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.     

两个晶态异质同构配合物荧光材料的合成、结构及性质

在水中采用蒸发溶剂的方法,合成了两个异质同构的单核配合物[M(phen)2(H2O)2]·2SIPH2·2H2O (M=Zn,Co),SIPH2=间苯二甲酸-5-磺酸根阴离子,phen=1,10-邻菲罗啉).在两个配合物结构单元中,中心离子与两个1,10-邻菲罗啉和两个水分子配位,形成[M(phen)2(H2O)2]2+阳离子.两个未配位的水分子与[M(phen)2(H2O)2]2+阳离子,SIPH2-阴离子通过氢键相互连接形成三维的网状结构.SIPH2-阴离子起到平衡电荷的作用.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1.7638 ms和1.6356 ms.     

一例镍(Ⅱ)配合物的合成、晶体结构及性质研究

以2,6-双(2-吡嗪基)-4,4′联吡啶(dpyb)和NiCl2为原料,在水热条件下合成了镍(Ⅱ)配合物Ni(dpyb)2,用X射线单晶衍射、元素分析、红外光谱、紫外光谱、对其进行了表征,研究结果表明,该配合物为单斜晶系Cc空间群,其晶胞参数为:a=1.3006(3)nm,b=1.1667(3)nm,c=2.5019(7)nm,α=90°,β=104.998(4)°,γ=90°.配物中,Ni2+与两个dpyb配体中六个氮配位形成单核结构,单核单元再通过分子间弱的作用力连接为三维超分子结构.     

三维超分子单核铅配合物[Pb(m-abc)2(phen)]的合成,晶体结构和性质研究

水热条件下,合成了具有三维超分子结构的单核Pb(II)的含混合配体化合物[Pb(m-abc)2(phen)](m-abc=间氨基苯甲酸,phen=1,10-邻菲啰啉),并通过多种手段如X-射线单晶衍射、室温固体红外、元素分析和热重等对其进行了表征.X-射线单晶衍射的分析结果表明,化合物结晶于单斜晶系P21/c空间群,晶胞参数:a=0.80415 (10)nm,b=1.52987(19)nm,c=1.8330(2)nm,β=98.251(2)°,V=2.2317(5)nm3,Z=4.化合物中的Pb离子采用五配位模式PbO3N2,构成扭曲的四方锥构型.其内部通过各种N-H?O弱相互作用形成超分子结构.CCDC:983583.     

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.     

8-氨基喹啉席夫碱锌配合物的合成,晶体结构及发光性质

合成了一个新的锌配合物[Zn(8-ahsb)(N3)](1)(8-ahsb=8-氨基喹啉水杨醛席夫碱阴离子),并对其进行了元素分析、红外光谱和X-射线单晶衍射表征.配合物1属于单斜晶系,空间群为C2/c,a=0.6762(3)nm,b=2. 2842(9)nm,c=1.8162(8)nm,β=91.309(7)°,V=2.805(2)nm3,Z=8.中心离子Zn(II)为三角双锥配位构型,分别与四个N原子、一个氧原子配位,其中1个8-氨基喹啉席夫碱配体提供了2个N原子、一个氧原子,剩余两个N原子分别来自于两个N3-阴离子,且每个N-3桥联邻近的两个Zn2+形成一维无限链状结构.荧光光谱的分析表明该化合物具有强的绿色发光性能,且可作为荧光探针检测低浓度的铜离子.     

樟脑酸构筑的铜、钴配合物的合成、晶体结构及电化学性质

分别采用普通溶液法和溶剂热法合成了两个以樟脑酸(D-H2Cam)为主配体的配合物.X射线单晶衍射分析结果表明:配合物[Cu(D-HCam)2(phen)]·2H2O (1)为单核配合物,四方晶系,P41212空间群,中心铜离子处于变形的四边形的配位环境;配合物{[Co(Hcam)2(4,4'-bipy)(H2O)2]·0.4(H2O)2·3.2H2O}n(2)为一维分子链,正交晶系,C2221空间群,有六个原子在钴原子周围形成一个稍变形的八面体配位环境.同时对两个配合物的热稳定性和电化学性质进行了研究.     

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.     

基于混合配体的镍(Ⅱ)配合物的晶体结构、荧光性质和磁性研究

室温下,以对氯苯乙酸(PCPA)、1,10-邻菲啰啉(phen)和六水合硫酸镍为原料,通过溶剂挥发法合成了镍配合物[Ni(PCPA)₂(phen)H₂O],并用X射线单晶衍射测定了该金属有机配合物的晶体结构。结果显示,配合物属于单斜晶系,P2₁/n空间群,每个不对称单元由一个镍(Ⅱ)离子、两个对氯苯乙酸配体和一个1,10-邻菲啰啉配体组成。荧光光谱分析结果表明,配合物的激发峰和发射峰分别在336 nm和393 nm;热稳定性分析表明,配合物在室温下稳定;磁性测量表明,配合物存在反铁磁相互作用。     

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, 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.     

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.     

X-Ray Crystal Structures of Two Monopentamethylcyclopentadienylhafnium(IV) Complexes

Crystallography Reports - The crystal structures of two monopentamethylcyclopentadienylhafnium(IV) derivatives have been determined by X-ray diffraction analysis. The [Hf(η5-C5Me5)Cl3] complex...