Category: 183994-94-7

Sindt, Ammon J. published the artcileGuest Inclusion Modulates Concentration and Persistence of Photogenerated Radicals in Assembled Triphenylamine Macrocycles, Category: bromides-buliding-blocks, the main research area is macrocycle self assembly crystal guest radicals.

Substituted triphenylamine (TPA) radical cations show great potential as oxidants and as spin-containing units in polymer magnets. Their properties can be further tuned by supramol. assembly. Here, we examine how the properties of photogenerated radical cations, intrinsic to TPA macrocycles, are altered upon their self-assembly into one-dimensional columns. These macrocycles consist of two TPAs and two methylene ureas, which drive the assembly into porous organic materials. Advantageously, upon activation the crystals can undergo guest exchange in a single-crystal-to-single-crystal transformation generating a series of isoskeletal host-guest complexes whose properties can be directly compared. Photoinduced electron transfer, initiated using 365 nm light-emitting diodes, affords radicals at room temperature as observed by ESR (EPR) spectroscopy. The line shape of the EPR spectra and the quantity of radicals can be modulated by both polarity and heavy atom inclusion of the encapsulated guest. These photogenerated radicals are persistent, with half-lives between 1 and 7 d and display no degradation upon radical decay. Re-irradiation of the samples can restore the radical concentration back to a similar maximum concentration, a feature that is reproducible over several cycles. EPR simulations of a representative spectrum indicate two species, one containing two N hyperfine interactions and an addnl. broad signal with no resolvable hyperfine interaction. Intriguingly, TPA analogs without bromine substitution also exhibit similar quantities of photogenerated radicals, suggesting that supramol. strategies can enable more flexibility in stable TPA radical structures. These studies will help guide the development of new photoactive materials.

Journal of the American Chemical Society published new progress about Crystal structure. 183994-94-7 belongs to class bromides-buliding-blocks, name is 4-(Bromomethyl)-N,N-diphenylaniline, and the molecular formula is C19H16BrN, Category: bromides-buliding-blocks.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Jeon, Soon-Ok published the artcileA blue organic emitting diode derived from new styrylamine type dopant materials, Application of 4-(Bromomethyl)-N,N-diphenylaniline, the main research area is blue organic emitting diode LED styrylamine derivative dopant.

The authors have designed and synthesized new dopant materials based on the styrylamine moiety, 4-[(1,2-diphenyl)-4′-(N,N-diphenyl-4-vinylbenzenamine)]biphenyl (4) and 4-[(1,2-diphenyl)-4′-(N,N-diphenyl-4-vinylbenzenamine)]terphenyl (8). Blue OLEDs were obtained from new styrylamine dopant materials and compared with those of blue dopant bis[4-(di-p-N,N-diphenylamino)styryl]stilbene (DSA-Ph) and diphenyl[4-(2-terphenyl vinyl)phenyl]amine (R-BD). The ITO/DNTPD/NPB/MADN:dopant/Alq3/Al-LiF device obtained from 4 shows blue EL spectrum at 469 nm and high efficiency 3.02 cd/A at 7 V 8 also shows blue EL spectrum around λmax = 468 nm, efficiency of 3.51 cd/A and a c.d. of 25.94 mA/cm2 (855.7 cd/m2) at 7 V.

Synthetic Metals published new progress about Electroluminescence. 183994-94-7 belongs to class bromides-buliding-blocks, name is 4-(Bromomethyl)-N,N-diphenylaniline, and the molecular formula is C19H16BrN, Application of 4-(Bromomethyl)-N,N-diphenylaniline.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Hossain, Muhammad Saddam published the artcileEffects of Self-Assembly on the Photogeneration of Radical Cations in Halogenated Triphenylamines, Recommanded Product: 4-(Bromomethyl)-N,N-diphenylaniline, the main research area is self Assembly photogeneration radical cation halogenated triphenylamines; crstal structure urea tethered TPA derivatives.

We investigate the effect of assembly on charge transfer, charge recombination, and the persistence of radical cations in halogen-substituted triphenylamine (TPA) dimers. A series of urea-tethered TPA derivatives, R-NH-CO-NH-R (R = X-p-C6H4-N(Ph)-p-C6H4-CH2-, X = H, Cl, Br, and I)(1X) are compared, which have one Ph group modified at the para position with a halogen. Ureas direct the assembly of these derivatives while halogen substituents influence the packing of the TPA units. These modifications affect the generation and persistence of TPA radical cations as monitored by ESR (EPR) spectroscopy. The formation and degradation pathways of the radical cations in solution and gas phase were probed by ion-mobility spectrometry mass spectrometry. In contrast, supramol. assembly enhanced the stability of these materials as well as the persistence of their photogenerated radical cations, which appear to undergo charge recombination without degradation Greater quantities of these radical cations are observed for the bromo and non-halogenated derivatives (1Br, 1H). Time-dependent d. functional theory (TD-DFT) calculations on single mols. and hydrogen-bonded dimers suggest the stability of TPA radical cations largely depends on initial photoinduced charge separation and electronic coupling between assembled TPA dimers. The latter was found to be about 7 times stronger in 1I than in 1Br dimers, which may explain faster charge recombination and shorter lifetimes of 1I radicals. Transient absorption (TA) spectroscopy and TD-DFT were able to identify the charged species for 1Br along with the kinetic traces and measured lifetime of ~80 ns. Fluorescence quenching studies are consistent with initial charge separation and subsequent charge transfer event between nearby TPAs. Future exploration will focus on the mobility and application of these TPA assemblies as hole transport materials.

Journal of Physical Chemistry C published new progress about Charge separation (photoinduced, electron hole pair). 183994-94-7 belongs to class bromides-buliding-blocks, name is 4-(Bromomethyl)-N,N-diphenylaniline, and the molecular formula is C19H16BrN, Recommanded Product: 4-(Bromomethyl)-N,N-diphenylaniline.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Li, Jian published the artcileMetal-free, visible-light photoredox catalysis: transformation of arylmethyl bromides to alcohols and aldehydes, Quality Control of 183994-94-7, the main research area is arylmethyl bromide Eosin Y catalyst photooxidation; aryl alc aldehyde preparation.

A mild, simple, and controllable metal-free photocatalytic system for the transformation of arylmethyl bromides to corresponding alcs. and aldehydes in high yields with visible-light irradiation was achieved. Eosin Y was found to be an efficient promoter for this oxidative dehalogenation reaction under photo irradiation conditions.

RSC Advances published new progress about Aryl aldehydes Role: SPN (Synthetic Preparation), PREP (Preparation). 183994-94-7 belongs to class bromides-buliding-blocks, name is 4-(Bromomethyl)-N,N-diphenylaniline, and the molecular formula is C19H16BrN, Quality Control of 183994-94-7.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Dubinina, Galyna G. published the artcilePhenylene Vinylene Platinum(II) Acetylides with Prodigious Two-Photon Absorption, Safety of 4-(Bromomethyl)-N,N-diphenylaniline, the main research area is platinum acetylide phenylenevinylene chromophore two photon absorption NLO property; crystal structure dinuclear platinum acetylide phenylenevinylene chromophore preparation; mol structure dinuclear platinum acetylide phenylenevinylene chromophore.

The linear and nonlinear optical properties of linear and cross-conjugated Pt(II) acetylide complexes that contain extended p-(phenylenevinylene) chromophores are reported. The complexes exhibit very high femtosecond two-photon absorption (2PA) cross section values (σ2 up to 10,000 GM), as measured by nonlinear transmission (NLT) and two-photon excited fluorescence (2PEF) methods. The large 2PA cross sections span a broad range of wavelengths, 570-810 nm, and they overlap with the triplet excited state absorption. Spectral coincidence of high cross section 2PA and triplet absorption is a key feature giving rise to efficient dual-mode optical power limiting (OPL).

Journal of the American Chemical Society published new progress about Chromophores. 183994-94-7 belongs to class bromides-buliding-blocks, name is 4-(Bromomethyl)-N,N-diphenylaniline, and the molecular formula is C19H16BrN, Safety of 4-(Bromomethyl)-N,N-diphenylaniline.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary