两个单核配合物晶态荧光材料的合成、晶体结构及性质

在水中采用蒸发溶剂的方法,合成了两个晶态单核配合物[Co(phen)3]·2H2SPA·0.5HSPA·10H2O(1)和[Ni(phen)2(H2O)2]·H2SPA·0.5HSPA·3H2O(2)(H2SPA'=间苯二甲酸-5-磺酸根阴离子,phen=1,10-邻菲罗啉).在配合物1中,中心离子与三个1,10-邻菲罗啉配位,形成[Co(phen)3]2+.未配位的水分子与阴离子H2SPA-和HSPA2-通过氢键相互连接形成三维的网状结构.在配合物2中,中心离子与两个1,10-邻菲罗啉分子和两个水分子配位,构成阳离子[Ni (phen)2(H2O)2]2+.阳离子[Ni (phen)2(H2O)2]2+与自由的阴离子H2SPA-、阴离子HSPA-和未配位的水分子通过氢键连接形成三维网状结构.室温下两个配合物均具有荧光发射峰,其发射峰分别在460 nm和439 nm.与配体相比,均发生明显的红移.荧光寿命分别为1.1244 ns和1.4882 ns.     

两个含氮配体配合物固体荧光材料的合成、晶体结构及性质

采用缓慢蒸发溶剂法在水中合成了两个含氮配体配合物[Co(phen)3] ·3,5-(SO3)2H2Cat·6H2O(1)和[M(py)3(H2O)3]·(1,5-nds) (2)(H2Cat=1,2-二羟基苯阴离子,M=Co0.88Cuo.12,1,5-nds=1,5-萘二磺酸根离子,phen=1,10-邻菲罗啉,py=吡啶).配合物1中,钴离子与三个1,10-邻菲罗啉配位形成[Co(phen)3]2+.六个自由的水分子与3,5-(SO3)2H2Cat阴离子通过氢键相互连接形成二维的层状结构.配合物2中,中心离子是由钴离子和铜离子构成,其与三个吡啶和三个水分子配位,构成[M(py)3(H2O)3]2+.自由的1,5-nds阴离子通过氢键连接[M(py)3(H2O)3]2+,形成三维网状结构.室温下两个配合物均具有荧光发射蜂,其最大发射峰分别在551 nm和340 nm.它们的荧光发射的主要原因分别是配体间电荷转移和配体-金属间电荷转移.     

链状钴配合物的水热合成、晶体结构及荧光性质

采用水热法合成得到了链状钴配合物[Co(4,4'-bipy)(H2O)4]n· 2nH2L· 4nH2O(H2L-＝2,5-二羟基苯磺酸离子,4,4'-bipy＝4,4'-联吡啶).采用X射线单晶衍射、元素分析、红外光谱、热重分析等对配合物进行了组成和结构表征.单晶衍射研究表明,配合物中钴离子与4,4'-bipy的氮原子配位和水分子的氧原子配位,形成扭曲的八面体配位构型. H2L-配体没有配位,只是平衡结构中的电荷.在结构单元中,[Co(4,4'-bipy)(H2O)4] +,H2L-和H2 O之间通过氢键相连.配合物的荧光发射峰与配体相比发生了红移,最大发射峰在411 nm.     

一例吡嗪羧酸镉配合物的合成、结构及荧光性质研究

吡嗪化合物因其独特的结构及活性被广泛应用于制药、医学、化学等领域。水热法以水作为溶剂,具有绿色无污染、简单易操作等特点,是合成配合物的首选方法。本文以2,6-双(2-吡嗪基)吡啶-4-对苯甲酸(Hbppc)和CdCl₂·2.5H₂O为原料,用水热合成法合成了一例新型的配位化合物[Cd(bppc)(H₂O)Cl]_n,并运用单晶X射线衍射、红外光谱和拉曼光谱分析等手段对配合物的结构进行了表征,结果表明此配合物为一维链状结构。对自由配体2,6-双(2-吡嗪基)吡啶-4-对苯甲酸及配合物[Cd(bppc)(H₂O)Cl]_n进行荧光分析,结果表明所得配合物具有较好的荧光性质。     

双配体锌配合物的合成、结构及其荧光与化感调控性能研究

以对氨基苯甲酸、邻菲罗啉和与Zn(Ⅱ)通过溶剂扩散法得到配合物[Zn(C7H6O2N)(C12H8N2)Cl]浅黄色颗粒状晶体,通过元素分析、红外光谱、TG分析等方法对其进行了表征,并对目标配合物的荧光性质进行了探讨.X-射线单晶衍射分析表明,该配合物晶体属于单斜晶系,空间群为C2/c,晶体结构中丰富的氢键将分子连接成三维无限网络结构.生长调节实验表明:该配合物对水稻种子的萌发生长具有明显的调控作用,表现出低浓度下促进高浓度抑制的整体态势.     

一种新型双核Zn(Ⅱ)配合物的合成、表征及性质研究

选用溶剂热法,以邻羟基苯甲醛缩4-氨基安替比林和Zn(NO3)2·6H2O为原料,成功合成出了一种新型双核Zn(Ⅱ)配合物[Zn2(L-)2(NO3)2](HL为邻羟基苯甲醛缩4-氨基安替比林),并采用单晶X射线衍射、红外光谱、X-粉末衍射、元素分析、热重分析等对该配合物单晶结构进行表征.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=0.80724(11)nm,b=0.94547(13) nm,c=1.28831(18) nm,α =99.281 (2)°,β=103.814(2)°,y=107.373 (2)°,V=0.8821 (2) nm3,Z =2,Dc=1.633 Mg/m3,F(000) =444,μ=1.432 mm-1,R1=0.0449,wR2=0.1083[I＞2σ-(I)].室温下固态荧光测试显示,配合物具有强的荧光吸收在490 nm(λmax).     

基于1,2,4-三唑与水桥联的双核镉配合物的合成、晶体结构及荧光性质

利用缓慢蒸发溶剂法合成了双核镉配合物[Cd2(dpatrz)2Br4(H2O)](dpatrz=3,5-丙基-4-氨基-1,2,4-三唑).通过元素分析、红外光谱和粉末衍射进行了常规表征,同步辐射光源衍射结构分析给出该配合物结晶于四方晶系空间群P42/n.Cdl中心为五配位[CdN2OBr,],呈扭曲的三角双锥几何构型,中心对称的两个Cd原子通过两个μ1.2-dpatrz和一个H2O分子桥连形成双核结构,氢键作用加强了空间结构的稳定性并形成一维链结构.对配合物的热重分析与室温下固体荧光也分别进行了研究.     

乙酸根桥联双核锌配合物的合成、表征及晶体结构

首次以乙酸锌、三(2-氨基乙基)胺及四氟硼酸钠为原料在甲醇介质中反应,合成得到了新颖桥联配合物{[( tren)Zn(CH3COO)Zn(tren)](BF4)3},用元素分析、红外光谱、核磁共振氢谱和热重分析对其进行了表征,用X-射线单晶衍射仪测定了其晶体结构,其晶体属于四方晶系,空间群为P-42(1)m,晶体参数分别为a=1.16106(19) nm,b=1.16106(19) nm,c=1.0851(3) nm,α=β=γ=90 °,V= 1.4627(6) nm3 ;Dc=1.686 g/cm3;Z = 3;F(000)=756;μ=1.745 mm-1.     

异构体复晶-席夫碱锌配合物的合成、晶体结构及表征

以2-乙酰吡啶、高氯酸锌和2-氨基乙基-二(3-氨基丙基)胺为原料在甲醇介质中反应制备全氮配位的异构体复晶-席夫碱锌配合物,用元素分析、红外光谱、核磁共振氢谱和热重分析对其进行了表征,用X射线单晶衍射仪测定其晶体结构,结果表明该异构体复晶-席夫碱锌配合物属于单斜晶系,P2(1)/c空间群.晶胞参数分别为a=1.8517(6) nm,b=1.5341(5) nm,c= 1.6061(5) nm,α=γ=90 °,β=90.743(6) °,V=4.562(2) nm3 ;Dc=1.577 g/cm3;Z= 4, F(000)=2240; μ=1.361 mm-1.     

三元稀土配合物Ln(5-Cl-SA)3(Phen)2的合成、晶体结构和荧光性质

以才/乙醇/乙腈为溶剂,采用溶剂热法,合成了两个结构新颖的异质同晶稀土配合物Ln (5-Cl-SA)3(Phen)2(Ln=Nd(1)、Ho(2),5-Cl-SA=5-氯水杨酸,Phen=邻菲罗啉).利用X-射线单晶衍射(SCXRD)、元素分析(EA)、红外光谱(FTIR)、热重分析(TG)、荧光分光光度法(FS)等对其结构和光学性质进行了分析与表征.结果表明,两种稀土配合物均为单斜晶系、P21/c空间群,其中钕配合物(1)为十配位的双帽四方反棱柱构型,由于镧系收缩效应的影响,钬配合物(2)为九配位的三帽三棱柱构型,且两种配合物均具有良好的荧光性质.     

Synthesis, Crystal Structures, Thermal and Luminescent Properties of Rare Earth Metal Complexes with 1,2,4,5-Benzenetetracarboxylic Acid

Abstract  

[Pr(Hbtca)(H₂O)] (1), [Eu(Hbtca)(H₂O)] (2), [Gd(Hbtca)(H₂O)] (3) (H₄btca: 1, 2, 4, 5-benzenetetracarboxlyic acid) have been synthesized and characterized by single crystal X-ray diffraction studies, elemental analysis and FT-IR. Structural determination reveals that these three complexes are isostructural. In compounds, center atoms coordinate to one ligand (Hbtca)³⁻ and one water molecule with nine-coordinated distorted monocapped anti-square prism geometry. Four carboxyl groups of (Hbtca)³⁻ adopt μ ₂–η ¹:η ² and μ ₁–η ¹:η ¹ two different coordination modes. The whole ligand (Hbtca)³⁻ acts as a μ ₆-bridge to connect six different rare earth M(III) ions to generate a 3D network. Thermal stability of three complexes and luminescent property of 2 are investigated.     

Synthesis and Properties of New Liquid Crystalline Materials

In the last years several reviews on liquid crystalline substances were published. These reviews concern different topics, however, mainly aspects of practical use of liquid crystals. Now we try to give a survey on the activities of the Halle Liquid Crystal Group in the last years with respect to synthesis and physicochemical investigation of new materials for liquid crystal displays.     

Synthesis, Crystal Structures and Properties of Two Copper (II) Complexes with Pyridazine Derivative Ligand

Abstract  Two new complexes, [Cu(L)₂(CH₃OH)] · (ClO₄)₂ (1) and [Cu(L)₂(H₂O)] · (NO₃)₂ (2), have been synthesized and their crystal structures have been determined by X-ray analysis, where L = 3-(3,5-bimethylpyrazole-yl)-6-chloro-pyridazine]. The complex 1 crystallizes in the monoclinic, space group C2/c, and the coordination configuration of copper (II) is better described as trigonal pyramidal geometry with four N atoms from L and one O_methanol^. The coordination configuration of 2 is quite similar to that of 1 except O_water instead of O_methanol^. The intermolecular hydrogen bonds link the repeat units and extend the molecules to multinuclear structures in both compounds. The spectral properties of the title compounds have been studied and discussed. Furthermore, the antibacterial activities of the title compounds have been detected, the results indicate that the ligands and two copper(II) complexes exhibit certain fungicidal activities again several bacteria. Index Abstract  Two new complexes, [Cu(L)2(CH3OH)]·(ClO4)2 (1) and [Cu(L)2(H2O)]·(NO3)2 (2), have been synthesized and their crystal structures have been determined by X-ray analysis, where L= 3-(3,5-bimethylpyrazole-yl)-6-chloro-pyridazine. The intermolecular hydrogen bonds extend the molecules to multinuclear structures in both compounds.      

Two New 2-Benzoylbenzoate Metal Complexes with Bapen: Synthesis,Spectroscopic and Crystal Structures

Abstract  

Coordination compounds of compositions [Ni(bba)₂(bapen)] (1) and [Cu(bba)₂(bapen)]0.5H₂O (2), where bba = 2-benzoylbenzoate, bapen = N,N′-bis(3-aminopropyl)ethylenediamine, have been prepared. The crystal and molecular structure of (1) and (2) were determined by X-ray analysis. Nickel and copper atoms are six-coordinated by four N atoms of amine and O donor atoms of 2-benzoylbenzoate anions, whereas 0.5 water molecule is situated outside the coordination sphere in (2). The calculated ∆(OCO) values are consistent with presence of monodentate carboxylate. Thermal analysis show that the mass losses of 1 in the temperature ranges 240–343 °C correspond to the decomposition of bba ligands, while the mass losses of 2 in the temperature ranges 105–125 °C correspond to the decomposition of crystal lattice water molecule.     

Synthesis and Crystal Structures of Two Complexes with Carboxylic Derivatives of Nitrogen-containing Heterocycle Ligands

Abstract  

Two new complexes [Zn(pcn)₂(H₂O)₂] (1) and [Cd(inic)₂(H₂O)₄] (2) (pcn = 2-pyrazinecarboxylate, inic = isonicotinic acid) were synthesized by the hydrothermal reaction and characterized by single crystal X-ray diffraction, elemental analysis, IR spectrum and UV spectrum. In complex 1, the Zn(II) central ion is six-coordinated by two oxygen atoms and two nitrogen atoms from pcn ligands and two oxygen atoms from two coordinated water molecules. In complex 2, the Cd(II) central ion is six-coordinated by two nitrogen atoms from isonicotinate ligands and four oxygen atoms from the coordinated water molecules. Both complexes are mononuclear but hydrogen bonds enrich the structural construction. The visible spectra of the complexes between 200 and 300 nm are assigned to intraligand (IL) π–π* transitions of the pyridyl or pyrazine ligands.     

MgMoO4∶Tb3+发光材料的制备及发光性能研究

利用燃烧法于900℃制备了一种新型的MgMoO4∶Tb3绿色荧光粉.利用红外光谱(IR)、X射线衍射(XRD)研究了样品的物相和结构,利用漫反射光谱(DRS)、激发(PLE)和发射光谱(PL)研究了样品的发光性能.结果表明:所制备荧光粉为纯相MgMoO4;这种荧光粉可以被355 nm的紫外光有效激发并在545 nm处具有最强发射峰.同时研究了荧光粉的优化工艺条件,即Tb3+的掺杂浓度为0.20,合成温度为900℃,保温时间为5 min,n(CA)∶n(Mg+ Mo)为0.8∶1.CIE色度图分析表明,这种荧光粉的发光位于绿光区域,是一种适用于白光LED的潜在的绿色荧光粉.