Sm^2＋在CsSmI3中的能级结构研究

报道了三元低价稀土碘化物CsSmI3中Sm^2 的激发光谱,反射光谱,根据J1T级分裂的相关理论确定了Sm2 在CsSmI3化合物中的超精细能级结构,并利用此能级结构 对激光光变和反射光谱进行了指认。     

溶胶-凝胶法制备掺Sm3+的SiO2玻璃的结构及发光性能

利用溶胶-凝胶技术制备了掺不同量Sm3+和不同退火温度下的SiO2凝胶和玻璃,通过三维荧光光谱、激发光谱、发射光谱的测试,确定了Sm3+在SiO2凝胶玻璃中的最佳激发波长为360 nm,最强发射波长为610 nm,激发光谱的峰位置在360、393、464 nm处,发射光谱的峰位置在578、591、595、610、732nm处,分别归属于4G5/2-6H5/2、4G5/2-6H7/2、4G5/2-6H11/2跃迁,并证明当掺杂量达到1.15%时,Sm3+的发光最强,当Sm3+的掺杂量超过1.15%时,发生浓度猝灭效应.     

橙红色荧光粉Ca_(1-x-y)Sm_xBi_ySiO_3的制备及其发光性能

以Sm3+作为激活剂,Bi3+作为辅助激活剂,采用水热法合成Ca1-x-ySmxBiySi O3前驱体,然后在1 100℃焙烧得到系列橙红色荧光粉。用X-射线衍射仪、扫描电镜和荧光分光光度计和傅里叶变换红外光谱等手段对样品的组成、结构和形貌及其发光性质进行分析和表征。分析结果表明:产物都为三斜晶系结构的Ca1-x-ySmxBiySi O3和四方结构的方石英Si O2共熔体。在405 nm近紫外光激发下,产物的发射光谱由3个峰组成,发射峰值位于566、606和650 nm处,分别归属于Sm3+的4G5/2→6HJ/2(J=5,7,9)跃迁。产物的激发光谱在405 nm有很强的发射带,与近紫外LED芯片匹配。随着Sm3+掺量的增加,样品发光强度先增强后减弱,当Sm3+的物质的量分数为3%时发光强度达到最大,浓度猝灭机理为电偶极-电偶极相互作用。当Bi3+的物质的量分数在0.3%~1.5%时,对产物Ca0.97Sm0.03Si O3的荧光强度起敏化作用。Sm3+和Bi3+的最佳物质的量分数分别为3%和0.5%。     

CaS：Ce，Sm的制备及性能表征

采用碳还原法制备了CaS：Ce，Sm样品，并研究了反应机理、还原原理以及灼烧温度对CaS晶格形成和光激励发光的影响。样品的XRD测试表明，采用碳还原法制备的CaS：Ce，Sm样品，具有纯CaS的面心立方结构，晶格常数a=0.569 4 nm，样品的激发光谱是峰值分别位于295 nm和461 nm的宽带谱，样品的荧光光谱是峰值位于503 nm、560 nm、600 nm和655 nm带谱，光激励发光光谱是峰值分别位于500 nm，565 nm和605 nm的宽带谱，光激励激发光谱是峰值位于1 150 nm的宽带谱。     

Eu2+和Pb2+离子在Sr4Si3O8Cl4中发光的研究

本文研究了Sr₄Si₃O₈Cl₄基质的物理化学性质和以Eu^<2+、Ph²⁺离子为激活剂的荧光体的发射光谱、激发光谱、反射光谱及激活剂浓度对发光性能的影响。     

稀土配合物（RE（DBM）3，RE=Nd、Sm、Gd）分子内能量弛豫过程的光声光谱研究

利用光声振幅谱和位相谱对稀土配合物(Nd(DBM)3、 Sm(DBM)3和Gd(DBM)3分子内弛豫过程进行了研究。Sm(DBM)3、 Gd(DBM)3和Nd(DBM)3的配体π-π*跃迁的光声振幅强度依次增强,而Gd、 Sm和Nd的配合物在配体吸收波段内位相依次减小,反映分子内的弛豫过程。对于Gd(DBM)3,配体最低三重态能量不能传递到中心离子4f激发态能级上而直接弛豫回基态;对于Sm(DBM)3和Nd(DBM)3,配体三重态能量有效地传递到中心离子上, Nd3+各能级间隔小且相互重叠,激发态能量几乎全部以无辐射跃迁回基态; Sm3+为荧光离子,激发态上的部分能量以荧光形式发射。由此并结合荧光光谱的结果建立了分子内能量弛豫模型。     

二乙酰对甲苯酒石酸构筑的三个镧系配合物的合成、结构、荧光及光催化性质（英文）

合成并通过红外光谱、元素分析、单晶及粉末衍射表征了3个一维配合物[Ln(HDTTA)_3(CH_3OH)_3]_(n )(Ln=Ce (1),Pr (2),Sm(3))的结构(D-H_2DTTA为(+)-二(对甲苯酰)-D-酒石酸)。单晶衍射结果表明,3个配合物同构,结晶于三方晶系手性空间群R3,在c方向呈现一维链状结构。荧光光谱表明由于D-H_2DTTA配体的激发态能级与Pr~(3+)和Sm~(3+)离子激发态能级接近,所以可以敏化2种离子的f电子在609 nm处的发光。此外,配合物1在紫外光照射下表现出良好的光催化降解染料亚甲基蓝的性质,在无外加试剂条件下160 min内降解率可达76%。     

蓝菌(Westiellopsis prolofica)中C-藻蓝蛋白的光谱学特性及其能量传递过程

本文通过吸收光谱、激发光谱、荧光光谱、荧光激发偏振光谱、荧光偏振光谱和光谱解叠的方法,研究了蓝菌(Westielllopsis prolifica)中C-藻蓝蛋白单体和三聚体的光谱学特性及其发生在其中的能量传递过程。在三聚体中发现了能量逆传递的迹象,并建立了能量双向传递的能级模型,很好地解释了实验所观察到的现象。     

新型长余辉发光材料SrMgSi2O6:Eu2+,Ln3+的制备及性质

采用凝胶-燃烧法合成了系列稀土离子掺杂的Sr0.94MgSi2O6:Eu0.022+,Ln0.043+(Ln=La,Ce,Nd,Sm,Gd,Dy)蓝色长余辉发光材料,用X射线粉末衍射(XRD)、扫描电镜(SEM)、荧光分光光度计等对合成产物进行了分析和表征.结果表明:掺杂了不同稀土离子的SrMgSi2O6:Eu2+,La3+的晶体结构均为网方品系结构;其激发、发射光谱的峰形、峰位基本无变化,激发光谱为一宽带,最大激发峰位于400 nm处,次激发峰佗于415 nm处,发射光谱也为一宽带,最大发射峰位于470 nm附近,是典型的Eu2+的4F5d_4f跃迁导致的,不同之处在于其激发光谱、发射光谱强度及余辉性质有所差别,其中Dy3+是最理想的共掺杂稀土离子,Sr0.94MgSi2O6:Eu0.022+Dy0.043+的余辉时间最长,可达4 h;而Sm3+最差,Sr0.94MgSi2O6:Eu0.022+,Sm0.043+的余辉亮度最低,余辉时间最短.     

痕量双掺Sm~(3 )和Gd~(3 )对Y_2O_2S∶Eu~(3 )发光特性的影响

通过对Y2O2S∶Eu3 红色荧光粉痕量引入Sm3 和Gd3 的研究,发现可有效地增强发光强度,明显改善其电压特性(发射强度与激发电压间的关系特性),且不影响材料的其他物理化学性能。讨论和分析了发射强度增强、电压特性改善的原因:Gd3 对Y3 的置换,减少了因Eu3 对Y3 置换所引起的晶格的畸变、缺陷,使Eu3 离子晶场环境得到改善,从而减弱了无辐射过程及因晶格畸变所造成的能量损失;Sm3 的发射与Eu3 的吸收(激发)的部分重叠,且Eu3 激发光谱中包含有Sm3 激发跃迁谱线,导致了Sm3 →Eu3 共振能量传递可能性,有效地实现Sm3 对Eu3 的敏化效应。     

铜(Ⅱ)离子与神经红蛋白的相互作用

利用紫外可见吸收光谱、荧光光谱、同步荧光光谱及圆二色(CD)光谱研究了铜髤离子与神经红蛋白(NGB)的相互作用。结果表明,Cu2+离子使NGB在280nm处的紫外吸收增强,说明Cu2+与NGB发生了相互作用;Cu2+使NGB内源性荧光发生猝灭,其猝灭机制为静态猝灭;同步荧光光谱表明,Cu2+使色氨酸微环境的疏水性有所降低,Cu2+对NGB的作用位点更接近于色氨酸;CD光谱显示Cu2+没有引起NGB二级结构明显的变化。     

碳笼氧化物的结构和谱学性质

碳笼氧化物对碳笼的官能团化研究具有重要意义,因而激起了人们广泛的研究兴趣。本文对碳笼氧化物C₆₀O_n、C₇₀O_n、C₇₆O_n、C₇₈O_n及C₈₀O_n的结构、电子光谱、红外光谱及核磁共振谱的研究进展进行综合评述。介绍了国内外近十几年来众多研究小组的工作,并结合作者本人在此方面的理论研究成果,进一步探索碳笼氧化物的结构特点以及光谱性质的规律性。在对C₆₀及C₇₀氧化物研究结果与实验符合的基础上,预测高碳笼氧化物的结构和光谱。     

Synthesis and structural studies of complexes of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) with substituted chalcones

Complexes of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) with 3-(2-pyridyl)-1-(2-hydroxy phenyl)-2-propen-1-one (PHPO), 3-(1-naphthyl)-1-(2-hydroxy phenyl)-2-propen-1-one (NHPO) and 3-(3,4-dimethoxy phenyl)-1-(2-hydroxy phenyl)-2-propen-1-one (DMPHPO) have been synthesized and characterized by analytical, conductivity, thermal, magnetic, infrared, electronic and electron spin resonance data. Based on analytical data the stoichiometry of the complexes has been found to be 1 : 2. The conductivity data show that all these complexes are non-electrolytes. The infrared spectral data indicate that the ligand PHPO acts as uninegative tridentately towards Co(II) and Ni(II) and bidentately with Cu(II), Zn(II) and Cd(II). Ligands like NHPO and DMPHPO act as uninegative bidentately with all the metal ions. The electronic spectral data suggest that all the Co(II) complexes and Ni(II) of PHPO complex are octahedral and all the Cu(II) and Ni(II) of NHPO and DMPHPO complex are square-planar. The complex of Zn(II) and Cd(II) are tetrahedral. ESR parameters of Cu(II) complexes have been calculated and relevant conclusions have been drawn with respect to the nature of bonds present in them.     

Chlorofluorieren mit Trifluormethylhypochlorit CF3OCl. Darstellung und spektroskopische Charakterisierung von Trifluormethyliodchloridfluorid CF3I(Cl)F

Chlorofluorinate with Trifluoromethylhypochlorite CF₃OCl. Preparation and Spectroscopic Characterization of Trifluormethyliodinechloridefluoride CF₃I(Cl)F The preparation of a new iodine(III) compound, trifluormethyliodinechloridefluoride CF₃I(Cl)F, via oxidative addition of trifluoromethylhypochlorite CF₃OCl to trifluoromethyliodide CF₃I is described. The thermolabile compound has been characterized by i.r., Raman, ¹⁹F NMR, and mass spectroscopy.     

5,10,15,20-四(对氯苯基)卟啉羟基稀土配合物的光谱研究

研究了四(对氯苯基)卟啉及其羟基稀土配合物的紫外-可见光谱、红外光谱和拉曼光谱,对主要谱带进行了经验归属,讨论了中心离子对紫外光谱和共振拉曼光谱结构敏感带频率的影响.     

Derivate von Tricyanmethan. 2. Untersuchungen über Methyltricyanmethan (1,1,1-Tricyanethan) [1]

Derivatives of Tricyanomethane. 2. Studies on Methyl Tricyanomethane (1,1,1-Tricyanoethane) The title compound H₃C? C(CN)₃ has been characterized by means of nuclear magnetic resonance, vibrational, and mass spectra.     

Diffuse reflection FTIR spectral database of dyes and pigments

24 pigments commonly used in art have been characterized by diffuse reflection infrared spectroscopy (DR). All of the compounds have also been characterized by means of infrared absorption spectroscopy to demonstrate the reliability of the DR technique. This is the first record of the use of this technique as an analytical tool in conservation science, and the results appear to be promising for the identification of unknown pigments used on historical and artwork artifacts. Although the DR technique used here is not nondestructive, it can still be usefully applied to the analysis of artwork since it requires only a very small quantity of sample for analysis.     

The role of TiO2 in the B2O3–Na2O–PbO–Al2O3 glass system

Optical and vibrational studies have been carried out on 60B₂O₃·(20−x)Na₂O·10PbO·10Al₂O₃:xTiO₂ (x=0, 1, 2, 3, 4, and 5 mol%) glasses, in order to understand the role of TiO₂ in the 60B₂O₃·20Na₂O·10PbO·10Al₂O₃ glass matrix. The X-ray patterns reveal homogeneous glasses over the entire compositional range. The absorption spectra show that the energy of the optical band gap (ΔE_opt) and Urbach's energy (E_U) decreases as TiO₂ content increases. The changes observed in the Raman and IR spectra are related to the BO₄→BO₃ back conversion effect and the appearance of “loose” BO₄⁻ groups. The data indicate that titanium ions act as a network modifier.     

Dinitramide and its salts

The vibrational and electronic spectra of dinitramide salts MN(NO₂)₂ (M=K, Na, Li, NH₄, Fe, Ag, Mn, Mg, Rb, C(NH₂)₃) have been studied. The IR and Raman spectra of solutions and melts of the salts have been satisfactorily interpreted on the basis of the anion model withC _2v symmetry. The complication of the spectra in the crystalline phase has been explained by restructurization of the anion that reduces its symmetry and makes the nitro groups nonequivalent.For part 6, seeIzv. Akad. Nauk, Ser. Khim., 1995, 113 [Russ. Chem. Bull.,44, 108 (Engl. Transl.)].Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1508–1512, August, 1995.     

Preparation and investigation of the crystals formed in the buckminsterfullerene-tetraselenotetracene-carbon disulfide system

Crystals containing up to 30 wt. % CS₂, according to the data of IR and X-ray photoelectron spectroscopy, were isolated from the C₆₀-TSeT-CS₂ (TSeT is tetraselenotetracene) system. The unusually high concentration of carbon disulfide results in the complete sublimation of the crystals at a relatively high temperature (520 °C). The electron energy loss spectra of the crystals obtained were measured and analyzed.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 845–848, May, 1995.This work was financially supported by the Russian Foundation for Basic Research (Projects No. 93-03-18002, 93-03-18705, and 93-03-5650).