrobenzenenesulfonyl (DNBS)-caged diiodoBodipy triplet photosensitizers (perylene as the acceptor/emitter of upconversion) and DNBS-caged Bodipy fluorophore (PdTPTBP photosensitizer, TPTBP = tetraphenyltetrabenzoporphyrin). The photophysical processes were steady-state UV-vis absorption spectroscopy, fluorescence electrochemical characterization, nanosecond transient...

A N^N Pt(II) complex, Pt-1, with two heteroleptic ligands was prepared, which is a rarely reported molecular structure. The different acetylide ligands, i.e., boron-dipyyromethane (BDP) and naphthalenediimide (NDI) chromophores, show strong absorption in the visible region. photophysical properties of complex were investigated by using steady-state femtosecond/nanosecond time-resolved optical spectroscopies, as well electrochemical characterization. Upon selective photoexcitation coordinated...

The photophysical processes of intramolecular "ping-pong" energy transfers in the iodinated reference dyad BDP-I2-Py, as well uniodinated BDP-Py and triad BDP-2Py, were studied. For a forward Förster resonance transfer (FRET) from perylene (Py) unit to diiodoBDP (τ = 7 ps) backward triplet (TTET, τ 3 ns) Py observed. BDP-2Py systems, FRET 5–8 photoinduced electron (PET) 1–1.5 observed acetonitrile. used acceptor emitter for triplet-triplet annihilation (TTA) upconversion with palladium...

A series of Ir(III) complexes, based on 1,10-phenanthroline featuring aryl acetylene chromophores, were prepared and investigated as triplet photosensitizers. The complexes synthesized by Sonogashira cross-coupling reactions using a "chemistry-on-the-complex" method. absorption properties luminescence lifetimes successfully tuned controlling the number type light-harvesting group. Intense UV/Vis was observed for with two groups at 3- 8-positions phenanthroline. asymmetric complex (with...