芳香碘基辅助的配位超分子自组装——锌(II)、镉(II)与7-碘-8-羟基喹啉-5-磺酸配合物的合成和结构

合成了锌 (II)、镉 (II)与 7 碘 8 羟基喹啉 5 磺酸 (IHQS)的两种单晶配合物 [Zn(IHQS) (H2 O) 3 ] 2 ·4H2 O ( 1)和 [Cd (IHQS) (H2 O) 2 ] n·2nH2 O ( 2 ) ,用X射线衍射法确定了结构 .结果表明 ,1和 2均由一对对映体配合物构成 :1中两个 [Zn (IHQS) (H2 O) 3 ]对映体通过磺酸基 -锌 (II)八面体轴向互补配位形成中心对称双分子聚合体 ,该聚合体通过分子间磺酸基氧 -配位水氢键形成独特的二维层状结构 ;2的两个 [Cd(IHQS) (H2 O) 2 ]对映体通过镉 (II) 磺酸基 -镉 (II)双向互补配位形成一维直线型聚合配位结构 .芳香碘基呈现新颖的碘 -芳环氢和碘 -磺酸基氧等弱相互作用模式 ,并对上述结构的支撑稳定发挥重要的结构辅助作用 .本文展示了芳香碘基、磺酸基和喹啉环三种弱相互作用基团在配位超分子自组装中的形状、空间匹配和协同促进模式 .结晶学参数配合物 1:单斜晶系 ,C2 /c空间群 ,a =2 2 2 43 ( 7)nm ,b =1 0 0 5 3 ( 3 )nm ,c =1 3 468( 4 )nm ,β =10 2 2 67( 5 )° ,V =2 942 8( 16)nm3 和Z =4.配合物 2 :三斜晶系 ,P1- 空间群 ,a =0 6949( 2 )nm ,b =1 0 183 ( 3 )nm ,c =1 0 989( 3 )nm ,α =76 0 69( 5 )° ,β =75 2 94( 5 )° ,γ =84 747( 5 )° ,V =0 72 95 ( 4 )nm3 和Z =2 .     

氨三乙酸桥连的3d-4f金属异核配合物:{[GdCu(NTA)(H_2O)_6Cl]ClO_4·H_2O}_n的合成和晶体结构

合成了金属异核配合物{[GdCu (NTA ) (H2 O ) 6 Cl]ClO4·H2 O}n,通过单晶衍射测定其结构。配合物的晶体属三斜晶系 ,空间群P 1 ,a =0 84 830 ( 1 0 )nm ,b =0 9642 ( 2 )nm ,c =1 2 838( 2 )nm ,α =1 1 1 1 70( 1 0 )° ,β =93 52 0 ( 1 0 )°,γ =1 0 0 890 ( 1 0 )°,V =0 9530 ( 3)nm3,Z =2 ,Dc=2 335g·cm- 3。配合物的晶体呈现锯齿状一维链状结构。铜离子是五配位 ,配位多面体是一个扭曲四棱锥。每个NTA通过其氮原子和 3个羧基的 3个氧原子与铜离子螯合 ,形成 3个五元环 ,氯离子也与铜离子配位。ClO- 4作为平衡离子位于链间。     

芳香碘基辅助的配位超分子自组装--锌(Ⅱ)、镉(Ⅱ)与7-碘-8-羟基喹啉-5-磺酸配合物的合成和结构

合成了锌(Ⅱ)、镉(Ⅱ)与7-碘-8羟基喹啉-5-磺酸(IHQS)的两种单晶配合物[Zn(IHQS)(H2O)3]2·4H2O(1)和[Cd-(IHQS)(H2O)2]n·2nH2O(2),用X射线衍射法确定了结构.结果表明,1和2均由一对对映体配合物构成1中两个[Zn-(IHQS)(H2O)3]对映体通过磺酸基-锌(Ⅱ)八面体轴向互补配位形成中心对称双分子聚合体,该聚合体通过分子间磺酸基氧-配位水氢键形成独特的二维层状结构;2的两个[Cd(IHQS)(H2O)2]对映体通过镉(Ⅱ)-磺酸基-镉(Ⅱ)双向互补配位形成一维直线型聚合配位结构.芳香碘基呈现新颖的碘-芳环氢和碘-磺酸基氧等弱相互作用模式,并对上述结构的支撑稳定发挥重要的结构辅助作用.本文展示了芳香碘基、磺酸基和喹啉环三种弱相互作用基团在配位超分子自组装中的形状、空间匹配和协同促进模式.结晶学参数配合物1单斜晶系,C2/c空间群,a=2.2243(7)nm,b=1.0053(3)nm,c=1.3468(4)nm,β=102.267(5)°,V=2.9428(16)nm3和Z=4.配合物2三斜晶系,P1空间群,a=0.6949(2)nm,b=1.0183(3)nm,c=1.0989(3)nm,α=76.069(5)°,β=75.294(5)°,γ=84.747(5)°,V=0.7295(4)nm3和Z=2.     

碳酸酐酶的化学模拟——含三(取代吡唑)硼氢根的金属配合物[η3-HB(3-Ar-5-Mepz)3]MX(M=Ni,Cu,Zn,Cd;Ar=2''''-thie,Ph;x=Cl,NO3)的合成和表征

合成了标题所示的一系列新的含三(取代吡唑)硼氢根的金属配合物,均通过元素分析、IR、1H NMR进行表征.配合物[η3-HB(3-(2'-thie)-5-Mepz)3]Zn(NO3)·1/2THF(2c)的晶体结构测定表明,硝酸根是以不对称双齿方式与Zn原子配位(Zn-O(2)键长为0.1966(4)nm,Zn-O(3)键长为0.2463(4)nm);而在镉的类似物{[η3-HB(3-Ph-5-Mepz)3]Cd(NO3)(THF)}(2e)中,NO-3则以双齿方式与Cd原子配位[Cd-O键长为0.2334(3)和0.2356(3)nm].NO-3随金属不同取不同方式配位的现象,为解释锌、镉碳酸酐酶的不同活性(与酶活性中心配位的HCO-3是NO-3的等电子体)提供了进一步的依据.配合物2c和2e均为三斜晶系,P-1空间群,Z=2.2c晶胞参数:a=1.16250(10),b=1.2422(2),c=1.32590(10)nm;α=71.410(10)°,β=73.090(10)°,γ=65.660(10)°;R=0.0755.2e品胞参数:a=1.13030(10),b=1.2099(2),c=1.2607(2)nm;α=102.050(10)°,β=91.780(10)°,γ=93.620(10)°;R=0.0302.     

锌二硫代氨基甲酸配合物的合成、晶体结构及其热稳定性研究

合成了3个二硫代氨基甲酸锌配合物[Zn_2(S_2CNBu_2~n)_4]，[Zn(S_2CNBy_2) _2](2)和[Zn(S_2CNBy_2)_2Py] (3) (Bu~n = 正丁基，By=苄基，Py=吡啶)。测定 了它们的晶体结构，红外光谱和热稳定性。1为单斜晶系，空间群C2/c，晶胞参数 a=2.3329(3)nm, b=1.7090(2)nm, c=1.6115(2)nm. α=90 °β=127.560(10) °, γ=90 °.2为正交晶系，空间群Pbcn，晶胞参数a=1.62193(11)nm, b=1.90010(12) nm, c=0.93795(6)nm. α=90 °,β=90 °,γ=90 °.3为三斜晶系，空间群P-1， 晶胞参数a=0.86418(6)nm, b=1.31156(9)nm, c=1.66238(11)nm. α=106.398(1) °,β=92.633(1) °,γ=107.461(1) °.1为二聚体，属典型的荒氨酸金属配合物 结构类型。2为一单核匹配位化合物，而在荒氨酸金属配合物中（除Ln,Ac系外）该 结构类型非常少见。2中引入吡啶环得到3，3为一五配位化合物，吡啶环的引入说 明2的中心离子处于配位不饱和状态，这与以往报道相吻合。1的热稳定性质研究发 现其在251 ℃有升华现象，可作为MOCVD的前驱物。     

一维配位聚合物2-巯基-5-甲基-1,3,4-噻重氮锌钴的合成、结构与性能

于中温混合溶剂热体系中合成出2种同构的一维配位聚合物[Zn(MMTT)2]n和[Co(MMTT)2]n(MMTT=2-巯基-5-甲基-1,3,4-噻重氮), 并进行了单晶结构解析、红外、热重、荧光及磁性等表征. 晶体同属单斜晶系, C2/c空间群. [Zn(MMTT)2]n的晶胞参数: a=1.40432(8) nm, b=1.13824(5) nm, c=0.72378(4) nm, β=101.425(3)°, V=1.13400(10) nm3; [Co(MMTT)2]n的晶胞参数: a=1.4001(9) nm, b=1.1142(9) nm, c=0.7403(3) nm, β=107.84(6)°, V=1.0994(12) nm3. 化合物中金属原子采取四面体构型, 与MMTT配体分子相互连接形成无限一维链; 链与链之间通过配体间弱的C-H···S 氢键连接而形成三维超分子网络结构.     

Pr(Ⅲ)和5-氨基间苯二甲酸的配位聚合物的水热合成和单晶结构研究

报道了单晶Pr(C8H5NO4) 1 5·H2 O的水热合成和晶体结构。中心离子Pr3 +处于 9配位的环境中。来源于配体的两个羧基螯合Pr3 +形成两个四元环。其它四个羧基通过桥键连接中心离子。晶体数据如下 :正交晶系 ,空间群Pbcn ,a =1 2 2 2 2 8( 7)nm ,b =0 80 2 95 ( 5 )nm ,c =2 5 61 1 1 ( 1 4)nm ,α =90°,β=90°,γ=90°。配体通过螯合和桥键金属离子在ac平面内构成地板形网格。羧基采用 η1,3 方式连接层平面 ,沿着b轴构成一维通道。与金属离子配位的水分子悬挂在隧道中     

金刚烷甲酸稀土(Nd(Ⅲ), La(Ⅲ))配合物[LnL3(HL)(H2O)]2·2EtOH·2H2O的合成和晶体结构

合成了金刚烷甲酸与稀土Nd(Ⅲ)和La(Ⅲ)离子配合物, 并测定了配合物的晶体结构. 配合物的组成为[LnL3(HL)(H2O)]2·2EtOH·2H2O (Ln=Nd (1), La (2), HL=金刚烷甲酸). 配合物晶体均属三斜晶系, 空间群为P1, 晶胞参数 配合物(1) a=1.0556(2) nm, b=1.4913(3) nm, c=1.4920(3) nm , α=106.26(3)°, β=93.51(3)°, γ= 97.23(3)°, V=2.2253(5) nm3, Dcal=1.409 g·cm-3, Z=1, F(000)=990, μ(Mo Kα)=1.225 mm-1, Mr=1888.54. 配合物(2) a=1.0453(2) nm, b=1.4971(3) nm, c=1.5052(3) nm, α=106.07(3)°, β=93.58(3)°, γ=97.56(3)°, V=2.2391(5) nm3, Dcal=1.397 g·cm-3, Z=1, F(000)=984, μ(Mo Kα)=1.015 mm-1, Mr=1877.88. 两个配合物属异质同晶, 呈双核结构, Ln(Ⅲ)为九配位, 形成畸变三帽三棱柱配位多面体.     

三核锌配位化合物Zn3(phen)2(2,4-DAA)6的水热合成、晶体结构、荧光和电化学性质

以2,4-二氯苯氧乙酸(2,4-DAA)和邻菲啰啉(Phen)为原料, 采用水热法合成了一个新的三核锌配合物Zn3(phen)2(2,4-DAA)6. 该配合物属三斜晶系, P1空间群, 晶胞参数a=1.1030(2) nm, b=1.2930(3) nm, c=1.5081(3) nm, α=100.436(3)°, β=110.227(3)°, γ=103.802(3)°, V=1.8760(7) nm3, Dc=1.661 g/cm3, Z=1, F(000)=944. 最终GooF=1.033 , 偏离因子R1=0.0326, wR2=0.0736. 在配合物分子中, 3个锌(Ⅱ)离子在同一直线上, 且以中间锌(Ⅱ)为对称中心, Zn1…Zn2的距离为0.3378 nm; 3个锌(Ⅱ) 离子存在两种配位方式: 其中对称的锌离子分别与3个2,4-二氯苯氧乙酸中的3个羧基氧原子及一个邻菲啰啉的2个N原子配位, 形成了五配位的变形四方锥结构, 而中间的锌离子与6个2,4-二氯苯氧乙酸中的6个羧基氧原子配位, 形成了六配位变形八面体结构. 研究了配合物的光谱和电化学性质.     

[Cu2(Gly-GlyO)2(4,4''''-bpy)(OH)2]·10H2O配合物的合成、晶体结构和分子结构研究

合成了以4,4'-bpy为中继基、Gly-GlyO为螯环的新型双核铜配合物.经X射线单晶结构分析确定该配位化合物晶体的化学式为[(H2NCH2CONHCH2COO)Cu(OH)(C10H8N2)Cu(OH)-(H2NCH2CONHCH2COO)]·10H2O.晶体属三斜晶系,Pl空间群,晶胞参数a=0.712 4(2)nm,b=1.140 5(10)nm,c=1.143 4(10)nm,α=67.55°,β=79.02°,γ=77.97°,V=0.834(3)nm3,Z=1.最终一致性因子R为0.072 7.     

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.     

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.     

Synthesis of N-substituted carbazolones from α-iodo enaminones via Pd(0)-catalyzed intramolecular coupling under microwave irradiation

A variety of N-aryl and N-alkyl carbazolones were conveniently achieved in good to high yields via Pd₂(dba)₃-mediated intramolecular coupling of N-substituted α-iodo enaminones under microwave irradiation. The Pd(0)-catalyzed cyclization was found to proceed favorably with the more electron-deficient phenyl ring during the reactions involving unsymmetrical N,N-diaryl α-iodo enaminones. This unique property enables the construction of carbazolone skeleton containing nitro substituted benzenoid ring.     

Synthesis of substituted 2,4,5,6-tetrahydrocyclopenta[c]pyrazoles and 2,4,5,6-tetrahydropyrrolo[3,4-c]pyrazoles by intramolecular nitrilimine cycloaddition

Both substituted 2,4,5,6-tetrahydrocyclopenta[c]pyrazoles and 2,4,5,6-tetrahydropyrrolo[3,4-c]pyrazoles have been synthesized by the 3+2 intramolecular dipolar cycloaddition of nitrilimines to alkynes. This cyclization has been extended to more versatile 3-bromo derivatives by the use of alkynylbromides as dipolarophiles.     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Catalyst free,visible-light promoted photoaddition reactions between C60 and N-trimethylsilylmethyl-substituted tertiary amines for synthesis of aminomethyl-1,2-dihydrofullerenes

An efficient and benign method for the preparation of aminomethyl-substituted fullerenes has been developed. The process, involving catalyst free, visible-light irradiation of 10% EtOH-toluene solutions containing fullerene C₆₀ and N-trimethylsilylmethyl-substituted amines by using a 20 W compact fluorescent lamp, leads to formation of aminomethyl-substituted fullerene adducts in a highly efficient manner. The photoaddition reaction takes place via a pathway initiated by visible light absorption by C₆₀, followed by SET from the amine to the triplet excited state of C₆₀. Ethanol-promoted desilylation of the resulting a minimum radical then generates the corresponding α-amino radical which couples with the C₆₀ radical anion to form the anion precursor of the fullerene adducts. The new approach using visible-light takes place under mild conditions and it does not require the use of photocatalysts. Thus, the method developed in this effort could broadens the range of functionalized fullerene derivatives that can be readily prepared.     

Highly efficient and stereoselective cycloaddition of nitrones to indolyl- and pyrrolylacrylates

The reactions of various nitrones with indolyl- and pyrrolylacrylates proceeds regioselectively with high diastereoselectivity in the case of aldonitrones, and represents an effective method for obtaining new indolyl- and pyrrolyl-substituted isoxazolidine carboxylates stabilized by weak (CH?O) and moderate (NH?N) strength intramolecular hydrogen bonding. The resulting cycloadducts exhibit promising in vitro anti-influenza activities.     

Transition metal-free direct amination of benzoxazoles using formamides as nitrogen sources

A transition metal-free method for the direct amination of benzoxazoles using formamides as nitrogen sources is reported, which was mediated by an inexpensive and environmentally friendly tetrabutylammonium iodide/tert-butyl hydroperoxide system and gave the 2-aminobenzoxazole derivatives with moderate to good yields.     

l-Proline-catalyzed five-component domino reaction leading to multifunctionalized 1,2,3,4-tetrahydropyridines

Multifunctionalized 1,2,3,4-tetrahydropyridines are concisely synthesized in good yields via l-proline-catalyzed or l-proline/FeCl₃-cocatalyzed one-pot multicomponent reactions (MCRs). The MCRs involve a domino hydroamination/prins reaction/Mannich-type reaction/intramolecular dehydration-cyclization process. The molecular structure of 5baa, one of multifunctionalized 1,2,3,4-tetrahydropyridines, was confirmed by single-crystal X-ray diffraction.