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Bis(L-asparaginato)zinc(Ⅱ)掺Cu^(2+)的能级(英文) 被引量:1
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作者 张玲 杜懋陆 +1 位作者 詹科 肖学峰 《西南民族大学学报(自然科学版)》 CAS 2007年第6期1400-1403,共4页
推算出了3d9离子在立方对称下的能级计算公式,并用此公式计算出了Bis(L-asparaginato)zinc(Ⅱ)晶体掺Cu2+从基态2A1(ε)到激发态2A1(θ),2B1(ζ),2B2(η),2B3(ξ)的能级,它们分别为10938cm-1,14288cm-1,19184cm-1,37397cm-1,计算结果跟... 推算出了3d9离子在立方对称下的能级计算公式,并用此公式计算出了Bis(L-asparaginato)zinc(Ⅱ)晶体掺Cu2+从基态2A1(ε)到激发态2A1(θ),2B1(ζ),2B2(η),2B3(ξ)的能级,它们分别为10938cm-1,14288cm-1,19184cm-1,37397cm-1,计算结果跟实验结果吻合的很好. 展开更多
关键词 bis(L-asparaginato)zinc(II)晶体 能级 D2h对称
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Hydrothermal Syntheses,Crystal Structures,and Characterization of Two Zinc(Ⅱ)Complexes Containing Flexible Bis(benzimidazole)Ligands 被引量:2
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作者 刘晓兵 张泽婷 +3 位作者 王艳彦 刘蕊 赵永 崔广华 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2016年第11期1745-1753,共9页
Two zinc(II) complexes, namely, [Zn(L1)Cl2]2 (1) and {[Zn(L2)(tbta)]·3H2O}n (2) (L1 = 1,3-bis(2-methylbenzimidazol-1-ylmethyl)benzene, H2tbta = tetrabromoterephthalic acid, L2 = 1,3-bis(2-methylbe... Two zinc(II) complexes, namely, [Zn(L1)Cl2]2 (1) and {[Zn(L2)(tbta)]·3H2O}n (2) (L1 = 1,3-bis(2-methylbenzimidazol-1-ylmethyl)benzene, H2tbta = tetrabromoterephthalic acid, L2 = 1,3-bis(2-methylbenzimidazol-1-yl)-2-propanol) have been successfully obtained under hydrothermal conditions. Complex 1 displays binuclear structure which is further extended into a 1D supramolecular chain through π–π stacking. Complex 2 features 2D (4,4) network based on L2/tbta2– double linker. The thermal stability, fluorescence properties and catalytic activities of two complexes for degradation of Methyl orange in a Fenton-like process were discussed. 展开更多
关键词 bis(benzimidazole) catalytic property crystal structure fluorescence property zinc(Ⅱ) complex
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Two Tetranuclear Zinc(Ⅱ) Coordination Polymers Based on 3,5-Bis(2-carboxylphenoxy)benzoic Acid with Highly Selective Sensing of Nitrobenzene 被引量:1
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作者 房克功 赵倩楠 +1 位作者 李苗苗 胡拖平 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2018年第5期787-795,共9页
Two novel zinc(Ⅱ) coordination polymers, [Zn2(BCB)(CH3OH)(μ3-OH)]n(1) and {[Zn2(BCB)(μ3-OH)(H2O)2]·CH3OH}n (2), have been constructed from 3,5-bis(2-carboxylphenoxy)benzoic acid(H3BCB) an... Two novel zinc(Ⅱ) coordination polymers, [Zn2(BCB)(CH3OH)(μ3-OH)]n(1) and {[Zn2(BCB)(μ3-OH)(H2O)2]·CH3OH}n (2), have been constructed from 3,5-bis(2-carboxylphenoxy)benzoic acid(H3BCB) and characterized by elemental analysis(EA), IR, powder X-ray diffraction(PXRD), and thermogravimetric(TG) analyses. Structural analysis reveals that complexes 1 and 2 are both 1D polymeric chains with unprecedented tetranuclear {Zn4(COO)4(μ3-OH)2} clusters, which were further expanded into a 2D structure. Fluorescence measurements show that 1 and 2 have highly selective and sensitive detection of nitrobenzene. 展开更多
关键词 3 5-bis(2-carboxylphenoxy)benzoic acid tetranuclear cluster zinc luminscence SENSING
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Synthesis and Structure of Zinc Complex of N, N-bis ( benzimidazol-2-yl-methyl ) amine
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作者 Xiao Lan LIU Qing Yan CHENG +3 位作者 Xia YANG Zhi Wei MIAO Wei LIU Fang Ming MIAO 《Chinese Chemical Letters》 SCIE CAS CSCD 2001年第6期563-564,共2页
The Zinc complex of N, N-bis (benzimidazol 2-yl-methy])amine has been synthesized and its crystal structure determined by X-ray diffraction method. The structure features of the complex are described.
关键词 zinc compex N N-bis (benzimidazol-2-yl-methyl)amine superoxide dismutase (SOD)
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Synthesis and Crystal Structure of 3,3'-Bis(2-benzimidazolyl)-2,2'-dipyridine with Hydrated Zinc(Ⅱ) Perchlorate
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作者 苗少斌 吉保明 杜晨霞 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2007年第4期439-444,共6页
The reaction of Zn(ClO4)2·6H2O with 3,3'-bis(2-benzimidazolyl)-2,2'-dipyridine (L) gave a mononuclear zinc(Ⅱ) complex: [ZnL2](CIO4)2·2DMF·4H2O, which was structurally characterized by EA, ... The reaction of Zn(ClO4)2·6H2O with 3,3'-bis(2-benzimidazolyl)-2,2'-dipyridine (L) gave a mononuclear zinc(Ⅱ) complex: [ZnL2](CIO4)2·2DMF·4H2O, which was structurally characterized by EA, IR, UV, ^1H NMR, fluorescence spectrum and single-crystal X-ray diffraction. The crystal (C54H54Cl2N14O14Zn, Mr = 1259.38) belongs to the monoclinic system, space group C2/c with a = 20.874(2), b = 14.9953(16), c = 20.462(3)A,β= 101.553(2)°, V= 6274.8(13) A, Z= 4, Dc= 1.333 g/cm^3, F (000) = 2608,/a(MoKcr) = 0.548 mm 1, R = 0.0682 and wR = 0.1931 for 4984 observed reflections with I 〉 2σ(I). The Zn(Ⅱ) is four-coordinated in a slightly distorted tetrahedral geometry through four N atoms from four benzimidazole units of two ligands. In the crystal lattice, the [ZnL2]2^+ cations are linked to each other by extensive intermolecular hydrogen bonds between nitrogen atoms of benzimidazole rings, water and DMF molecules. 展开更多
关键词 zinc perchlorate hexahydrate 3 3'-bis(benzimidazolyl)-2 2'-dipyridine crystal structure
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油酸锌/脲嘧啶复合热稳定剂对PVC性能的影响
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作者 宋莉芳 李开元 +3 位作者 黄卓辰 霍慧文 夏慧芸 牛艳辉 《塑料》 CAS CSCD 北大核心 2024年第1期42-47,共6页
为了改善软质聚氯乙烯(PVC)的初始白度和长期热稳定性,制备由具有不饱和链的油酸锌和含氨基的脲嘧啶(6-氨基-1,3-二甲基脲嘧啶,DAU)组成的复合热稳定剂,添加合适的辅助稳定剂和增塑剂,进行聚氯乙烯热加工。采用刚果红试验法和干燥箱热... 为了改善软质聚氯乙烯(PVC)的初始白度和长期热稳定性,制备由具有不饱和链的油酸锌和含氨基的脲嘧啶(6-氨基-1,3-二甲基脲嘧啶,DAU)组成的复合热稳定剂,添加合适的辅助稳定剂和增塑剂,进行聚氯乙烯热加工。采用刚果红试验法和干燥箱热老化试验法分析复合稳定剂对PVC静态热稳定性的影响;采用转矩流变测试评价其对PVC动态热稳定性的影响;利用红外光谱法研究复合稳定剂的热稳定机理。结果表明,油酸锌与脲嘧啶复合后,稳定剂与PVC的相容性提高,初始白度得到改善;复合稳定剂中DAU与油酸锌(DAU/Zn)的最佳比例为4∶1,长期热稳定性可达100 min;另外,加入辅助稳定剂和增塑剂使PVC的热稳定效果得到进一步改善。 展开更多
关键词 聚氯乙烯 油酸锌 脲嘧啶 热稳定性 热稳定机理
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磷-锡环保复合协效阻燃剂制备及其在PVC中的应用
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作者 陈立全 洪建婷 +5 位作者 宁立新 彭雨晴 李爱军 马殿普 王金合 刘立起 《上海大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第3期373-389,共17页
通过沉淀包覆法制备不同包覆比例的植酸锡包覆羟基锡酸锌(tin phytate coated zinc hydroxystannate,ZHS@Sn-Phyt)复合协效阻燃剂,并应用在软质聚氯乙烯(polyvinyl chloride,PVC)中.采用X射线衍射(X-ray diffraction,XRD)、扫描电子显微... 通过沉淀包覆法制备不同包覆比例的植酸锡包覆羟基锡酸锌(tin phytate coated zinc hydroxystannate,ZHS@Sn-Phyt)复合协效阻燃剂,并应用在软质聚氯乙烯(polyvinyl chloride,PVC)中.采用X射线衍射(X-ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)、傅里叶变换红外光谱(Fourier transform infrared spectroscopy,FTIR)、X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)和热重分析(thermo-gravimetric analysis,TGA)对包覆结构进行分析表征,同时对PVC复合材料进行极限氧指数(limiting oxygen indexand,LOI)、锥形量热(cone calorimetry,CONE)和力学性能测试.结果表明:在羟基锡酸锌(zinc hydroxystannate,ZHS)表面和植酸锡(tin phytate,Sn-Phyt)包覆层之间以Sn—O—P—O—Zn离子键的形式形成稳定的包覆结构;当复合阻燃剂中Sn-Phyt∶ZHS质量比为1∶9时,对PVC的阻燃效果最佳,表现出较好的协同阻燃作用,LOI比加入相同份数ZHS的PVC样品增加了1.6%,热释放速率峰值和热释放总量分别降低了18.9%和31.7%,残炭率提高了6.1%,烟释放总量相差不大,拉伸强度和断裂伸长率分别为26.79 MPa和296.5%,也均优于后者.因此,制备了一种高效绿色阻燃剂用以阻燃PVC,所制备的磷-锡协效阻燃剂具有绿色环保和工艺简单的优点. 展开更多
关键词 植酸锡 羟基锡酸锌 聚氯乙烯 阻燃 环保
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聚乙烯醇基凝胶聚合物电解质的制备及在锌离子混合电容器中的应用
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作者 左丹英 王静静 +2 位作者 杨赫 许静 张宏伟 《高分子材料科学与工程》 EI CAS CSCD 北大核心 2024年第2期157-163,共7页
锌离子混合电容器(ZIHC)兼有电池高能量密度和电容器高功率密度的特点,是下一代能源存储设备的有力竞争者,但电池型阴极-电容型阳极ZIHC的研究中使用的多为电解质溶液,容易泄漏而导致安全风险。针对这一问题,文中以纤维素、羟乙基纤维... 锌离子混合电容器(ZIHC)兼有电池高能量密度和电容器高功率密度的特点,是下一代能源存储设备的有力竞争者,但电池型阴极-电容型阳极ZIHC的研究中使用的多为电解质溶液,容易泄漏而导致安全风险。针对这一问题,文中以纤维素、羟乙基纤维素和聚乙烯醇为原料,通过冷冻-解冻和电解液吸收的方法,快速制备了具有蜂巢状的三维网络形貌的凝胶聚合物电解质(GPE)。优化的GPE不仅具有良好力学性能(拉伸强度0.24 MPa、断裂伸长率289%),而且表现出较高的离子电导率(58.5 mS/cm)。使用GPE、二氧化锰阴极和活性炭阳极组成的ZIHC,其比电容和能量密度分别为31.5 F/g和15.0 Wh/kg,2 A/g充放电循环1.5×104次后比电容保持率约80%,展示出GPE在ZIHC领域中潜在的应用价值。原料环保和方便快捷的制备方法为能量存储和柔性可穿戴电子领域应用的GPE研究提供了新的思路。 展开更多
关键词 聚乙烯醇 凝胶聚合物电解质 锌离子混合电容器
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单宁酸/氧化锌/聚乙烯醇复合膜的制备及其性能研究
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作者 宋文利 曹苍久 +1 位作者 吴芳蕊 顾周延 《纤维素科学与技术》 CAS 2024年第2期23-27,共5页
以聚乙烯醇(PVA)作为基材,引入单宁酸(TA),氧化锌纳米粒子(ZnO NPs),溶入DMSO混合水溶液中,通过冻融法制备得到TA/ZnO/PVA复合膜。用扫描电子显微镜、万能拉力试验机、接触角测量仪和紫外分光光度计等表征了TA/ZnO/PVA复合膜的形貌结构... 以聚乙烯醇(PVA)作为基材,引入单宁酸(TA),氧化锌纳米粒子(ZnO NPs),溶入DMSO混合水溶液中,通过冻融法制备得到TA/ZnO/PVA复合膜。用扫描电子显微镜、万能拉力试验机、接触角测量仪和紫外分光光度计等表征了TA/ZnO/PVA复合膜的形貌结构、力学性能、亲水性和紫外防护性能等。结果表明:TA/ZnO/PVA复合膜表面均匀光滑,拉伸应力最大为1.41 MPa,断裂伸长率最大为670%,接触角最大为29.9°,复合膜中的羟基通过氢键等分子间相互作用,提升了复合材料的力学特性以及亲水性。当DMSO与水的比例为3∶7时,复合膜的紫外防护性能最好,紫外光透过率几乎为零,TA与ZnO NPs的加入提高了材料的紫外防护性能。因此,TA/ZnO/PVA复合膜因其优异的力学性能、亲水性和紫外防护性能,在制备防紫外线产品以及医用敷料等领域展现出了广阔的应用前景。 展开更多
关键词 单宁酸 聚乙烯醇 氧化锌纳米粒子 紫外防护性能 复合膜
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ICP-AES法测定锌浮渣中镉、砷、锑、铋含量
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作者 孙帅楠 王源瑞 +3 位作者 方彦霞 李秀花 李金明 姚应锋 《甘肃冶金》 2024年第4期134-137,共4页
锌浮渣样品通过盐酸-硝酸-氢氟酸-高氯酸溶解完全后,冷却,加入5 mL盐酸溶解盐类至溶液清亮,以基体匹配法绘制标准曲线避免基体的干扰,建立了电感耦合等离子体原子发射光谱法(ICP-AES)测定锌浮渣样品中Cd、As、Sb、Bi的化学分析方法。在... 锌浮渣样品通过盐酸-硝酸-氢氟酸-高氯酸溶解完全后,冷却,加入5 mL盐酸溶解盐类至溶液清亮,以基体匹配法绘制标准曲线避免基体的干扰,建立了电感耦合等离子体原子发射光谱法(ICP-AES)测定锌浮渣样品中Cd、As、Sb、Bi的化学分析方法。在确定的实验条件下,选择Cd 226.5 nm、As 189.0 nm、Sb 231.1 nm、Bi 190.1 nm为分析谱线,每个元素的校准曲线相关系数均大于0.999;同时对以上多种元素进行加标回收和精密度实验,结果表明其相对标准偏差(RSD,n=8)均小于2%,加标回收率为97.4%~103.2%。ICP-AES法操作简便、结果准确可靠,能够满足锌浮渣中多种元素精确测定的要求。 展开更多
关键词 锌浮渣 ICP-AES法 Cd As SB BI
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Preparation and Performance Study of PVA-Based Flexible Sensors
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作者 Md Kamrul Hasan Xinbo Ding 《Open Journal of Polymer Chemistry》 2024年第1期19-40,共22页
Flexible sensors have great potential for monitoring human body motion signals. This paper presents a flexible sensor that uses zinc oxide (ZnO) to improve the mechanical properties and electrical conductivity of PVA ... Flexible sensors have great potential for monitoring human body motion signals. This paper presents a flexible sensor that uses zinc oxide (ZnO) to improve the mechanical properties and electrical conductivity of PVA hydrogel. The composite hydrogel has excellent conductive properties and high strain sensitivity, making it suitable for motion monitoring. The PVA/ZnO conductive hydrogel is tested on various body parts, showing effective feedback on movement changes and good electrical signal output effects for different motion degrees, confirming its feasibility in flexible sensors. The sensor exhibits good mechanical properties, electrical conductivity, and tensile strain sensing performance, making it a promising sensor material. It can accurately monitor wrist bending, finger deformation, bending, and large-scale joint movements due to its wide monitoring range and recoverable strain. The results show that the PVA/ZnO conductive hydrogel can provide effective feedback in flexible sensors, which is suitable for use in motion monitoring. 展开更多
关键词 polyvinyl Alcohol zinc Oxide zinc Oxide Nanorods Conductive Hydrogel Flexible Sensor
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A 2D Wavy Parquet Architecture Based on the Biphenyl-3,3',4,4'-tetracarboxylic Acid and Bis(2-benzimidazole)alkanes Ligands 被引量:5
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作者 冯国栋 姜娈 +4 位作者 陈强 杨得锁 王敏娟 李宗孝 罗小林 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2013年第1期45-50,共6页
A double-T-shaped ligand (H4BPTC) and bis(2-benzimidazole)alkanes as the spacers have been firstly used to direct the assembly of a 2D coordination polymer with wavy parquet network topology, [Zn(BPTC)0.5(H2C2... A double-T-shaped ligand (H4BPTC) and bis(2-benzimidazole)alkanes as the spacers have been firstly used to direct the assembly of a 2D coordination polymer with wavy parquet network topology, [Zn(BPTC)0.5(H2C2EIm)(H2O)]n (1, C24H18ZnN4O5, Mr = 507.79, H4BPTC = biphenyl-3,3',4,4'-tetracarboxylic acid, H2C2EIm = 2,2'-(1,2-ethanediyl)-bis(1H-benzi- midazole), which was determined by single-crystal X-ray diffraction analysis. The crystal belongs to the monoclinic system, space group P21/n with a = 1.1844(5), b = 1.4019(5), c = 1.4026(5) nm, β = 108.359(5)°, V = 2.2104(15) nm3, Z = 4, Dc = 1.526 g/cm3, μ(MoKα) = 1.156 mm-1, F(000) = 1040, S = 1.038, the final R = 0.0427 and wR = 0.0793 for 3834 reflections with I 2σ(I). The compound units are linked through BPTC ligands into a wavilness parquet 2D layer and further connected into a 3D framework via π-π packing interactions between the adjacent H2C2EIm ligands and weak N-H…O hydrogen bonding between uncoordinated carboxylate and the nitrogen atoms of H2C2EIm as well as the free water molecules. 展开更多
关键词 synthesis crystal structure zinc(II) bis(2-benzimidazoles) double-T-shaped ligand
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Bis(L-Asparaginato)Zn(Ⅱ)掺Mn^(2+)晶体的g因子和零场分裂的理论研究(英文)
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作者 余萍 杜懋陆 段文倩 《西南民族大学学报(自然科学版)》 CAS 2010年第6期1024-1027,共4页
本文对Bis(L-asparaginato)Zinc(II):Mn2+晶体中Mn2+电子顺磁共振的g因子和零场分裂参量D、E,采用半自洽场3d轨道模型、点电荷模型和平均共价因子模型计算.理论计算数值与实验值符合很好.
关键词 bis(L-asparaginato)zinc(II):Mn2+晶体 D2h对称 g因子 零场分裂参量
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Synthesis, Crystal Structure and Properties of a New Zn(II) Coordination Polymer Constructed from 2,3-Pyridine Dicarboxylic Acid and 1,1′-(1,4-Butanediyl)bis(imidazole) 被引量:4
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作者 李书静 李可 +1 位作者 曲波涛 郑玮 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2014年第2期193-198,共6页
A new coordination polymer, namely [Zn(pdc)(bbi)]n {H2 pdc = 2,3-pyridine dicar- boxylic acid, bbi = 1,1-(1,4-butanediyl)bis(imidazole)}, has been prepared under hydrothermal conditions and characterized by el... A new coordination polymer, namely [Zn(pdc)(bbi)]n {H2 pdc = 2,3-pyridine dicar- boxylic acid, bbi = 1,1-(1,4-butanediyl)bis(imidazole)}, has been prepared under hydrothermal conditions and characterized by elemental analysis, IR, and single-crystal X-ray diffraction. It crystallizes in monoclinic, space group P21 /n with a = 8.436(3), b = 16.988(5), c = 12.106(4), β = 92.204(5)°, V = 1733.6(9)3, Z = 4, C17 H17 N5 O4 Zn, Mr = 420.73, Dc = 1.612 g/cm3, F(000) = 864, μ(MoKa) = 0.452 mm-1, the R = 0.0672 and wR = 0.1645. In the mononuclear complex, each Zn(II) is five-coordinated by one carboxylate O and one pyridyl N atoms from one pdc anion, one carboxylate O atom from another pdc anion, and two N atoms from two bib ligands. The Zn(II) ions are connected by pdc ligands to form skeleton chains, and bbi ligands further link them to construct a 2D framework. The thermal and luminescence properties of the complex were also investigated. 展开更多
关键词 2 3-pyridine dicarboxylic acid 1 1'-(1 4-butanediyi)bis(imidazole) zinc complex crystal structure thermal analysis luminescence
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Effect of doping Bi on oxygen evolution potential and corrosion behavior of Pb-based anode in zinc electrowinning 被引量:5
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作者 赖延清 衷水平 +4 位作者 蒋良兴 吕晓军 陈佩如 李劼 刘业翔 《Journal of Central South University》 SCIE EI CAS 2009年第2期236-241,共6页
A new anodic material of ternary Pb-0.8%Ag-(0-5.0%)Bi alloy for zinc electrowinning was obtained by doping Bi.The anodic oxygen evolution potential,corrosion rate,surface products after polarization,and microstructure... A new anodic material of ternary Pb-0.8%Ag-(0-5.0%)Bi alloy for zinc electrowinning was obtained by doping Bi.The anodic oxygen evolution potential,corrosion rate,surface products after polarization,and microstructures before and after polarization were studied and compared with those of Pb-0.8%Ag anode used in industry.The results show the anodic overpotential decreases with the increase of Bi content in the alloys.When the content of Bi is 1.0%(mass fraction),the anodic overpotential is 40-50 mV lower than that of Pb-0.8%Ag anode.While the corrosion rate decreases and then increases with the increase of Bi content.The Pb-0.8%Ag-0.1%Bi anode has the lowest corrosion rate(0.090 6 mg/(h·cm2).Doping Bi influences the structure of the anodic layer,but does not change the phase.The Pb-0.8%Ag-1.0%Bi anode layer is of a more fine-grained structure compared with Pb-0.8%Ag anode. 展开更多
关键词 Pb-Ag anode doping Bi zinc electrowinning oxygen evolution potential corrosion rate
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Solvent extraction of zinc from zinc sulfate solution 被引量:2
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作者 龙怀中 柴立元 +1 位作者 覃文庆 唐双华 《Journal of Central South University》 SCIE EI CAS 2010年第4期760-764,共5页
The extraction of zinc from zinc sulfate solution was investigated, using 20% saponified D2EHPA as an extractam and 260^# sulfonate kerosene as a diluent. The solution was stirred for 8 min at phase ratio (Vσ/Va) o... The extraction of zinc from zinc sulfate solution was investigated, using 20% saponified D2EHPA as an extractam and 260^# sulfonate kerosene as a diluent. The solution was stirred for 8 min at phase ratio (Vσ/Va) of 1.0:1.0, initial pH of 2.0 and stirring speed of 200 r/min. The results show that 75% zinc can be extracted from the zinc sulfate solution when the concentration of zinc is 18.7 g/L after being settled for 10 min. 88.60% zinc can be stripped by 196 g/L sulfuric acid, and zinc ion can be separated from ferric ion. 展开更多
关键词 zinc sulfate solution saponified bi(2-ethylhexyl) phosphoric acid (D2EHPA) zinc solvent extraction
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3D hollow sphere Co_3O_4/MnO_2-CNTs:Its high-performance bi-functional cathode catalysis and application in rechargeable zinc-air battery 被引量:2
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作者 Xuemei Li Nengneng Xu +3 位作者 Haoran Li Min Wang Lei Zhang Jinli Qiao 《Green Energy & Environment》 SCIE 2017年第3期316-328,共13页
There has been a continuous need for high active, excellently durable and low-cost electrocatalysts for rechargeable zinc-air batteries. Among many low-cost metal based candidates, transition metal oxides with the CNT... There has been a continuous need for high active, excellently durable and low-cost electrocatalysts for rechargeable zinc-air batteries. Among many low-cost metal based candidates, transition metal oxides with the CNTs composite have gained increasing attention. In this paper, the 3-D hollow sphere MnO_2 nanotube-supported Co_3O_4 nanoparticles and its carbon nanotubes hybrid material(Co_3 O_4/MnO_2-CNTs) have been synthesized via a simple co-precipitation method combined with post-heat treatment. The morphology and composition of the catalysts are thoroughly analyzed through SEM, TEM, TEM-mapping, XRD, EDX and XPS. In comparison with the commercial 20% Pt/C, Co_3O_4/MnO_2,bare MnO_2 nanotubes and CNTs, the hybrid Co_3O_4/MnO_2-CNTs-350 exhibits perfect bi-functional catalytic activity toward oxygen reduction reaction and oxygen evolution reaction under alkaline condition(0.1 M KOH). Therefore, high cell performances are achieved which result in an appropriate open circuit voltage(~1.47 V),a high discharge peak power density(340 mW cm^(-2)) and a large specific capacity(775 mAh g^(-1) at 10 mA cm^(-2)) for the primary Zn-air battery, a small charge-discharge voltage gap and a high cycle-life(504 cycles at 10 mA cm^(-2) with 10 min per cycle) for the rechargeable Zn-air battery. In particular, the simple synthesis method is suitable for a large-scale production of this bifunctional material due to a green, cost effective and readily available process. 展开更多
关键词 Bi-functional catalyst Oxygen reduction reaction Oxygen evolution reaction Activity and stability Rechargeable zinc-air battery
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Synthesis,Crystal Structure and Photoluminescence of a Three-dimensional Zinc(Ⅱ) Coordination Polymer with(20~3)_2(20)_3 Topology
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作者 苟蕾 张红霞 +2 位作者 樊小勇 李东林 李力 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2010年第9期1394-1398,共5页
The title compound,[Zn2(H2C4BIm)(ox)2]·2H2O(1,H2C4BIm = 2,2'-(1,4-bu-tanediyl)bis(1H-benzimidazole),has been synthesized by the hydrothermal reaction of Zn(NO3)2·6H2O with H2C4BIm and Na2C2O4 in ... The title compound,[Zn2(H2C4BIm)(ox)2]·2H2O(1,H2C4BIm = 2,2'-(1,4-bu-tanediyl)bis(1H-benzimidazole),has been synthesized by the hydrothermal reaction of Zn(NO3)2·6H2O with H2C4BIm and Na2C2O4 in water solution.It crystallizes in the triclinic system,space group P1 with a = 9.445(9),b = 9.598(9),c = 14.962(14) ,α = 72.160(10),β = 79.905(12),γ = 83.680(11)°,Mr = 633.18,V = 1269(2) 3,Z = 2,Dc = 1.657 g/cm3,F(000) = 644,μ = 1.953 mm-1,the final R = 0.0671 and wR = 0.1689.X-ray crystal structure analysis revealed that 1 is a 3D network with(203)2(20)3 topology in which the ZnII atom can be considered as a 3-connected node and both ox2-and H2C4BIm serve as the linear linkers. 展开更多
关键词 zinc(Ⅱ) complex crystal structure bis(benzimidazole) OXALATE luminescent property
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Two Metal-organic Coordination Polymers with Rigid Bis(triazole) Ligand: Assembly, Structures, and Fluorescence Properties
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作者 张旭 赵艳琴 +1 位作者 王福生 董桂英 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2016年第5期765-773,共9页
Two new coordination polymers containing rigid bis(triazole), namely, [Ni(btb)_(0.5)(nph)(H_2O)]_n(1) and [Zn(btb)(SO_4)]_n(2)(btb = 4,4a-bis(1,2,4-triazolyl-1-yl)-biphenyl, H_2nph = 3-nitrophthal... Two new coordination polymers containing rigid bis(triazole), namely, [Ni(btb)_(0.5)(nph)(H_2O)]_n(1) and [Zn(btb)(SO_4)]_n(2)(btb = 4,4a-bis(1,2,4-triazolyl-1-yl)-biphenyl, H_2nph = 3-nitrophthalic acid) have been synthesized and characterized by elemental analysis, IR spectra, and single-crystal X-ray diffraction. Complex 1 shows a 3D trinodal(3,4,4)-connected sqc69 topology. Complex 2 presents a 2D uninodal 4-connected sql network, which is further packed into a 3D supramolecular framework by C-H···O hydrogen bonds. Thermal stabilities and fluorescence properties of two complexes have been discussed in detail. 展开更多
关键词 bis(triazole) ligand crystal structure nickel(Ⅱ) coordination polymer fluorescence zinc(Ⅱ) coordination polymer
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Synthesis,Structure and Luminescent Properties of [Zn(btzb)_2Cl_2]·2H_2O [btzb=1,2-Bis(5-tetrazolyl)benzene]
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作者 刘东 陈阳 +3 位作者 李红喜 任志刚 张勇 郎建平 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2008年第3期335-339,共5页
The title compound [Zn(btzb)2Cl2]·2H2O (1·2H2O, btzb = 1,2-bis(5-tetrazolyl)ben- zene) was synthesized in situ by the [2+3] cycloaddition reaction of phthalonitrile with NaN3 in water in the presence ... The title compound [Zn(btzb)2Cl2]·2H2O (1·2H2O, btzb = 1,2-bis(5-tetrazolyl)ben- zene) was synthesized in situ by the [2+3] cycloaddition reaction of phthalonitrile with NaN3 in water in the presence of ZnCl2 under refluxing conditions. 1·2H2O crystallizes in the monoclinic system, space group P2 1/c with a = 9.0119(18), b = 7.5566(15), c = 18.076(5)A, β= 114.67(2)°, V= 1118.6(4)A^3, Z = 2, Dc = 1.784 g/cm^3, T= 223(2) K, C16H16N16O2Cl2Zn, Mr = 600.74, F(000) = 608, μ(MoKα) = 1.393 mm^-1, S = 1.081, R = 0.0306 and wR = 0.0669 for 1896 observed reflections with I 〉 2σ(I). The Zn^2+ ion of 1 is coordinated by four N atoms from two btzb ligands and two Cl atoms, forming a distorted octahedral coordination geometry. A number of intermolecular hydrogen bon- ding interactions between molecules 1 and/or the solvated water molecules result in a 3D hydrogen-bonded structure. The luminescent property of 1·2H2O was also investigated. 展开更多
关键词 zinc(II) complex 1 2-bis(5-tetrazolyl)benzene SYNTHESIS crystal structure luminescent properties
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