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Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]

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https://read.qxmd.com/read/30762933/synthesis-and-applications-of-red-emissive-carbon-dots
#1
REVIEW
Jianying Wang, Yuhua Zhu, Lei Wang
Carbon dots (CDs), a new class of fluorescent carbon nanoparticles (less than 10 nm in size), have been widely applied in various fields, including sensors, bioimaging, catalysis, light-emitting devices (LEDs), and photoelectronic devices, owing to their unique properties such as low toxicity, bio-compatibility, high photostability, easy surface modification, and up-conversion fluorescence, over the past decades. Recently, multiple-color-emissive CDs, especially red-emissive CDs (RCDs), have drawn much attention owing to their unique advantages, like the ability to penetrate the animal bodies without the disturbance of strong tissue autofluorescence, multiple-color fluorescence displaying or sensing, and the capacity to be one essential component to obtain white LED (WLED)...
February 14, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30730097/organocatalytic-desymmetrization-reactions-for-the-synthesis-of-axially-chiral-compounds
#2
REVIEW
Nicola Di Iorio, Simone Crotti, Giorgio Bencivenni
The enantioselective synthesis of atropisomers is an emerging field, that in recent years reached fundamental results and put the bases for innovative applications. Organocatalysis is playing a central role in the realization of original synthesis for novel atropisomeric scaffolds. In this short review, we would like to highlight the results obtained by our group and others in the field of axially enantioselective desymmetrization reactions using organocatalysis as main strategy.
February 7, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30716206/plasmon-enhanced-fluorescence-resonance-energy-transfer
#3
REVIEW
Huan Zong, Xinxin Wang, Xijiao Mu, Jingang Wang, Mengtao Sun
In this review, we firstly introduce physical mechanism of fluorescence resonance energy transfer (FRET), the methods to measure FRET efficiency, and the applications of FRET. Secondly, we introduce the principle and applications of plasmon-enhanced fluorescence (PEF). Thirdly, we focused on the principle and applications of plasmon-enhanced FRET. This review can promote further understanding of FRET and PE-FRET.
February 4, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30707497/donor-acceptor-cyclopropanes-in-the-synthesis-of-carbocycles
#4
REVIEW
Olga A Ivanova, Igor V Trushkov
Donor-acceptor cyclopropanes not only participate in a broad range of ring openings with nucleophiles, electrophiles, radical and red-ox agents, but also are excellent substrates for various (3+n)-cycloaddition and (3+n)-annulation processes. Moreover, under treatment with Lewis acid donor-acceptor cyclopropanes can produce new ring systems via isomerization or cyclodimerization. Authors' contribution to the synthesis of diverse carbocycles from donor-acceptor cyclopropanes is summarized in this account.
February 1, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30698895/beyond-oled-efficient-quantum-dot-light-emitting-diodes-for-display-and-lighting-application
#5
REVIEW
Yizhe Sun, Yibin Jiang, Xiao Wei Sun, Shengdong Zhang, Shuming Chen
The unique features of solution-processed quantum dots (QDs) including emission tunability in the visible range, high-quality saturated color and outstanding intrinsic stability in environment are highly desired in various application fields. Especially, for the preparation of wide color gamut displays, QDs with high photoluminescence quantum yield are deemed as the optimal fluorescent emitter that has been utilized in the backlight for liquid crystal display. Nevertheless, the commercialization of electrically driven self-emissive quantum dot light-emitting diode (QLED) display is the ultimate target due to its merits of high contrast, slim configuration and compatibility with flexible substrate...
January 30, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30694022/combined-theoretical-and-experimental-studies-of-sodium-battery-materials
#6
REVIEW
Eriko Watanabe, Sai-Cheong Chung, Shin-Ichi Nishimura, Yuki Yamada, Masashi Okubo, Keitaro Sodeyama, Yoshitaka Tateyama, Atsuo Yamada
Owing to developments in theoretical chemistry and computer power, the combination of calculations and experiments is now standard practice in understanding and developing new materials for battery systems. Here, we briefly review our recent combined studies based on density functional theory and molecular dynamics calculations for electrode and electrolyte materials for sodium-ion batteries. These findings represent case studies of successful combinations of experimental and theoretical methods.
January 29, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30681292/metallated-macrocyclic-derivatives-as-a-hole-transporting-materials-for-perovskite-solar-cells
#7
REVIEW
Govind Reddy, Koteshwar Devulapally, Nanaji Islavath, Lingamallu Giribabu
Spiro-OMeTAD is widely used as thehole-transporting material (HTM) in perovskite solar cells (PSC), which extracts positive charges and protects the perovskite materials from metal electrode, setting a new world-record efficiency of more than 20 %. Spiro-OMeTAD layer engross moisture leading to the degradation of perovskite, and therefore, has poor air stability. It is also expensive therefore limiting scale-up, so macrocyclic metal complex derivatives (MMDs) could be a suitable replacement. Our review covers low-cost, high yield hydrophobic materials with minimal steps required for synthesis of efficient HTMs for planar/mesostructured PSCs...
January 25, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30681252/synthesis-of-%C3%AF-conjugated-benzocyclotrimers
#8
REVIEW
Changding Guo, Debin Xia, Yulin Yang, Xia Zuo
Polycyclic aromatic hydrocarbons (PAHs), especially three branchphene benzocyclotrimers represent a series of molecules with intriguing physical and chemical properties. Benzocyclotrimers are also important precursors to construct fullerenes and graphenes. In this article, we review the recent progress in the preparation methods of π-conjugated benzocyclotrimers. In particular, cyclotrimerization reactions to construct varying shaped and edged benzocyclotrimers are illustrated. Various typical characterization methods for these materials, such as variable-temperature 1 H-NMR, single crystal X-ray analysis, density functional theory (DFT) calculations and atomic force microscope (AFM) measurements are included for discussion...
January 25, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30672126/boron-subphthalocyanines-and-silicon-phthalocyanines-for-use-as-active-materials-in-organic-photovoltaics
#9
REVIEW
Trevor M Grant, David S Josey, Kathleen L Sampson, Thanmayee Mudigonda, Timothy P Bender, Benoît H Lessard
Organic photovoltaics (OPVs) have experienced continued interest over the last 25 years as a viable technology for the generation of power. Phthalocyanines are among the oldest commercial dyes and have been utilized in some of the earliest examples of OPVs. In recent years, the use of boron subphthalocyanines (BsubPcs) and silicon phthalocyanines (SiPcs) has attracted a flurry of interest with some examples of fullerene-free devices reaching power conversion efficiencies >8 %. Unlike other more common divalent phthalocyanines such as copper or zinc, BsubPcs and SiPcs contain additional axial groups that can easily be functionalized without significantly affecting the optoelectronic properties of the macrocycle...
January 23, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30663242/gold-palladium-nanocluster-catalysts-for-homocoupling-electronic-structure-and-interface-dynamics
#10
REVIEW
Masahiro Ehara, U Deva Priyakumar
The gold-palladium (Au-Pd) bimetallic nanocluster (NC) catalyst in colloidal phase performs the homocoupling reaction of various aryl chlorides (Ar-Cl) under ambient conditions. We have systematically investigated various aspects of the Au-Pd NC catalysts with respect to this homocoupling reaction by using density functional theory (DFT) calculations, genetic algorithm (GA) approaches, and molecular dynamics (MD) simulations. Our findings include the geometric and electronic structures of the Au-Pd NC, the reactive Pd sites on the NC surface, the electron-donating effects of surrounding polymer matrix, the reaction mechanism of homocoupling reaction and rate-determining step, the inverse halogen dependence of the reaction, and the solvation dynamics at interface region between NC and polymer matrix in aqueous solution...
January 21, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30663239/surface-compositions-of-oxide-supported-bimetallic-catalysts-a-compared-study-by-high-sensitivity-low-energy-ion-scattering-spectroscopy-and-x-ray-photoemission-spectroscopy
#11
REVIEW
Yangyang Li, Junjie Huang, Yanping Zheng, Mingshu Chen
It is well known that there is a critical relationship between the surface composition and catalytic performance for a bimetallic catalyst. However, in most cases, the surface composition is obviously different from that of the bulk. Moreover, the surface is normally reconstructed under reaction conditions. In this personal account, our recent progresses in determining the surface compositions of oxide supported bimetal catalysts by high-sensitivity low energy ion scattering spectroscopy (HS-LEIS) and X-ray photoemission spectroscopy (XPS) are summarized...
January 21, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30663230/designing-alternative-non-fullerene-molecular-electron-acceptors-for-solution-processable-organic-photovoltaics
#12
REVIEW
Geneviève Sauvé
Until recently, solution-processable organic photovoltaics (OPVs) mainly relied on fullerene derivatives as the n-type material, paired with a p-type conjugated polymer. However, fullerene derivatives have disadvantages that limit OPV performance, thus fueling research of non-fullerene acceptors (NFAs). Initially, NFAs showed poor performance due to difficulties in obtaining favorable blend morphologies. One example is our work with 2,6-dialkylamino core-substituted naphthalene diimides. Researchers then learned to control blend morphology by NFA molecular design...
January 21, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30663225/local-structure-study-of-lanthanide-elements-by-x-ray-absorption-near-edge-structure-spectroscopy
#13
REVIEW
Hiroyuki Asakura, Saburo Hosokawa, Kentaro Teramura, Tsunehiro Tanaka
This paper describes a systematic study of the spectra and local structures of lanthanide (Ln) L-edge XANES. We found that Ln L1 and L3 -edge XANES spectra exhibit characteristic features correlated to their local symmetry through experimental and theoretical simulations. We also propose a simple local structure index criterion for a combination of XANES study and theoretical simulation. Possible solutions of intrinsic problems such as low resolution of characteristic features in the Ln L-edge XANES and site distributions are also discussed...
January 21, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30663209/dimensional-control-in-contorted-aromatic-materials
#14
REVIEW
Samuel R Peurifoy, Thomas J Sisto, Fay Ng, Michael L Steigerwald, Rongsheng Chen, Colin Nuckolls
This Account details key developments in dimensional control of contorted aromatics for organic electronics. Coronene, perylene, pyrene, and [4]helicene, which are fragments of graphene, can be contorted using facile synthetic chemistry into large nanoribbons and nano-architectures. In comparing contorted or higher-dimensional graphene architectures to planar or lower-dimensional species, the materials properties are reliably enhanced for the contorted aromatics. Examples of enhanced properties include optical absorptivity, conductivity, device photoconversion efficiency, and solubility...
January 21, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30663204/functional-organic-semiconductors-based-on-bay-annulated-indigo-bai
#15
REVIEW
Matthew A Kolaczkowski, Yi Liu
The advancement of organic electronics has been continually pushed by the need for stable and high performance acceptor materials. By utilizing inexpensive and stable indigo dye as a starting material, Bay-Annulated Indigo (BAI) provides a new motif for the development of semiconducting materials. Modular and straightforward synthesis makes BAI an outstanding platform for molecular design, while excellent stability, strong absorption, and high ambipolar mobility render BAI-based materials excellent candidates for organic electronics...
January 21, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30648808/phosphorescent-pt-ii-emitters-for-oleds-from-triarylboron-functionalized-bidentate-complexes-to-compounds-with-macrocyclic-chelating-ligands
#16
REVIEW
Xiang Wang, Suning Wang
The development of organic light-emitting diodes (OLEDs) has attracted enormous research efforts from both academia and industry in the past decades and tremendous progress has been made. However, the low operation lifetime of the blue phosphorescent OLEDs remains as one of the greatest bottlenecks limiting further applications of OLEDs. To address this problem, design and synthesis of triplet emitters with high phosphorescence quantum yield (ΦP ) and adequate thermal, chemical, electrical and ultraviolet (UV) stabilities are vital...
January 16, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30645032/towards-green-synthesis-and-processing-of-organic-solar-cells
#17
REVIEW
Yunping Huang, Christine K Luscombe
In 2018, several major breakthroughs have been achieved in organic solar cells (OSCs) with the record power conversion efficiency (PCE) reaching over 17 %. With this increased efficiency, it is time to take a step forward to consider how to convert this technology into large scale production. For this, the economic and environmental profile of OSCs should be taken seriously-simplified synthetic routes and green chemistry methods should be applied. According to previous studies, OSCs are competitive and profitable in the commercial market...
January 15, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30637911/novel-emission-color-tuning-strategies-in-heteroleptic-phosphorescent-ir-iii-and-pt-ii-complexes
#18
REVIEW
Zhao Feng, Yuanhui Sun, Xiaolong Yang, Guijiang Zhou
Color-tuning for phosphorescent emitters in organic light-emitting diodes (OLEDs) across the entire visible spectrum is prerequisite to fulfil flexible full-color displays and white solid-state lighting. Heteroleptic 2-phenylpyridine-type (ppy-type) Ir(III) and Pt(II) complexes as phosphorescent emitters have been well exploited in the electroluminescence (EL) field due to their outstanding EL performance. Furthermore, the photophysical characters of these heteroleptic Ir(III) and Pt(II) complexes are generally dominated by the nature of cyclometalating ppy-type ligands...
January 14, 2019: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30592372/stereoselective-aromatic-ring-hydrogenation-over-supported-rhodium-catalysts-in-supercritical-carbon-dioxide-solvent
#19
REVIEW
M Shirai, N Hiyoshi, C V Rode
The combination of supported rhodium metal catalysts and supercritical carbon dioxide solvent was effective for the stereoselective ring hydrogenations of aromatic compounds at low temperature. Higher solubility of hydrogen in supercritical carbon dioxide provides higher concentration of hydrogen on the rhodium surface, but lower that of the intermediate on rhodium surface, which suppresses the flipping of surface intermediate, leading to higher catalyst activities and cis selectivities to the corresponding ring-hydrogenated products as compared with those in organic solvents...
December 28, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://read.qxmd.com/read/30592370/strategies-for-synthesis-of-imidazo-1-2-a-pyridine-derivatives-carbene-transformations-or-c-h-functionalizations
#20
REVIEW
Yue Yu, Zhengquan Su, Hua Cao
The imidazo[1,2-a]pyridines are an important target in organic synthetic chemistry and have attracted critical attention of chemists mainly due to the discovery of the interesting properties exhibited by a great number of imidazo[1,2-a]pyridine derivatives. Although lots of synthetic methods of imidazo[1,2-a]pyridines have been developed in the past years, the chemistry community faces continuing challenges to use green reagents, maximize atom economy and enrich the functional group diversity of product. Undoubtedly, with its low cost and lack of environmentally hazardous byproducts, cascade reactions and C-H functionalizations are ideal strategies for this field...
December 28, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
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