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Total 514633 results found since Jan 2013.
Quantitative NMR using water as internal calibrant
Magn Reson Chem. 2023 Sep 19. doi: 10.1002/mrc.5394. Online ahead of print.ABSTRACTA new quantitative nuclear magnetic resonance (qNMR) method, called qNMRw, using water as the internal calibrant has been developed. Its principles, procedures, calculations, and test results are presented here. It is shown to avoid the difficulties created by moisture present in other reference materials. High precision and accuracy can be achieved with qNMRw. The method can be used for analyzing technical materials, herbicide formulation products, and other types of chemical samples. It can also be used to measure the purity and concentrat...
Source: Magnetic Resonance in Chemistry : MRC - September 19, 2023 Category: Chemistry Authors: Bosong Xiang Source Type: research
Computational Studies and Synthesis of New Heterocyclics as CNS Agents
CONCLUSION: The designed scheme was executed in the departmental laboratory. The chemical structure of the compounds was confirmed on the basis of TLC, IR, and 1HNMR analyses. The docking study revealed a good docking score of the compounds. The Log P value of the compounds indicated their good penetration into CNS. The compounds were also screened for anxiolytic activity. Among them, compounds 4f, 4h, and P3 showed maximum activity as anti-anxiolytic agents.PMID:37723630 | DOI:10.2174/1570163820666230918100218
Source: Current Drug Discovery Technologies - September 19, 2023 Category: Drugs & Pharmacology Authors: Pooja Saini Sushil Kumar Source Type: research
Drug delivery using biocompatible covalent organic frameworks (COFs) towards a therapeutic approach
Chem Commun (Camb). 2023 Sep 19. doi: 10.1039/d3cc01829f. Online ahead of print.ABSTRACTCovalent organic frameworks (COFs) are constructed exclusively with lightweight organic scaffolds, which can have a 2D or 3D architecture. The ease of synthesis, robust skeleton and tunable properties of COFs make them superior candidates among their counterparts for a wide range of uses including biomedical applications. In the biomedical field, drug delivery or photodynamic-photothermal (PDT-PTT) therapy can be individually considered a potential parameter to be investigated. Therefore, this comprehensive review is focused on drug del...
Source: Chemical Communications - September 19, 2023 Category: Chemistry Authors: Pritam Ghosh Priyabrata Banerjee Source Type: research
Nanoflower-like high-entropy Ni-Fe-Cr-Mn-Co (oxy)hydroxides for oxygen evolution
Chem Commun (Camb). 2023 Sep 19. doi: 10.1039/d3cc04023b. Online ahead of print.ABSTRACTHigh-entropy materials (HEMs) have potential application value in electrocatalytic water splitting because of their unique alloy design concept and significant mixed entropy effect. Here, we synthesize a high-entropy Ni-Fe-Cr-Mn-Co (oxy)hydroxide on nickel foam (NF) by a solvothermal method. The flower-like structure of FeNiCrMnCoOOH/NF can provide abundant active sites, thus improving the oxygen evolution reaction (OER) activity. In 1 M KOH, the FeNiCrMnCoOOH/NF shows an ultra-low overpotential (η10) of 201 mV for the OER, superior to...
Source: Chemical Communications - September 19, 2023 Category: Chemistry Authors: Mingyuan Shi Tianmi Tang Liyuan Xiao Jingyi Han Xue Bai Yuhang Sun Siyu Chen Jingru Sun Yuanyuan Ma Jingqi Guan Source Type: research
Supramolecular interface decoration on a polymer conductor for an intrinsically stretchable near-infrared photodiode
Chem Commun (Camb). 2023 Sep 19. doi: 10.1039/d3cc04189a. Online ahead of print.ABSTRACTStretchable photodiodes with near-infrared (NIR) response face the challenge of material deficiency. A supramolecular cathode with excellent optical, tensile and electrical properties was proposed. Together with a stretchable organic heterojunction, we developed an intrinsically stretchable NIR photodiode with high detectivity over 1011 Jones and that remained functional under 100% strain.PMID:37724429 | DOI:10.1039/d3cc04189a
Source: Chemical Communications - September 19, 2023 Category: Chemistry Authors: Fan Chen Yiming Li Yan Chen Yi-Xuan Wang Wenping Hu Source Type: research
Stereo- and regiocontrol in intermolecular 2+2 cycloadditions between diarylketenes and allenamides to access substituted α-methylenecyclobutanones
Chem Commun (Camb). 2023 Sep 19. doi: 10.1039/d3cc03979j. Online ahead of print.ABSTRACTThe development of intermolecular [2+2] cycloadditions between allenamides and diarylketenes is described. α-Aryldiazo arylketones are employed as ketene precursors that react smoothly with allenamides in the presence of a P(C6F5)3 promoter. High diastereoselectivity (dr > 20 : 1) with endo-regioselectivity can be achieved when two aryl groups of ketenes have opposite electronic properties. The role of P(C6F5)3 is to increase the reaction yields, but also enhancing stereoselectivity.PMID:37724358 | DOI:10.1039/d3cc03979j
Source: Chemical Communications - September 19, 2023 Category: Chemistry Authors: Akshay Suresh Kshirsagar Sayaji Arjun More Rai-Shung Liu Source Type: research
Near zero-strain silicon oxycarbide interphases for stable Li-ion batteries
Chem Commun (Camb). 2023 Sep 19. doi: 10.1039/d3cc03799a. Online ahead of print.ABSTRACTWe investigate silicon oxycarbide nanotubes that incorporate Si, SiC, and silicon oxycarbide phases, which exhibit near zero-strain volume expansion, leading to reduced electrolyte decomposition. The composite effectively accommodates the formation of c-Li15Si4, as validated by in situ TEM analyses and electrochemical tests, thereby proposing a promising solution for Li-ion battery anodes.PMID:37724043 | DOI:10.1039/d3cc03799a
Source: Chemical Communications - September 19, 2023 Category: Chemistry Authors: Su Jeong Yeom Tae-Ung Wi Soon-Jae Jung Myeong Seon Kim Sang-Chae Jeon Hyun-Wook Lee Source Type: research
Simultaneously recorded photochemical action plots reveal orthogonal reactivity
Chem Commun (Camb). 2023 Sep 19. doi: 10.1039/d3cc03777k. Online ahead of print.ABSTRACTWe map the photochemical reactivity of two chromophores-a pyrene-chalcone and a methylene blue protected amine-from a one-pot reaction mixture based on their dynamic absorptivity changes upon light exposure, constructing a dual action plot. We employ the action plot data to determine a pathlength-independent λ-orthogonality window, allowing the orthogonal folding of distinct polymer chains into single chain nano-particles (SCNPs) from the same reaction mixture.PMID:37724042 | DOI:10.1039/d3cc03777k
Source: Chemical Communications - September 19, 2023 Category: Chemistry Authors: Ishrath Mohamed Irshadeen Vinh X Truong Hendrik Frisch Christopher Barner-Kowollik Source Type: research
A visible light-driven direct synthesis of industrially relevant glutaric acid diesters from aldehydes
Chem Commun (Camb). 2023 Sep 19. doi: 10.1039/d3cc02557h. Online ahead of print.ABSTRACTA straightforward and practical method has been developed to access α-substituted glutaric diesters from acrylates and aldehydes using visible light, with Eosin Y facilitating hydrogen atom transfer (HAT) and subsequent Giese-type addition. Also, sunlight has been successfully used as an alternative sustainable light source. The method has also been explored to access substituted 4,5-dihydro-2H-pyridazinones, which have potential biological and industrial applications. Comprehensive mechanistic investigations have been carried out.PMID...
Source: Chemical Communications - September 19, 2023 Category: Chemistry Authors: Anindita Bhowmick Abhijit Chatterjee Sidharth S Pathak Ramakrishna G Bhat Source Type: research
Effect of electrical and chemical (activation versus inactivation) stimulation of the infralimbic division of the medial prefrontal cortex in rats with chronic neuropathic pain
This study aimed to investigate the participation of the infralimbic division (IFL) of the mPFC in chronic NP, as well as the role of the N-methyl-D-aspartic acid receptor (NMDAr) in the elaboration of chronic NP. Male Wistar rats were submitted to the von Frey and acetone tests to assess mechanical and cold allodynia after 21 days of chronic constriction injury (CCI) of the sciatic nerve or Sham-procedure ("false operated"). Electrical neurostimulation of the IFL/mPFC was performed by low-frequency stimuli (20 μA, 100 Hz) applied for 15 s by deep brain stimulation (DBS) device 21 days after CCI. Either cobalt chloride (C...
Source: Experimental Brain Research - September 19, 2023 Category: Neuroscience Authors: Thais Lohanny Moura-Pacheco Renata Cristina Martins-Pereira Priscila Medeiros Louren ço Sbragia Christie Ramos Andrade Leite-Panissi H élio Rubens Machado Norberto Cysne Coimbra Renato Leonardo de Freitas Source Type: research
Potassium stearate doped PEDOT:PSS improves the performance of inverted perovskite solar cells
Chem Commun (Camb). 2023 Sep 19. doi: 10.1039/d3cc03539e. Online ahead of print.ABSTRACTPoly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) suffers from lower conductivity and surface defects, which hinders the extraction and transport of effective charges, thereby reducing the Power conversion efficiency (PCE) and long-term stability of PSCs. Therefore, this study introduces potassium stearate (KSt) doping in PEDOT:PSS to regulate its conductivity and interface charge transfer. As a result, KSt-doped PEDOT:PSS increase the PCE of the device from 16.35% to 18.35%. Moreover, the PCE of PSCs with KSt-doped PE...
Source: Chemical Communications - September 19, 2023 Category: Chemistry Authors: Ying Li Yanqing Yao Yuanlin Yang Xusheng Zhao Wan Cheng Banghui Chen Lijia Chen Ping Li Shuhui Tang Source Type: research
Interface charge distribution engineering of Pd-CeO2/C for efficient carbohydrazide oxidation reaction
ChemSusChem. 2023 Sep 18:e202301078. doi: 10.1002/cssc.202301078. Online ahead of print.ABSTRACTCarbohydrazide electrooxidation reaction (COR) is a potential alternative to oxygen evolution reaction in water splitting process. However, the sluggish kinetics process impels to develop efficient catalysts with the aim of the widespread use of such catalytic system. Since COR concerns the adsorption/desorption of reactive species on catalysts, the electronic structure of electrocatalyst can affect the catalytic activity. Interface charge distribution engineering can be considered to be an efficient strategy for improving catal...
Source: ChemSusChem - September 19, 2023 Category: Chemistry Authors: Tianjun Hu Jiali Liu Hongjie Yuan Limin Zhang Ying Wang Source Type: research
The glass transition in the high-density amorphous Zn/Co-ZIF-4
Chem Commun (Camb). 2023 Sep 19. doi: 10.1039/d3cc02492j. Online ahead of print.ABSTRACTThe high-density amorphous phases (HDAs) of bimetallic zeolitic imidazolate frameworks (Zn/Co-ZIF-4) were prepared. The temperature dependence of the isobaric heat capacity (Cp) of ZIF-4 HDAs was measured to determine the glass transition temperature (Tg) of HDAs. The Tg non-linearly decreases with the molar ratio R, where R is Co/(Co + Zn), indicating the presence of a mixed-metal node effect. This effect arises from the non-linear increase of the degree of configurational freedom in the HDA as R increases. The degree of configurationa...
Source: Chemical Communications - September 19, 2023 Category: Chemistry Authors: Zijuan Du Ang Qiao Hemin Zhou Zhencai Li Wessel M W Winters Jiexin Zhu Guanjie He Ivan P Parkin Haizheng Tao Yuanzheng Yue Source Type: research
Synthesis of Electrical Conductive Metal-Organic Frameworks for Elelctrochemical Applications
Chem Rec. 2023 Sep 18:e202300141. doi: 10.1002/tcr.202300141. Online ahead of print.ABSTRACTElectrical conductivity is very important property of nanomaterials for using wide range of applications especially energy applications. Metal-organic frameworks (MOFs) are notorious for their low electrical conductivity and less considered for usage in pristine forms. However, the advantages of high surface area, porosity and confined catalytic active sites motivated researchers to improve the conductivity of MOFs. Therefore, 2D electrical conductive MOFs (ECMOF) have been widely synthesized by developing the effective synthetic st...
Source: Chemical Record - September 19, 2023 Category: Chemistry Authors: Syed Shoaib Ahmad Shah Muhammad Altaf Nazir Azhar Mahmood Manzar Sohail Aziz Ur Rehman Muhammad Khurram Tufail Tayyaba Najam Muhammad Sufyan Javed Sayed M Eldin Md Rezaur Rahman Mohammed M Rahman Source Type: research
Formulation and Development of Flurbiprofen Colon-Specific Eudragit Coated Matrix Tablets: Use of a Novel Crude Banana Peel Powder as a Time-Dependent Polymer
In conclusion, utilizing CBP as a natural, time-dependent polymer in conjunction with Eudragit® S 100 to develop the flurbiprofen tablets seems like a promising approach for delivering drugs specifically to the colon.PMID:37726501 | DOI:10.1208/s12249-023-02646-0
Source: AAPS PharmSciTech - September 19, 2023 Category: Drugs & Pharmacology Authors: Sateesh Kumar Vemula Bhaskar Daravath Sridhar Babu Gummadi Michael Repka Source Type: research
