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1.
通过水热法,合成了2个基于轴手性配体2,2''-dinitro-4,4''-biphenyldicarboxylic acid(H2nbpdc)的配位聚合物[La(nbpdc)(phen)(FA)]n1),[Eu(nbpdc)(phen)(FA)]n2)(phen=菲咯啉,FA=甲酸根),并且对2个化合物进行了红外、单晶X射线衍射、热重、荧光、CD谱及介电性质的研究。晶体结构测试表明,2个化合物结晶在正交晶系P212121手性空间群,且具有相同的三维拓扑结构。荧光性质测定表明化合物12分别在606和 615.5 nm处有强的发射光谱。与此同时,固体CD谱测试进一步证实2个化合物具有手性。  相似文献   

2.
以1,4-二硝基苯甲酸(HL)和1,10-邻菲罗啉(phen)为配体,通过水热法与镧系金属盐合成了7个一维链状配位聚合物,其分子式为[Ce2L6(phen)2]n1)和[LnL3phen]n(Ln=Sm,2;Eu,3;Gd,4;Tb,5;Dy,6;Er,7)。由X-射线单晶衍射测定了化合物晶体结构,通过磁性以及荧光测试表征了部分化合物的磁性和荧光性质。  相似文献   

3.
徐涵  潘兆瑞  江蓉 《无机化学学报》2022,38(6):1133-1145
通过水热法合成并表征了3个基于V型配体构筑的新颖配位聚合物{[Cd(BIDPS)(PA)(H2O)]·CH3OH}n1)、{[Zn(BIDPS)(p-bdc)]·H2O}n2)和[Mn(BIDPT)(NBA)]n3)(BIDPS=4,4''-二(1-咪唑基)苯砜,H2PA=帕莫酸,p-H2bdc=对苯二甲酸,BIDPT=4,4''-二(1-咪唑基)苯硫醚,H2NBA=4,4''-氮杂二基二苯甲酸)。单晶结构分析表明化合物12具有二维网络结构,化合物1进一步通过倾斜穿插形成三维结构,化合物2通过分子间氢键形成了三维网络结构。化合物3属于3-连接六边形的蜂窝状结构,通过C—H …π作用形成三维超分子结构。化合物12在水中具有很好的稳定性和荧光性质,可作为高灵敏度、高选择性荧光探针检测水溶液中的Fe3+和Cr2O72-,并能抵抗多种竞争离子的干扰。同时研究了其对Fe3和Cr2O72-的荧光猝灭机理。  相似文献   

4.
在水热条件下,合成了2个配位聚合物{[Mn(Hbidc)(2,2''-bpy)(H2O)2]·1.5H2O}n1)和{[Cd(Hbidc)(phen)][Cd(phen)2Cl2]}n2)(H3bidc=苯并咪唑-5,6-二羧酸,2,2''-bpy=2,2''-联吡啶,phen=菲咯啉),并通过X射线单晶衍射、红外、元素分析、X射线粉末衍射和热重对配合物结构进行了表征。配合物1是一维无限zig-zag链结构,可以通过O-H…O和N-H…O氢键的相互作用形成三维超分子结构。配合物2也是一维无限链结构。此外,测试了配合物12的固体紫外吸收光谱和研究了配合物2的固体荧光性能。  相似文献   

5.
通过水热法,合成了2个基于轴手性配体2,2′-dinitro-4,4′-biphenyldicarboxylic acid(H_2nbpdc)的配位聚合物[La(nbpdc)(phen)(FA)]n(1),[Eu(nbpdc)(phen)(FA)]n(2)(phen=菲咯啉,FA=甲酸根),并且对2个化合物进行了红外、单晶X射线衍射、热重、荧光、CD谱及介电性质的研究。晶体结构测试表明,2个化合物结晶在正交晶系P2_12_12_1手性空间群,且具有相同的三维拓扑结构。荧光性质测定表明化合物1和2分别在606和615.5 nm处有强的发射光谱。与此同时,固体CD谱测试进一步证实2个化合物具有手性。  相似文献   

6.
在水热条件下,合成了2个配位聚合物{[Mn(Hbidc)(2,2''-bpy)(H2O)2]·1.5H2O}n1)和{[Cd(Hbidc)(phen)][Cd(phen)2Cl2]}n2)(H3bidc=苯并咪唑-5,6-二羧酸,2,2''-bpy=2,2''-联吡啶,phen=菲咯啉),并通过X射线单晶衍射、红外、元素分析、X射线粉末衍射和热重对配合物结构进行了表征。配合物1是一维无限zig-zag链结构,可以通过O-H…O和N-H…O氢键的相互作用形成三维超分子结构。配合物2也是一维无限链结构。此外,测试了配合物12的固体紫外吸收光谱和研究了配合物2的固体荧光性能。  相似文献   

7.
采用普通溶液法和水热法分别合成了2个金属-有机配位聚合物:{[Cu(Ts-5-AIPA)(phen)(H2O)]·H2O}n1)和[Cd(Ts-5-AIPA)(phen)]n2)(Ts-5-AIPA=N-对甲苯磺酰-5-氨基间苯二甲酸根,phen=菲咯啉),并用红外光谱、热重和X射线单晶衍射对配合物的结构进行了表征。结果表明:2个配合物均为单斜晶系,配合物1P21/c空间群,配合物2C2/c空间群;2个配合物均为一维链状结构,再通过氢键和π-π堆积作用形成三维超分子结构。另外,还研究了2个配位聚合物的荧光性质。  相似文献   

8.
采用水热方法,用半刚性三羧酸配体(H3cpta)和菲咯啉(phen)或2,2''-联吡啶(2,2''-bipy)与CoCl2·6H2O反应,合成了一个一维链状配位聚合物[Co(μ2-Hcpta)(phen)(H2O)]n1)和一个二维层状配位聚合物[Co3μ5-cpta)2(2,2''-bipy)2]n2),并对其结构和磁性质进行了研究。结构分析结果表明2个配合物均属于单斜晶系,P21/c空间群。配合物1具有一维链状结构,而且这些一维链状结构通过C-H…O氢键作用进一步形成了二维超分子网络。而配合物2具有由三核钴单元构筑的二维层状结构。研究表明,配合物12中相邻钴离子间存在反铁磁相互作用。  相似文献   

9.
采用水热方法,用醚氧桥联四羧酸配体(H4L)和菲咯啉(phen)、2,2''-联吡啶(2,2''-bipy)与CdCl2·H2O反应,合成了2个一维配位聚合物[Cd2μ5-L)(phen)2]n1)和{[Cd2μ4-L)(2,2''-bipy)2(H2O)2]·2H2O}n2),并对其结构和荧光性质进行了研究。结构分析结果表明2个配合物分别属于单斜和三斜晶系,P21/cP1空间群。聚合物12分别具有基于四核Cd4和Cd2单元的一维链结构。研究表明,配合物12在室温下能发出蓝色荧光。  相似文献   

10.
采用水热方法,用联苯三羧酸配体(H3btc)和菲咯啉(phen)或2,2''-联吡啶(2,2''-bipy)分别与CoCl2·6H2O、PbCl2和ZnCl2反应,合成了一个单核配合物[Co(Hbtc)(phen)2(H2O)]·3H2O(1)以及2个一维链状配位聚合物[Pb(μ3-Hbtc)(2,2''-bipy)]n2)和{[Zn3μ2-btc)2μ2-H2O)(2,2''-bipy)3(H2O)5]·8H2O}n3),并对其结构和荧光性质进行了研究。结构分析结果表明3个配合物分别属于正交和三斜晶系,Pna21P1空间群。配合物1具有零维单核结构,而且这些单核钴单元通过O-H…O氢键作用进一步形成了三维超分子框架。而配合物23具有基于双核单元的一维链结构。研究表明,配合物23在室温下能发出蓝色荧光。  相似文献   

11.
The photochemical reactions of the 2, 2, 4, 4-tetramethylcyclobutanones 1–6 carrying various substituents in 3-position were investigated. The major reaction in alcoholic solution or in the presence of other protic compounds was the formation of the semicyclic acetals 7–12 . Parallel to this reaction decarbonylation occurred, leading to stable cyclopropane derivatives in some cases, depending on the substituents present. Cyclopropanes with an exocyclic double bond underwent ring opening easily or, in case of an exocyclic carbon-nitrogen double bond, added alcohol, thus forming cyclopropane O, N-ketals. Alkyl-acyl biradicals are proposed as common intermediates for both photoreactions. Based on analogy to similar photoreactions reported in the literature, the formation of the semicyclic acetals is assumed to involve a carbene intermediate.  相似文献   

12.
About the Chloride Spinels Li2MgCl4, Li2MnCl4, Li2FeCl4, Li2CdCl4 FIR, Raman, and X-ray data of the spinel type chlorides Li2TCl4 (T = Mg, Mn, Fe, Cd) are presented. The vibrational spectra indicate that there is no 1:1 ordering on the octahedral sites of the lattice. Both DTA measurements and high temperature X-ray photographs show that the chloride spinels undergo a reversible phase transition to a cubic high temperature defect structure at 535°C (Li2MgCl4), 460°C (Li2MnCl4) and 385°C (Li2CdCl4), which has unit cell dimensions two times smaller than the spinel lattice. Disordering of the lithium sublattice still begins at much lower temperatures, as measurements of the electric conductivity indicate.  相似文献   

13.
High-temperature heat capacity measurements were obtained for Cr2O3, FeCr2O4, ZnCr2O4, and CoCr2O4 using a differential scanning calorimeter. These data were combined with previously available, overlapping heat capacity data at temperatures up to 400 K and fitted to 5-parameter Maier–Kelley Cp(T) equations. Expressions for molar entropy were then derived by suitable integration of the Maier–Kelley equations in combination with recent S(298) evaluations. Finally, a database of high-temperature equilibrium measurements on the formation of these oxides was constructed and critically evaluated. Gibbs free energies of Cr2O3, FeCr2O4, and CoCr2O4 were referenced by averaging the most reliable results at reference temperatures of (1100, 1400, and 1373) K, respectively, while Gibbs free energies for ZnCr2O4 were referenced to the results of Jacob [K.T. Jacob, Thermochim. Acta 15 (1976) 79–87] at T = 1100 K. Thermodynamic extrapolations from the high-temperature reference points to T = 298.15 K by application of the heat capacity correlations gave ΔfG(298) = (−1049.96, −1339.40, −1428.35, and −1326.75) kJ · mol−1 for Cr2O3, FeCr2O4, ZnCr2O4, and CoCr2O4, respectively.  相似文献   

14.
The addition of 4-phenyl-1, 2, 4-triazoline-3, 5-dione (I) to the pseudodienic system of 2-vinylpyridines leads to a new heterocyclic system — triazolo[l, 2-]-5-azacinnoline. A second molecule of I undergoes further reaction of the substitutive addition type.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 702–705, May, 1976.  相似文献   

15.
Preparation and Crystal Structure of BaAl2Se4, BaGa2Se4, CaGa2Se4, and CaIn2Te4 The new compounds BaAl2Se4, BaGa2Se4, CaGa2Se4 and CaIn3Te4 crystallize with constants see “Inhaltsübersicht”. The structures are strongly related to the TlSe structure.  相似文献   

16.
The water activities for aqueous solutions of Li2SO4(aq), Na2SO4(aq), K2SO4(aq), (NH4)2SO4(aq), and sulphates MgSO4(aq), MnSO4(aq), NiSO4(aq), CuSO4(aq), and ZnSO4(aq) were determined experimentally at a temperature of 298.15 K with a hygrometric method, at molalities in the range from 0.1 mol·kg−1 to saturation. The osmotic coefficients are calculated from these results. The coefficients of Pitzer’s model was used to fit the osmotic coefficients for each salt solution. These parameters were used to predict solute activity coefficients for the salts studied.  相似文献   

17.
2,2,4,4—四对羟甲基酚氧基—6,6—二苯基三聚磷腈的合成   总被引:10,自引:0,他引:10  
胡源  邵宗龙 《应用化学》1998,15(1):22-24
通过Friedel-Crafts反应,将本基引入到六氯环三磷腈上,然后由亲核取代反应和氢化还原反应,合成了2,2,4,4-四对羟甲基酚氧基-6,6-二苯基三聚磷腈,探索了各步的合成、分离方法,并对化合物的结构进行了表征.  相似文献   

18.
Population matrices have been calculated from molecular orbital wave functions of N2O4, B2Cl4, and B2F4 in order to understand further the bonding in these molecules which are isoelectronic in valence electrons but different in structure. C2H4 and C3H4 have been included in this study as check cases.
Zusammenfassung Ausgehend von Molekülorbitalen werden Besetzungsmatrizen für N2O4, B2Cl4 und B2F4 berechnet, um die Bindung in diesen Molekülen, die in den Valenzelektronen isoelektronisch sind, aber unterschiedliche Strukturen aufweisen, besser zu verstehen. C2H4 und C3H4 sind in dieser Untersuchung als Prüffälle eingeschlossen.

Résumé Des matrices d'occupation ont été calculées à partir des orbitales moléculaires de N2O4, B2Cl4 et B2F4, afin de comprendre plus profondément la liaison dans ces molécules, qui sont isoélectroniques par leurs électrons de valence, mais qui n'ont pas la même structure. C2H4 et C3H4 sont considérés dans cette étude à titre de vérification.
  相似文献   

19.
show the equilibrium structures to be the butterfly arrangement for the Cu2X2 clusters and the heterocubane arrangement for the Cu4X4 clusters.  相似文献   

20.
The new quaternary compounds Cs2AgVS4, K2AgVSe4, Rb2AgVSe4, Rb2AgNbS4, and Cs2AgNbSe4 were prepared using the reactive flux method. In this structure type infinite chains of edge-sharing AgQ4- and MVQ4-tetrahedra are running parallel to the crystallographic a-axis. The chains are separated by alkali cations. A linear relationship between the size of the alkali cation A+ and the Q–Q interchain distances was found. These compounds are isostructural with the analogous quaternary copper chalcogenides. The optical properties were studied by collecting UV/Vis transmission and reflectance spectra which allowed to derive the optical band gaps. The colours of the vanadium compounds range from black to dark violet with optical band gaps between 1.7 and 1.8 eV. In addition, the behaviour of the samples was studied using polarized light. Under these experimental conditions the niobium compound Rb2AgNbS4 changes its colour from green to red when the direction of the polarization plane is changed by 90°.  相似文献   

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