萘咪唑类稀土配合物的晶体结构和荧光性质

通过2-（2’-羟基-3’-甲氧基）萘咪唑（HL）和Ln（NO）3·6H₂O反应,合成了4种单核稀土配合物[Ln（HL）₂（NO₃）₃]·CH₂Cl₂（Ln=Sm（1）,Eu（2）,Tb（3））和[Ln（HL）₂（NO₃）₂（CH₃OH）]NO₃·CH₃OH（Ln=Yb（4））。X射线单晶衍射分析表明配合物1~4均通过配体萘环间的π-π作用呈现蝴蝶状结构。荧光性质表明仅有配合物4显示Yb³⁺稀土离子的特征发光,固态和在乙腈溶液中的荧光寿命分别为8.27 μs和4.40 μs。     

萘咪唑类稀土配合物的晶体结构和荧光性质

通过2-（2''-羟基-3''-甲氧基）萘咪唑（HL）和Ln（NO）₃·6H₂O反应,合成了4种单核稀土配合物[Ln（HL）₂（NO₃）₃]·CH₂Cl₂（Ln=Sm（1）,Eu（2）,Tb（3））和[Ln（HL）₂（NO₃）₂（CH₃OH）]NO₃·CH₃OH（Ln=Yb（4））。X射线单晶衍射分析表明配合物1~4均通过配体萘环间的π-π作用呈现蝴蝶状结构。荧光性质表明仅有配合物4显示Yb³⁺稀土离子的特征发光,固态和在乙腈溶液中的荧光寿命分别为8.27 μs和4.40 μs。     

1,10-邻菲啰啉和四氟对苯二甲酸构建的两个镍（Ⅱ）的配合物：合成和晶体结构

以醋酸镍、四氟对苯二甲酸（H₂tfbdc）及1,10-邻菲啰啉（phen）为原料在不同的反应条件下合成了2个镍(Ⅱ)的配合物{[Ni（phen）₂（Htfbdc）]2（μ-tfbdc）}·3H₂O（1·3H₂O）和[Ni（phen）₃]2（tfbdc）₂·13H₂O（2·13H₂O）。单晶结构分析显示配合物1·3H₂O中3D超分子结构在C-H…O/F和C-F…π弱相互作用下而成;在配合物2·13H₂O中,水分子和羧酸离子构建的三维氢键框架中含有金属有机离子链客体。此外,在这些3D超分子结构中强氢键作用、C-H…O和C-H…F等弱氢键作用,π…π及C-F/H…π作用均起到了稳定结构的作用。     

基于一个四羧酸配体构筑的具有(4,8)-连接的镧系金属-有机框架材料及对小分子的检测试验

以3,3'',5,5''-四-（羧基苯基）联苯为配体（H₄L）,与镧系金属Ln（Ⅲ）盐反应,自组装形成了5个具有三维孔洞结构的镧系金属-有机框架材料：{[Ln₃L₂(H₂O)₇]·(OH)·10DMA}_n(Ln=Gd (1a); Ln=Ho(2a), {[Ln₃L₂(H₂O)₃]·(OH)·mDMA}_n (Ln=Er,m=10(1b); Ln=Yb, m=9(2b); Ln=Lu, m=10(3b))。单晶X射线衍射分析表明,这些MOFs属于2种系列的类质同晶化合物,分别属于正交晶系Ccca空间群和单斜晶系C2/c空间群。有机小分子溶剂交换荧光研究发现,2b对小分子二氯甲烷和甲苯荧光有增强效应,表现出良好的荧光探测功能。     

两个氮氧双自由基桥连的稀土一维链的晶体结构、磁性和荧光性能

选用1,2-二苯氧基乙烷取代的氮氧双自由基（BNPhOEt）与稀土金属反应,得到了2例氮氧双自由基-稀土配合物[Ln（hfac）₃（BNPhOEt）]·C₆H₁₄（Ln=Tb（1）、Ho（2）;hfac=六氟乙酰丙酮）,其均为2p-4f一维链状结构。磁性研究表明,在配合物1和2中分别存在铁磁和反铁磁耦合。此外,对2个配合物的荧光光谱进行了研究分析。     

吡唑-3-甲酸Cu(Ⅱ)/Mn(Ⅱ)配合物的合成、表征及常压下对二氧化碳催化转化

合成和表征了2个吡唑-3-甲酸过渡金属配合物[Cu₂（pca）₂（H₂O）₆]·2H₂O（1）,[Mn（Hpca）₂（phen）]·3H₂O（2）（H₂pca=吡唑-3-甲酸;phen=菲咯啉）。X射线单晶衍射分析结果表明,配合物1属于单斜晶系P2₁/n空间群,它是一个畸变八面体的双核铜配合物;配合物2是一个畸变八面体的单核锰配合物。配合物1和2分别通过分子间的O-H…O,N-H…O氢键形成了三维网状结构。配合物1在二氧化碳的环加成反应中显示出了良好的催化效率（转化率高达97.4%;选择性高达98.9%）。     

基于2-(4'-羧基苯基)咪唑-4,5-二羧酸构筑的三个镉/锌配位聚合物的合成、拓扑结构、荧光光谱及DNA作用

以2-（4''-羧基苯基）咪唑-4,5-二羧酸（H₄CPhIDC,C₁₂H₈N₂O₆）为配体,用溶剂热合成了3种配位聚合物{[Cd₂（CPhIDC）（bimb）]·H₂O}_n（1）、{[Cd₂（CPhIDC）（phen）₂]·3H₂O}_n（2）、{[Zn₂（CPhIDC）（bpp）]·1.5H₂O}_n（3）（bimp=1,4-双咪唑基-丁烷,phen=1,10-菲咯啉,bpp=1,3-双（4-吡啶基）-丙烷）。用元素分析、红外光谱、粉末X射线衍射和单晶X射线衍射对配合物进行了表征和结构分析。结构分析表明,主配体以完全去质子化CPhIDC^4-的形式与中心金属离子形成以μ₄和μ₅为配位模式的二维及三维聚合物。配合物1和3是三维网络结构,同时呈现（3,4,5）-连接的（5·6·7）（4·5²·6·7²）（4·5²·6·7⁴·8²）拓扑结构,两者的不同之处是中心离子和辅助配体。配合物2是二维波纹状渔网结构,呈现4⁴·6²拓扑结构,在其空间填充上又类似于DNA双螺旋链的单螺旋结构。测定了产物的固体荧光光谱;用EtBr荧光探针法研究了配体及配合物与ct-DNA的相互作用。     

基于双吡啶脲类Cd(Ⅱ)、Zn(Ⅱ)、Hg(Ⅱ)配合物的合成及晶体结构

间苯二胺和3-吡啶异氰酸酯在甲苯中加热回流得到双吡啶脲类配体L,然后将配体分别与CdSO₄·8H₂O,ZnI₂,HgI₂,HgCl₂进行配位反应,得到4个配合物{[Cd（L）（SO₄）（H₂O）₃]·H₂O}_n（1）,{[Zn（L）I₂]·2C₂H₅OH}_n（2）,{[Hg（L）I₂]·C₂H₅OH}_n（3）,[Hg（L）Cl₂]·H₂O（4）,并用元素分析、FT-IR、X射线单晶衍射、粉末衍射对其进行了表征。配合物1形成一维螺旋链结构,配合物2和3形成一维“之”字链结构,配合物4形成32元环状结构。     

3,3''-(吡啶-3,5)二苯甲酸构筑的Co(Ⅱ)/Ni(Ⅱ)配合物的合成、晶体结构及性质

设计、合成了2个配合物：{[Co₂（pddb）₂（μ₂-H₂O）（H₂O）₂]·2DMA·5H₂O}_n（1）和{[Ni₂（pddb）₂（μ₂-H₂O）（H₂O）₂]·2DMA·5H₂O}_n（2）（H₂pddb=3，3''-（吡啶-3，5）二苯甲酸，DMA=N，N-二甲基乙酰胺），并通过红外光谱（IR），元素分析，热重分析（TG）和单晶X射线衍射确定它们的结构。结构分析表明1和2是异质同构的，其空间构型可简化成（3，6）连接的拓扑结构，其符号为（4²·6）·（4⁴·6²·8⁸·10）。进一步研究了配合物1和2的固体紫外、磁性及其催化性能。研究表明1和2中的中心金属离子之间存在反铁磁耦合作用，并且1可以作为C-H活化的高效非均相催化剂。     

三个金属-乳清酸配合物的合成、结构和氢键作用

嘧啶衍生物乳清酸作为一种生物小分子较少应用到金属-有机配合物的合成中。我们应用乳清酸与过渡金属盐反应,通过溶剂热方法合成了3个新颖的配合物：{[Cu（HOr）₂]·2NH₂（CH₃）₂}_n（R-1）、[Co₂（HOr）₂（bipy）（H₂O）₆]·2H₂O（R-2）和{[Ni₂（HOr）₂（1,3-dpp）₂（H₂O）₂][Ni（HOr）（1,3-dpp）（H₂O）]₂·（1,3-dpp）·2H₂O}_n（R-3）（H₃Or=orotic acid,bipy=4,4''-bipyridine,1,3-dpp=1,3-di（4-pyridyl）propane）。应用X射线单晶衍射、元素分析、红外衍射、热重分析等对配合物进行了结构分析和表征。X射线单晶衍射分析表明：R-1是具有2D层结构的单核配合物,R-2为简单的单分子配合物,R-3则是由层和链组成的复杂三明治结构。这3个配合物均能通过分子间的氢键作用连接成三维的框架结构。     

Tetrazole derivatives

It is shown that the frequencies of the long-wave band in the electronic spectra of tetrazolium salts correlate with Brown's electrophilic ⁺ constants. The color of the tetrazolium salts is due to a polar transition associated with transfer of charge from the phenyl ring attached to the N₃ atom to the central tetrazole ring.See [1] for Communication 23.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 111–114, January, 1980.     

Tetrazole derivatives

The formazan named in the title and its corresponding tetrazolium salt were synthesized. It is shown that both of these compounds are capable of cleavage to give two tetrazole fragments. Reaction products involving the ring and exocyclic nitrogen atoms are formed in the methylation of the formazan. The product from the exocyclic nitrogen atom on heating is converted to a leucoverdazyl radical, which is capable of undergoing oxidation to give the 1-(1-methyl-5-tetrasolyl)-3,5-diphenylverdazyl radical.See [1] for communication XII.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 266–269, February. 1977.     

Tetrazole derivatives

1-(5-Tetrazolyl)-3,5-diphenylverdazylium betaine was obtained by oxidation of the leuco base of 1-(5-tetrazolyl)-3,5-diphenylverdazyl under the influence of PbO₂ in acetone, whereas verdazylium nitrate, which is capable of undergoing conversion to the betaine, was obtained by oxidation with nitric acid. Both oxidation products in concentrated NaOH form the sodium salt of verdazyl, and the betaine adds perchloric acid to give verdazylium perchlorate.     

Tetrazole derivatives

A series of 1-(5-tetrazolyl)-3-phenyl-5-arylformazans, which are readily oxidized to brightly colored 2-(5-tetrazolyl)-3-aryl-5-phenyltetrazolium betaines in alkaline media, are obtained by coupling of arenediazonium salts containing strong electron-donor groups with 5-tetrazolylhydrazones. The formazans form deeply colored complexes with Ni²⁺, Cu²⁺, and Co²⁺ salts.     

Tetrazole derivatives

A series of 5-aryl-3-phenyl-1-(tetrazol-5-yl)formazans has been obtained by the azo coupling reaction. In an aqueous alkaline medium they are oxidized to tetrazolium salts with a betaine structure. Information is given on the electronic spectra of the formazans and the tetrazolium salts and the acidic properties and complex-forming capacity of the formazans.For Communication VII, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1570–1573, November 1973.     

Tetrazole derivatives

The polarographic reduction of tetrazolyl-containing tetrazolium salts with betaine structures and various substituents attached to the C(s) and N(s) atoms was investigated. It is shown that the depolarization of the tetrazolium salts proceeds in three electrochemically irreversible steps. In the first step one observes two-electron reduction to a formazan dianion without the consumption of protons. Electron-donor substituents facilitate the reduction, whereas electron-acceptor substituents hinder it. The substituent effect is manifested to a greater extent from the 3 position of the tetrazolium ring.See [1] for communication XVI.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1686–1690, December, 1977.     

Tetrazole derivatives

The corresponding leucoverdazyl and 1-methyl-5--benzoylhydrazidotetrazole are formed in the reaction of 1-(1-methyl-5-tetrazolyl)-3,5-diphenylformazan with formaldehyde in acidic media. 1,3-Diphenyl-1,2,4-triazole is formed when the reaction is carried out in alkaline media. According to the PMR spectral data, prototropic tautomerism is characteristic for the leucoverdazyl. The verdazyl radical derivative has the ability to undergo recyclization with conversion of the tetrazine ring to a triazole ring either spontaneously or when it is heated.Translated from Geterotsiklicheskikh Soedinenii, No. 8, pp. 1137–1140, August, 1978.     

Tetrazole derivatives.

A number of 5-tetrazolylhydrazones were synthesized and their physicochemical characteristics were studied.See [1] for communication XI.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 850–854, June, 1975.     

Synthesis of Nonracemic Tetrazole GABA Analogs

Russian Journal of Organic Chemistry - Nonracemic 3-substituted 4-(1H-tetrazol-1-yl)butanoic acids, analogs of the neurotropic drugs phenibut, tolibut, and baclofen, were synthesized by a...     

Theoretical Study on Tetrazole and its Derivatives (5) Ab Initio Study on Nitro Derivatives of Tetrazole

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