Organic materials for Li-ion battery application continue gaining attention due the virtue of low cost, environmental benignity, and so on. A new class electroactive organic material called polyimides is particularly important to extra stability exhibited at higher current rates. High-performance rechargeable lithium cathodes based on 3,4,9,10-perylenetetracarboxylicacid-dianhydride are prepared. The novel electrodes exhibit good rate capability improved cycling stability, which result from...

Core-twisted aromatics exhibit enhanced intersystem crossing upon photoexcitation when compared to their planar analogs.

With the objective of developing small molecule based probes for proteins, interactions polyhydroxyl-substituted squaraine dye (SQ) with bovine serum albumin (BSA) have been investigated by absorption, steady-state and time-resolved fluorescence, circular dichroism (CD), cyclic voltammetry (CV), 1H NMR, scanning electron, tapping mode atomic force microscopic techniques. Increase in addition BSA resulted increase absorbance fluorescence quantum yields (80-fold) SQ, along significant...

With the objective of developing small molecule based receptors for nucleosides and nucleotides, interactions a cyclic donor-acceptor conjugate 1 with adenosine, AMP, ADP, CTP, UTP, ITP, ATP, GTP have been investigated by absorption, steady-state, time-resolved fluorescence, voltammetry (CV), NMR, fluorescence indicator displacement techniques. Titration fluorescent indicator, 8-hydroxy-1,3,6-pyrene trisulfonate (HPTS), resulted in nearly complete quenching HPTS, along 25% hypochromicity its...

<italic>N</italic>,<italic>N</italic>′-diamino-3,4,9,10-perylenetetracarboxylic polyimide (PI) based materials show excellent electrochemical performance as cathodes for sodium-ion batteries and an all-organic sodium ion battery using this the cathode disodium terephthalate (NaTP) (pre-sodiated) anode is demonstrated.

We report the effect of steric factors a few squaraine dyes, bis(2,4,6-trihydroxyphenyl)squaraine (1), bis(3,5-dibromo-2,4,6-trihydroxyphenyl)squaraine (2), and bis(3,5-diiodo-2,4,6-trihydroxyphenyl) (3), on their binding with human (HSA) bovine (BSA) serum albumins employing photophysical, chiroptical, biophysical, microscopic techniques. These dyes interact very efficiently exhibit site selectivity, involving synergistic effects hydrophobic, hydrogen bonding, electrostatic interactions....

Abstract Organic rechargeable batteries gain huge scientific interest owing to the design flexibility and resource renewability of active materials. However, low reduction potentials still remain a challenge compete with inorganic cathodes. This study demonstrates simple efficient approach tune redox properties perylene diimides (PDIs) as high voltage cathodes for organic‐based sodium‐ion (SIBs). With appropriate electron‐withdrawing groups substituents on diimides, this shows remarkable...

Solvent-free crystal structure of N,N-bis(propylacetyl)-1,6,7,12-tetrabromoperylene-3,4:9,10-bis(dicarboximide), PDI-Br4, obtained by X-ray diffraction reveals the core-twisted perylene motif having π–π stacks at an interplanar separation 3.7 Å. Slip-stacked arrangement PDI units in PDI-Br4 arises due to presence bulky bromine atoms. Femtosecond pump–probe measurements monomeric toluene reveal ultrafast intersystem crossing (τISC < 110 fs) when excited 400 nm. Triplet quantum yield (ΦT) 19 ±...

Abstract Exciton interactions in molecular aggregates play a crucial role tailoring the optical behaviour of π‐conjugated materials. Though vital for optoelectronic applications, ideal Greek cross‐dipole ( α =90°) stacking chromophores remains elusive. We report novel cross (+) assembly 1,7‐dibromoperylene‐3,4,9,10‐tetracarboxylic tetrabutylester (PTE‐Br 2 ) which exhibits null exciton coupling mediated monomer‐like characteristics crystalline state. In contrast, nonzero X‐type =70.2°,...

A comprehensive understanding of the structure-property relationships in multichromophoric architectures has pushed limits for developing robust photosynthetic mimics and molecular photovoltaics. The elusive phenomenon null exciton splitting gathered immense attention recent years owing to occurrence unique chromophoric consequent emergent properties. Herein, we unveil hitherto unobserved coupling assisted highly efficient photoinduced symmetry-breaking charge separation (SB-CS) a Greek...

The generation of electron–hole radical pair at the active layer organic photovoltaics through symmetry-breaking charge separation (SB-CS) has a crucial role in enhancing open-circuit voltage (Voc) and thereby increasing power conversion efficiency. Since SB-CS materials achieve intramolecular with negligible energetic driving force decelerated recombination (CR) rate, been subjected to extensive experimental theoretical studies. This Focus Review assesses fundamentals photosynthetic...

We report a nonparallel stacked arrangement of donor–acceptor (D–A) pairs for prolonging the lifetime photoinduced charge-separated states. Hydrogen–hydrogen steric repulsion in naphthalimide-naphthalene (NIN) dyad destabilizes planar geometry between constituent units solution/ground state. Sterically imposed nonplanar allows access donor and acceptor stacks having triclinic space group crystalline Antiparallel trajectory excitons D–A can result lower probability geminate charge...

Achieving long-lived symmetry-broken charge-separated states in chromophoric assemblies is quintessential for enhanced performance of artificial photosynthetic mimics. However, the occurrence energy trap hinders exciton and charge transport across photovoltaic devices, diminishing power conversion efficiency. Herein, we demonstrate unprecedented excimer formation relaxed excited-state geometry bichromophoric systems impeding lifetime states. Core-annulated perylenediimide dimers (SC-SPDI2...

We report the room temperature phosphorescence upon iodination on a crystalline eumelanin monomer with shielded hydroxyl moieties, ethyl 5,6-dimethoxyindole-2-carboxylate (DMICE). Ultrafast intersystem crossing (ISC) is observed in iodinated (IDMICE) as well brominated (BDMICE) analogues of derivative solution. The triplet quantum yields (φ

We prepared novel cholesterol-appended squaraine dye 1 and model 2 investigated their aggregation behavior in solution thin films using photophysical, chiroptical, microscopic techniques. Investigations on the dependence of solvent composition (good/poor, CHCl3/CH3CN) demonstrated that forms two H-type chiral supramolecular assemblies with opposite chirality at different good/poor compositions. Model compound formed J-type achiral under similar conditions. The assembly observed lower...

The self-assembly of DNA dumbbell conjugates possessing hydrophobic perylenediimide (PDI) linkers separated by an eight-base pair A-tract has been investigated. Cryo-TEM images obtained from dilute solutions the in aqueous buffer containing 100 mM NaCl show presence structures corresponding to linear end-to-end assemblies 10−30 monomers. formation this size is consistent with analysis UV−vis and fluorescence spectra these for content PDI monomer dimer chromophores. Assembly dependent upon...

Charge on through: Perylenediimide chromophores incorporated into DNA hairpins serve as base-pair surrogates and form a zipperlike intercalated structure (see picture). Electron hopping was observed within the chromophore stacks upon one-electron reduction. Detailed facts of importance to specialist readers are published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted by authors. Please note: The publisher is responsible...

The structure and properties of hairpin-forming bis(oligonucleotide) conjugates possessing perylenediimide (PDI) chromophores as hairpin linkers have been investigated using a combination spectroscopic computational methods. These exist predominantly monomer hairpins at room temperature in the absence added salt head-to-head dimers presence >50 mM NaCl. dimer is consistent with results small-angle X-ray scattering aqueous solution molecular dynamics simulation. nonconjugated PDI water...

The paper presents quantum yield results for the [2+2] and 6-4 photodimerization of TT steps in several DNA structures, including hairpins where context dependence is determined, it develops a theoretical model that correctly describes trends dimerization with structure. conjugates considered include dT20, dA20dT20, three alkane-linked contain single step. modeling process based on CASSCF electronic structure calculations ethylene + ethylene, which show photoexcitation low-lying excited...

Quantum theory of atoms-in-molecules and Hirshfeld surface analyses indicated an increase in the extent (i) C-H···H-C; (ii) C-H···O, (iii) π-π interactions a decrease σ-π interaction, interplanar angle between vicinal pyrene units series acetylpyrene derivatives offering blue-green-orange emissive crystals.