Extracting the low-energy constant ${L}_{0}^{r}$ at three flavors from pion-kaon scattering

Based on our analysis of the contributions from the connected and disconnected contraction diagrams to the pion-kaon scattering amplitude, we provide the first determination of the only free low-energy constant at ${ \mathcal O }({p}^{4})$, known as ${L}_{0}^{r}$, in SU (4∣1) Partially-Quenched Chiral Perturbation theory using the data from the Extended Twisted Mass collaboration, ${L}_{0}^{r}(\mu ={M}_{\rho })=0.77(20)(25)(7)(7)(2)\cdot {10}^{-3}$. The theory uncertainties originate from the unphysical scattering length, the physical low-energy constants, the higher-order chiral corrections, the (lattice) meson masses and the pion decay constant, respectively.     

Few-photon routing via chiral light-matter couplings

A quantum router is one of the essential elements in the quantum network. Conventional routers only direct a single photon from one quantum channel into another. Here, we propose a few-photon router. The active element of the router is a single qubit chirally coupled to two independent waveguides simultaneously, where each waveguide mode provides a quantum channel. By introducing the operators of the scatter-free space and the controllable space, the output state of the one-photon and two-photon scattering are derived analytically. It is found that the qubit can direct one and two photons from one port of the incident waveguide to an arbitrarily selected port of the other waveguide with unity, respectively. However, two photons cannot be simultaneously routed to the same port due to the anti-bunch effect.     

Phase structures of neutral dense quark matter and applicationto strange stars

In the contact interaction model,the quark propagator has only one solution,namely,the chiral symmetry breaking solution,at vanishing temperature and density in the case of physical quark mass.We generalize the condensate feedback onto the coupling strength from the 2 flavor case to the 2+1 flavor case,and find the Wigner solution appears in some regions,which enables us to tackle chiral phase transition as two-phase coexistences.At finite chemical potential,we analyze the chiral phase transition in the conditions of electric charge neutrality andβequilibrium.The four chemical potentials,μ_u,μ_d,μ_s and He,are constrained by three conditions,so that one inde-pendent variable remains:we choose the average quark chemical potential as the free variable.All quark masses and number densities suffer discontinuities at the phase transition point.The strange quarks appear after the phase trans-ition since the system needg more energy to produce a d.-quark than an s-quark.Taking the EOS as an input,the TOV equations are solved numerically,and we show that the mass--radius relation is sensitive to the EOS.The max-imum mass of strange quark stars is not susceptible to the parameter Aq we introduced.     

Investigation of brush-type chiral stationary phases based on O,O'-diaroyl tartardiamide and O,O'-bis-(arylcarbamoyl) tartardiamide

Four chiral organosilanes based on O,O'-dibenzoyl tartardiamide, O,O'-bis-(3,5-dimethylbenzoyl) tartardiamide, O,O'-bis-(phenylcarbamoyl) tartardiamide and O,O'-bis-[(3,5-dimethylphenyl)carbamoyl] tartardiamide were synthesized and immobilized on silica to afford corresponding brush-type chiral stationary phases (CSPs) with well-defined structures. Using 54 compounds containing a wide variety of structures as analytes, the enantioselectivities of the four CSPs were evaluated under normal-phase modes. 3,5-Dimethyl substituent in the aryl group was found to significantly affect the enantioselectivity of CSPs containing aryl ester moieties. Aryl carbamate moieties in CSPs were observed more beneficial for enantioseparation than aryl ester moieties. The additional hydrogen-bond donors (NH) present in the carbamate groups contributed greatly to the enantioselectivity of CSPs, which is contrary to the results that have been found in network-polymeric CSPs.     

双-2-萘甲酸烷基酯的分子内类立方烷光二聚体的手性拆分

双-2-萘甲酸多亚甲基二醇酯(N-Mn-N,n=2,3,4,5)在环己烷中进行光二聚反应的效率和产物的结构明显受链节长度的影响.N-M3-N生成反式-头头和顺式-头头两种结构的类立方烷,而N-M4-N和N-M5-N高产率、高区域选择性地生成反式-头头结构的类立方烷.更有意义的是,我们利用高效液相色谱成功拆分了反式-头头结构的分子内光二聚产物.     

Chiral cyanide-bridged 1D Fe~Ⅲ-Mn~Ⅲ heterobimetallic chains: Synthesis, structures and magnetic properties

Two couples of enantiomerically pure chiral cyano-bridged heterobimetallic one-dimensional (1D) chain complexes: [Mn((R,R)-Salphen)Fe(Tp)(CN)3]n (1) and [Mn((S,S)-Salphen)Te(Tp)(CN)3]n (2) (Salphen = N,N’-1,2-diphenylethylenebis (salicylideneiminato) dianion, Tp = tris(pyrazolyl) hydroborate), [Mn((R,R)-Salphen)Fe(Tp*)(CN)3·2H2O]n (3) and [Mn((S,S)-Salphen)Fe(Tp*)(CN)3·2H2O]n (4) (Tp* = hydridotris (3,5-dimethylpyrazol-1-yl) borate), have been successfully synthesized by the reactions of MnIII schiff-base complexes with the tricyanometalate building block, [(LTp)Fe(CN)3]- (LTp = Tp or Tp*). All complexes are made up of neutral cyano-bridged zigzag double chains with (-Fe-C≡N-Mn-N≡C-)n as the repeating unit. Circular dichroism (CD) spectra confirm the enantiomeric nature of the optically active complexes. Magnetic studies demonstrate that ferromagnetic interactions are operative in these complexes. The ferromagnetic couplings become weak in the chains with the bending of the Mn-N≡C angles.     

单一手性锌配位聚合物：晶体结构，荧光及介电性质

在原位水热条件下,单一手性有机配体(S)-甲基-2-(4-氰基苯胺)-3-(4-羟基苯)丙酸甲酯与叠氮化钠和氯化锌反应,得到了一个新的四唑锌配位聚合物{[Zn(TBHPA)H2O].H2O}n(1,TBHPA=(S)-2-(4-(2H-tetrazol-5-yl)benzylamino)-3-(4-hydroxy-phenyl)propa-noic acid)。单晶结构表明该化合物结晶在手性空间群P212121,CD谱进一步证实该化合物固体粉末具有单一手性。倍频实验结果表明化合物1的SHG(倍频效应)响应大概是尿素的0.6倍。荧光测定结果显示该化合物在428 nm处有较强的荧光发射峰(激发波长319 nm)。另外,还研究了化合物1在室温条件下不同频率的介电常数变化。     

氨基硼烷化合物的合成及应用研究进展

氨基硼烷化合物近年来在储氢材料的开发以及在有机合成中的应用非常广泛。本文综述了氨基硼烷的合成及其作为储氢材料的研究进展,以及近十几年来氨基硼烷在有机合成中作为还原试剂、在不对称还原反应中作手性催化剂及其他反应中的应用研究进展。指出加入金属氢化物制备的金属氨硼烷具有较优的放氢性能、可再生氨硼烷储氢材料的开发和制备是储氢材料新的发展方向;发展清洁高效的绿色还原体系和高选择性的手性氨硼烷催化剂是氨硼烷研究领域的新热点;氨硼烷试剂在储氢材料开发和绿色还原试剂领域具有潜在的实际应用价值。     

以L-酒石酸正己酯-硼酸配合物作为反相液相色谱手性流动相添加剂拆分5种β-受体阻滞剂

本文以L-酒石酸正己酯-硼酸配合物为手性流动相添加剂,建立了普萘洛尔、艾司洛尔、美托洛尔、比索洛尔、索他洛尔和阿替洛尔六种β-受体阻滞剂的反相高效液相色谱手性分离方法。对影响对映体分离的主要因素：L-酒石酸正己酯、硼酸浓度,缓冲溶液种类、浓度、pH值和有机改性剂-甲醇含量等进行了详细考察。最佳色谱条件为：Venusil MP-C18色谱柱（4.6 mm × 250 mm,5 μm）,流动相为15 mmol/L乙酸铵-甲醇（体积比为20: 80或30: 70,含60 mmol/L硼酸,70 mmol/L L-酒石酸正己酯,醋酸调节pH值6.00）,检测波长214 nm。在最佳分离条件下,五对对映体（普萘洛尔、艾司洛尔、美托洛尔、比索洛尔、索他洛尔）可以分别获得基线分离。