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151.
含稀土铕(Ⅲ)配位聚合物的研究Ⅰ.铕(Ⅲ)-噻吩甲酰三氟丙酮-聚(苯乙烯-丙烯酸)的结构表征 总被引:2,自引:0,他引:2
研究了铕 (Ⅲ )和噻吩甲酰三氟丙酮 (HTTA)形成的有机配合物与聚 (苯乙烯 丙烯酸 )PSAA在不同pH值时发生配位反应得到配位聚合物NaEu(Ⅲ ) TTA PSAA的 3种样品 (a) ,(b) ,(c)。红外光谱、紫外光谱、X光电子能谱的测试表明了Eu3 分别与PSAA ,TTA- 发生配位。元素分析和电导率测定结果证明了配位组成和结构在不同的 pH条件下发生变化。结果表明 ,配合物试样 (a) ,(b) ,(c)中Eu3 的含量分别为11 89% ,12 5 5 % ,13 4 1%。 相似文献
152.
2-噻吩乙醛酸-邻菲罗啉-铕配合物的合成、结构表征及荧光性能的研究 总被引:9,自引:0,他引:9
合成了铕与 2 噻吩乙醛酸 (HL)和邻菲罗啉 (phen)的配合物 ,用元素分析、电导率、红外光谱和核磁共振谱测定了配合物的分子式为 [EuL2 phen·(H2 O) 3 ]NO3 ;配合物中的Eu(Ⅲ )离子与 2 噻吩乙醛酸和水分子中的O原子以及邻菲罗啉中的N原子配位。在室温下测定了配合物的激发和发射光谱 ,配合物中Eu(Ⅲ )离子的5D0 7F1和5D0 7F2 跃迁分别位于 5 92和 6 18nm。该固体配合物于室温下被紫外光激发可以发出强的特征红色荧光。IR光谱中 ,2 噻吩乙醛酸的特征吸收峰νCO (1719cm-1) ,νC—O(12 32cm-1) ,δO—H(90 9cm-1)在形成配合物后消失。在配合物中出现—COO-的反对称νas(16 4 2cm-1)和对称νs(14 0 8cm-1)伸缩振动吸收峰。在1HNMR谱图中 ,2 噻吩乙醛酸环上的 3个氢原子的化学位移形成配合物后移向高场 ,邻菲罗啉环上 4种不同环境的质子峰的化学位移形成配合物后向低场移动。从TG曲线可以看出 ,此配合物在常温至 2 5 0℃以下是稳定的。 相似文献
153.
Marina M. Lezhnina Edgar Jordan Sergej A. Klimin Jürgen Löns Hubert Koller Boris N. Mavrin Ulrich Kynast Prof. Dr. 《无机化学与普通化学杂志》2009,635(3):450-455
In the course of investigations on optical properties resulting from the interaction of fluorides with alumosilicate host materials and rare earth guests, a well defined BF4– ion wasfound to be incorporated within the sodalite of composition Na8Al6Si6O24(BF4)2. The resulting cubic molecular structure, which was determined by Rietveld methods (space group P4 n, a = 906.91 pm, wRp = 0.045, Rp = 0.027), contains one anion in each sodalite cage and is, contrarily to expectations, thermally stable. NMR spectroscopic investigations indicated a fast rotatory motion of the BF4– tetrahedra at room temperature and agreed with the tetrahedral BF4– ions found in IR and Raman spectra. Preliminary attempts to obtain a luminescent material by incorporation of Eu3+ through aqueous ion exchange only yielded low rare earth concentrations, giving rise to characteristic red emission lines at 581 nm (5D0 → 7F1) and 615 nm (5D0 → 7F2) in a 1:2 intensity ratio. The material unexpectedly exhibited a strong broad band emission at 520 nm after calcination under Ar, which is attributed to the formation of an Eu2+ species. Further calcination under air partially reestablished the Eu3+ emission. 相似文献
154.
Yuko Hasegawa Shuhei Saitou Sayaka Tamaki Hirofumi Yajima Makoto Tadokoro 《Helvetica chimica acta》2009,92(11):2565-2575
The UV, excitation, and luminescence spectra of tris(pivaloyltrifluoroacetonato)europium(III) ([Eu(pta)3]; Hpta=1,1,1‐trifluoro‐5,5‐dimethylhexane‐2,4‐dione=HA) were measured in the presence of bis(salicylidene)trimethylenediamine (H2saltn), bis[5‐(tert‐butyl)salicylidene]trimethylenediamine (H2(tBu)saltn), or bis(salicylidene)cyclohexane‐1,2‐diyldiamine (H2salchn), and the corresponding ZnII complexes [ZnB] (B=Schiff base). The excitation and luminescence spectra of the solution containing [Eu(pta)3] and [Zn(salchn)] exhibited much stronger intensities than those of solutions containing the other [ZnB] complexes. The introduction of a tBu group into the Schiff base was not effective in sensitizing the luminescence of [Eu(pta)3]. The luminescence spectrum of [ZnB] showed a band around 450 nm. The intensity decreased in the presence of [Eu(pta)3], reflecting complexation between [Eu(pta)3] and [ZnB]. On the basis of the change in intensity against the concentration of [ZnB], stability constants were determined for [Eu(pta)3Zn(saltn)], [Eu(pta)3Zn{(tBu)saltn}], and [Eu(pta)3Zn(salchn)] as 4.13, 4.9 and 5.56, respectively (log , where =[[Eu(pta)3ZnB]]([[Eu(pta)3]][[ZnB]])?1). The quantum yields of these binuclear complexes were determined as 0.15, 0.11, and 0.035, although [Eu(pta)3Zn(salchn)] revealed the strongest luminescence at 613 nm. The results of X‐ray diffraction analysis for [Eu(pta)3Zn(saltn)] showed that ZnII had a coordination number of five and was bridged with EuIII by three donor O‐atoms, i.e., two from the salicylidene moieties and one from the ketonato group pta. 相似文献
155.
Craig P. Montgomery Elizabeth J. New Lars O. Palsson David Parker Andrei S. Batsanov Laurent Lamarque 《Helvetica chimica acta》2009,92(11):2186-2213
A series of seven emissive europium(III) and terbium(III) complexes was prepared, incorporating a 3‐pyridyl‐4‐azaxanthone or 3‐pyrazolyl‐4‐azaxanthone sensitising moiety within a polydentate macrocyclic ligand. High overall emission quantum yields in aqueous media are attenuated in the presence of protein or certain oxy anions due to displacement of the N,N′‐chelated sensitiser. Nevertheless, these complexes are taken into cells and tend to localise over the first few hours in mitochondria before being trafficked to endosomal compartments. Cell uptake studies, in the presence of competitive inhibitors or promoters of well‐defined uptake pathways, reveal a common uptake mechanism involving macropinocytosis. 相似文献
156.
Z.?Gabelica A.?Charmot R.?Vataj R.?Soulimane J.?Barrault S.?ValangeEmail author 《Journal of Thermal Analysis and Calorimetry》2009,95(2):445-454
Nanometric Fe2O3 particles could be inserted inside the internal pore volume of SBA-15 mesoporous silica and mesoporous alumina supports,
when Fe(III) chelates (EDTA, gluconate or citrate) were used as impregnating precursors. The oxidative degradation of the
chelating anions was followed by combined TG-DTA. Strong chelate-SiOH interactions (case of bulky EDTA), favored by the mesopore
curvature, yield sub-nanometric extremely well dispersed Fe2O3 particles preferentially located at the micropore mouths (confinement effect). Fe2O3 even more strongly interacts with alumina walls, generating either (Fe,Al)2O3 mixed phases or Fe-aluminate micro domains. These iron-based mesoporous alumina composites proved very active catalysts in
total oxidation of phenol at ambient conditions, with extremely low iron leaching (0.2%). 相似文献
157.
Sergij Budnyk Christof Kubata Yurii Prots Walter Schnelle Reinhard Nesper Frank R. Wagner 《Journal of solid state chemistry》2006,179(8):2329-2338
Formation and crystal structure of the binary germanide Eu3Ge5 were investigated in detail. The compound forms peritectically at 1008 °C and does not undergo any phase transition down to room temperature. The crystal structure was determined first from X-ray powder diffraction data and was later confirmed by single-crystal X-ray diffraction: structure type Pu3Pd5, space group Cmcm (no. 63), , , . The main building blocks are Ge56− cluster anions surrounded by Eu2+ cations. The nearly tetragonal-pyramidal shape is suggested by the interatomic distances. Contrary to that, the bonding analysis with the electron localization function (ELF) reveals only two- and three-bonded germanium atoms forming a strongly distorted [1.1.1]-barrelane-like cluster. Despite the formal electron deficiency, compared to the barrelane C5H8, the electron counting in the cluster anion and its conformation cannot be interpreted applying the Wade's rules. In accordance with the calculated electronic density of states, Eu3Ge5 shows a metal-like temperature dependence of the electrical resistivity with a sharp change of ρ(T) slope at the Néel point. Above the Néel point the inverse magnetic susceptibility reveals Curie-Weiss behavior with an effective moment of 8.11 μB (Eu2+, 4f7 configuration) in agreement with the analysis of the chemical bonding. The 4f7 electronic configuration of europium is confirmed by Eu-LIII X-ray absorption spectroscopy. 相似文献
158.
The crystal structure and luminescent property of hydrothermally grown crystals of [NaEu(H2O)(SO4)2] (1) are reported. The crystal structure is composed of three kinds of right-handed helical chains, {EuOSO4}, {NaOSO4} and {EuONa}, which are connected together to form a three-dimensional framework structure via corner-shared polyhedra. The sharp peaks in the emission spectrum of 1 are assigned and analyzed. Crystal data: Trigonal, P3121, with , and z=3. 相似文献
159.
Yu-Long Sui 《Applied Surface Science》2006,252(12):4306-4311
In this study, silica-based organic-inorganic hybrids were prepared by the sol-gel method. Tetraethoxysilane (abbreviated as TEOS) and a kind of monomer (abbreviated as FA-APES) derived from modified 2-furancarboxylic acid (abbreviated as FA) with (3-aminopropyl)triethoxysilane (abbreviated as APES) were used as the inorganic and organic fragments, respectively. Coordination reaction between lanthanides (europium and terbium ions) and CO group of the monomer happened simultaneously. And after days of aging process the resultant materials showed characteristic luminescence of lanthanides. The enhancement of luminescence can be seen by the comparison with simply doped lanthanide hybrid systems. And it can be explained by the coordination ability of the organic counterpart. IR, NMR, UV-vis absorption, low-temperature phosphorescence spectroscopy and fluorescence spectroscopy were applied to characterize and the above spectroscopic data revealed that the triplet state energy of organic ligand matches with the emissive energy level of lanthanides (especially of Tb3+). 相似文献
160.
基于邻菲咯啉的反应型三元铕配合物的合成与荧光性质 总被引:1,自引:0,他引:1
以二苯甲酰甲烷(HDBM)为第一配体,5-丙烯酰胺基-1,10-菲咯啉(Aphen)为活性第二配体,制备了新的反应型三元铕配合物Eu(DBM)3Aphen。通过元素分析、红外光谱和热分析对配合物进行了组成确定,采用紫外光谱、荧光光谱、荧光寿命和荧光量子产量研究了配合物的光物理性能。结果表明,在紫外光激发下,配合物Eu(DBM)3Aphen能发射Eu3+的特征荧光,其荧光发射强度、单色性、荧光寿命和荧光量子产率等均显著高于文献报道的丙烯酸配合物Eu(DBM)2AA的相应数值,表明配合物Eu(DBM)3Aphen不仅可作为潜在的红色发光材料,还可作为反应型的配合物,为制备具有优异发光性能的稀土聚合物提供了一条新的途径。 相似文献