Xiu-Qin Li

National Institute of Metrology

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Li‐Ya Wang

Nanyang Normal University

Lu‐Fang Ma

Luoyang Normal University

Hong‐Wei Hou

Institute of Hydrobiology

Qinglei Meng

Huazhong University of Science and Technology

Miao Du

Zhengzhou University of Light Industry

Bin-Liu

Ministry of Education of the People's Republic of China

Qinghe Zhang

National Institutes for Food and Drug Control

Hongwei Hou

Zhengzhou University

Shuyu Liu

University of Science and Technology of China

Xianjiang Li

National Institute of Metrology

Cooperative Institutions

National Institute of Metrology

Chinese Academy of Sciences

Zhengzhou University

Bureau international des poids et mesures

East China University of Science and Technology

Instituto Nacional de Metrologia, Qualidade e Tecnologia

China University of Petroleum, Beijing

University of Chinese Academy of Sciences

Ministry of Education of the People's Republic of China

Universidade de Caxias do Sul

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Synthesis and electrochemical properties of λ-MnO_2 as cathode material of Li-MnO_2 batteries

Chinese Journal of Power Sources (2009)

Xiu-Qin Li

The λ-manganese dioxide (λ-MnO2) was synthesized by acidifying spinel lithium manganese dioxide (LiMn2O4). The crystalline structure, morphology and electrochemical properties of λ-MnO2 were investigated by X-ray diffraction, scanning electron microscopy and galvanostatic discharge test. The results show that λ-MnO2 has the same spinel-type structure like LiMn2O4, and it has small particle size, regular morphology, and uniform distribution of particle size. λ-MnO2 delivers a discharge capacity of 268 mAh/g at a rate of 0.025 C in discharge plateau 3.98 V and 2.88 V. Therefore, λ-MnO2 is a promising cathode material for primary Li-MnO2 batteries, and its discharge capacity and discharge plateau are scarcely influenced by discharge rate.

Lithium battery

Morphology

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CCDC 800358: Experimental Crystal Structure Determination

The Cambridge Structural Database (2011)

Lu‐Fang Ma Xiu-Qin Li Bin-Liu Li‐Ya Wang Hong‐Wei Hou

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccvvv0j

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Key Comparison Study - Organic Solvent Calibration Solution - Gravimetric preparation and value assignment of aflatoxin B1 (AfB1) in acetonitrile (ACN)

Metrologia (2022)

R D Josephs Magali Bedu Adeline Daireaux Xiu-Qin Li Xiaomin Li

Main text The CCQM-K154.b comparison was coordinated by the Bureau International des Poids et Mesures (BIPM) and the Chinese National Institute of Metrology (NIM) on behalf of the Organic Analysis Working Group (OAWG) of the Comité Consultatif pour la Quantité de Matière (CCQM) for National Measurement Institutes (NMIs) and Designated Institutes (DIs) which provide measurement services in organic analysis under the 'Comité International des Poids et Mesures' Mutual Recognition Arrangement (CIPM MRA) and/or have participated in the BIPM's Mycotoxin Metrology Capacity Building and Knowledge Transfer (MMCBKT) project as part of its "Metrology for Safe Food and Feed in Developing Economies" Capacity Building Programme. Gravimetrically-prepared solutions having an assigned mass fraction of specified organic analytes are routinely used to calibrate measurement processes for the quantification of the same analytes in matrix samples. Appropriate assignments of the property value and associated uncertainty of calibration solutions thus underpin the traceability of routine analysis and are critical for accurate measurements. Evidence of successful participation in relevant international comparisons is needed to document calibration and measurement capability claims (CMCs) made by national metrology institutes and designated institutes. In total, eleven NMIs/DIs participated in the Track C, Model II, Key Comparison CCQM-K154.b [Gravimetric preparation and value assignment of aflatoxin B1 (AfB1) in acetonitrile (ACN)] for emerging areas of global interest and innovation. Participants were requested to gravimetrically prepare calibration solutions and value assign the mass fractions, expressed in mg/kg, of aflatoxin B1 (AfB1) in the acetonitrile (ACN) solution. Study samples, with assigned values and associated uncertainties were prepared by the comparison participants and sent to the coordinating laboratory for comparison. The Key Comparison Reference Values (KCRVs), calculated form values measured by the coordinating laboratory based on calibrations obtained from independent gravimetrically prepared calibrant solutions, agreed with participants reported values, within their stated uncertainties. AfB1 was selected to be representative of polar aflatoxins. Aflatoxins are a class of mycotoxins generally produced by fungi of the genus Aspergillus. It was anticipated to provide a challenge representative for the gravimetrical preparation and value assignment of calibration solutions in the mass fraction range of 2 mg/kg to 50 mg/kg of mycotoxins with broadly similar structural characteristics. Nine participants of the MMCBKT programme were provided with a stock solution having a known AfB1 mass fraction and expanded uncertainty to use to gravimetrically prepare and value assign a calibration solution. Three NMIs/DIs also participated using their own calibration solutions. The use of in-house solutions required an additional capacity to undertake a fit-for-purpose purity assessment. NIM was the only NMI participating using both the MMCBKT based and their own in-house assigned solutions in order to connect the two different groups. It was decided to propose separate KCRVs for each of the two ampoules provided by the participating NMIs/DIs based on the AfB1 mass fraction. This allowed participants to demonstrate the efficacy of their implementation of the approaches used to gravimetrically prepare calibration solutions and to assess the AfB1 mass fraction. The majority of the AfB1 mass fraction KCRVs (wKCRV) for CCQM-K154.b spanned a mass fraction range of 2.02 mg/kg to 31.57 mg/kg. The relative expanded uncertainties U(wKCRV) ranged from 0.69 % to 2.93 %. Inspection of the degree of equivalence plots for the AfB1 mass fraction assignments in CCQM-K154.b indicated that there was an excellent agreement of results. Solely, the AfB1 mass fraction assignments of INRAP did not agree with the KCRVs. It was found that the samples were altered as a result of an acid contamination. To reach the main text of this paper, click on Final Report . Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/ . The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

Mutual Recognition

Gravimetric analysis

Traceability

10.1088/0026-1394/59/1a/08002

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Syntheses, structures and magnetic properties of cobalt(ii) and nickel(ii) complexes based on 5-methylisophthalate and different dipyridyl-containing ligands

CrystEngComm (2011)

Lu‐Fang Ma Xiu-Qin Li Bin-Liu Li‐Ya Wang Hongwei Hou

Four new CoII and NiII coordination polymers, {[Co(mip)(bpa)]}n (1), {[Co(mip)(bpp)]}n (2), {[Ni(mip)(bpa)]}n (3), {[Ni(mip)(bpp)(H2O)]}n (4) (H2mip = 5-methylisophthalic acid, bpa = 1,2-bi(4-pyridyl)-ethane, bpp = 1,3-di(4-pyridyl)-propane), were prepared viahydrothermal reactions based on H2mip and two bridging dipyridyl ligands. Their crystal structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses and IR spectra. Complexes 1 and 3 are structurally similar with an infinite bilayer spanning two different directions except for the different central metal ions. The structure of 2 shows a 1D polymeric ribbon due to the GG conformation of the bpp ligand, which is further extended to a 2D supramolecular layer by the C–H⋯π interactions. Complex 4 possesses a two-fold interpenetrating (3,5)-connected hms network constructed from supramolecular interactions. The structural and topological differences of the four complexes demonstrate that the central metal ions and the characteristics of the N-donor auxiliary ligands play significant roles in constructing the novel architectures of coordination polymers. The magnetic properties of 1–4 were studied in the 2–300 K region at 2000 G.

Ribbon

Pyrazine

Bridging ligand

10.1039/c1ce05177f

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Syntheses and characterization of nickel(ii) and cobalt(ii) coordination polymers based on 5-bromoisophthalate anion and bis(imidazole) ligands

CrystEngComm (2011)

Lu‐Fang Ma Xiu-Qin Li Li‐Ya Wang Hongwei Hou

Four new NiII and CoII complexes, [Ni(5-Br-ip)(bip)(H2O)]n (1), [Ni(5-Br-ip)(bib)]n (2), [Co(5-Br-ip)(bip)]n (3) and [Co(5-Br-ip)(bip)]n (4) (5-Br-H2ip = 5-bromoisophthalic acid, bip = 1,3-bis(imidazol)propane, bib = 1,4-bis(imidazol)butane), have been synthesized and structurally characterized by elemental analysis, IR and single-crystal X-ray diffraction. Complex 1 features a 2D double layer extended by the intermolecular hydrogen bonds between 2D layers. Complex 2 shows a 2-fold interpenetrating 3D → 3D network based on the dinuclear Ni(II) units. Complexes 3 and 4 can be regarded as supramolecular structural isomers. Isomer 3 possesses a 1D chain structure with binuclear Co units as subunits. Isomer 4 shows a 3D network and can be reduced to a 4-connected net with the (65.8) topology. The structural differences indicate that the backbone of the organic N-donor ligands and the nature of the metal ions play important roles in governing the structures of such metal–organic coordination architectures. Moreover, the magnetic properties of complexes 2 and 3 were also studied in 2–300 K.

Butane

Imidazole

Propane

Coordination polymer

10.1039/c1ce05308f

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Citations (47)

CCDC 800356: Experimental Crystal Structure Determination

The Cambridge Structural Database (2011)

Lu‐Fang Ma Xiu-Qin Li Bin-Liu Li‐Ya Wang Hongwei Hou

10.5517/ccvvtyf

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CCDC 776696: Experimental Crystal Structure Determination

The Cambridge Structural Database (2011)

Lu‐Fang Ma Xiu-Qin Li Qinglei Meng Li‐Ya Wang Miao Du

10.5517/ccv26qt

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Discuss About the chemical Reaction Conersion

Journal of Zaozhuang University (1994)

Xiu-Qin Li

In this paper, we discuuss about the correct de(?)(?)ition of chemical reaction conerslon, and redress th e inapportune staemet in some teaching material

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CCDC 757580: Experimental Crystal Structure Determination

The Cambridge Structural Database (2011)

Hongwei Hou Xiu-Qin Li Lu‐Fang Ma Li‐Ya Wang

10.5517/cctfb2m

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CCDC 800355: Experimental Crystal Structure Determination

The Cambridge Structural Database (2011)

Lu‐Fang Ma Xiu-Qin Li Bin-Liu Li‐Ya Wang Hong‐Wei Hou

10.5517/ccvvtxd

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