酰胺型开链冠醚类稀土配合物的合成及其与DNA的作用研究

以2,3-二羟基萘为母体,以稀土元素为中心离子,与苦味酸盐(pic)反应合成了3个末端基不同的酰胺型开链冠醚类稀土配合物。用红外吸收光谱、元素分析、摩尔电导率、差热-热重分析等方法对配体和配合物的组成和结构进行了表征分析。通过紫外光谱、荧光光谱、黏度和循环伏安法对配合物的荧光性质及与DNA的作用方式进行了研究。结果表明:该系列配合物的组成为RE(pic)3L(L1=C26H22N2O4,L2=C30H30N2O4,L3=C28H26N2O4;RE=Eu(Ⅲ),Tb(Ⅲ),Ce(Ⅲ),Y(Ⅲ))。Eu(Ⅲ)配合物荧光强度较强,Tb(Ⅲ)配合物次之,该类配体对Eu3+的敏化效果强于对Tb3+的。配合物与DNA的作用模式均为插入式,且Eu(pic)3L3配合物与DNA的键合作用最强。     

新的β-二酮及其Eu(Ⅲ)配合物的合成表征及荧光性能研究

合成了一种新的β-二酮,2-吡啶甲酰苯甲酰甲烷(HPBM),以元素分析和1H NMR谱确定了其组成,核磁和红外分析结果表明HPBM主要以烯醇式存在.以HPBM作配体采用溶液析出法合成了Eu(Ⅲ)的二元配合物,并以邻菲罗啉(Phen)、三苯基氧膦(TPPO)作为第二配体合成了两种新的三元配合物,用元素分析、红外光谱、紫外可见吸收光谱和荧光光谱进行了表征.荧光光谱研究表明:配体与EuM3+之间存在着有效的能量传递,且显示Phen和TPPO对配合物有较强的敏化作用.发射光谱表明三种配合物均显示Eu3+离子的特征发射光谱,发射谱线很窄,主发射峰为Eu3+的5D0-7F2发射.三种配合物中Eu(PBM)3(TPPO)(H2O)2发光强度最高,是具有一定应用价值的红色高亮发光材料.     

新型稀土Eu,Tb(Ⅲ)芳香羧酸配合物的合成及发光性能

以2-二苯胺羰基苯甲酸(L)为第一配体,咪唑并[5,6-f]邻菲罗啉(IP)为第二配体,合成出新型稀土铕、铽三元配合物。采用元素分析、红外光谱、紫外-可见光谱对配体和配合物的结构进行了表征。红外光谱分析表明配合物中的稀土离子与第一配体L中的氧原子以及第二配体IP中的氮原子进行了配位。紫外光谱表明配合物主要是由第一配体L吸收能量。通过荧光光谱、荧光量子效率和荧光寿命研究了配合物的荧光性能,结果显示:两种配合物均表现出稀土离子的特征发射,且配合物的荧光量子效率和荧光寿命与发光强度成正比,配合物Tb(L)3IP的各项荧光性能均优于Eu(L)3IP。     

铕-8-羟基喹啉-噻吩甲酰基三氟丙酮三元固体配合物的合成和表征

以8-羟基喹啉(8HOQ)、噻吩甲酰基三氟丙酮(TTA)为配体合成了稀土固体三元配合物。元素分析表明配合物的组成为Eu(TTA)(8HOQ)2·H2O。红外光谱、紫外光谱分析表明配合物中配体TTA和8HOQ均与稀土螯合配位。荧光光谱分析表明,合成的配合物根据激发光的不同,可发射蓝光和红光。以326nm激发时,发射415nm左右的蓝光和617nm的红光的混合光;以348nm激发时,主要发射618nm的红光。蓝光来自配体8HOQ的发射,而红光来自稀土离子的发射。配体TTA和稀土Eu3+之间存在高效率的能量传递。     

氨基吡嗪型双齿席夫碱配基功能化聚砜的制备及其与Tb(Ⅲ)离子配合物的荧光发射特性

首先,通过苯甲醛(BA)改性的聚砜(BA-PSF)与氨基吡嗪(AP)发生席夫碱反应,制得了侧链含氨基吡嗪型双齿席夫碱配基(APSB)的功能化聚砜APSB-PSF。使用核磁共振氢谱(~1HNMR)、红外光谱(FT-IR)表征其化学结构。然后,以APSB-PSF为大分子配体,邻菲罗啉(Phen)为第二配体,使它们与Tb(Ⅲ)离子进行配位螯合反应,分别制备了二元高分子-稀土配合物Tb(Ⅲ)-(APSB)_3-PSF与三元配合物(Phen)_1-Tb(Ⅲ)-(APSB)_3-PSF,研究了配合物Tb(Ⅲ)-(APSB)_3-PSF和(Phen)_1-Tb(Ⅲ)-(APSB)_3-PSF的荧光发射特性与发光机理。实验结果表明,大分子配体APSB-PSF不但能够强烈地吸收紫外光,且其本身荧光强度很高;当APSB-PSF与Tb(Ⅲ)离子配位生成新的二元配合物后,其自身的吸光强度基本不变,但荧光强度却大为削弱,即能量发生了转移,该配合物同时发射出Tb(Ⅲ)离子的特征荧光,且由于接受了APSB-PSF转移的能量使其发光强度大大增强,即APSB-PSF对Tb(Ⅲ)离子发生了敏化作用。而配体APSB-PSF的三线态与Eu(Ⅲ)离子的共振能级不匹配,使APSB-PSF与Eu(Ⅲ)离子的配合物几乎不发射荧光。三元配合物不仅发射出Tb(Ⅲ)离子的特征荧光,且其发光强度高于二元配合物。     

稀土2-[2-(4-苯甲酸甲酯)乙烯基]-8-羟基喹啉配合物的合成、表征及荧光性质

在甲醇体系中,用常规溶液法由自行设计合成的配体2-[2-(4-苯甲酸甲酯)乙烯基]-8-羟基喹啉(C_(19)H_(15)NO_3, HL)和稀土硝酸盐(Ln(NO_3)_3·nH_2O)反应合成了6个相应的配合物[Ln(NO_3)(L)_2](Ln=Nd,1; Sm,2; Eu,3; Gd,4; Tb,5; Dy,6);配体用红外光谱、核磁共振、单晶X射线衍射进行表征和结构测定;配合物用元素分析、红外光谱、摩尔电导、热重分析进行表征。室温下,测定了配体和配合物的荧光光谱及配合物的荧光寿命,结果表明:配体本身在575 nm处有较强的荧光发射,当形成配合物后,仍然表现为配体的发光而没有出现稀土中心离子的特征发光;与此同时,依中心离子的不同出现了不同程度的荧光增强或减弱现象,并伴随一定程度的红移或蓝移现象。     

N_3非对称配体、稀土配合物的合成及其在DNA传感器中的应用

合成具有三脚架形结构的配体L及其稀土配合物。用元素分析、红外光谱、核磁共振波谱、热分析、紫外吸收光谱、荧光光谱等方法对L及其配合物的结构进行表证,用光谱法和电化学法分析配合物与BSA,DNA之间的相互作用,并考查其作为杂交探针在DNA传感器方面的应用。结果表明,每1个L中C=O,P=O,P-O上O均可与稀土离子Eu~(3+),Y~(3+)配位,L与苦味酸配体以1∶1配位,化学式为RE(pic)_3L·3H_2O (RE=Eu,Y); Eu(Ⅲ)配合物对BSA内源荧光以静态方式淬灭,能量为非辐射转移,两者之间主要存在氢键和范德华力; Eu(Ⅲ)配合物与ct-DNA之间以嵌插作用结合,且在实验范围内有电化学活性; Eu(Ⅲ)配合物可以识别电极上的杂交过程,对互补、非互补、错配序列有较好的选择性。     

双齿席夫碱配基功能化的聚砜与Eu(Ⅲ)离子所形成的高分子-稀土配合物的制备及其荧光发射特性

通过分子设计,经过几步大分子反应,在聚砜(PSF)侧链键合了双齿席夫碱(SB)配基,制得了双齿席夫碱配基功能化的聚砜(PSF-SB)。在此基础上,以PSF-SB为大分子配体,以邻菲咯啉(Phen)为小分子配体,与Eu(Ⅲ)离子螯合配位,分别制备了二元高分子-稀土发光配合物PSF-(SB)3-Eu(Ⅲ)与三元高分子-稀土发光配合物PSF-(SB)3-Eu(Ⅲ)-(Phen)1,采用红外光谱和紫外吸收光谱对配合物进行了表征。研究了配合物的荧光发射性能与发光机理。制备了配合物的固体薄膜,考察了固体薄膜的荧光发射性能。结果表明,大分子配基PSF-SB本身具有强的荧光发射,但与Eu(Ⅲ)离子配位后,其自身的荧光发射大为减弱,其与Eu(Ⅲ)离子所形成的二元或三元高分子-稀土配合物均能发射出很强的Eu(Ⅲ)离子的特征荧光,即键合在PSF侧链的双齿席夫碱配基能有效地产生分子内能量转移,强烈地敏化Eu(Ⅲ)离子的荧光发射。第二配体的协同配位效应与对配位水分子的置换作用使得三元配合物的荧光发射强度高于二元配合物。     

铕-3-(2-萘甲酰基)-2-苯基苯并二氢吡喃-4-酮-邻菲罗啉配合物的合成及荧光性能研究

为了探讨2,3-二氢黄酮类化合物在发光材料方面的应用,首先合成了2,3-二氢黄酮类衍生物[3-(2-萘甲酰基)-2-苯基苯并二氢吡喃-4-酮(L)]配体,然后利用Eu(III)与此配体和水/邻菲罗啉(Phen)反应得到两种新型的红色荧光配合物。运用元素分析、红外光谱与荧光光谱等手段对相关物质进行了系统的表征。表征结果表明:两个新配合物的组成分别为Eu(L)3·2H2O和Eu(L)3·Phen;荧光光谱研究显示,两种配合物的配体能将吸收的能量有效地传递给铕离子,从而使配合物发射出强的铕离子的特征荧光,且两个配合物Eu(L)3·2H2O和Eu(L)3·Phen均以5D0→7F2跃迁的荧光发射最强。得到了两种新的高效的红色荧光材料。     

新型铕,铽(Ⅲ)三元配合物的合成、表征及发光性能

采用Claisen缩合反应设计合成了β-二酮配体1-(4-溴苯)-4,4,4-三氟丁烷-1,3-二酮(BPT),并合成了相应的新型稀土Eu,Tb(Ⅲ)三元配合物。通过元素分析、1H NMR谱、红外光谱、紫外光谱、荧光光谱和磷光光谱技术对合成的产物进行了表征和分析。红外光谱分析表明:BPT中存在着酮式-烯醇式互变;配合物中的稀土离子与BPT中的氧原子以及Phen中的氮原子形成了配位键。紫外光谱表明配合物主要是由第一配体BPT吸收能量。荧光光谱显示Eu(BPT)3Phen的发光强度较大,进一步的研究表明,BPT的最低三重态能级与Eu3+的5D0能级匹配较好。     

Ce3+,Tb3+,Eu3+共掺杂Sr2MgSi2O7体系的白色发光和能量传递机理

通过正交试验,采用高温固相法制备了Sr2-x-y-zMgSi2O7∶xCe3+,yTb3+,zEu3+系列样品.使用X射线衍射仪和荧光光谱仪表征了样品的物相和发光性质,并讨论了Ce3+-Tb3+-Eu3+共掺杂Sr2MgSi2O7体系中的能量传递过程.实验结果表明,在327 nm波长激发下,所合成荧光粉的发射峰主要位于387 nm(蓝紫)、542nm(绿)和611 nm(红)处;分别以387,542和611 nm为监控波长,所得激发光谱显示荧光粉在327 nm处有最好的激发.在327 nm光激发下,系列样品发光进入白光区.最优化的荧光粉为Sr1.91MgSi2O7∶0.01Ce3+,0.05Tb3+,0.03Eu3+,其色坐标为(0.337,0.313),是一种潜在的发光二极管(LED)用白色荧光粉.     

铕-芦氟沙星的氧化产物- EDTA 配合体系的敏化荧光

提出了测定人体尿液中芦氟沙星的 Eu3＋敏化荧光法,研究了芦氟沙星在 HAc介质中被 H2O2氧化的反应机理。在近中性 HAc－ NaAc缓冲溶液中芦氟沙星的氧化产物与 Eu3＋、 EDTA形成三元络合物,产生 Eu3＋的特征荧光（λ em 617 nm、λ ex 352 nm）,其荧光强度与芦氟沙星的浓度成线性关系。尿液标准曲线线性范围 5.0× 10－ 8～ 2.5× 10－ 6 mol/L,检出限 1.5× 10－ 8 mol/L。方法简单、快速、灵敏。     

(-)-2，2′-(2，5-噻吩二甲酰氨基)二丙氨酸和4，4′-联吡啶构筑的铕配位聚合物的水热合成、晶体结构及性质研究

以(-)-2,2′-(2,5-噻吩二甲酰氨基)二丙氨酸(C12H14N2O6S)及4,4′-联吡啶(4,4′-bipy)为配体,在水热条件下合成了铕配位聚合物{[Eu2(C12H12N2O6S)3(4,4′-bipy)(H2O)2].(H2O)6}n。通过X-射线单晶衍射仪测定其结构,结果表明:晶体为正交晶系,晶胞参数a=1.113 992(18)nm,b=1.804 972(19)nm,c=2.933 80(3)nm,Z=4;2个Eu原子分别为九和八配位。测定发现配合物固体具有Eu3+的典型光致发光光谱,配合物中配体能有效提高稀土离子的发光效果。并通过热重分析对配合物进行了热稳定性研究。     

From model compounds to protein binding: syntheses, characterizations and fluorescence studies of [RuII(bipy)(terpy)L]2+ complexes (bipy = 2,2'-bipyridine; terpy = 2,2':6',2''-terpyridine; L = imidazole, pyrazole and derivatives, cytochrome c)

Compounds [RuII(bipy)(terpy)L](PF6)2 with bipy = 2,2'-bipyridine, terpy = 2,2':6',2"-terpyridine, L = H2O, imidazole (imi), 4-methylimidazole, 2-methylimidazole, benzimidazole, 4,5-diphenylimidazole, indazole, pyrazole, 3-methylpyrazole have been synthesized and characterized by 1H NMR, ESI-MS and UV/Vis (in CH3CN and H2O). For L = H2O, imidazole, 4,5-diphenylimidazole and indazole the X-ray structures of the complexes have been determined with the crystal packing featuring only few intermolecular C-H...pi or pi-pi interactions due to the separating action of the PF6-anions. Complexes with L = imidazole and 4-methylimidazole exhibit a fluorescence emission with a maximum at 662 and 667 nm, respectively (lambdaexc= 475 nm, solvent CH3CN or H2O). The substitution of the aqua ligand in [Ru(bipy)(terpy)(H2O)]2+ in aqueous solution by imidazole to give [Ru(bipy)(terpy)(imi)]2+ is fastest at a pH of 8.5 (as followed by the increase in emission intensity). Coupling of the [Ru(bipy)(terpy)]2+ fragment to cytochrome c(Yeast iso-1) starting from the Ru-aqua complex was successful at 35 degrees C and pH 7.0 after 5 d under argon in the dark. The [Ru(bipy)(terpy)(cyt c)]-product was characterized by UV/Vis, emission and mass spectrometry. The location where the [Ru(bipy)(terpy)] complex was coupled to the protein was identified as His44 (corresponding to His39 in other numbering schemes) using digestion of the Ru-coupled protein by trypsin and analysis of the tryptic peptides by HPLC-high resolution MS.     

Stoichiometry, stability constants and coordination geometry of Eu(III) 5-sulfosalicylate complex in aqueous system-A TRLIFS study

The complex formation between Eu(III) and 5-sulfosalicylate, (HSSA)(2-), has been investigated by means of TRLIFS (time resolved laser induced fluorescence spectroscopy). The concentration of free ligand in the solution was determined from the fluorescence emission of 5-sulfosalicylate by subtracting the dynamic quenching effect from the observed quenching of fluorescence emission by means of lifetime analysis, and the stoichiometry and the corresponding formation constants were obtained. A carboxylate coordinated complex, Eu(HSSA)(+), and also a chelate complex, Eu(SSA), were identified, and the formation constants of the complex Eu(HSSA)(2+) for the reaction, Eu(3+)+ HSSA(2-)[rightward arrow] Eu(HSSA)(+), and the deprotonation constant of the chelating reaction, Eu(HSSA)(+)--> Eu(SSA)+ H(+), were calculated at log beta(1,1)= 1.79 and log K'=-5.78, respectively. TRLIFS using the fluorescence emission from Eu(III) was performed in order to determine the number of coordination waters of the complex Eu(HSSA)(2+). The quenching of the Eu(III) fluorescence caused by (SSA)(3-) disturbed the lifetime analysis of the 'intrinsic lifetime' of Eu(III) in Eu(HSSA)(2+), however the problem was successfully solved by the analysis of emission intensity and lifetime, and the formulation of the complex was determined as [Eu(HSSA)8H(2)O](2+) with the explicit involvement of the coordinated waters.     

Highly luminescent, triple- and quadruple-stranded, dinuclear Eu, Nd, and Sm(III) lanthanide complexes based on bis-diketonate ligands

The bis(beta-diketone) ligands 1,3-bis(3-phenyl-3-oxopropanoyl)benzene, H(2)L(1) and 1,3-bis(3-phenyl-3-oxopropanoyl) 5-ethoxy-benzene, H(2)L(2), have been prepared for the examination of dinuclear lanthanide complex formation and investigation of their properties as sensitizers for lanthanide luminescence. The ligands bear two conjugated diketonate binding sites linked by a 1,3-phenylene spacer. The ligands bind to lanthanide(III) or yttrium(III) ions to form neutral homodimetallic triple stranded complexes [M(2)L(1)(3)] where M = Eu, Nd, Sm, Y, Gd and [M(2)L(2)(3)], where M = Eu, Nd or anionic quadruple-stranded dinuclear lanthanide units, [Eu(2)L(1)(4)](2-). The crystal structure of the free ligand H(2)L(1) has been determined and shows a twisted arrangement of the two binding sites around the 1,3-phenylene spacer. The dinuclear complexes have been isolated and fully characterized. Detailed NMR investigations of the complexes confirm the formation of a single complex species, with high symmetry; the complexes show clear proton patterns with chemical shifts of a wide range due to the lanthanide paramagnetism. Addition of Pirkle's reagent to solutions of the complexes leads to splitting of the peaks, confirming the chiral nature of the complexes. Electrospray and MALDI mass spectrometry have been used to identify complex formulation and characteristic isotope patterns for the different lanthanide complexes have been obtained. The complexes have high molar absorption coefficients (around 13 x 10(4) M(-1)cm(-1)) and display strong visible (red or pink) or NIR luminescence upon irradiation at the ligand band around 350 nm, depending on the choice of the lanthanide. Emission quantum yield experiments have been performed and the luminescence signals of the dinuclear complexes have been found to be up to 11 times more intense than the luminescence signals of the mononuclear analogues. The emission quantum yields and the luminescence lifetimes are determined to be 5% and 220 micros for [Eu(2)L(1)(3)], 0.16% and 13 micros for [Sm(2)L(1)(3)], and 0.6% and 1.5 micros for [Nd(2)L(1)(3)]. The energy level of the ligand triplet state was determined from the 77 K spectrum of [Gd(2)L(1)(3)]. The bis-diketonate ligand is shown to be an efficient sensitizer, particularly for Sm and Nd. Photophysical studies of the europium complexes at room temperature and 77 K show the presence of a thermally activated deactivation pathway, which we attribute to ligand-to-metal charge transfer (LMCT). Quenching of the luminescence from this level seems to be operational for the Eu(III) complex but not for complexes of Sm(III) and Nd(III), which exhibit long lifetimes. The quadruple-stranded europium complex has been isolated and characterized as the piperidinium salt of [Eu(2)L(1)(4)](2-). Compared with the triple-stranded Eu(III) complex in the solid state, the quadruple-stranded complex displays a more intense emission signal with a distinct emission pattern indicating the higher symmetry of the quadruple-stranded complex.     

Efficient electroluminescence from new lanthanide (Eu3+, Sm3+) complexes

The syntheses, structures, and electroluminescent properties are described for two new lanthanide complexes Ln(HFNH)3phen [HFNH = 4,4,5,5,6,6,6-heptafluoro-1-(2-naphthyl)hexane-1,3-dione; phen = 1,10-phenanthroline; Ln = Eu3+ (1), Sm3+ (2)]. Both complexes exhibit bright photoluminescence at room temperature (RT) due to the characteristic emission of Eu3+ and Sm3+ ion. Several devices using the two complexes as emitters were fabricated. The performances of these devices are among the best reported for devices using europium complex and samarium complex as emitters. The device based on 1 with the structure ITO/TPD (50 nm)/1:CBP (10%, 40 nm)/BCP (20 nm)/AlQ (30 nm)/LiF (1 nm)/Al (200 nm) exhibits the maximum brightness of 957 cd/m2, current efficiency of 4.14 cd/A, and power efficiency of 2.28 lm/W with a pure red Eu3+ ion emission. Especially, at the high brightness of 200 cd/m2, the device of 1 still has a high current efficiency of 2.15 cd/A. The device of 2 with a three-layer structure of ITO/TPD (50 nm)/2 (50 nm)/BCP (20 nm)/LiF (1 nm)/Al (200 nm) gives the maximum brightness of 42 cd/m2, current efficiency of 0.18 cd/A. By the comparison of the electroluminescent properties of devices based on Eu(TTA3phen (TTA = 2-thenoyltrifluoroacteonate) and 1, we conclude that the polyfluoration on the alkyl group of the ligand and the introduction of the long conjugate naphthyl group into the ligand improve the efficiency of 1-doped devices, especially at high current densities.     

两个二维Cd(Ⅱ)配位聚合物的合成、晶体结构和荧光性质

具有d^10电子结构的简单金属配合物是不发光的。然而,采用具有π共轭芳香类有机物为配体所构建的Zn(Ⅱ)和Cd(Ⅱ)配合物,特别是具有重复单元结构的配位超分子和配位聚合物,能够发射较强的荧光,由于它们的配位数和结构的多样性,如[Cd4(betc)2(phen)2(H2O)]n(bete=1,2,4,5-benzenetetracarboxyl),[Cd(isonicotinate)2(EtOH)](EtOH),使这类化合物往往显示出一些新奇的功能。本文分别采用均苯四甲酸根和烟酸根为桥配体,合成了两种具有二维无限结构的Cd(Ⅱ)配位聚合物,它们在紫外光照射下,可以发出较强的蓝色荧光。     

镧系金属有机骨架比例荧光检测萘普生

该文构筑了双荧光发射的比例型荧光传感器,并将其用于萘普生检测。以Eu3+为金属节点,1,3,5-苯三甲酸为配体,通过超声法合成了比例型荧光传感材料Eu-MOF。探究了Eu-MOF的形貌特征、光学性质及对萘普生的检测机理。单一激发光照射下,Eu-MOF呈现源于配体和Eu3+的双荧光发射峰。萘普生的荧光发射峰与Eu-MOF在375 nm处的荧光发射峰重合,且两者之间具有内滤光效应。因此,随着萘普生的逐渐加入,Eu-MOF在375 nm处的荧光发射峰强度逐渐增强,而623 nm处则逐渐减弱,从而可实现对萘普生的比例荧光检测。Eu-MOF检测萘普生的线性范围为0.07~2.3μmol/L,检出限为0.039μmol/L。Eu-MOF在萘普生的检测中表现出良好的选择性和抗干扰能力,是实际样品中萘普生检测的优势材料。     

含有电子传输基团的双齿配体及铕配合物Eu(DBM)3(DPOP)的制备与发光性能的研究

1, 3, 4-oxadiazole-contanining ligand DPOP(DPOP=2-(11-dipyrido[3, 2-a: 2′, 3′-c]phenazine)-5-p-tolyl-1, 3, 4-oxadiazole) was synthesized by a convenient method and characterized by elemental analysis, IR, ¹H NMR. Then, corresponding Eu(Ⅲ) complex [Eu(DBM)₃(DPOP)] (DBM=1, 3-diphenyl-1, 3-propanedionate) was prepared and characterized by elemental analysis, IR. The photophysical properties of ligand and its europium complex were investigated. The ligand emitted at 443 nm. There were different PL spectra in solid state and in solution of Eu(DBM)₃(DPOP). There are two fluorescent peaks at 614 nm, 400 nm in dichloromethane solution of Eu(DBM)₃(DPOP), but in solid state only red emission was observed. This result indicated that efficient energy tranfer could take place from DPOP ligand to europium ion in Eu-complex solid.