气相色谱法测定肌醇

 :将肌醇进行乙酰化衍生后得到肌醇六乙酯,然后用气相色谱法分析肌醇六乙酯,测得肌醇的含量。这种分析方法的变异系数为0.15%,回收率为98.2%～104.3%。方法简捷,是一种较好的测定肌醇含量的方法。     

Point-based integration for 3D object reconstruction from Ladar range images

A method of point-based integration from multiple registered laser radar (Ladar) range images for 3D object reconstruction is presented in this literature. Our method operates surface point data directly and provides a direct way for overlapping data removal. The overlapping areas were detected using a single distance threshold. In order to set the distance threshold, a local point density approach is introduced to solve it. Compared with the mesh-based, volumetric and other points-based integration approaches, our method is simple and fast, and need less storage memory. The approach is performed on various objects with different geometric shapes. The experimental results demonstrate the efficiency and feasibility of our method.     

Ab initio MRCI+Q study on the low-lying excited states of the PBr radical including spin–orbit coupling†

High-level ab initio calculations have been performed on the PBr radical by using multi-reference configuration interaction method plus Davidson correction (+Q) with correlation-consistent quadruple-ζ quality basis set. The potential energy curves (PECs) of the 22 Λ–S states of PBr have been obtained, most of which are reported for the first time. From the PECs of the bound states, the spectroscopic constants have been determined, in good agreement with the experimental results where available. Due to the large state density, there exhibits complicated interactions in the electronic excited states of PBr. The possible interactions by the spin–orbit coupling (SOC) effect have been discussed based on the evaluated R-dependent spin–orbit matrix elements. The 51 Ω states, generating from the 22 Λ–S states after taking SOC into account, have been computed. The Λ–S component analysis of the wavefunctions for the Ω states indicates the strong interaction of the Λ–S states especially at the avoided crossing points and near the dissociation limits. Finally, the transition dipole moments of several transitions arising from upper Ω states to the X₁0⁺ and X₂1 states and the corresponding radiative lifetimes have been studied. Our calculation results provide new information that should be valuable for further experimental studies on the electronic excited states of the PBr radical.     

Studies on Synthesis,Characterization, and Luminescence Properties of A Novel Light Conversion Agent of Eu (III) and Compatibility with PE

A novel light conversion agent (NLCA) has been synthesized that is applicable to polyethylene (PE) film. The composition and structure of the NLCA was characterized by elemental analysis, Fourier transform infrared (FT‐IR) spectroscopy, and nuclear magnetic resonance (NMR) spectrometry. The morphology, particulate dimensions, dispersion property and compatibility of the NLCA were characterized by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The results indicate that the average particulate dimension was about 60–100 nm and they were dispersed well in the PE film. The luminescence property of the NLCA was studied via fluorescent spectrometry. The fluorescence spectra of the NLCA show that the NLCA has a highly efficient luminescence.     

[(2,2′-bipy)2VO2](H2BO3)·3H2O的水热合成和晶体结构

A hydrothermal reaction of NaVO₃, Ce(NO₃)₃, H₃BO₃, 2,2′-bipyridine and water in a molar of 1∶2∶3∶2∶333 gives a yellow crystal [(C₁₀H₈N₂)₂VO₂](H₂BO₃)·3H₂O. It crystallizes in a triclinic with space group P1 and unit cell parameters a=0.6643(1)nm, b=1.1794(2)nm, c=1.4822(3)nm, α=101.39(3)°, β=101.59(3)°, γ=97.15(3)°, Z=2, D_c=1.542g·cm^-3, μ=0.508mm^-1, F(000)=528, R₁=0.0736, wR₂=0.1998,Goof=1.071. X-ray crystallographic study showed that the VN₄O₂ octahedron unit is distorted, in which the V1 atom is coordinated by two terminal O1 and O₂ atoms, and N1, N2, N3 and N4 atoms from two 2,2′-bipy ligands. The hydrogen bonding are observed between 2,2′-bipy and adjacent terminal oxygen atom. It is noteworthy that π-π stacking interaction between adjacent 2,2′-bipy groups plays an significant role in stabilization of the structure of crystal. CCDC: 194327.     

红外光谱法测定异氰酸酯的封闭率

依据Beer-Lambert定律两种基团的吸收值之比与其相应的质量比成比例的原理,采用红外光谱法测定异氰酸酯加成物中两种官能团的吸收值比值,从而测定体系中异氰酸酯的含量,并最终计算出异氰酸酯的封闭率。实验结果表明,红外光谱法测定异氰酸酯的封闭率快速准确。     

层级纳米花环状Bi2O3/(BiO)2CO3复合材料光催化降解罗丹明B

通过程序升温水热法制备了层级纳米花状结构Bi₂O₃/（BiO）₂CO₃复合材料（简称BO/BCO）。采用X射线衍射（XRD）、紫外-可见漫反射吸收光谱（UV-Vis/DRS）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）和氮气吸附-脱附测定等方法对上述合成材料的晶型结构、组成、光吸收性质、形貌和表面物理化学性质进行了表征。结果表明,该复合材料中（BiO）₂CO₃的晶型为四方相,Bi₂O₃的晶型为单斜相,复合后的材料同时具有两者晶型结构。并且,合成时随着OH-的引入与反应时间的增加,复合材料中（BiO）₂CO₃的特征衍射峰强度逐渐降低,Bi₂O₃的特征衍射峰强度逐渐增加,证明了Bi₂O₃在样品中所占比例的增加。从UV-Vis/DRS吸收光谱分析结果显示,与单体（BiO）₂CO₃和单体Bi₂O₃相比,合成的BO/BCO复合材料的吸收边带发生偏移,且Bi₂O₃的引入有效增加其可见光区吸收。同时,样品由片状（BiO）₂CO₃生长为层级纳米花环状结构的BO/BCO-0.5,而层级结构的形成导致BO/BCO-0.5的带隙能变窄,且对于光电子的反射与散射发生改变,从而有利于光生电荷的转移与光的吸收效率。另外,以罗丹明B为模型分子,通过不同光源照射下的光催化活性实验,循环实验以及捕获实验对复合材料BO/BCO的光催化活性进行了研究。结果表明,与其他体系（单体Bi₂O₃和P25）相比,BO/BCO-0.5活性有明显提高,并且在多次循环实验后依然保持良好的稳定性。为此,根据捕获实验结果推测了BO/BCO复合材料可能的光催化反应机理。     

以4’-羟基-联苯-4-羧酸和1,3-二(4-吡啶基)丙烷构筑的一维锌配位聚合物的晶体结构与荧光性质

水热条件下采用Zn(NO3)2.6H2O,4′-羟基-联苯-4-羧酸和1,3-二(4-吡啶基)丙烷作为反应物合成出一个新的一维锌金属配位聚合物{[Zn(Hhbc)2(bpp)].H2O}n(1)(Hhbc=4′-羟基-联苯-4-羧酸,bpp=1,3-二(4-吡啶基)丙烷),并分别用元素分析、红外光谱、差热分析、X-射线粉末衍射和X-射线单晶衍射等表征了该结构。晶体结构分析结果表明:化合物1为一维链状锌(Ⅱ)配位聚合物,通过分子间的O-H…O氢键作用,一维链进一步被连接成二维超分子结构。荧光分析表明常温固态下配合物1发射蓝色荧光,荧光寿命为3.08 ns(480 nm)。     

Keggin型多酸基晶态材料的合成及催化性能

通过引入Keggin型多酸离子[PW₁₂O₄₀]^3-到Co-bbp(bbp:3,5-双(4-吡啶基)吡啶)体系中,在水热条件下合成一个新的物质Co{bbp}₂(H₂O)₄(HPW₁₂O₄₀)(1)。 通过X射线单晶衍射(CDD)分析表明该化合物为单斜晶系,C2空间群。 所呈现的结构由金属Co和有机配体bbp配合形成金属-有机单体,然后通过配体间的π…π键堆积成二维层状框架结构,多酸[PW₁₂O₄₀]^3-作为模板嵌入框架的空穴内,形成一个以多酸为模板超分子化合物。 通过研究化合物1的催化性质,结果发现其对罗丹明B(RhB)具有很好的催化降解能力(可见光照120 min后降解率为94%),并且可以电催化亚硝酸根(NO₂^-)和抗坏血酸(AA),是一个具有多功能的催化剂。