2D Semiconducting Metal–Organic Framework Thin Films for Organic Spin Valves

2D conductive metal–organic frameworks (2D c-MOFs) feature promising applications as chemiresistive sensors, electrode materials, electrocatalysts, and electronic devices. However, exploration of the spin-polarized transport in this emerging materials and development of the relevant spintronics have not yet been implemented. In this work, layer-by-layer assembly was applied to fabricate highly crystalline and oriented thin films of a 2D c-MOF, Cu₃(HHTP)₂, (HHTP: 2,3,6,7,10,11-hexahydroxytriphenylene), with tunable thicknesses on the La_0.67Sr_0.33MnO₃ (LSMO) ferromagnetic electrode. The magnetoresistance (MR) of the LSMO/Cu₃(HHTP)₂/Co organic spin valves (OSVs) reaches up to 25 % at 10 K. The MR can be retained with good film thickness adaptability varied from 30 to 100 nm and also at high temperatures (up to 200 K). This work demonstrates the first potential applications of 2D c-MOFs in spintronics.     

Organic synthesis--art or science?

The LHASA rules for finding strategic bonds in polycyclic target structures are analyzed with respect to the following question: Do the strategic bonds tend to give the greatest simplification upon disconnection, as measured by recently introduced indices of molecular complexity? The answer is yes, at least for the more general rules. This result implies that the bonds most useful for retrosynthetic disconnection can now be identified by a simple calculation rather than by application of a body of rules. It is concluded that organic synthesis, as far as described by these rules, has a mathematical basis and consequently can be considered a science as well as an art.     

Organic/inorganic nanocomposite polymer electrolyte

The organic/inorganic nanocomposites polymer electrolytes were designed and synthesized. The organic/inorganic nanocom-posites membrane materials and their lithium salt complexes have been found thermally stable below 200℃. The conductivity of the organic/inorganic nanocomposites polymer electrolytes prepared at room temperature was at magnitude range of 10-6 S/cm.     

Organic Photovoltaic Properties Based on Oligothiophenes

Organic photovoltaic devices have attracted a great attention because of their light weight and processability, and the ease of material design on the molecular level. There are a number of reports on organic photovoltaic devices using a variety of dyes1-…     

Acceleration of Organic Reactions Using Microwave

The use of microwave technology in accelerating organic reactions has received intense attention leading to immense growth recently. Accordingly, we have been interested in improving the efficacy of organic processes by microwave irradiation. Here we report our results on the microwave assisted direct amide formation from carboxylic acid and amine, the hydrolysis of biopolymers, and nucleophilic aromatic substitution reaction. The reactions carried out under microwave irradiation, in general, …     

Organic–inorganic hybrid melting gels

Melting gels are a class of organically modified silica gels that are rigid at room temperature, flow at temperature T1 and consolidate at temperature T2 (T2 > T1), when crosslinking is complete. The process of (a) softening, (b) becoming rigid and (c) re-softening can be repeated many times. Mixtures of mono-substituted alkoxysilanes and di-substituted alkoxysilanes have been studied in a systematic way to identify suitable melting gel compositions. The mixtures and the resulting melting gels have been characterized for their softening temperatures and consolidation temperatures. With an interest in using these materials for sealing microelectronics, their physical properties have been measured.     

"Handbook of Organic Chemistry"

本书由Dean,J.A.编著,由McGraw—Hill在1987年出版。它以表格形式按英文字母顺序给出了4000种有机化合物及与有机化学相关的无机化合物的名称、结构式、分子量、Beilstein文献、密度、折光指数、熔点、沸点、闪点和溶解度。其中一部分还给出了物理性质(包括粘度、介电常数、偶极矩和表面张力)、     

White and Red Organic Light Emitting Materials

Derivatives of 2,3-(1,4-dialkoxyaceno)norbornadiene underwent ring-opening metathesis polymerization (ROMP) upon the catalysis of a ruthenium complex to afford the corresponding polymers. The polymeric materials containing anthracene chromophores emit white electro-luminescence, which can be fabricated into light-emitting diodes (LED). The broad emission band is composed of a blue emission from anthracene and a red emission from aggregates. A single layer device, ITO/polymer/Ca/Al, can be…     

Small Organic Molecules for Direct Aldol Reaction

Since the pioneering finding by List and Barbas III and their coworkers that L-proline could work as a catalyst in the intermolecular direct aldol reaction, the concept of small organic molecules as catalysts has received great attention. However, new organic molecule which have better catalysis ability are reported scarcely. Our groups1 found L-Prolinamides 1 to be active catalysts for the direct aldol reaction of 4-nitrobenaldehyde with neat acetone at room temperature. The enantioselecti…     

Some Organic Reactions in Supercritical Carbon Dioxide

Organic reactions in supercritical carbon dioxide (scCO2) have facilitated great progress in recent years . ScCO2, as an environmentally friendly reaction medium, may be a substitute for 1 volatile and toxic organic solvents and show some special advantages. Firstly, CO2 is inexpensive, nonflammable, nontoxic and chemical inert under many conditions. Secondly, scCO2 possesses hybrid properties of both liquid and gas, to the advantage of some reactions involving gaseous reagents. Control o…     

Special Issue of ＂Organic Solids＂

The science of organic solids is the interdiscipline across chemistry, physics, photonics, electronics, magnetism, and various other specialties. Its research objects are focusing on exploitation of organic compounds and polymers having specific optical, electronic, and/or magnetic properties and their application technologies in photovoitaics, light-emitting diodes, field-effect transistors, and so on.     

Characterization of A New Organic Photochromic Compound

A new organic photochromic compound, 1-phenyl-3-methyl-4-(4-fluoro)-benzal-5-pyrazolone ethanyl-thiosemicarbazone (PM4FBP-ETSC) was found to undergo photochromic reactions in the solid state. Upon irradiation with 365nm light the white powder sample turned light yellow. The photochromic properties were characterized by the time-dependent UV-vis reflective spectra. The structure of PM4FBP-ETSC was determined by single crystal X-ray diffraction.     

A Japan–UK Collaboration in Organic Synthesis

This invited Team Profile was created by Shuo Wang, Igor Larrosa , Hideki Yorimitsu and Greg Perry . They recently published an article on carboxylic acid salts as dual-function reagents for carboxylation and carbon isotope labeling. This project brought together researchers based in Japan and the UK, and demonstrates how scientists with different cultural backgrounds can work together to build powerful results. “Carboxylic Acid Salts as Dual-Function Reagents for Carboxylation and Carbon Isotope Labeling”, S. Wang, I. Larrosa, H. Yorimitsu, G. J. P. Perry, Angew. Chem. Int. Ed. 2023 , e202218371 .     

Classified Subject Contents A .Synthetic Organic Chemistry

4 (Benzylcarbamoylphenyl)phenylammoniumTriflate (BCPPAT) :ANovelandEfficientCatalystforFriedel CraftsAlkylationofAromaticCompoundswithBenzylorCyclohexylAlcoholsLEI ,Ming ;GENG ,Liang ;WANG ,Yan Guang ( 4 3 8)…………………………………………………AConvenientandRapidMicrowave Enhanced ,SolventlessDesilylationProcedureUsingPotassiumCarbonateDopedonSilicaGelWANG ,Lei ;LI,Pin Hua ;CHEN ,Yun Cai;YAN ,Jin Can ;WANG ,Min ( 72 0 )……………………………………………………………     

A Novel Electrocatalysis Method for Organic Pollutants Degradation

As typical contaminants, phenolic pollutants are wide spread and are toxic to aquatic life. Thus the demand for new technology to remove or detoxify such organics should be widely recognized. Recently, electrochemical method has attracted a great deal of attention for treating such kinds of wastewater, mainly because of its amenability to automation, high efficiency and environmental compatibility1. Various electrochemical processes have been developed and anodic oxidation might be the most w…     

α-Carbonyl Radical Cyclizatio n in Organic Synthesis

Intramolecular radical cyclization reactions are now used routinely to synthesize carbocyclic and heterocyclic structures. We have reported that α-carbonyl radicals 1, generated from the corresponding iodo ketones or enones, underwent intramolecular radical cyclization smoothly to afford products 2.1, 2,3     

Pathway Dependence in Redox-Driven Metal–Organic Gels

Pathway dependence is common in self-assembly. Herein, the importance of pathway dependence for redox-driven gels is shown by constructing a Fe^II/Fe^III redox-based metal–organic gel system is shown. In situ oxidation of the Fe^II ions at different rates results in conversion of a Fe^II gel into a Fe^III organic gel, which controls the material properties, such as gel stiffness, gel strength, and an unusual swelling behaviour, is described. The rate of formation of Fe^III ions determines the extent of intermolecular interactions and so whether gelation or precipitation occurs.     

Isophorone-based Fluorescent Dopant for Red Organic Electroluminescence Device

IntroductionOrganiclight emittingdiodes (OLEDs)haveattractedconsiderableattentionsincetheinitialworksbyTangetal.1andFriendetal.2 duetotheirpotentialapplicationsinfull colorflat paneldisplays .3,4 Torealizefull colorap plications ,highperformanceorganicmaterialsemittingthethreeelementalcolorsofred ,greenandbluearerequired .Aftertwodecadesofintensiveresearch ,anumberofgreenandblueemitterswithhighluminousefficiencies ,reason ablecolorpurityandpracticallifetimehavenowbeenreal izedinbothsmallmole…