Quadrupling the PLQY of Tetraphenylethylene by Covalently Linking it with Isosteric Tetraarylaminoborane: A Potential Candidate for Multicolor Live Cell Imaging.

Applications of organic luminophores depend on their photoluminescence quantum yield (PLQY). Several strategies have been developed to improve the PLQY of organic solids, and one such method is aggregation-induced emission (AIE). Herein, we disclose a comprehensive study of two molecularly engineered covalently linked isosteric AIEgens, and .

Transforming delayed fluorescence into blue-shifted phosphorescence in aminoboranes oxygen-to-sulfur substitution on the donor amine.

Thermally activated delayed fluorescence (TADF) and room-temperature phosphorescence (RTP) materials are found in diverse applications, from optoelectronic devices to time-gated bioimaging. Recently, aminoboranes with donor-acceptor structures have been identified as promising candidates due to their inherent capacity to harvest the triplet excitons by their unique orbital configurations (El Sayed rule). This work reports the delayed luminescence behaviors of two aminoboranes, BNO and BNS, featuring phenoxazine (PXZ) or phenothiazine (PTZ) donors coupled with a dixylylborane acceptor.

Naphthalimide and Carbazole Based Mechanochromic Molecular Dyads and Triads for Selective Lysosome Imaging.

In this study, we report the design and development of a stable fluorescent probe that is selectively localized in the cytosol of Hela cells. We designed two probes, 1 and 2, with D-π-A (carbazole (Cbz)-vinyl-naphthalimide (NPI)) and A-π-D-π-A (NPI-vinyl-Cbz-vinyl-NPI) architecture, respectively. Probes 1 and 2 exhibit broad photoluminescence (PL) spectra ranging from green (550 nm) to far-red (800 nm) in solutions and aggregated states.

Towards White Light Emission Through Metal-to-Metal Charge Transfer (MMCT) Effect in Bi Activated CaYTiZrGaO (0≤m≤2) Garnets.

Herein, we report the high-temperature solid-state synthesis and intriguing optical features of Bi/Ln doped CaYTiGaO (CYT). The optical properties of CYT were fine-tuned by judiciously substituting Zr ions at Ti sites and Bi, Ln ions at Y sites. All these compounds are crystallized in a cubic crystal system with an Ia-3d (no.

Azobenzene-Tagged Photopeptides Exhibiting Excellent Selectivity and Light-Induced Cytotoxicity in MCF-7 Cells over HeLa and A549.

The precise regulation of proteasome activity has become a focal point in current research, particularly its implications in cancer treatment. Bortezomib is used for treating multiple myeloma and is found to be ineffective against solid tumors. A spatiotemporal control over the proteasome is one of the solutions to resolve these issues using external stimuli, such as light.

Regioisomers containing triarylboron-based motifs as multi-functional photoluminescent materials: from dual-mode delayed emission to pH-switchable room-temperature phosphorescence.

Triarylboron compounds have been established as promising candidates in optoelectronic applications. However, realizing multi-functional properties in triaryl boron-based materials remains challenging. Herein, we present two regioisomers, 1 and 2, designed judiciously by connecting a dimethylamino donor and a dimesitylboryl acceptor at 1,4 and 2,6-positions of the naphthalene spacer, respectively.

Polymorphism Dependent Cytotoxicity, Cellular Uptake, and Live Cell Imaging Studies on Napthalimide-Vinyl-Phenothiazine Conjugate.

Polymorphism-dependent cytotoxicity and cellular uptake of drug molecules have been studied for the past two decades. However, the visualization of polymorph-dependent cellular uptake and cytotoxicity using microscopy imaging techniques has not yet been reported. The luminescent polymorph is an ideal candidate to validate the above hypothesis.

Pyrrole C-B-N Fused Porphyrins: Molecular Structures and Opto-Electrochemical Studies.

Herein, we report the design, synthesis, structure, and electrochemical study of doubly C-B-N fused Ni(II) porphyrins (1-trans, 1-cis, 2-trans, and 2-cis). These compounds have been synthesized from AB type dipyridyl Ni(II) porphyrins (Ar=Ph for 1 a; Ar=CF for 2 a) via Lewis base-directed electrophilic aromatic borylation reactions. The solution state structures of these compounds have been established using H NMR, B NMR, H-H COSY, H-C HSQC, and F-C HSQC NMR techniques.

Shape and Phase-Controlled One-Pot Synthesis of Air Stable Cationic AgCdS Nanocrystals, Optoelectronic and Electrochemical Hydrogen Evolution Studies.

CdS-based materials are extensively studied for photocatalytic water splitting. By incorporating Ag into CdS nanomaterials, the catalyst's charge carrier dynamic can be tuned for photo-electrochemical devices. However, photo-corrosion and air-stability of the heterostructures limit the photocatalytic device's performance.

Chiral B-N AIEgens: Intense Blue Circularly Polarized Luminescence and Piezochromism.

We present a new class of blue circularly polarized luminescent emitters based on tetraarylaminoborane (TAAB) with considerable dissymmetry factor in the solid state. The chiral pendant 1-phenylethylamine in and imparts chirality to the core chromophore, resulting in circularly polarized luminescence signals ( = 0.8 × 10) with a quantum yield of 33% in the crystalline state.

Single Molecular Persistent Room-Temperature Phosphorescence and Circularly Polarized Luminescence from Binaphthol-Decorated Optically Innocent Cyclotriphosphazenes.

Circularly polarized luminescence (CPL) features of BINOL-decorated cyclotriphosphazenes (CPs) are reported for the first time. The luminescence dissymmetry factor (g ) of these compounds in chloroform solutions and polymethyl methacrylate (PMMA) thin films with wt 1 % doping concentrations are found to be 1.0×10 , and 2.

Molecular Persistent Room-Temperature Phosphorescence from Tetraarylaminoboranes.

Herein, we report the synthesis, molecular structure, and optical features of tetrarylaminoboranes (MesB-N(Ph)(CH)) and (MesB-N(Ph)(CH)). In the solution state, shows aggregation-induced emission enhancement and color switching, while displays emission color switching and aggregation-caused quenching. At 77 K, frozen solutions of show delayed fluorescence (DF) and phosphorescence, whereas display only DF.

Crystallization induced room-temperature phosphorescence and chiral photoluminescence properties of phosphoramides.

We report the design and synthesis of a series of room temperature phosphorescent phosphoramides TPTZPO, TPTZPS, and TPTZPSe with a donor (phenothiazine)-acceptor (P = X, X = O, S, and Se) architecture. All the compounds show structureless fluorescence with a nanosecond lifetime in dilute solutions. However, these compounds show dual fluorescence and room temperature phosphorescence (RTP) in the solid state.

Synthesis and Characterization of Far-Red Emissive Boron-Based Triads Showing Large Stokes Shifts: Optical, TRANES, and Electrochemical Studies.

Herein, we report the design and synthesis of far-red emissive boryl-thiophene-BODIPY triads . The π-conjugation length and electronic communication between borane and BODIPY moieties are tuned by judiciously varying the size of the oligothiophene spacer in these triads (, terthiophene; , quarterthiophene; and , pentathiophene). Conjugates showed intriguing triple emissions in the blue to far-red regions.

Effect of the Molecular Conformation on Excitation Energy Transfer in Conformationally Constrained Boryl-BODIPY Dyads.

We studied the dual emission characteristics of a series of boryl-BODIPYs (-) comprised of triarylborane (TAB) as an energy donor and BODIPY as an energy acceptor. The molecular conformations of dyads - were systematically tuned by judiciously changing the spacer that bridged the boryl and BODIPY moieties. Frontier molecular orbitals (FMOs) are localized in , , and with a twisted molecular conformation.

Design, Synthesis, and Temperature-Driven Molecular Conformation-Dependent Delayed Fluorescence Characteristics of Dianthrylboron-Based Donor-Acceptor Systems.

We report a simple and novel molecular design strategy to enhance rISC in boron-based donor-acceptor systems to achieve improved delayed fluorescence characteristics. Dianthrylboryl ((An)B)-based aryl aminoboranes (donor: phenothiazine) and (donor: N,N-diphenylamine) were synthesized by a simple one-pot procedure. The energy of the electronic excited states in and were modulated by varying the arylamine donor strength and electronic coupling between D and A moieties.

Molecular Conformational Effect on Optical Properties and Fluoride Induced Color Changes in Triarylborane-Vinylbithiophene-BODIPY Conjugates.

Three new triads [bis(mesityl)boryl (MesB)-vinylbithiophene-BODIPY] bearing zero (), two (), and four () methyl groups on the BODIPY core are synthesized, and their optical properties are reported. The vinyl linker between the thiophene rings in the spacer moiety improved the electronic communication between the boryl and BODIPY units. It displayed a bathochromic shift in the absorption and emission spectra compared to the MesB-bithiophene-BODIPY triad reported elsewhere.

Triarylborane-Appended Anils and Boranils: Solid-State Emission, Mechanofluorochromism, and Phosphorescence.

Herein, the design, synthesis, optical properties, and mechanofluorochromism characteristics of a series of conjugates having covalently linked triarylborane (TAB) and anil/boranil units (TAB-anil: 1 a-3 a and TAB-boranil: 1-3) are reported. The electronic interactions between TAB and anil/boranil in 1 a-3 a and 1-3 were fine-tuned by changing the boryl moiety's position on the phenyl spacer connecting the BMes (Mes=mesityl) and anil/boranil units. A boryl moiety at the meta position (1 a) of the phenyl spacer stabilizes the enolic form (E-OH), whereas a boryl moiety at the para position (2 a and 3 a) stabilizes the keto form (Z-NH) in the solid state.

Delayed Fluorescence, Room Temperature Phosphorescence, and Mechanofluorochromic Naphthalimides: Differential Imaging of Normoxia and Hypoxia Live Cancer Cells.

We study the effect of molecular conformation on the electronic coupling between the donor amines and acceptor 1,8-naphthalimide (NPI) in a series of D-A systems - (A = NPI; D = phenothiazine, phenoxazine, carbazole, diphenylamine, respectively, for , , , and ). Weakly coupled systems show dual emission in the solution state, while strongly coupled systems show single emission bands. The energy of transitions and photoluminescence (PL) quantum yield are sensitive to the molecular conformation and donor strength.

Effect of Branching on the Delayed Fluorescence and Phosphorescence of Simple Borylated Arylamines.

A donor-π-acceptor strategy is being well exploited in several fields in view of their robust optical properties. However, the impact of branching in quadrupolar [A-(π-D)] and octupolar [A-(π-D)] molecules in comparison to parent dipolar (A-π-D) molecules on the delayed fluorescence and phosphorescence properties is seldom explored. We have presented herein the distinct and contrasting optical properties of a tridurylborane core bearing -NH (-) and -NMe (-) donor moieties, wherein the number of donors is increased systematically.

Aggregation-Induced and Polymorphism-Dependent Thermally Activated Delayed Fluorescence (TADF) Characteristics of an Oligothiophene: Applications in Time-Dependent Live Cell Multicolour Imaging.

Typically, molecules with a twisted donor-acceptor (D-A) architecture have been exploited for constructing thermally activated delayed fluorescence (TADF) materials. Herein, we report the first example of a thiophene-based thermally activated delayed fluorescent molecule without a D-A architecture. Compound 1 (2,5-bis(2,2-di(thiophen-2-yl)vinyl)thiophene) is conformationally flexible and shows weak fluorescence in the solution state but displays bright TADFin both condensed and solid states.

Room temperature phosphorescent triarylborane functionalized iridium complexes.

We report a series of room temperature phosphorescent compounds 1-6 composed of triarylborane (TAB) and cyclometallated iridium complexes. The optical characteristics such as energy of transition and luminescence quantum yield of these compounds can be conveniently fine-tuned by judiciously varying the cyclometallating ligand and the spacer between boron and iridium centers. Compounds 1-6 exhibit bright phosphorescence with the emission color ranging from green to red under a N2 atmosphere.

Borylated perylenediimide: self-assembly, photophysics and sensing application.

Triarylboryl appended perylenediimide (PDI-TAB) is designed and synthesized. The incorporation of triarylboranes (TABs) decreases self-aggregation and increases the solubility of PDI-TAB in common organic solvents. Fluorescence emission colors ranging from red, yellow and green are realized by judiciously modulating the concentration of PDI-TAB in solution.

Renaissance of Organic Triboluminescent Materials.

Solid-state luminescence of organic dyes is an elusive frontier, and understanding and designing solid-state stimuli-responsive materials is not trivial. "Mechanoluminescence" (ML) or "triboluminescence" (TL), which is associated with fracture or force-initiated luminescence from a material, is currently attracting new interest. Fracturing the surfaces of organic crystals ordered in noncentrosymmetric space groups can electronically excite the surface and neighboring molecules through piezo- or pyroelectric effects, and this can result in luminescence when the molecules relax back to their ground states.