Building stable centromeres Each of our chromosomes has a single centromere, seen as constriction during cell division, which is required for accurate chromosome segregation to daughter cells. Falk et al. show that the special histone protein known CENP-A, forms part nucleosomes at centromeres, makes chromatin these constrictions very and long-lived. This stability conferred by protein-binding partner, CENP-C, recruited centromere CENP-A histone. Binding CENP-C CENP-A–containing alters...

Developing Type-I core/shell quantum dots is of great importance toward fabricating stable and sustainable photocatalysts. However, the application systems has been limited due to strongly confined photogenerated charges by energy barrier originating from wide-bandgap shell material. In this project, we found that through decoration Au satellite-type domains on surface CdS/ZnS dots, such an can be effectively overcome over 400-fold enhancement photocatalytic H2 evolution rate was achieved...

Triplet–triplet annihilation (TTA) enables photon upconversion by combining two lower-energy triplet excitons to produce a higher-energy singlet exciton. This mechanism enhances light-harvesting efficiency for solar energy conversion and the use of photons in bioimaging photoredox catalysis applications. The magnetic modulation such high-energy presents an exciting opportunity develop molecular quantum information technologies. While spin dynamics exciton pairs are sensitive external fields,...

Two amphiphilic corroles—5,10,15-tris(3-carboxyphenyl)corrole (H3[mTCPC]) and 5,10,15-tris(4-carboxyphenyl)corrole (H3[pTCPC])—and their gold complexes have been synthesized, photophysical properties photovoltaic behavior investigated. Like other nonpolar corroles, Au[mTCPC] Au[pTCPC] were both found to exhibit room temperature phosphorescence in deoxygenated solutions with quantum yields of ∼0.3% triplet lifetimes ∼75 μs. Both compounds exhibited significant activity as dyes photodynamic...

One key factor that affects the reaction yield and selectivity of nanoparticle-catalyzed photochemical reactions is type hole scavengers. In this work, we examine effect scavengers in photoreduction nitrobenzene catalyzed by cadmium sulfide quantum dots. We discover can determine reduction pathway as well final product. Specifically, when methanol solvent sole scavenger, or it used conjunction with ascorbic acid, ammonium formate, mercaptopropionic sodium borohydride, follows a direct...

Photogenerated spin-correlated radical pairs (SCRPs) in electron donor–bridge–acceptor (D–B–A) molecules can act as molecular qubits and inherently spin qubit pairs. SCRPs take singlet triplet states, comprising the quantum superposition state. Their synthetic accessibility well-defined structures, together with their ability to be prepared an initially pure, entangled state optical addressability, make them one of promising avenues for advancing information science. Coherence between two...

Abstract Consecutive photoinduced electron transfer (conPET) processes accumulate the energies of two photons to overcome thermodynamic limit traditional photoredox catalysis. However, excitation wavelength conPET systems mainly focused on short visible light, leading photodamage and incompatibility with large-scale reactions. Herein, we report triggered by near-infrared (NIR) red light. Specifically, a blue-absorbing photocatalyst, perylene diimide (PDI) is sensitized palladium-based...

Spin chemistry of photogenerated spin-correlated radical pairs (SCRPs) offers a practical approach to control chemical reactions and molecular emissions by using weak magnetic fields. This capability harness field effects (MFEs) paves the way for developing SCRPs-based qubits. Here, we introduce new series donor-chiral bridge-acceptor (D-χ-A) molecules that demonstrate significant MFEs on fluorescence intensity lifetime in solution at room temperature─critical quantum sensing. By precisely...

Organic molecules and quantum dots (QDs) have both shown promise as materials that can host bits (qubits). This is in part because of their synthetic tunability. The current work employs a combination to demonstrate series tunable dot–organic molecule conjugates photogenerated spin-based qubit pairs (SQPs) sensitize molecular triplet states. pairs, composed spin-correlated radical pair (SCRP), are particularly intriguing since they be initialized well-defined, nonthermally populated,...

Abstract Modulation of water exchange in lanthanide(III)–DOTA type complexes has drawn considerable attention over the past two decades, particularly because their application as contrast agents for magnetic resonance imaging. LnDOTA–tetraamide display unusually slow kinetics and this chemical property offers an opportunity to use these a new agent based upon saturation transfer (CEST) mechanism. Six DOTA–tetraamide ligands having side‐chain amide arms with varying hydrophobicity polarity...

Charge recombination to the electronic ground state typically occurs nonradiatively. We report a rational design of donor–bridge–acceptor molecules that exhibit charge-transfer (CT) emission through conjugated bridges over distances up 24 Å. The is enhanced by intensity borrowing and extends into near-IR region. Efficient charge initial excited results in fluorescence. have established identity CT solvent dependence, sensitivity temperature, femtosecond transient absorption spectroscopy,...

Photon upconversion based on sensitized triplet-triplet annihilation (TTA) presents interest for such areas as photovoltaics and imaging. Usually energy is observed p-type delayed fluorescence from molecules whose triplet states are populated via transfer a suitable donor, followed by TTA. Magnetic field effects (MFE) in molecular crystals well known; however, there exist only few examples of MFE TTA solutions, all them limited to UV-emitting materials. Here we present TTA-mediated visible...

Control over generation and dynamics of excited electronic states is fundamental to their utilization in all areas technology. We present the first example multichromophoric systems which emissive triplet are generated via a pathway involving photoinduced electron transfer (ET), as opposed local intrachromophoric processes. In model dyads, PtP-Ph(n)-pRhB(+) (1-3, n = 1-3), comprising platinum(II) meso-tetraarylporphyrin (PtP) Rhodamine B piperazine derivative (pRhB(+)), linked by...

Localization and delocalization of electrons is a key concept in chemistry, one the important factors determining efficiency electron transport through organic conjugated molecules, which have potential to act as "molecular wires". This, turn, substantially influences efficiencies solar cells other molecular electronic devices. It also necessary understand energy landscape dynamics that govern capabilities one-dimensional chains so we can better define design principles for molecules their...

In this work, we synthesized chiral CsPbBr 3 nanoplatelets using anionic binaphthyl-based ligands. The showed a distinct circular dichroism signal due to the interaction between and ligands on their surface.

A recently developed instrument for time-resolved infrared detection following pulse radiolysis has been used to measure the ν(C≡N) IR band of radical anion a CN-substituted fluorene in tetrahydrofuran. Specific vibrational frequencies can exhibit distinct frequency shifts due ion pairing, which be explained framework Stark effect. Measurements ratio free ions and pairs different electrolyte concentrations allowed us obtain an association constant energy change pairing. This new method...

The inherent spin polarization present in photogenerated spin-correlated radical pairs makes them promising candidates for quantum computing and sensing applications. states of these systems can be probed manipulated with microwave pulses using electron paramagnetic resonance spectrometers. However, to date, there are no reports on magnetic resonance-based measurements hosted dots. In the current work, we prepare dye molecule–inorganic dot conjugates show that they produce spin-polarized...

Spin chemistry of photogenerated spin-correlated radical pairs (SCRPs) offers a practical approach to control chemical reactions and molecular emissions using weak magnetic fields. This capability harness field effects (MFEs) paves the way for developing SCRPs-based qubits. Here, we introduce new series donor-chiral bridge-acceptor (D-χ-A) molecules that demonstrate significant MFEs on fluorescence intensity lifetime in solution at room temperature – critical quantum sensing. By precisely...

The coordination geometry adopted by the lanthanide complexes of DOTA-tetraamides is a critical factor in determining their water exchange kinetics. Controlling kinetics DOTA-tetraamide complexes, and extension geometry, particular interest because potential application this class complex as PARACEST MRI contrast agents. To facilitate maximum CEST effect at lowest pre-saturation powers much slower are required than commonly observed with these types chelates. Complexes that adopt more slowly...

Ion pairing is a fundamental consideration in many areas of chemistry and has implications wide range sciences technologies that include batteries organic photovoltaics. Ions solution are known to inhabit multiple possible states, including free ions (FI), contact ion pairs (CIP), solvent-separated (SSIP). However, solutions radicals nonmetal electrolytes, it often difficult distinguish between these states. In the first part this work, we report evidence for formation SSIPs low-polarity...

Magnetic control of molecular emission holds the promise developing new magneto-optical technologies. Spin dynamics radical pairs can serve as a basis chemical reactions by weak magnetic fields (<1 T) orders magnitude smaller than thermal energy kBT at room temperature. Here we demonstrate recombination fluorescence, produced charge photogenerated pairs, in rigid donor-bridge-acceptor molecules excited with visible light. We tune field response range chemically modulating energies affecting...