蒽醌基金属-有机笼光氧化性能

将光活性蒽醌配体L¹和L²（L¹=N²,N⁷-双（（2,2''-联吡啶）-5-基）-9,10-蒽醌-2,7-双酰胺,L²=N²,N⁷-双（4-（（2,2''-联吡啶）-5-基）苯基）-9,10-蒽醌-2,7-双酰胺）与锌离子和亚铁离子通过配位自组装构筑得到一系列配合物1-Zn、2-Zn和2-Fe,单晶X射线衍射和电喷雾质谱等表征表明这一系列配合物为“2+3”的M₂L₃型金属-有机超分子结构。将蒽醌基金属-有机笼1-Zn与2-Zn应用于甲苯光催化氧化反应中,结果表明笼状催化剂和底物分子间形成超分子主客体化合物是其能有效氧化甲苯的关键。通过对芳香醇的光氧化反应进一步探究1-Zn与2-Zn的光氧化性能,实验结果表明催化产率受到取代基的电子效应和底物分子的尺寸的影响。     

三个二羧酸配体配位聚合物的合成、结构表征和荧光性质

以羧酸配体 2,2''-(1,4-亚苯基双(亚苯基))双(硫二基)二苯甲酸(H₂L¹)和 2,2''-(2,3,5,6-四甲基-1,4-亚苯基)双(亚甲基）双(硫二基)二苯甲酸(H₂L²)分别与金属盐反应,通过溶剂热方法合成了 3个配位聚合物：{[Ni(L¹)(H₂O)₄]·2H₂O}_n (1)、[Zn(L¹)(DMA)₂]_n(2)和[Co(L²)(DMF)₂]_n (3),其中DMA=N,N-二甲基乙酰胺,DMF=N,N-二甲基甲酰胺。对配合物1~3进行了单晶X射线衍射、元素分析、红外光谱、热重分析、粉末X射线衍射和固体紫外可见光谱测试和表征。单晶X射线衍射表明：3个配合物均为一维锯齿形链状结构,并通过氢键作用形成三维骨架,且配体均表现为反式构象。此外,对配合物2固态荧光性质进行了研究。     

三个二羧酸配体配位聚合物的合成、结构表征和荧光性质

以羧酸配体2,2''-（1,4-亚苯基双（亚甲基））双（硫二基）二苯甲酸（H₂L¹）和2,2''-（2,3,5,6-四甲基-1,4-亚苯基）双（亚甲基）双（硫二基）二苯甲酸（H₂L²）分别与金属盐反应,通过溶剂热方法合成了3个配位聚合物：{[Ni（L¹）（H₂O）₄]·2H₂O}_n （1）、[Zn（L¹）（DMA）₂]_n （2）和[Co（L²）（DMF）₂]_n （3）,其中DMA=N,N-二甲基乙酰胺,DMF=N,N-二甲基甲酰胺。对配合物1~3进行了单晶X射线衍射、元素分析、红外光谱、热重分析、粉末X射线衍射和固体紫外可见光谱测试和表征。单晶X射线衍射表明：3个配合物均为一维锯齿形链状结构,并通过氢键作用形成三维骨架,且配体均表现为反式构象。此外,对配合物2固态荧光性质进行了研究。     

基于2-(4-甲基苯甲酰基)苯甲酸及2，2'-联吡啶的双核铜(Ⅱ)配合物的晶体结构、荧光和磁性

以2-(4-甲基苯甲酰基)苯甲酸(HL)及2,2'-联吡啶(2,2'-bipy)为配体合成了一个双核铜(Ⅱ)配合物[Cu₂(L)₄(2,2'-bipy)₂]·H₂O(1),并对其进行了晶体结构测定。测定结果表明,该配合物晶体属于三斜晶系,空间群为P1,晶胞参数：a=1.01257(15)nm,b=1.3125(2)nm,c=1.3170(2)nm,α=82.985(2)°,β=76.437(2)°,γ=88.290(2)°,V=1.6887(4)nm³,D_c=1.391g·cm^-3,Z=2,F(000)=732,GooF=1.027,最终偏离因子R₁=0.0375,wR₂=0.0914。在配合物分子中相邻的2个铜(Ⅱ)离子通过2个2-(4-甲基苯甲酰基)苯甲酸根桥联配位连接起来,其端位各与1个2-(4-甲基苯甲酰基)苯甲酸根和1个2,2'-联吡啶分子配位,整个分子形成了双核结构。测定了标题配合物的荧光和磁性,结果表明：当激发波长为608nm时,配合物在472和476nm处有2个较强的荧光发射峰;在2~100K,配合物具有顺磁性。     

芳酰腙铜(Ⅱ)和锌(Ⅱ)配合物的合成、晶体结构及抗菌活性

合成了一对结构类似的双核铜和锌配合物,Cu₂(L¹)₂ (1)和[Zn₂(L²)₂(CH₃OH)₂] (2),其中L¹和L²分别是2-溴-N'-(2-羟基-5-甲基苯亚甲基)苯甲酰肼(H₂L¹)和2-氯-N'-(2-羟基-5-甲基苯亚甲基)苯甲酰肼(H₂L²)的二价阴离子,通过元素分析、红外光谱以及单晶X射线衍射表征了它们的结构.配合物1以三斜晶系P1空间群结晶,其晶体学参数:a=0.914 11(6) nm,b=1.180 04(7) nm,c=1.359 36(9) nm,α=101.928(2)°,β=91.399(2)°,γ=107.873(2)°,V=1.359 3(2) nm3,Z=2,R₁=0.054 0,wR₂=0.118 9,GOF=0.970.配合 物2以单斜晶系P21/c空间群结晶,其晶体学参数:a=1.216 97(9) nm,b=1.214 96(9) nm,c=1.212 83(9) nm,β=110.939(1)°,V=1.674 8(2) nm3,Z=2,R₁=0.034 1,wR₂=0.068 9,GOF=1.024.X射线分析表明2个化合物都是中心对称的双核配合物,其中配合物1中的Cu原子是平面正方形配位构型,配合物2中的Zn原子是四方锥配位构型.还通过MTT法研究了这两个配合物的抗细菌(大肠杆菌,金黄色葡萄球菌,枯草芽孢杆菌和铜绿色假单胞菌)和抗真菌(白假丝酵母菌和黑曲霉菌)活性.     

双烷氧桥联的双核铜(Ⅱ)Schiff碱配合物的合成及配合行为

通过Salen型双肟配体H₂L¹(H₂L¹=5,5′-二(N,N′-二乙胺)-2,2′-[乙二氧双(氮次甲基)]二酚)与乙酸铜反应,合成了一种双核铜(Ⅱ)配合物[Cu₂(L²)₂](H₂L²=4-(N,N′-二乙胺)水杨醛O-(2-羟乙基)肟),并对其进行了X-射线衍射单晶结构分析。     

芳酰腙铜(Ⅱ)和锌(Ⅱ)配合物的合成、晶体结构及抗菌活性

合成了一对结构类似的双核铜和锌配合物,Cu₂(L¹)₂(1)和[Zn₂(L²)₂(CH₃OH)₂] (2),其中L¹和L²分别是2-溴-N''-(2-羟基-5-甲基苯亚甲基)苯甲酰肼(H₂L¹)和2-氯-N''-(2-羟基-5-甲基苯亚甲基)苯甲酰肼(H₂L²)的二价阴离子,通过元素分析、红外光谱以及单晶X射线衍射表征了它们的结构。配合物1以三斜晶系P1空间群结晶,其晶体学参数:a=0.91411(6) nm,b=1.18004(7) nm,c=1.35936(9) nm,α=101.928(2)°,β=91.399(2)°,γ=107.873(2)°,V=1.3593(2) nm³,Z=2,R₁=0.0540,wR₂=0.1189,GOF=0.970。配合物2以单斜晶系P2₁/c空间群结晶,其晶体学参数:a=1.21697(9) nm,b=1.21496(9) nm,c=1.21283(9) nm,β=110.939(1)°,V=1.6748(2) nm³,Z=2,R₁=0.0341,wR₂=0.0689,GOF=1.024。X射线分析表明2个化合物都是中心对称的双核配合物,其中配合物1中的Cu原子是平面正方形配位构型,配合物2中的Zn原子是四方锥配位构型。还通过MTT法研究了这两个配合物的抗细菌(大肠杆菌,金黄色葡萄球菌,枯草芽孢杆菌和铜绿色假单胞菌)和抗真菌(白假丝酵母菌和黑曲霉菌)活性。     

3,6-二(N-咪唑/苯并咪唑基)哒嗪配体配合物的合成、结构、荧光及光催化性能

用溶剂热法设计、合成了4个金属-有机配合物[Mn(L¹)₄(OH)₂](1),{[MnL¹(H₂O)₄]SO₄}_n(2),[CdL²(NO₃)₂]_n(3)和{[Co(L²)₂](PF₆)₂}_n(4),(L¹=3,6-二(N-咪唑基)哒嗪,L²=3,6-二(N-苯并咪唑基)哒嗪),并通过元素分析、红外、X射线单晶衍射对配合物结构进行了表征,测试结果表明配合物1具有单核结构,2为一维链结构,配合物3和4均为二维网状结构。此外,对配合物3和4的固态荧光性能及光催化的性能做了进一步研究。     

O—P—O桥联锰-席夫碱配合物的合成、结构和磁性质

采用溶液法合成了2例由O—P—O单元桥联的锰-席夫碱(SB)新型三核配合物,即[Mn₃(salen)₃(L)]ClO₄·H₂O (1)和[Mn₃(salpn)₃(L)]ClO₄(2),其中salen^2-=N,N''-乙二胺缩双水杨醛,salpn^2-=N,N''-丙二胺缩双水杨醛,H₂L=(5-(乙氧基羰基)萘-1-基)膦酸。通过单晶X射线衍射、红外光谱、粉末X射线衍射对其进行了表征。配合物1和2是同构的,均是由膦酸酯配体中的O—P—O桥联3个[Mn (SB)]+构成一个三核结构单元[Mn3(SB)3(L)]⁺,一个无序的ClO₄^-作为平衡阴离子存在。这些[Mn₃(SB)₃(L)]⁺三聚体通过π-π相互作用和相邻的分子形成超分子一维波形链。配合物1和2的磁性研究表明,不对称结构中的3个Mn(Ⅲ)离子分别是2个高自旋和1个低自旋,而Mn(Ⅲ)离子之间主要存在反铁磁相互作用。     

三嗪吡唑类铜配合物的合成、结构及光谱研究

以三齿吡唑-三嗪(类蝎型)化合物2,4-二(3,5-二甲基吡唑)-6-二乙基胺-1,3,5-三嗪(bpz^*eaT)为配体,在无水乙醇和甲醇溶剂中,合成了2个配合物Cu₂(mpz^*eaT-EtO)₂(N₃)₂Cl₂(1)和Cu₂(mpz^*eaT-MeO)₂(N₃)₄(2)(mpz^*eaT-EtO：2-(3,5-二甲基吡唑)-4-乙醇-6-二乙基胺-1,3,5-三嗪;mpz^*eaT-MeO：2-(3,5-二甲基吡唑)-4-甲醇-6-二乙基胺-1,3,5-三嗪)。通过元素分析、红外光谱、紫外光谱、热重分析以及X-ray单晶衍射方法对配合物进行了表征,并分析了其光谱及结构特征。晶体结构表明,配合物1属于三斜晶系,P1空间群,a=0.9949(2)nm,b=1.0216(2)nm,c=1.1480(2)nm,α=115.11(3)°,β=106.99(3)°,γ=100.39(3)°,V=0.9460(3)nm³,Z=1;配合物2属于单斜晶系,P2₁/c空间群,a=1.5464(5)nm,b=1.4008(5)nm,c=0.8905(3)nm,β=103.227(5)°,V=1.8779(10)nm³,Z=2。配合物1和2中的中心铜原子均为五配位,形成扭曲的四角锥构型。     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

A carbanion induced synthesis of highly congested pyrazole and imidazole containing heterocycles

An efficient approach to the synthesis of highly congested di, penta and hexacyclic pyrazoles as well as imidazole fragment containing novel heterocyclic molecule has been developed through a carbanion induced transformation of suitably functionalized 2H-pyran-2-ones, benzo[h]chromene and thiochromeno[4,3-b]pyrans. Due to the presence of fluorescence, we report their prime application metal sensor as off/on switching in ferric ions.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Selective synthesis of 4,5-dihydroimidazo- and imidazo[1,5-a]quinoxalines via modified Pictet–Spengler reaction

An efficient tandem approach for the selective synthesis of 4,5-dihydroimidazo[1,5-a]quinoxalines 6a–g and imidazo[1,5-a]quinoxalines 7a–h by the reaction of 2-imidazolyl anilines 4a–c with aryl aldehydes 5a–k under mild reaction conditions is described. Introduction of electron releasing alkyl groups in substrates 4a–b was found to be instrumental for the success of the reaction.     

Understanding the Diels-Alder reactivity of 1,2-azaborine analogues

The Diels-Alder reactivity of 1,2-heteroborines (H₄C₄B(H)X, X?=?NH, PH, AsH; O, S, Se) has been computationally explored by means of Density Functional Theory (DFT) calculations. The influence of the HB?=?X fragment on the reactivity of the system has been quantitatively analyzed in detail by means of the so-called Activation Strain Model (ASM) of reactivity. It is found that the interaction between these species and the dienophile is significantly stronger than that computed for their all-carbon isoelectronic counterpart, benzene. In addition, the strain energy plays a key role in the observed reactivity trends. The role of the aromaticity strength of these heteroarenes on the reactivity is also assessed.