共查询到20条相似文献,搜索用时 156 毫秒
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采用溶剂热方法合成了两种具有良好发光性能的d-f异核金属配合物EuZn(C8H7O3)5(phen)(H2O)(1)和TbZn(C8H7O3)5(phen)(H2O)(2). 采用单晶X射线衍射表征了晶体结构. 结果表明, 两种配合物是同构的, 在配合物中, Zn为五配位, Ln(Ⅲ)[Ln(Ⅲ)=Eu, Tb]为八配位. 金属间通过对甲氧基苯甲酸根的羧基(—COO)基团成桥联结. 测定了配合物的紫外-可见吸收光谱、 红外光谱和荧光光谱. 讨论了配位环境对荧光性质的影响以及配合物分子内能量传递问题. 相似文献
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首次合成了四种N,N′-双(2-吡啶甲酰胺)-1,4-二乙烯三胺(L=C16H19N5O2)稀土配合物。经过元素分析、红外光谱、热重分析和摩尔电导值的分析,确定配合物的组成为[Ln(H3L)(NO3)2].NO3.C l3.3H2O,(Ln=La(Ⅲ),Eu(Ⅲ),Gd(Ⅲ),Ho(Ⅲ))。光谱测试结果表明:配体中两个酰胺基氧和两个吡啶氮分别与稀土离子配位,两个硝酸根均为双齿配体,稀土离子的配位数为8,Ln(Ⅲ)与H3L形成了1∶1的配合物。另外,进一步采用荧光光谱、表面增强拉曼光谱和粘度法研究了系列配合物与DNA的作用情况。研究结果表明,系列配合物与DNA之间存在相互作用,其作用模式主要为沟面结合和静电作用。 相似文献
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邻菲罗啉单氮氧化物(PhenNO),分子内存在较大的共轭π键,对过渡金属离子具有良好的配位性能,其中某些配合物具有荧光。迄今为止,Sc、Y与该配体的配合物尚未见文献报道。本文在非水介质中合成出Sc(Ⅲ)、Y(Ⅲ)盐与PhenNO的五个新配合物,研究了它们的组成及其有关性质。由于Sc(Ⅲ)和Y(Ⅲ)的离子半径不同,它们的配位行为及其配合物的性质应有差异,试验结果证实了预测的结果。 相似文献
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Agondanou JH Nicolis I Curis E Purans J Spyroulias GA Coutsolelos AG Bénazeth S 《Inorganic chemistry》2007,46(17):6871-6879
Many attempts to obtain single crystals appropriate for X-ray diffraction analysis of the Ln(tpp)(acac) derivatives (where Ln = Gd or Sm, tpp = tetraphenylporphyrin and acac = acetylacetonate) have failed so far. A suitable way to get structural parameters for these monoporphyrinates is to use extended X-ray absorption fine structure (EXAFS) spectroscopy. We recorded spectra of the monoporphyrins, Ln(tpp)(acac) and Gd(tpyp)(acac) (where tpyp = tetrapyridylporphyrin), and the bisporphyrin GdH(tpyp)2 in the solid state. We particularly focused our structural analysis on Gd(tpp)(acac), applying both molecular modeling and EXAFS, which allowed us to get accurate results about the local environment of the central atom. The Gd3+ ion of the complex at room temperature was found to be bonded to four monoporphyrin nitrogen atoms at an average distance R(Gd-N(av)) = 2.48 A and to three or four oxygen atoms at R(Gd-O(ac,w)) = 2.38 A from an acetylacetonato anion and a water molecule. The presence of the second water molecule in the coordination sphere was barely discernible by EXAFS analysis. Molecular modeling has provided further information about the coordination core geometry of the Gd(tpp)(acac) monoporphyrinate, including a bishydrated coordination sphere. Also, it has enabled the construction of a 3D structural model on which multiple scattering analyses were attempted. Monte Carlo simulation was used to validate the adjustments. EXAFS spectra analysis was carried out on the derivatives, displaying slight distortions in the lanthanide central-atom coordination geometry. 相似文献
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在乙腈和二氯甲烷混合溶液中合成了三价稀土元素(La, Nd, Eu, Dy, Er, Yb)硫氰酸盐与辛二酰双(4'-苯并-15-冠-5)的六个新配合物。并在氩气氛中, 以四氢呋喃为溶剂, 锂-萘为还原剂, 制得了二价铕硫氰酸盐与辛二酰双(4'-苯并-15-冠-5)的固体配合物。通过元素分析、红外光谱、差热热重分析、荧光光谱、穆斯堡尔谱、电子自旋共振谱、还原性实验等研究了双冠醚与稀土离子的配位作用, 并讨论了三价和二价稀土配合物在物理化学性质上的差别。 相似文献
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Yan PF Lin PH Habib F Aharen T Murugesu M Deng ZP Li GM Sun WB 《Inorganic chemistry》2011,50(15):7059-7065
The syntheses, structures, and magnetic properties are reported for four new lanthanide clusters [Sm(4)(μ(3)-OH)(2)L(2)(acac)(6)]·4H(2)O (1), [Gd(4)(μ(3)-OH)(2)L(2)(acac)(6)]·4CH(3)CN (2), and [Ln(4)(μ(3)-OH)(2)L(2)(acac)(6)]·2H(2)L·2CH(3)CN (3, Ln = Tb; 4, Ln = Dy) supported by salen-type (H(2)L = N,N'-bis(salicylidene)-1,2-cyclohexanediamine) and β-diketonate (acac = acetylacetonate) ligands. The four clusters were confirmed to be essentially isomorphous by infrared spectroscopy and single-crystal X-ray diffraction. Their crystal structures reveal that the salen-type ligand provides a suitable tetradentate coordination pocket (N(2)O(2)) to encapsulate lanthanide(III) ions. Moreover, the planar Ln(4) core is bridged by two μ(3)-hydroxide, four phenoxide, and two ketonate oxygen atoms. Magnetic properties of all four compounds have been investigated using dc and ac susceptibility measurements. For 4, the static and dynamic data indicate that the Dy(4) complex exhibits slow relaxation of the magnetization below 5 K associated with single-molecule magnet behavior. 相似文献
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本文合成了新的异双核化合物PdMo(μ-Ph~2Ppy)~2(μ-CO)(CO)~2I~2.0.5CH~2Cl~2, 对它进行了表征, 并测定其晶体和分子结构。该化合物属PI空间群, a=0.9500(2), b=1.1302(2), c=1.993(1)nm, α=102.82(3),β=101.21(3), γ=94.57(2)°, D~x=1.82g/cm^3, Z=2, R=0.064。晶体结构测定表明, 该化合物具有Pd-Mo键, 键长为0.28596(9)nm。如将Pd-Mo键考虑在内, Pd原子为d^9五配位构型, Mo原子为d^5七配位构型。两者的形式氧化态均为+1。 相似文献
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用镧系硝酸盐与1,6-双(1'-苯基-3'-甲基-5'-氧代吡唑-4'-基)-1,6-己二酮(1,H2L)和1,10-二氮杂菲(2, Phen)在乙醇-水溶液中, 于PH5-6时合成了12种新的固态配合物Ln2L3Phen2. 4H2O(Ln=Pr, Nd, Sm-Lu)。用元素分析、水份及配体分析、红外、紫外,质子核磁共振、荧光光谱和热分析鉴定了所有的配合物, 从而推测, 可能L是四啮配体,Phen是二啮配体。 相似文献
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The reaction of Ln(acac)(3).3H(2)O (Ln = Sm, Eu, Gd, Dy, Yb) with K[Cr(2)(CO)(10)(micro-H)] at different molar ratios and solvents leads to the formation of nonanuclear lanthanide hydroxo acetylacetonate complexes of general formula [Ln(9)(OH)(10)(acac)(16)][HCr(2)(CO)(10)]. The compounds are isomorphous, and the common cationic cluster core consists of a novel square antiprismatic arrangement of nine Ln atoms connected by micro(3), micro(4) hydroxo bridges and/or by acetylacetonate ligands as it results from the single-crystal X-ray analysis of the Sm derivative for which the most suitable crystals were obtained. 相似文献