共查询到20条相似文献,搜索用时 13 毫秒
1.
以柔性1,3,5-三(4-羧酸苯氧基)苯(H3TCPB)为配体,以4,4''-联吡啶(4,4''-BPY)为辅助配体,在溶剂热条件下合成了2个新颖的分别具有三核锌簇和三核钴簇的金属有机骨架化合物:{[Zn3(TCPB)2(4,4''-BPY)]·DMF·3H2O}n(1)和{[Co1.5(TCPB)(DMF)(H2O)]·DMF}n(2),通过单晶X射线衍射,红外光谱,元素分析,热重分析和粉末X射线衍射对其结构进行了表征。单晶X射线衍射分析表明化合物1属于三斜晶系,P1空间群,表现出三维(3,8)连接的网状结构,拓扑符号为:{43}2·{46·618·84}·{6};化合物2也属于三斜晶系,P1空间群,为二维(3,6)连接的网络层状结构,拓扑符号为:{43}4·{46·618·84}。此外,荧光性质研究表明固态化合物1在室温条件下发射出源于TCPB3-和4,4''-BPY配体的淡蓝色荧光,而化合物2在相似的条件下没有荧光发射。 相似文献
2.
以5-(1H-咪唑)异酞酸(H2L)为配体,在水热条件下合成了3个金属有机框架化合物:[PrL(HL)(H2O)2]·H2O (1),Er(H0.5L)2 (2)和[CoL(H2O)2]·H2O (3)。单晶X-射线衍射测试结果表明,3个化合物都属于单斜晶系,P21/c空间群。化合物1中,Pr3+为九配位,而化合物2和3中,Er3+和Co2+均为六配位。在镧系配合物1和2中,配体中氮原子未参与配位。1为2D折叠形结构,2为3D框架结构。在过渡金属配合物3中,氮原子与Co2+配位,这有助于形成平面二维结构。化合物1和3通过分子间π-π堆积,进一步形成3D结构。3个化合物均展现出较好的热稳定性。 相似文献
3.
以5-(1H-咪唑)异酞酸(H2L)为配体,在水热条件下合成了3个金属有机框架化合物:[PrL(HL)(H2O)2]·H2O(1),Er(H0.5L)2(2)和[CoL(H2O)2]·H2O(3)。单晶X-射线衍射测试结果表明,3个化合物都属于单斜晶系,P21/c空间群。化合物1中,Pr3+为九配位,而化合物2和3中,Er3+和Co2+均为六配位。在镧系配合物1和2中,配体中氮原子未参与配位。1为2D折叠形结构,2为3D框架结构。在过渡金属配合物3中,氮原子与Co2+配位,这有助于形成平面二维结构。化合物1和3通过分子间π-π堆积,进一步形成3D结构。3个化合物均展现出较好的热稳定性。 相似文献
4.
分别以2种硝基羧酸配体EBNB(1,2-二(3-硝基苯甲酸)-乙烯)和NPA(3-硝基邻苯二甲酸)与BPY(4,4′-联吡啶)及金属锌反应,配位溶剂热法合成了2种具有硝基基团修饰的二核金属簇为基本构筑单元的金属有机框架化合物[Zn2(EBNB)2(BPY)2·2H2O]n(1)和[Zn2(NPA)2(BPY)2·H2O]n(2)。通过X-射线单晶衍射法测定了2种配合物的结构,其中配合物1属于三斜晶系,P1空间群,a=0.818 62(9)nm,b=1.142 20(14)nm,c=1.428 63(17)nm,α=96.803 0(10)°,β=93.045 0(10)°,γ=102.472(2)°,V=1.290 8(3)nm3,Z=2,Mr=595.81,Dc=1.533 g·cm-3,μ=1.01 mm-1,F(000)=608,T=293(2)K;配合物2属于三斜晶系,P1空间群,a=1.154 06(14)nm,b=1.190 86(16)nm,c=1.459 52(19)nm,α=98.029(1)°,β=98.749(1)°,γ=113.579(2)°,V=1.771 9(4)nm3,Z=2,Mr=879.35,Dc=1.648 g·cm-3,μ=1.43 mm-1,F(000)=892,T=293(2)K。同时也对2种配合物的发光性能进行了测试,测试结果表明2种配合物具有较好的荧光性能。 相似文献
5.
分别以2种硝基羧酸配体EBNB(1,2-二(3-硝基苯甲酸)-乙烯)和NPA(3-硝基邻苯二甲酸)与BPY(4,4’-联吡啶)及金属锌反应,配位溶剂热法合成了2种具有硝基基团修饰的二核金属簇为基本构筑单元的金属有机框架化合物[Zn2(EBNB)2(BPY)2·2H2O]n(1)和[Zn2(NPA)2(BPY)2·H2O]n(2)。通过X-射线单晶衍射法测定了2种配合物的结构,其中配合物1属于三斜晶系,P1空间群,a=0.81862(9)nm,b=1.14220(14)nm,c=1.42863(17)nm,α=96.8030(10)°,β=93.0450(10)°,γ=102.472(2)°,V=1.2908(3)nm3,Z=2,Mr=595.81,Dc=1.533g·cm-3,μ=1.01mm-1,F(000)=608,T=293(2)K;配合物2属于三斜晶系,P1空间群,a=1.15406(14)nm,b=1.19086(16)nm,c=1.45952(19)nm,α=98.029(1)°,β=98.749(1)°,γ=113.579(2)°,V=1.7719(4)nm3,Z=2,Mr=879.35,Dc=1.648g·cm-3,μ=1.43mm-1,F(000)=892,T=293(2)K。同时也对2种配合物的发光性能进行了测试,测试结果表明2种配合物具有较好的荧光性能。 相似文献
6.
通过水热法及沉淀法,合成了纳微尺度铜金属有机框架催化剂。 通过FT-IR、TG及TEM等技术手段对其性能和结构进行了表征。 系统考察了催化剂、溶剂种类及用量、反应时间等因素对异丁香酚氧化制备香草醛的影响。 结果表明,用均苯三甲酸根(BTC)作配体时制备的催化剂Cu-BTC性能较佳。 以Cu-BTC为催化剂、30%(质量分数)H2O2为氧化剂、乙腈为介质,当n(异丁香酚):n(H2O2)=1:2.4时,50 ℃,反应8 h,异丁香酚转化率为94.4%,香草醛产率达到81.8%。 纳微尺度(粒径30~300 nm)Cu-BTC催化剂体现了良好的重复使用性能,连续反应5次,异丁香酚转化率保持在90%左右。 相似文献
7.
以硝酸锌和对苯二甲酸为反应物,N,N′-二甲基甲酰胺(DMF)为溶剂,用溶剂热法合成出结构稳定的对苯二甲酸-锌配位化合物(MOF-L)。并采用XRD、TG、低温N2吸附等测试手段对合成的MOF-L进行了表征。结果表明,样品的孔径分布均呈双峰型,孔结构主要由孔径小于1 nm的微孔和少量1.5~2.0 nm的超微孔组成,且小于0.7 nm的极微孔丰富;其表面在极微孔和超微孔范围存在两种吸附位。300 ℃煅烧的样品,Langmuir比表面积和单点总孔容分别为1 243 m2·g-1和0.46 cm3·g-1,在77 K、1.0 bar时的储氢容量为1.3wt%。400 ℃煅烧后,骨架扭曲坍塌,Langmuir比表面积、总孔容及储氢容量分别下降为1 113 m2·g-1、0.43 cm3·g-1和0.8wt%。 相似文献
8.
9.
Ashleigh M. Chester Dr. Celia Castillo-Blas Prof. Lothar Wondraczek Prof. David A. Keen Dr. Thomas D. Bennett 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(38):e202200345
Here, we propose the combination of glassy or crystalline metal-organic frameworks (MOFs) with inorganic glasses to create novel hybrid composites and blends.The motivation behind this new composite approach is to improve the processability issues and mechanical performance of MOFs, whilst maintaining their ubiquitous properties. Herein, the precepts of successful composite formation and pairing of MOF and glass MOFs with inorganic glasses are presented. Focus is also given to the synthetic routes to such materials and the challenges anticipated in both their production and characterisation. Depending on their chemical nature, materials are classified as crystalline MOF-glass composites and blends. Additionally, the potential properties and applications of these two classes of materials are considered, the key aim being the retention of beneficial properties of both components, whilst circumventing their respective drawbacks. 相似文献
10.
金属有机框架抗菌材料的研究进展 总被引:1,自引:0,他引:1
细菌耐药问题已经成为了中国乃至全球的重大公共健康威胁,设计合成新型抗菌材料以减少抗生素依赖成为当前化学化工、材料和生物医学领域中的重要研究课题.金属有机框架(Metal-organic frameworks, MOFs)材料是由有机配体和金属离子或团簇通过配位键自组装形成的多孔晶态材料,在气体吸附与分离、传感和催化等领域都扮演着重要角色.为了寻求更好应对细菌威胁的方式方法,国内外研究者们纷纷构建出不同结构的MOFs材料,并将其应用于抗菌领域.本综述从细菌耐药性的产生和MOFs抗菌机理等方面出发,分类概述了不同金属中心和配体MOFs材料、MOFs包覆金属纳米粒子材料和药物缓释MOFs材料等在抗菌、促进伤口愈合等方面的应用,归纳概括了MOFs材料在抗菌领域应用中仍需解决的科学问题,并对该领域的发展趋势进行了展望. 相似文献
11.
金属-有机框架材料在气体吸附/分离方面具有广泛的应用, 因而引起国内外学者的广泛关注。本文以6种代表性的MOFs为例简单介绍了利用理论工具研究MOFs孔结构的方法。 相似文献
12.
金属-有机框架材料在气体吸附/分离方面具有广泛的应用,因而引起国内外学者的广泛关注。本文以6种代表性的MOFs为例简单介绍了利用理论工具研究MOFs孔结构的方法。 相似文献
13.
Two new complexes,[Zn(L1)2(SCN)2]·H2O(1,L1 = 3,5-dimethyl-4-p-tolyl-4H1,2,4-triazole and [Cd3(L2)6(SCN)6](2,L2 = 3,5-dimethyl-4-phenyl-4H-1,2,4-triazole),have been hydrothermally prepared and characterized by single-crystal X-ray diffraction,IR spectroscopy,elemental analysis and PXRD.Complex 1 crystallizes in monoclinic,space group P21 /n with a = 11.246(13),b = 9.640(11),c = 26.13(3),β = 100.97(3),V = 1108.5(3) 3,Z = 4,C24 H28 N8 OS2 Zn,Mr = 572.02,Dc = 1.366 g/cm3,μ = 1.065 mm-1,S = 0.992,F(000) = 1184,the final R = 0.0602 and wR = 0.1700 for 2925 observed reflections(I 2σ(I)).Complex 2 crystallizes in triclinic,space group P1 with a = 11.6669(3),b = 12.0957(2),c = 14.3674(3),α = 105.380(3),β = 91.020(2),γ = 92.4100(10)o,V = 1952.30(7)3,Z = 1,C66H66N24S6Cd3,Mr = 1725.08,Dc = 1.467 g/cm3,μ = 1.025 mm-1,S = 1.037,F(000) = 870,the final R = 0.0336 and wR = 0.0946 for 7819 observed reflections(I 2σ(I)).In the title complexes,complex 1 is a mononuclear molecule where the centre Zn(II) coordinates to two 3,4,5-substituted 1,2,4-triazole ligands(L1) and two terminal SCN-anions in a tetrahedral environment while six-coordinated centre Cd(II) atoms with octahedral geometry in complex 2 are bridged by virtue of substituted 1,2,4-triazole(L2) in N1,N2-bridging mode and μ2-N,N-SCN-anions into a trinuclear molecule. 相似文献
14.
Dibya Prakash Biswal Dipankar Singha Dr. Jagannath Panda Dr. Malay Kumar Rana 《Chemphyschem》2023,24(21):e202300311
UiO-66-NH2-IM, a fluorescent metal-organic framework (MOF), was synthesized by post-synthetic modification of UiO-66-NH2 with 2-imidazole carboxaldehyde via a Schiff base reaction. It was examined using various characterization techniques (PXRD, FTIR, NMR, SEM, TGA, UV-Vis DRS, and photoluminescence spectroscopy). The emissive feature of UiO-66-NH2-IM was utilized to detect volatile organic compounds (VOCs), metal ions, and anions, such as acetone, Fe3+, and carbonate (CO32−). Acetone turns off the high luminescence of UiO-66-NH2-IM in DMSO, with the limit of detection (LOD) being 3.6 ppm. Similarly, Fe3+ in an aqueous medium is detected at LOD=0.67 μM (0.04 ppm) via quenching. On the contrary, CO32− in an aqueous medium significantly enhances the luminescence of UiO-66-NH2-IM, which is detected with extremely high sensitivity (LOD=1.16 μM, i. e., 0.07 ppm). Large Stern-Volmer constant, Ksv, and low LOD values indicate excellent sensitivity of the post-synthetic MOF. Experimental data supported by density functional theory (DFT) calculations discern photo-induced electron transfer (PET), resonance energy transfer (RET), inner filter effect (IFE), or proton abstraction as putative sensing mechanisms. NMR and computational studies propose a proton abstraction mechanism for luminescence enhancement with CO32−. Moreover, the optical behavior of the post-synthetic material toward analytes is recyclable. 相似文献
15.
Xia Li Wenjie Zhao Yue Zhang Yu Zhang Jinting Tan Yingli Lu Xing Feng Prof. Dr. Xuwu Yang 《无机化学与普通化学杂志》2012,638(5):785-790
Two novel coordination polymers based on mixed ligands, [Zn(dpb)(bdc)(H2O)]n ( 1 ) and [Cd(dpb)(bbdc)(H2O)(DMF)]n ( 2 ) [dpb = 1, 4‐bis(pyridin‐3‐ylmethoxy)benzene, H2bdc = 1, 4‐benzenedicarboxylate, H2bbdc = 4, 4′‐dibenzenedicarboxylate], were synthesized under hydrothermal conditions. Compound 1 forms meso‐helical chain and shows three fold interpenetrating architecture with 4‐connected net {6 6} diamond topology. Compound 2 is a left‐ and right‐handed helical layer, which are interacted by π–π stacking interactions to construct a 3D framework. The luminescent properties of the compounds are discussed. 相似文献
16.
Vasudeva Rao Bakuru Marilyn Esclance DMello Prof. Dr. Suresh Babu Kalidindi 《Chemphyschem》2019,20(10):1177-1215
Hydrogen is in limelight as an environmental benign alternative to fossil fuels from few decades. To bring the concept of hydrogen economy from academic labs to real world certain challenges need to be addressed in the areas of hydrogen production, storage, and its use in fuel cells. Crystalline metal-organic frameworks (MOFs) with unprecedented surface areas are considered as potential materials for addressing the challenges in each of these three areas. MOFs combine the diverse chemistry of molecular linkers with their ability to coordinate to metal ions and clusters. The unabated flurry of research using MOFs in the context of hydrogen energy related activities in the past decade demonstrates the versatility of this class of materials. In the present review, we discuss major strategical advances that have taken place in the field of “hydrogen economy and MOFs” and point out issues requiring further attention. 相似文献
17.
相对于微孔金属有机骨架化合物,中孔金属有机骨架化合物的研究大大拓宽了该类材料的应用,尤其是在多相催化、挥发性有机物吸附和药物输送等领域。目前存在的问题主要集中在材料制备环节,尽管可以从分子水平设计出具有合适尺寸的中孔金属有机骨架材料,但是会出现合成过程中骨架结构发生贯穿无法得到中孔,甚至样品活化过程中骨架发生坍塌失去中孔等问题。本文综述了中孔金属有机骨架材料的设计策略与制备方法,如使用长配体、混合配体、表面活性剂辅助及后合成修饰等方法,并对各种制备方法的优缺点进行了总结。简要介绍了中孔金属有机骨架材料在气体存储、多相催化、分子传感、挥发性有机物吸附和药物载体等领域的应用进展,最后展望了该材料的发展前景。 相似文献
18.
19.
Bacterial biofilms are difficult to treat due to their resistance to traditional antibiotics. Although photodynamic therapy (PDT) has made significant progress in biomedical applications, most photosensitizers have poor water solubility and can thus aggregate in hydrophilic environments, leading to the quenching of photosensitizing activity in PDT. Herein, a benzoselenadiazole-containing ligand was designed and synthesized to construct the zirconium (IV)-based benzoselenadiazole-doped metal-organic framework (Se-MOF). Characterizations revealed that Se-MOF is a type of UiO-68 topological framework with regular crystallinity and high porosity. Compared to the MOF without benzoselenadiazole, Se-MOF exhibited a higher 1O2 generation efficacy and could effectively kill Staphylococcus aureus bacteria under visible-light irradiation. Importantly, in vitro biofilm experiments confirmed that Se-MOF could efficiently inhibit the formation of bacteria biofilms upon visible-light exposure. This study provides a promising strategy for developing MOF-based PDT agents, facilitating their transformation into clinical photodynamic antibacterial applications. 相似文献