Phase diagrams of the ternary liquid systems [Ce(NO3)3(TBP)3]-C10H22-[UO2(NO3)2(TBP)2] and [Ce(NO3)3(TBP)3]-C10H22-[Th(NO3)4(TBP)2] and of the quaternary liquid system [Ce(NO3)3(TBP)3]-C10H22-[UO2(NO3)2(TBP)2]-[Th(NO3)4(TBP)2]

The phase diagrams of the ternary liquid systems [Ce(NO₃)₃(TBP)₃]-C₁₀H₂₂-[UO₂(NO₃)₂(TBP)₂] and [Ce(NO₃)₃(TBP)₃]-C₁₀H₂₂-[Th(NO₃)₄(TBP)₂] and of the quaternary liquid system [Ce(NO₃)₃(TBP)₃]-C₁₀H₂₂-[UO₂(NO₃)₂(TBP)₂]-[Th(NO₃)₄(TBP)₂] at T = 298.15 K are constructed. The phase diagrams are characterized by areas of homogeneous solutions and of two-phase liquid systems (systems with phase separation), with one phase (I) enriched in [Ce(NO₃)₃(TBP)₃], [Th(NO₃)₄(TBP)₂], and [UO₂(NO₃)₂(TBP)₂], and the other phase (II), in C₁₀H₂₂. Using the data on the mutual solubility of the components in the systems under consideration and equations of the NRTL model, the parameters of intermolecular interactions and the excess Gibbs energies (G ^ex) were calculated for the binary, ternary, and quaternary systems. Passing from the ternary system [Ce(NO₃)₃(TBP)₃]-C₁₀H₂₂-[Th(NO₃)₄(TBP)₂] to the quaternary system [Ce(NO₃)₃(TBP)₃]-C₁₀H₂₂-[UO₂(NO₃)₂ (TBP)₂]-[Th(NO₃)₄(TBP)₂] does not appreciably affect the distribution of C₁₀H₂₂ between phases I and II, but leads to the redistribution of [Ce(NO₃)₃(TBP)₃] into phase II and of [Th(NO₃)₄(TBP)₂] into phase I.     

Physicochemcial analysis of the phase diagram of the ternary liquid system [Y(NO3)3(TBP)3]-tetradecane-[UO2(NO3)2(TBP)2]

The phase diagram of the ternary liquid system (TLS) [Y(NO₃)₃(TBP)₃]-tetradecane-[UO₂ · (NO₃)₂(TBP)₂] (TBP is tri-n-butyl phosphate) at 298.15 K is constructed. The TLS is characterized by an area of homogeneous solutions and an area of two-phase liquid systems with one of the phases (I) enriched in [Y(NO₃)₃(TBP)₃] and [UO₂(NO₃)₂(TBP)₂] and the other phase (II), in tetradecane. The inter-molecular interaction parameters and excess Gibbs energies (g ^E ) for the binary systems and TLS along the binodal curve were calculated from data on the mutual solubility in the binary system [Y(NO₃)₃(TBP)₃]-tetradecane and the ternary liquid system, using equations of the NRTL theory. For the binary system [Y(NO₃)₃(TBP)₃]-[UO₂(NO₃)₂(TBP)₂], g ^E < 0, and for the other binary systems, g ^E > 0. An algorithm is given for computer calculation of the binodal curve and nodes for the TLS within the framework of NRTL equations using the intermolecular interaction parameters.     

{[Cd(Ⅱ)L(NCS)2](DMF)2}n(L=1,4-二[2-(2-吡啶基)苯并咪唑基]丁烷)的合成,晶体结构与荧光光谱研究

合成了一种新的包含咪唑基团的双端四齿鳌合配体1,4-二[2-(2-吡啶基)苯并咪唑基]丁烷,并用其作为桥联配体与金属离子共同构筑配位聚合物.用Cd2 金属离子和L在DMF/H2O混合溶液中,存在KSCN的条件下,合成一种新型的一维链状配位聚合物{[Cd(Ⅱ)L(NCS)2](DMF)2}n(L=1,4-二[2-(2-吡啶基)苯并咪唑基]丁烷).单晶X-射线分析仪分析表明,该晶体属三斜晶系,P-1空间群,晶胞参数为:a=8.869(1)A,b=11.278(2)A,c=19.328(4)A,α=89.83(3)°,β=89.52(3)°,γ=74.28(3)°,V=1860.9(7)(A)3,Z=2,7250个独立衍射点中,6039个可观测点满足F2≥2σ(F2o),R=0.0543,wR2=0.1442.它是由一维的锯齿形链[Cd(Ⅱ)L(NCS)2]n和游离的DMF分子组成.在链内金属原子与来自于2个具有不同结构的配体L中的4个N原子和2个SCN-阴离子中的2个N原子形成八面体配位.该固态配合物在室温下用389nm的紫外光激发时在453nm处发射出强的荧光.     

Structural and magnetodielectric properties of poly(vinylidene-fluoride)-[0.8(Bi0.5Na0.5)TiO3-0.2CoFe2O4] polymer composite films

Composite thick films of xPoly(vinylidene-fluoride)-(1−x)[0.8(Bi_0.5Na_0.5)TiO₃-0.2CoFe₂O₄] with x = 0.1, 0.2, 0.3 and 0.4 were synthesized by hot press method. X-ray diffraction pattern of the composite films indicate the existence of distinct peaks of poly(vinylidene-fluoride), (Bi_0.5Na_0.5)TiO₃ and CoFe₂O₄ phases. The value of dielectric loss and saturation magnetization of polymer composite films decrease with increase in poly(vinylidene-fluoride) content. The magnetodielectric effect of the polymer composite films was found to improve with increasing poly(vinylidene-fluoride) content. The linear fitting of Δε ∼ γM² gives the value of magnetoelectric interaction coefficient (γ) of polymer composite films.     

Crystal structures, thermal decompositions and sensitivity properties of [Cu(ethylenediamine)2(nitroformate)2] and [Cd(ethylenediamine)3](nitroformate)2

Two new coordination compounds [Cu(ethylenediamine)(2)(nitroformate)(2)] and [Cd(ethylenediamine)(3)](nitroformate)(2) were synthesized and characterized through elemental analysis, IR and UV spectra. Their crystal structures were determined through X-ray single crystal diffraction. The first compound crystallizes in the triclinic space group P1; the second one crystallizes in the orthorhombic space group Pbca. For the first compound, central Cu(II) ion is hexa-coordinated with two ethylenediamine ligand molecules and two nitroformate anions to form the centrosymmetric octahedral structure. For the second one, central Cd(II) ion is hexa-coordinated with three ethylenediamine ligand molecules to form the slightly distorted octahedra. Through hydrogen bonds, molecules are linked together to form the three-dimensional packing diagrams. Thermal decomposition mechanisms of these two compounds were predicted through DSC, TG-DTG and FTIR analyses. In addition, the impact sensitivity, friction sensitivity and flame sensitivity were measured. All observed properties show that the first one has high energy, good thermal stability and moderate flame sensitivity.     

Synthesis and blue electroluminescent properties of zinc (II) [2-(2-hydroxyphenyl)benzoxazole]

This study reports on the properties of organic light-emitting diodes (OLEDs) with zinc (II) [2-(2-hydroxyphenyl)benzoxazole] as a hole-blocking layer. OLEDs devices are prepared in a conventional OLEDs structure (i.e., anode/HTL/EL/HBL/cathode and anode/HTL/HBL/EL/cathode). The luminescence efficiencies and the turn-on voltage are significantly affected by the existence of the hole-blocking layer. This is attributed to an excellent hole-blocking property, which is in turn due to the high HOMO energy level (6.5 eV). The device showed luminous efficiency 2.46 lm/W at 5 V. The maximum luminance of about 10,000 cd/m² is obtained, and the turn-on voltage (2.5 V) is affected by the existence of the hole-blocking layer.     

Tetramethylammonium Neptunium(IV) Isothiocyanate [N(CH3)4]4[Np(NCS)8]

A new Np(IV) complex, [N(CH₃)₄]₄[Np(NCS)₈], was prepared. Its crystal structure was determined, and the absorption spectra in the IR and near IR ranges were measured. Crystal data: a = 27.280(6), b = 12.288(3), c = 13.493(3) Å, space group Pna2₁, Z = 4, V = 4523(2) A³, R = 0.044, wR(F ²) = 0.091. The crystal structure of the compound consists of [Np(NCS)₈]^{4 -} anions and N(CH₃)₄ ⁺ cations. The coordination polyhedron of the Np atom is a distorted tetragonal antiprism formed by the nitrogen atoms of eight NCS^- ions.     

Crystal Structure of Rb[UO2(SO4)F]

Single crystal of Rb[UO₂(SO₄)F] (I) was studied by X-ray diffraction [rhombic system, space group Pca2 ₁, Z = 12, unit cell parameters: a = 25.393(3), b = 6.735(1), c = 11.496(3) Å]. The main structural units of crystals of I are [UO₂(SO₄)F]^- layers belonging to the crystallochemical group AT³M² (A = UO₂ ^{2 +}) of uranyl complexes and combined into three-dimensional framework by electrostatic interactions involving interlayer rubidium ions.     

Crystal structure of Rb3[UO2(CH3COO)3]2[UO2(CH3COO)(NCS)2(H2O)]

The structure of Rb₃[UO₂(CH₃COO)₃]₂[UO₂(CH₃COO)(NCS)₂(H₂O)] was studied by single crystal X-ray diffraction. The compound crystallizes in the monoclinic system with the unit cell parameters (at 100 K) a = 18.387(3), b = 16.398(3), c = 12.460(2) Å, β = 92.837(5)^°, V = 3752.4(11) ų, space group C2/c, Z = 4, R = 0.0390. The uranium-containing structural units of the crystals are isolated mononuclear groups [UO₂(CH₃COO)₃]^? and [UO₂(CH₃COO)(NCS)₂(H₂O)]^?, belonging to crystal-chemical groups AB ₃ ⁰¹ and AB⁰¹M ₃ ¹ (A = UO ₂ ²⁺ , B⁰¹ = CH₃COO^?, M¹ = NCS^? and H₂O) of uranyl complexes, respectively. The uranium-containing complexes are linked in a framework by hydrogen bonds and by electrostatic interactions with Rb⁺ cations.     

Structural analysis of 2-(2-thienyl)-1-(2-pyrazinyl)ethene [C10H8N2S] and 2-(2-thienyl)-1-(2-quinoxalinyl)ethene [C14H10N2S]

The crystal structures of the 2-(2-thienyl)-1-(2-pyrazinyl)ethene (TPE) and 2-(2-thienyl)-1-(2-quinoxalinyl)ethene (TQE) have been studied by single crystal x-ray diffraction. Both the structures exhibit whole molecule disorder and each structure consists of two conformers, related to each other by approximate two fold rotation of one of the heterocyclic units, about a plane defined by the pi unit linking the electron rich (sulfur) heterocycle to the electron poor (nitrogen) heterocycle. TPE and TQE crystalize in the centrosymmetric space groups Pbca and C2/c respectively, consequently they will not be suitable candidates for second order NLO activity in the condensed phase.     

Vibrating reed study of the flux line dynamics of κ-(ET)2Cu[N(CN)2]Br

Vibrating reed measurements were performed on single-crystal samples ofκ-(ET)₂- Cu[N(CN)₂]Br in an applied magnetic fieldH oriented either parallel (“longitudinal”) or perpendicular (“transverse”) to the highly conducting ac-plane. Field-cooling data taken for the longitudinal orientation andH<0.7 T revealed a peak with a low-temperature shoulder in the reed dissipation 1/Q located at temperatureT _Q below the superconducting transition temperatureT _c (≈11.6 forH=0). The shoulder disappeared nearH≈0.7 T, accompanied by an abrupt change in the slope ofT _Q (H), corresponding to a similar change in the slope of the upper critical magnetic fieldH _c2 measured by Kwoket al. The existence of the shoulder in the dissipation peak bears on a number of current explanations for the exotic superconducting properties ofκ-(ET)₂Cu[N(CN)₂]Br.T _Q data taken for the transverse orientation fell far below estimates ofH _c2., indicating the existence of a substantial region of flux line (FL) mobility belowH _c2(T). The location of a peak in NMR relaxation observed by De Sotoet al. lies close toT _Q for the transverse orientation.     

纳米微孔杂多化合物Na[Fe2(O2H3)Mo2O8](Ⅰ)和(NH4)[Fe(MoO4)2](Ⅱ)的结构特征

通过采用水热合成法得到了二种具有纳米筛孔的氧簇化合物Na[Fe2(O2H3)Mo2O8](Ⅰ)和(NH4)[Fe(Mo O4)2](Ⅱ).晶体(Ⅰ)属于单斜晶系,空间群为C2/m,晶胞参数为:a=9.5450(17),b=6.4381(9),c=0.76405(12)nm;β=116.128(4),Z=2,R1=0.0219,Rw=0.0756.晶体(Ⅱ)属于正交晶系,空间群为Pnma,晶胞参数为:a=1.4782(3),b=0.56774(11),c=0.87653(18)nm;Z=4,R1=0.0212,Rw=0.0513.     

First Order Transition in the Organic Superconductor κ-(BEDT-TTF)_2Cu[N(CN)2]Br

Magnetoresistance for field close to the parallel to the superconducting planes direction has been studied in organic superconductor κ-(BEDT-TTF)₂Cu[N(CN)₂]Br. The results show a first order phase transition between the superconducting state and the normal state at the upper critical field H_c2. The 1 ^st order transition is evidenced by the hysteretic behavior in the magnetoresistance as a function of field or angle between the field and the plane. A possible model is discussed.     

SQUID-Magnetometry Study of the P-T Phase Diagram of κ-[(BEDT-TTF)1−x(BEDSe-TTF)x]2Cu[N(CN)2]Br

Static susceptibility of κ-[(BEDT-TTF)_1−x(BEDSe-TTF)_x]₂Cu[N(CN)₂]Br alloys with the BEDSe-TTF content near the border-line of ambient pressure superconductivity (x~0.3) has been measured as a function of temperature, magnetic field, and pressure. The results are discussed in comparison with the data on a family of κ-(BEDT-TTF)₂Cu[N(CN)₂]Cl_1−xBr_x.     

Effect of high pressure on the dielectric properties of relaxor compositions [Pb(Fe1/2Nb1/2)O3]1-x-y-[Pb(Zn1/3Nb2/3)O3]x- [BaTiO3]y

Abstracts are not published in this journal     

Ambient pressure superconductivity in κ-(BEDT-TTF)2Cu[N(CN)2]Cl single crystals

Single crystals of the κ-(BEDT-TTF)₂Cu[N(CN)₂]Cl radical cation salt possessing metallic properties and showing a superconducting transition with T_c=11.5 K at ambient pressure were first prepared.