Measurements of Reaction Cross Section for F Isotopes and Possible Proton Skin Structure for 17F

The reaction cross sections σ R of F isotopes on carbon target were measured at intermediate energies via the transmission method. It was found that the reaction cross section of ¹⁷F has a little enhancement compared with that of its neighbor isotopes. The difference factor d has been deduced from the measured σ R by using the BUU model and Glauber model. It is enhanced also for ¹⁷F compared with its neighbor isotopes. From the above analysis, a possible proton skin structure is suggested for ¹⁷F.     

3{1-[2-(-3-羟基-1-甲基-2-亚丁烯氨基)-苯亚氨基]-乙基}4-甲硫基-2,4-戊二烯-2-醇的不对称Schiff碱镍(Ⅱ)配合物的合成、结构和性质

由5-(2-乙酰基-1-甲硫基-3-羰基-亚丁基)-丙二酸亚异丙酯(1)与邻苯二胺及乙酸镍()经一步反应合成了3{1-[2-(-3-羟基-1-甲基-2-亚丁烯氨基)-苯亚氨基]-乙基}4-甲硫基-2,4-戊二烯-2-醇(3)的不对称四齿Schiff碱镍(Ⅱ)配合物(2),X射线衍射结果表明,配合物2属单斜晶系,P2₁/C空间群.a=1.1476(2)nm,b=1.1782(2)nm,c=1.4810(3)nm;β=111.73(2)°,V=1.8602(7)nm³,Z=4,Rf=0.0535.电化学(循环伏安)测定结果表明,该配合物在测定条件下(阳极峰电位为1.1V)发生了不可逆的氧化-还原反应.     

对苯二甲酸镁作为钠离子电池的有机负极材料

报道了对苯二甲酸镁作为钠离子电池负极材料的研究. 以对苯二甲酸和氢氧化镁为原料,采用酸碱中和反应制备了含结晶水的对苯二甲酸镁（MgC₈H₄O₄·2H₂O）,该材料对钠离子电池表现出了较好的电化学活性、优异的倍率性能以及良好的循环稳定性. 在0.5C（1C=300 mA·g^-1）倍率下循环50 周以后,可逆容量由114mAh·g^-1降至95 mAh·g^-1,容量保持率高达83%;在2C的倍率下有高达90 mAh·g^-1的可逆比容量. 另外,在氮气气氛中,400 ℃进行后续热处理得到了不含结晶水的对苯二甲酸镁（MgC₈H₄O₄）,探讨了结晶水对其电化学性能的影响. 结果表明,MgC₈H₄O₄·2H₂O的比容量、倍率性能以及循环稳定性都明显优于不含结晶水的对苯二甲酸镁.     

铜(Ⅱ)与取代酞酰苯胺酸和β-苯丙氨酸混配配合物的研究

酞酰苯胺酸具有突出的生理活性犤１,２犦,其活性随过渡金属配合物生成而增强犤３,４犦,某些氨基酸是人体蛋白质的结构单元,本文报道了铜?与取代酞酰苯胺酸、苯丙氨酸混配配合物的合成、表征及热分解机理。１实验部分１．１配合物的合成酞酰苯胺酸配体的合成按文献犤５犦进行。酞酰苯胺酸与氢氧化钠按１∶１摩尔比溶于热乙醇,苯丙氨酸与氢氧化钠按１∶１摩尔比溶于蒸馏水,分别得到酞酰苯胺酸和苯丙氨酸的钠盐溶液。合并二配体钠盐溶液并置于５０～６０℃水浴中搅拌,按金属盐与每种配体酸１∶１摩尔比缓慢滴入CuAc２水溶液,即有大量…     

用高分子保护的纳米MgO的合成

本文利用高分子表面保护的化学沉淀方法成功地制备了粒径分布均匀的类球型纳米MgO。并对所制得的纳米粒子采用红外光谱（IR）、透射电镜（TEM）、差热及热重分析（TG－DTA）和X射线衍射（XRD）等现代分析测试手段进行了表面形貌、结构、晶形和组成等的表征。结果表明利用高分子的表面保护作用能够控制纳米微粒的形状和大小;由于聚乙烯醇分子中多羟基与金属离子间强的相互作用,因此获得的纳米微粒径更小,分散性更好。     

Structural diversity,magnetic properties and luminescence of NiII,CoII and ZnII coordination polymers derived from 3,3′‐[(5‐carboxy‐1,3‐phenylene)bis(oxy)]dibenzoic acid and 1,10‐phenanthroline

Three novel coordination polymers (CPs), namely poly[[di‐μ‐aqua‐bis{μ₄‐3,3′‐[(5‐carboxylato‐1,3‐phenylene)bis(oxy)]dibenzoato‐κ⁵O¹:O^1′,O³:O⁵:O^5′}bis(1,10‐phenanthroline‐κ²N,N′)trinickel(II)] dimethylformamide 1.5‐solvate trihydrate], {[Ni₃(C₂₁H₁₁O₈)₂(C₁₂H₈N₂)₂(H₂O)₂]·1.5C₃H₇NO·3H₂O}_n, (I), poly[[di‐μ‐aqua‐bis{μ₄‐3,3′‐[(5‐carboxylato‐1,3‐phenylene)bis(oxy)]dibenzoato‐κ⁵O¹:O^1′,O³:O⁵:O^5′}bis(1,10‐phenanthroline‐κ²N,N′)tricobalt(II)] diethylamine disolvate tetrahydrate], {[Co₃(C₂₁H₁₁O₈)₂(C₁₂H₈N₂)₂(H₂O)₂]·2C₂H₇N·4H₂O}_n, (II), and catena‐poly[[aqua(1,10‐phenanthroline‐κ²N,N′)zinc(II)]‐μ‐5‐(3‐carboxyphenoxy)‐3,3′‐oxydibenzoato‐κ²O¹:O³], [Zn(C₂₁H₁₂O₈)(C₁₂H₈N₂)(H₂O)]_n, (III), have been synthesized by the reaction of different metal ions (Ni²⁺, Co²⁺ and Zn²⁺), 3,3′‐[(5‐carboxy‐1,3‐phenylbis(oxy)]dibenzoic acid (H₃cpboda) and 1,10‐phenanthroline (phen) under solvothermal conditions. All the CPs were characterized by elemental analysis, single‐crystal and powder X‐ray diffraction, FT–IR spectroscopy and thermogravimetric analysis. Complexes (I) and (II) have isomorphous structures, featuring similar linear trinuclear structural units, in which the central Ni^II/Co^II atom is located on an inversion centre with a slightly distorted octahedral [NiO₆]/[CoO₆] geometry. This comprises four carboxylate O‐atom donors from two cpboda^3? ligands and two O‐atom donors from bridging water molecules. The terminal Ni^II/Co^II groups are each connected to the central Ni^II/Co^II cation through two μ_1,3‐carboxylate groups from two cpboda^3? ligands and one water bridge, giving rise to linear trinuclear [M₃(μ₂‐H₂O)₂(RCOO)₄] (M = Ni²⁺/Co²⁺) secondary building units (SBUs) and the SBUs develop two‐dimensional‐networks parallel to the (100) plane via cpboda^3? ligands with new (3²·4)₂(3²·8³·9)₂(3⁴·4².8²·9⁴·10³) topological structures. Zinc complex (III) displays one‐dimensional coordination chains and the five‐coordinated Zn atom forms a distorted square‐pyramidal [ZnO₃N₂] geometry, which is completed by two carboxylate O‐atom donors from two distinct Hcpboda^2? ligands, one O atom from H₂O and two N atoms from a chelating phen ligand. Magnetically, CP (I) shows weak ferromagnetic interactions involving the carboxylate groups, and bridging water molecules between the nickel(II) ions, and CP (II) shows antiferromagnetic interactions between the Co²⁺ ions. The solid‐state luminescence properties of CP (III) were examined at ambient temperature and the luminescence sensing of Cr₂O₇^2?/CrO₄^2? anions in aqueous solution for (III) has also been investigated.     

Partial evolution based local adiabatic quantum search

Recently, Zhang and Lu provided a quantum search algorithm based on partial adiabatic evolution, which beats the time bound of local adiabatic search when the number of marked items in the unsorted database is larger than one. Later, they found that the above two adiabatic search algorithms had the same time complexity when there is only one marked item in the database. In the present paper, following the idea of Roland and Cerf [Roland J and Cerf N J 2002 Phys. Rev. A 65 042308], if within the small symmetric evolution interval defined by Zhang et al., a local adiabatic evolution is performed instead of the original “global” one, this “new” algorithm exhibits slightly better performance, although they are progressively equivalent with M increasing. In addition, the proof of the optimality for this partial evolution based local adiabatic search when M=1 is also presented. Two other special cases of the adiabatic algorithm obtained by appropriately tuning the evolution interval of partial adiabatic evolution based quantum search, which are found to have the same phenomenon above, are also discussed.     

The effects of 60Co γ-ray irradiation on the DC characteristics of enhancement-mode AlGaN/GaN high-electron-mobility transistors

The effects of 60Co γ-ray irradiation on the DC characteristics of AlGaN/GaN enhancement-mode high-electron-mobility transistors (E-mode HEMTs) are investigated. The results show that having been irradiated by 60Co γ-rays at a dose of 3 Mrad (Si), the E-mode HEMT reduces its saturation drain current and maximal transconductance by 6% and 5%, respectively, and significantly increases both forward and reverse gate currents, while its threshold voltage is affected only slightly. The obvious performance degradation of E-mode AlGaN/GaN HEMTs is consistent with the creation of electronegative surface state charges in the source-gate spacer and gate-drain spacer after being irradiated.     

三联吡啶锇Os(Ⅱ)配合物为光敏剂的二元铁氢化酶模拟化合物的合成及其光物理过程

合成了以三联吡啶锇Os(Ⅱ)配合物为光敏剂的PS-Fe₂S₂型模拟铁氢化酶分子光催化剂1a及其分子间光催化模型化合物1b和2, 研究了配合物1a和1b的吸收光谱, 发光光谱及电化学性质. 配合物1a和1b均表现出三联吡啶锇Os(Ⅱ)配合物的MLCT吸收峰; 与不含Fe₂S₂基团的配合物1b相比, 在配合物1a中三联吡啶锇Os(Ⅱ)配合物单元的发光被明显猝灭, 猝灭程度为92%. 而在同样浓度下, 配合物1b与2组成的分子间体系中三联吡啶锇Os(Ⅱ)配合物的发光仅被猝灭了4%. 通过Rehm-Weller方程计算得出由三联吡啶锇Os(Ⅱ)配合物单元到Fe₂S₂活性中心的光致电子转移自由能为正, 表明分子内1a和分子间1b+2体系均不能发生光致电子转移, 体系发光猝灭的原因是三联吡啶锇Os(Ⅱ)配合物³MLCT激发态与铁氢化酶模拟活性中心Fe₂S₂的能量转移.