Enhancement of B(E2) Collectivity in the sdg-Interacting Boson Model

It is pointed out that the difficulty in boson models in explaining the large B(E2) experimental data is not due to the lack of collectivity in boson model wavefunction. This long standing problem of reduction in collectivity of wavefunction in boson models can be solved by choosing an appropriate E2 transition operator in the SU(3) limit of the sdg-interacting boson model. The ratio B(E2, L + 2 → L)/B(E2,2 → 0) can be almost any large number.     

酸性水溶液中硫氰酸钼（V）配合物的研究

研究了酸性水溶液中硫氰酸钼配合物(Ⅴ)的吸收光谱,发现在460nm处有最大吸收,最大平均摩尔吸光系数为1.02×10~4。用平衡移动法确定其生成机理为一种三级分级配合反应,并用法确定了各级配合物的稳定常数分别为β_1=15.63,β_2=174.4和β_3=1502,相应的摩尔吸光系数是△ε_1=8957,△ε_2=9347和△ε_3=10610。     

2-三氟甲基吡啶的合成与光谱表征

以2-氯基吡啶为原料,合成2-溴吡啶(收率68%)和2-碘吡啶(收率56%);2-溴吡啶和2-碘吡啶与三氟乙酸钾反应,得2-三氟甲基吡啶(收率56%-72%).通过NMR和元素分析对产物的结构进行了表征.该合成路线的优点是原料易得,反应条件温和,收率较高,总收率为38%-42%.     

稀土配合物RE(TPTZ)Cl3的合成、表征及荧光性能研究

首次以2,4,6-三吡啶基三嗪（TPTZ）与Sm, Eu, Tb和Dy氯化物反应,合成四种单一稀土配合物以及Tb分别1∶1掺Gd, Y, La的三种异核配合物。经元素分析、稀土络合滴定、摩尔电导率、红外光谱、紫外光谱和差热-热重测定表明,配合物的组成分别为RE（TPTZ）Cl3·3H2O（RE=Sm, Eu, Tb, Dy）和Tb0.5Ln0.5（TPTZ）Cl3·3H2O（Ln=Gd, Y, La）;TPTZ作为三齿配体与稀土离子配位,即中心环提供一个N原子,两个吡啶环分别提供一个N原子;配合物中3个水分子与稀土离子配位,1个Cl-在外界,2个在内界,为1∶1型电解质;配合物内外界可能为[RE（TPTZ）（H2O）3Cl2] Cl,稀土离子的配位数为8。配合物的荧光光谱测试表明,四种单一稀土配合物中,Tb配合物发光最强;三种1∶1掺杂异核Tb配合物荧光强度大于纯Tb配合物,表明Y3＋, La3＋和Gd3＋都可以敏化Tb3＋的发光,其中Gd3＋的敏化作用最强,Y3＋次之,La3＋最差。     

Effects of an odd particle on shape phase transitions in odd-even systems

A scheme to solve the Hamiltonian in the interacting boson-fermion model in terms of the SU(3) coupling basis is introduced,through which the effects of an odd particle on shape phase transitions(SPTs) in odd-A nuclei are examined by comparing the critical behaviors of some selected quantities in odd-even and even-even systems.The results indicate that the spherical to prolate(U(5)-SU(3)) SPT and spherical to γ-soft(U(5)-O(6)) SPT may clearly occur in the odd-even system with the SPT signatures revealed by various quantities including the excitation energies,energy ratio,B(E2) ratio,quadrupole moments,and one-particle-transfer spectroscopic intensities.In particular,the results indicate that the spherical to prolate SPT in the odd-even system can even be strengthened by the effects of the odd particle with the large fluctuations of the quadrupole deformations appearing near the critical point.     

Synthesis, Characterization, Antioxidant Activity and DNA-Binding Studies of Three Rare Earth (III) Complexes with 1-(4-Aminoantipyrine)-3-tosylurea Ligand

1-(4-Aminoantipyrine)-3-tosylurea (H₂L) and its three lanthanide (III) complexes, M(H₂L)₃ 3NO₃ [where M = Nd(III), Sm(III) and Eu(III)], have been synthesized and characterized. In addition, the DNA-binding properties of the three complexes have been investigated by UV–vis (ultraviolet and visible) absorption spectroscopy, fluorescence spectroscopy, circular dichroism (CD) spectroscopy, cyclic voltammetry, and viscosity measurements. Results suggest that the three complexes bind to DNA via a groove binding mode. Furthermore, the antioxidant activity (superoxide and hydroxyl radical) of the metal complexes was determined by using spectrophotometer methods in vitro. These complexes were found to possess potent antioxidant activity and be better than standard antioxidants like vitamin C and mannitol. Absorption spectra of the complex 3 inTris-HCl buffer upon addition of calf-thymus DNA. [complex]=1×10^-5 M, [DNA]=(0-1) ×10^-5 M. Arrow shows the absorbance changing upon increasing DNA concentrations. Inset: plots of [DNA]/(ε_a – ε_f) versus [DNA] for the titration of DNA with the complex.     

2-(4-氟代苯甲酰基)苯甲酸-铕配合物的合成、结构表征及荧光性能的研究

以硝酸铕、2-(4-氟代苯甲酰基)苯甲酸(HL)、1,10-菲咯啉(Phen)和三苯基氧膦(TPPO)合成了EuL₃(H₂O)₆,EuL₃Phen(H₂O)₄和EuL₃(TPPO)(H₂O)₅三种固态配合物。用元素分析、红外光谱、核磁共振氢谱对配合物进行了组分确定和结构表征。IR表明,2-(4-氟代苯甲酰基)苯甲酸与Eu3+形成配合物后,位于1 692 cm-1处羧基的ν_CO峰消失,2 500～3 200 cm-1处羧基的ν_O—H峰也消失,出现了羧酸盐特有的反对称伸缩振动吸收峰(ν_as(CO-₂))和对称伸缩振动吸收峰(ν_s(CO-₂)),且Δν(ν_as(CO-₂)-ν_s(CO-₂))与钠盐的Δν相近,说明羧酸根与Eu3+以对称双齿桥式配位。在1H NMR中,形成配合物后第一配体苯环上的质子峰变为宽峰且移向高场,Phen和TPPO中质子化学位移移向低场。室温下测定了配合物的荧光激发光谱和发射光谱,激发光谱表明配合物EuL₃(H₂O)₆,EuL₃Phen(H₂O)₄和EuL₃(TPPO)(H₂O)₅的最佳激发波长分别为353.0,355.0和357.0 nm;发射光谱均显示Eu3+离子的特征发射光谱,且表明Phen对Eu3+离子的荧光发射有明显增强作用。     

卤代苯甲酸-TPTZ铽配合物的合成、表征及荧光性能

分别以对溴苯甲酸和对碘苯甲酸为第一配体,2,4,6.三吡啶基三嗪(TPTZ)为第二配体,以铽为中心,La3+、Y3+、Cd3+为掺杂离子,合成了8种铽及其掺杂配合物,对其进行了C、H、N元素分析及稀土络合滴定、紫外光谱、红外光谱和荧光光谱测定.推测配合物的组成为:Tb(P-BrBA)3(TPTZ)·2H2O和Tb(P-...     

4-[(E)-2-(3, 4-二甲氧基苯基)乙烯基]苯氧基乙酸乙酯的合成及其NMR研究

以对硝基甲苯、3, 4-二甲氧基苯甲醛为起始原料,经过缩合,还原,重氮化水解,亲核取代反应,最终合成了新的化合物4-[(E)-2-(3, 4-二甲氧基苯基)乙烯基]苯氧基乙酸乙酯,用¹H 和¹³C NMR及多种二维核磁共振谱确定了该化合物的结构,完成了¹H 和¹³C NMR的归属,给出了分子中各氢,碳原子的准确化学位移.     

带三体势的IBM1的O(6)极限对偶偶Pt核的应用

通过在IBMI哈密顿中,引入一种简单的等效三体势,O(6)核能谱可得到不同程度的修正.本文具体计算了^192—198Pt偶偶同位素核的能谱和E2跃迁几率,理论计算值与实验数据符合较好.     

对二甲氨基苯甲醛双缩二氨基硫脲双酰腙的合成、表征及与Zn2+的荧光反应

合成了对二甲氨基苯甲醛双缩二氨基硫脲,通过元素分析、红外光谱、紫外可见吸收光谱等对配体进行了表征,并对其荧光性质及Zn2 离子对其荧光性质的影响进行了研究.     

SU（2）相干态场与二能级原子的非简并双光子相互作用

研究了双模ＳＵ（２）相干态场与腔中二能级原子的非简并双光子相互作用。用数值计算讨论了ＳＵ（２）光场的反关联特性对原子动力学行的影响及场的量子统计性质时间的演化。     

利用原子-腔场的拉曼相互作用制备双模SU(2)薛定谔猫态

利用一个参量频率转换过程,在腔中制备双模ＳＵ（２）相干态,然后注入一个与腔场的一个个模发生拉曼相互作用的Ａ型三能级原子,通过原子－腔场相互作用生成腔场－原子纠缠,通过对原子进行选择性测量,腔场－原子纠缠态将塌缩到纯态,即双模ＳＵ（２）薛定谔猫态。     

Spectroscopic Studies of Oxygen-Bridged Copper (II) Cluster Complexes; (I) Dimeric Copper (II) Complexes of 2-Aminopyridine and Pentane-2,4-Dionate

X-band E.P.R and also the far infrared spectra of alkoxy-bridged dimeric copper (11) complexes of 2-aminopyridime and pentane-2, 4-dionate were recorded and the two sets of data thus obtained have been correlated.

The E.P.R spectra were analysed in terms of an axial (S=1) spin Hamiltonian. Zero-field splitting parameter (D) was calculated for each complex and an attempt was made in order to correlate the obtained values with the magnetic coupling constants (J) of some compounds with analogous structures.

An assignment has been made of the bands related to the central Cu202 bridging skeleton and the observed similarity in the frequency magnitude of a strongly CuOCu angle dependent mode has been proposed to arise from nearly equal angles in the seri of complexes.

The correlative results indicated in the above have therefore enabled the identification of a ferromagnetic exchange mechanism in the seri of complexes with J values larger than 242.5 cm-1.     

2,4,6-三吡啶基三嗪-芳香羧酸镝配合物的合成及其荧光性能

分别以2,4,6-三吡啶基三嗪( TPTZ)、对羟基苯甲酸和对苯二甲酸为配体,以Dy3+为中心合成了不同组成的5种配合物.对其进行了元素分析、紫外光谱、红外光谱、荧光激发和发射光谱的测定.推测配合物的组成分别为:(1)Dy(TPTZ)(NO3)3(C2H5OH)·H2O; (2) Dy (TPTZ)2 (NO3)3 (...     

Preparation,Chemical Characterization and Electronic Spectra of 6-(2-Pyridylazo)-3-Acetamidophenol and Its Metal Complexes

The stereochemistry of new iron (III), cobalt (II), nickel (II), copper (II), zinc (II) and cadmium (II) complexes of 6-(2-pyridylazo)-3-acetamidophenol (H2L) was studied on the basis of their analytical, spectroscopic, magnetic and conductance data. the dissociation constant of the ligand, as well as the stability constants of its metal complexes had been determined by spectrophotometric method. on the basis of infrared spectra, the coordination behaviour of the ligand to the metal ions was investigated. Magnetic susceptibility and solid reflectance spectra measurements were used to infer the structure. the isolated complexes were found to have the general formulae [M (HL). xH₂O] (A).yH₂O, M = Cu (II), Zn (II), Cd (II) and Fe (HI); HL = 6-(2-pyridylazo)-3-acetamido-phenol; a = acetate in the case of Cu (II) and Zn (II) or chloride in the case of Cd (II) and Fe (Ill), x = 1-3 and y=0-5. for [M (H₂L).xH₂O]Cl₂.yH₂O, M = Ni (II) and Co (II); HL = 6-(2-pyridyl-azo)-3-acetamidophenol, x=3 and y=5-6).     

Eu3+掺杂的α-Gd2(MoO4)3荧光粉合成与表征

采用固相反应法合成了Eu³⁺掺杂的α-Gd₂(MoO₄)₃荧光粉。通过XRD、SEM以及激发和发射光谱对样品进行了研究,结果发现助熔剂为3%时样品的结晶较好,样品的发光强度最强,并且样品粉末不团聚。光谱测量的结果表明该荧光粉与其他商品荧光粉不同,其最有效的激发波长不在电荷迁移带范围,其f-f跃迁的465,395nm吸收更强,这就意味着该类荧光粉可作为目前已商品化的白光LED的红色补偿荧光粉,也可作为近紫外LED和三基色荧光粉组合型白光器件的红色荧光粉的候选材料。     

N2（A）及N（2D）对IF（X）的传能研究

在微波放电系统中,对NH_3-F-F_2-CF_3I体系进行研究,结果表明,向IF(X)传能的诸多媒介中,N_2(A)及N(~2D)起着主要作用,并且这一结论在经微波激发后的N_2与CF_3I的直接反应中得到了进一步证实。     

Characterization of Ir(ppy)3 and [Ir(ppy)2 bpy]+ by infrared,Raman spectra and surface‐enhanced Raman scattering

The Raman and infrared spectra of fac ‐tris(2‐phenylpyridinato‐N,C2′)iridium(III), Ir(ppy)₃ and surface‐enhanced resonance Raman spectra of bis(2‐phenyl pyridinato‐) (2,2′bipyridine) iridium (III), [Ir(ppy)₂ (bpy)]⁺ cation were recorded in the wavenumber range 150–1700 cm⁻¹, and complete vibrational analyses of Ir(ppy)₃ and [Ir(ppy)₂ (bpy)]⁺ were performed. Most of the vibrational wavenumbers were calculated with density‐functional theory agree with experimental data. On the basis of the results of calculation and comparison of the spectra of both complexes and their analogue [Ru(bpy)₃]²⁺, we assign the vibrational wavenumbers for metal–ligand modes; metal–ligand stretching wavenumbers are 277/307 and 261/236 cm⁻¹ for Ir(ppy)₃, and 311/324, 257/270, 199/245 cm⁻¹ for [Ir(ppy)₂ bpy]⁺. Surface‐enhanced Raman scattering spectra of [Ir(ppy)₂ bpy]²⁺ were measured at two wavelengths on the red and blue edges of the low‐energy metal‐to‐ligand charge‐transfer band. According to the enhanced Raman intensities for the vibrational modes of both ligands ppy and bpy, the unresolved charge‐transfer band is deduced to consist of charge‐transfer transitions from the triplet metal to both ligands ppy and bpy. Copyright © 2010 John Wiley & Sons, Ltd.