系列三联吡啶衍生物的合成及在催化氧化中的应用

采用一步法合成了5种三联吡啶的衍生物:4′-(吡啶-4-基)-2,2′∶6′,2″-三联吡啶(L1)、4′-苯基-2,2′∶6′,2″-三联吡啶(L2)、4′-(3,5-二氯吡啶-4-基)-2,2′∶6′,2″-三联吡啶(L3)、4′-(3,5-二溴吡啶-4-基)-2,2′∶6′,2″-三联吡啶(L4)、4′-(4-(吡啶-4-基)苯基)-2,2′∶6′,2″-三联吡啶(L5),其中L3和L4为尚未见报道的新颖化合物。以制备的多吡啶化合物为配体,和MnCl₂·4H₂O共同催化苄基醇的氧化反应,研究发现5种多吡啶配体均具备良好的性能,配体分子结构中的4′-吡啶取代基对提高催化活性有重要作用。最后选用性能最优的4′-(4-(吡啶-4-基)苯基)-2,2′∶6′,2″-三联吡啶为配体,与MnCl₂·4H₂O共同催化叔丁基过氧化氢氧化苄基醇和苄基烷烃,5种典型底物的转化率均在95%以上,产率在90%以上。该催化氧化方法有望应用于芳香酮类化合物及相关药物中间体的绿色、高效合成。     

超分子化合物[Co(HL)(2,2'-bipy)2]·9.5H2O的合成、晶体结构和热性质

合成了超分子化合物[Co(HL)(2,2'-bipy)2]·9.5H2O(H3L=对羧基苯磺酰甘氨酸,2,2'-bipy=2,2'-联吡啶),并通过单晶X射线衍射确定了晶体结构,晶体结构分析表明化合物C29H42CoN5O15.5S属单斜品系,C2/c空间群.Co(Ⅱ)离子为6配位的八面体结构,对羧基苯磺酰甘氨酸作为双齿配体与Co(Ⅱ)离子配位,2,2'-联吡啶和co(Ⅱ)离子双齿螯合配位.配合物通过氧键和π-π堆积作用形成三维结构,配合物中含有一个由18个水分子组成的独立水簇.在氮气气氛中对该化合物进行了热重分析,结果表明:该化合物在30.1℃时开始失重,440℃时分解完全.     

新型多吡啶铂（Ⅱ）炔基络合物的光物理性能及在超分子化学中的应用

d8 族多吡啶Pt(Ⅱ )络合物具有平面构型的不饱和络合物 ,其特殊的分子构型及电子排布 ,能够产生许多特殊的、具有潜在应用价值的激发态性质 .本论文设计、合成了一系列炔基为辅助配体的多吡啶Pt(Ⅱ )络合物 ,系统地研究了它们的光物理性质 ,探讨了其在超分子化学中的应用 ,取得了一系列有意义的研究结果 .1　三联吡啶Pt(Ⅱ )炔基络合物光物理性质1 .1　设计、合成了一系列炔基为辅助配体的三联吡啶Pt(Ⅱ )络合物 ,获得了在室温溶液中长寿命、高量子产率的3MLCT态发光 .其中以脂肪炔为辅助配体的三联吡啶络合物发光量子产率高达 0 .30以…     

橙红色磷光铱(Ⅲ)配合物的合成及表征

以二苯基吡啶(ppy)和2,2'-联吡啶-4,4'-二羧酸(H2dcppy)为配体,与水合三氯化铱(IrCl3·3H2O)配位,我们合成了一种结构新颖的具有橙红色磷光发射的金属铱配合物Ir(PPY)2(H2dcppy)PF6,其结构通过FT-IR光谱和核磁共振氢谱得到了确认.紫外吸收光谱和荧光光谱表明,该配合物具有明显...     

一种含末端双炔芴类化合物的合成

以2,7-二溴芴为原料,通过烷基化反应和钯催化下的Sonogashira偶联反应,以较高产率合成出了一种末端含有双炔的芴类化合物,这种末端双炔化合物可以作为进行＂点击化学＂反应的单体原料。     

轴手性2,2'-联吡啶衍生物的合成、表征与催化性质研究

轴手性2, 2'-联吡啶衍生物具有性质稳定、反应条件温和、易于制备等优点,因此被广泛应用于复杂分子的合成及不对称催化等领域。本文设计合成了一系列轴手性2, 2'-联吡啶衍生物L1-L4,通过~1H NMR、~(13)C NMR、X-射线单晶衍射对其组成和结构进行了表征。该类轴手性2,2'-联吡啶衍生物与Pd(II)形成的配合物,能有效催化2-环己烯-1-酮与芳基硼酸的不对称1, 4-加成反应,目标产物具有较好的对映选择性和高达94%的产率。     

配位聚合物[Cu(OPT)_2]_n的合成及表征

利用水热法,以3-(3-羟基)-5-(吡啶-2-基)-1,2,4-三唑和硝酸铜为原料,合成一个结构新颖的3D超分子配位聚合物[Cu(OPT)2]n(1)。并对其进行了X-射线单晶衍射、元素分析、红外检测及热稳定性分析等结构测定和表征。结果表明,该配位聚合物属于单斜晶系,P21/n空间群,中心Cu(Ⅱ)离子与四个氮原子配位,形成四配位的平面正方形结构,其中两个氮原子来自两个配体的三唑环,另两个氮原子来自两个配体的吡啶环。配合物中存在分子内三中心氢键,并通过分子间氢键作用形成3D超分子结构。     

米力农锌配合物的合成、拓扑结构及性质表征

本研究利用含氰基的米力农作为配体与叠氮化钠及氯化锌在水热条件下合成得到了一个新颖结构的米力农四唑配合物[Zn(Mitz)_2(H_2O)]_n(1)(Mitz=米力农四唑=2-甲基-6-氧-1,6-二氢-(3,4’-双吡啶)-5-四唑),中心金属离子ZnⅡ与来自一个配体吡啶环上的氮原子和另外两个不同配体四唑环上的1,4位氮原子及一个水分子配位形成了一个形成一个轻微扭曲的的四面体结构,四个配体分别通过吡啶环和四唑环上的氮以金属锌为节点首尾相连,再加上另一个配体上四唑环上的1和4位上的氮在金属间桥联,形成了一个四十四元大环。每个配体分别通过四唑上的1和4位的氮原子及吡啶环上的氮原子形成一个三齿配体与三个Zn配位,三个配位原子方向各异,由此使得整个结构沿着空间各个方向延伸,形成了一个新颖的拓扑结构。通过热重分析还发现配合物1在450℃后才开始逐渐解体,这说明它是一个较为稳定的化合物。     

3'-脱氧-3'-18F-氟代胸腺嘧啶核苷的合成研究

采用TRACERlab FXF-N自动化合成装置制备了肿瘤显像剂3'-脱氧-3'-18F-氟代胸腺嘧啶核苷(18F-FLT).以3-N-t-叔丁氧羰基-1-[5'-O-(4,4'-二甲氧基三苯甲基)-2'-脱氧-3'-O-(4-硝基苯磺酰基)-β-D-苏型-呋喃戊糖基]胸苷为前体,经过亲核氟化、盐酸水解两步反应及HPLC分离纯化制备18F-FLT,研究了不同因素对合成效率的影响.结果表明,总合成时间约55 min,未校正18F衰变情况下,放射化学产率约25%,放化纯度大于95%.     

双(咪唑啉-2-亚胺)吡啶钯配合物的合成及其配位结构的研究

合成了一种未见报道的新型双(咪唑啉-2-亚胺)钯配合物,在合成过程中优化了传统的原料合成路线,得到的配体通过1H NMR进行了表征,配体结构中含有两个具有强推电子效应的氮杂环卡宾,钯配合物的空间配位结构通过X-Ray单晶衍射分析确定。单晶分析结果显示,该配合物的金属中心与三个氮原子配位,原本与金属原子相连的氯原子从金属中心脱落,以配位的形式存在于配合物晶体的晶胞结构中,咪唑啉环所在平面与吡啶环平面呈接近九十度的夹角,使得咪唑啉环很好的包围了金属中心。     

Guanine and plasmid DNA binding of mono- and trinuclear fac-[Re(CO)3]+ complexes with amino acid ligands

We have synthesized and fully characterized four new complexes comprising the fac-[Re(CO)3]+ moiety and the ligands NH3, L-proline (Pro), or N,N-dimethylglycine (dmGly). The reaction of [Re(H2O)3(CO)3]+ with the two amino acids gives trinuclear complexes of general formula [Re(L)(CO)3]3 (where L = amino acid). We have studied the in vitro behavior of these compounds with guanine and DNA in order to understand whether the cytotoxicity exhibited by certain rhenium complexes based on the fac-[Re(CO)3]+ core is due to the formation of nucleobase complexes and inter- or intrastrand links between DNA bases. We have performed model studies with guanine and studied the structural effects induced by different rhenium(I) tricarbonyl complexes on PhiX174 plasmid DNA by electrophoretic methods. Our results show that rhenium complexes with two available coordination sites interact with plasmid DNA to form a stable adduct that is likely to involve two bases.     

Click Chemistry合成1,2,3-三唑氨基酸衍生物

通过W ong叠氮转化和亲核取代反应,分别合成了叠氮苯丙氨酸、叠氮丙氨酸、苄基叠氮,采用上述叠氮化物与L-炔丙基甘氨酸进行C lick反应,合成了3个1,4-取代1,2,3-三唑氨基酸衍生物:2-氨基-3-[1-(1-羧基-2-苯乙基)-1H-1,2,3-三唑-4-基]丙酸、3,3-′(1H-1,2,3-三唑-1,4-基)双(2-氨基丙酸)和2-氨基-3-(1H-1,2,3-三唑-1-苄基-4-基)丙酸,收率分别是76%、62%和68%,产物结构经核磁共振波谱、质谱、红外光谱进行了表征。1,2,3-三唑氨基酸衍生物含双功能螯合基团,是很有潜力的fac-[188Re(CO)3(H2O)3]+放射性标记配体。     

Pyrazolyl-diamine ligands that bear anthracenyl moieties and their rhenium(I) tricarbonyl complexes: synthesis, characterisation and DNA-binding properties

Two novel families of pyrazolyl-diamine ligands that bear an anthracen-9-yl group as a DNA-binding fragment, pz*(CH2)2NH(CH2)2NHCH2-9-anthryl (pz*=pz (L(1)), 3,5-Me2pz (L2)) and pz*(CH2)2NH(CH2)2NH(2 (pz*=4-(9-anthrylmethyl)pz (L3), 3,5-Me2-4-(9-anthrylmethyl)pz (L4)), have been prepared and fully characterised. In the case of L2-L4, the evaluation of their coordination capability towards the fac-[Re(CO)3]+ core led to the synthesis of the organometallic complexes fac-[Re(CO)(3){3,5-Me(2)pz(CH2)2NH(CH2)2NHCH2-9-anthryl}]Br (7) and fac-[Re(CO)3{4-(9-anthrylmethyl)pz*(CH2)2NH(CH2)2NH2}]Br (pz*=pz (8), 3,5-Me2pz 9). The interaction of the novel pyrazole-diamine ligands and the rhenium(I) complexes with calf thymus (CT) DNA has been investigated with a variety of spectroscopic techniques (UV-visible, fluorescence, circular dichroism (CD) and linear dichroism (LD)). All of the evaluated compounds have a moderate affinity to CT DNA (3.46x10(3)相似文献   

Structural characterization of the rhenium(v) oxo complex of mercaptoacetyltriglyclne in its dianionic form

Dianionic [MO(MAG(3))](2-)(MAG(3) = penta-anionic form of mercaptoacetyltriglycine, M = (186)Re, (99m)Tc) complexes have important applications in nuclear medicine. In vivo the complexes have a deprotonated carboxyl group that is important to their biodistribution. The solid-state structures of (99)Tc and Re complexes with mercaptoacetyltriglycine reported previously are monoanions with protonated carboxyl groups. In the present work, we report the preparation and X-ray crystal structure of Na(2)[ReO(MAG(3))].5H(2)O (1), which contains the physiologically relevant dianion. The dianion is a distorted square pyramid with the nitrogen and sulphur donor atoms forming the base and the oxo ligand at the apex. The terminal carboxyl group is deprotonated, uncoordinated and has a syn orientation with respect to the oxo ligand. The syn conformation of the dianion in 1 differs in conformation from the anti-monoanion in [Bu(4)N][ReO(MAG(3)H)] but is similar to the syn-monoanion in [Ph(4)P][(99)TcO(MAG(3) H)].     

Isomer dependent assembly of lead(II) compounds derived from 5-(n-pyridyl)tetrazole-2-isopropionic acid (n = 2,3)

Isomer plays a significant role in the formation of coordination compounds. Reactions of isomeric 5-(n-pyridyl)tetrazole-2-isopropionic acid (denoted as Hn-pytzipa, n = 2, 3) with Pb(NO₃)₂ under solvothermal conditions afforded two compounds with the same formula [Pb(2-pytzipa)₂]_n (1) and [Pb(3-pytzipa)₂]_n (2), respectively. In compound 1, 2-pytzipa acts as a tetradentate ligand via the pyridine-N and the tetrazole-N in a chelating mode and the carboxylate group in a μ_1,3-COO chelating mode. In contrast, 3-pytzipa in compound 2 acts as a tridentate ligand by only the pyridine-N and the carboxylate group in a μ_1,3-COO chelating mode, whereas all the nitrogen atoms of the tetrazole ring are uncoordinated. Compound 1 shows a ladder-like chain while compound 2 displays a wave like chain. In addition, the photoluminescence properties of these ligands and compounds 1 and 2 in the solid state were investigated at room temperature. The thermal behavior of such compounds were also discussed.     

Antibacterial Co(II) and Ni(II) Complexes of N-(2-Furanylmethylene)-2-Aminothiadiazole and Role of SO(4), NO(3), C(2)O(4) and CH(3)CO(2) anions on Biological Properties

Co(II) and Ni(II) complexes with a Schiff base, N-(2-furanylmethylene)-2-aminothiadiazole have been prepared and characterized by their physical, spectral and analytical data. The synthesized Schiff-bases act as tridentate ligands during the complexation reaction with Co(II) and Ni(II. metal ions. They possess the composition [M(L)(2)]X(n) (where M=Co(II) or Ni(II), L=, X=NO(3) (-), SO(4) (2-), C(2)O(4) (2-) or CH(3)CO(2) (-) and n=1 or 2) and show an octahedral geometry. In order to evaluate the effect of anions upon chelation, the Schiff-base and its complexes have been screened for antibacterial activity against bacterial strains e.g., Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa.     

One-step orthogonal-bonding approach to the self-assembly of neutral rhenium-based metallacycles: synthesis, structures, photophysics, and sensing applications

Self-assembled metallacycles offer structural diversity and interesting properties based on their unique frameworks and host-guest chemistry. As a result, the design and synthesis of these materials has attracted significant research interest. This Account describes our comprehensive investigations of an effective orthogonal-bonding approach for the self-assembly of neutral Re-based metallacycles. We discuss the various types of assemblies that can be created based on the nuclearity of the luminophore, including bimetallic materials, rectangles, cages, and calixarenes. This approach permits the preparation of a rectangular molecule, rather than two molecular squares, in excellent yields. We extended this strategy to the high yield synthesis of a series of Re-based metallacycles with different shapes. With the rich spectroscopic and luminescence properties, Re(I) metallacycles provide an excellent platform for studies of host-guest interactions. When possible, we also present potential applications of the luminescent Re-based metallosupramolecular assemblies. The orthogonal-bonding approach involves the simultaneous introduction of two ligands: a bis-chelating ligand to coordinate to two equatorial sites of two fac-(CO)(3)Re cores and a monotopic or ditopic nitrogen-donor ligand to the remaining orthogonal axial site. Furthermore, by the appropriate choice of the predesigned organic ligands with various backbones and connectivity information and fac-Re(CO)(3) metal centers, we could also design other novel functional metallacycles including rotors, gondolas, cages, triangles, and metallacalixarenes in high yields. The incorporation of flexible ligands into the Re(I) metallacycles allows us to introduce various conformation states and novel structures. As a result, these structures acquire new functions, such as adaptive recognition properties. For example, we assembled Re(I)-based metallacyclic rotors via a one-step process. These rotors, which contain a para-phenylene unit that rapidly rotates within the metallacycles, are prototypes of a neutral altitudinal rotor. Most of the metallacycles are luminescent. The ability to chemically modify the organic ligands offers opportunities to create structural diversity and to tune the photophysical properties of these Re(I) metallacycles efficiently. Several strategies for increasing emission quantum yields and excited-state lifetimes and tuning the colors in Re(I) metallacycles are available. The cyclometalated ligands in Re(I) metallacycles improve excited state lifetimes and quantum yields, and these C-H bond-activated metallacycles are considerably more emissive than their non-C-H bond-activated analogues. The introduction of crown-ether-like recognition sites into neutral gondola-shaped metallacycles that selectively recognize metal ions also enhanced emission. Rhenium-based rectangular boxes, synthesized via a simple one-step route, contain a large and tunable hydrophobic inner cavity, which selectively recognizes benzene molecules. Such structures were the best host for benzene reported to date. In addition, we designed and synthesized novel neutral metallacalixarenes with tunable size, cavity, color, and functionality. These structures are efficient hosts for the recognition of planar aromatic guests.     

Antibacterial Role of SO(4), NO(3), C(2)O(4) and CH(3)CO(2) Anions on Cu(II) and Zn(II) Complexes of a Thiadiazole-derived Pyrrolyl Schiff Base

A condensation reaction of 2-amino-1,3,4-thiadiazole with 2-pyrrolecarboxaldehyde to form tridentate NNN donor Schiff base has been performed. The prepared Schiff base was further used for the formation of metal complexes having stoichiometry [M(L)(2)]X(n), where M=Cu(II) or Zn(II), L=N-(2-pyrrolylmethylene)-2-amino-1,3,4-thiadiazole, X=SO(4) (2-), NO(3) (-), C(2)O(4) (2-) or CH(3)CO(2-) and n=1 or 2. The new compounds described here have been characterized by their physical, spectral and analytical data, and have been screened against several bacterial strains such as Escherichia coli, Staphylococcus aureus, and Pseudomonas aeruginosa. The antibacterial potency of the Schiff base increased upon chelation/complexation, having the same metal ion (cation) but different anions opening up a novel approach in finding new ways to fight against antibiotic resistant strains.     

Synthesis and characterization of some metal carbonyls with 2-hydroxyacetophenone ethanesulfonylhydrazone

Five new complexes, [M(CO)₅(apesh)] [M=Cr; (1), Mo; (2), W; (3)], [Re(CO)₄ Br(apesh)] (4) and [Mn(CO)₃(apesh) ] (5) have been synthesized by the photochemical reaction of metal carbonyls [M(CO)₆] (M=Cr, Mo, W), [Re(CO)₅ Br], and [Mn(CO)₃ Cp] with 2-hydroxyacetophenone ethanesulfonylhydrazone (apesh). The complexes have been characterized by elemental analysis, mass spectrometry, FT-IR, ¹H NMR spectroscopy. The spectroscopic studies show that apesh behaves as a monodentate ligand coordinating via imine N donor atom in (1)–(4) and as tridentate ligand in (5).     

Monomeric complexes of Re(CO)3+ ion with tridentate N∩N∩O−ligands — Schiff base derivatives of salicylic aldehyde

Simple synthetic procedures, reactions of Re(CO)₅Cl with potentially tridentate N∩N∩OH ligands (Schiff bases prepared from aliphatic or aromatic amines and salicylic aldehyde) lead to formation of monomeric complexes of fac-Re(CO)₃⁺ ion. Three obtained complexes have been characterized by means of elemental analyses and IR, UV–vis, and EI-MS techniques. Molecular structures of the synthesized species were investigated using X-ray diffraction measurements. Depending on the nature of N∩N∩OH ligand the investigated Schiff bases form with fac-Re(CO)₃⁺ ion bidentate or tridentate chelates with N∩N, N∩O⁻ or N∩N∩O⁻ coordination types.