高温弱还原气氛下高硅铝比煤灰变化行为的研究

利用XRD和FT-IR考察了两种高硅铝比煤(小龙潭褐煤、府谷烟煤)灰中矿物质在高温(1 100~1 500 ℃)弱还原气氛下的演变行为。通过FACT sage对煤中矿物质主要组分在高温下的变化进行了计算,并与XRD和FT-IR结果进行了比较和验证。结果表明,两种高硅铝比煤中矿物质在高温下的演变行为具有很大的差异,高温下,氧化钙含量较高的煤灰主要生成钙镁黄长石和钙长石等长石类矿物质,氧化钙含量较低的煤灰主要生成铝硅酸盐和少量的钙长石、拉长石等。氧化铁对晶体组成影响不明显;二氧化硅的含量随着温度的升高逐渐减少;低温共熔体系的存在降低了高硅铝比煤灰的灰熔点,同时,增加了高温煤灰中非晶体的含量。FACT sage热力学计算结果与XRD、FT-IR分析结果一致。     

热分析-傅里叶红外光谱-气相色谱-质谱联用技术分析果胶的热分解产物

将热分析-傅里叶红外光谱-气相色谱-质谱组成同步联用检测系统,对果胶在N2气和N2/O2氛围中,243、270和335 ℃ 3个温度点的热解产物经傅里叶红外光谱和GC-MS进行同步分析,在2种氛围下共检测鉴别了26种热分解产物。     

季铵盐从氰化物溶液中萃取金的研究:基于氢键结构的萃合物模型

通过 Ｆｏｕｒｉｅｒ变换红外光谱（ＦＴ－ＩＲ）,扩展Ｘ射线吸收精细结构（ＥＸＡＦＳ）,等离 子发射（ＩＣＰ）和同位素示踪等方法对氯化甲基三烷基铵（Ｎ２６３）－磷酸三丁酯（ＴＢＰ）－正十二 烷和Ｎ２６３－异辛醇－正十二烷从ＫＡｕ（ＣＮ）_２水溶液中萃取金的机理进行了深入的研究．应 用高分辨红外光谱证实负载有机相中ＣＮ伸缩振动吸收随萃金体系中助萃剂的不同而不 同,并将负载有机相中Ａｕ（ＣＮ）_２~－与助萃剂的相互作用归因于氢键机制,认为萃金体系中 的萃合物模型为基于氢键的超分子体系     

Photocatalytic Reduction of NO with C2H6 on a Hollandite-Type Catalyst

The photocatalytic reduction of nitrogen monoxide (NO) with ethane on the hollandite type catalyst (K₂Ga₂Sn₆O₁₆KGSO) was investigated. Using a closed-gas circulating system equipped with a Q-MASS detector and in-situ diffuse reflectance FT-IR spectroscopy. The reactant gases of NO and ¹³C₂H₆ decreased with the increasing irradiation time. In contrast, the N₂ yield increased proportionally to the conversion of ¹³C₂H₆. Nitrogen oxides such as N₂O did not reach their detectable levels. The NO adsorbed on KGSO was found to change to its activated species by UV irradiation. The oxidized products of C₂H₆ such as CH₃CHO increased in proportion to the reaction time. The present results strongly suggest that KGSO has remarkable photocatalytic activity for the reduction of NO with C₂H₆.     

光谱法研究钢铁表面彩色Mo-S-Fe簇合物膜

研究MoS4^2-在钢铁表面发生配位反应形成的具有装饰效果的多种彩色Mo-S-Fe簇合物膜。FT-IR、F-IR、FT-Raman、XPS和AES分析表明,簇合物膜以Fe(Ⅲ)、Mo(Ⅵ)状态存在,膜内层以Fe(Ⅱ)、Mo(Ⅳ)和Mo(Ⅵ)共存,S和O都-2价,膜表面含少量 4、 6价硫。从AES深度分布曲线的组成恒定区求得各组成元素的相对原子百分比浓度和膜层厚度,反应时间越长,膜越厚,膜为多分子层结构。加热后膜层所含元素种类及价态不变,但元素分布有所改变。     

Synthesis, Characterization and Crystal Structure of （Z）-1-[2-（Triarylstannyl）vinyl]-1-indanols and Their Arylhalostannyl Derivatives

(Z)-1-[2-(Tri-o-tolylstannyl)vinyl]-1-indanol (1) and (Z)-1-[2-(tri-p-tolylstannyl)vinyl]-l-indanol (2) were synthesized by the addition reaction of 1-ethynylindanol with tri-o-tolyltin and tri-p-tolyltin hydride. The aryl groups in compound 1 and 2 were substituted by Br2 or I2 to yield monohalide derivatives (3-6). The compounds 1-6 were characterized by elemental analysis, ^1H NMR and FT-IR spectroscopy. The crystal structures of 1, 2 and 4 have been determined by single crystal X-ray diffraction analysis. The Sn atom in 1 and 2 exhibits a tetrahedral geometry distorted towards trigonal bipyramid due to a weak intramolecular interaction between Sn and the hydroxyl O atoms [0.2839(4) nm and 0.2744(5) nm], while the Sn atom in 4 adopts a trigonal bipyramidal geometry with a significant O→Sn(1) interaction [0.2552(5) nm].     

β-1,2,3,4,6-五-O-倍酰-D-葡萄糖与人血清白蛋白的相互作用研究

应用红外光谱和荧光光谱方法研究了人血清白蛋白 (HSA)与 β 1,2 ,3 ,4,6 五 O 倍酰 D 葡萄糖 (PGG)的相互作用 .荧光光谱结果显示 ,PGG在CPGG/CHSA<0 5和 0 5 相似文献   

Differentiation of Rhizoma Curcumas Longae and Radix Curcumae by a Multistep Infrared Macro-Fingerprint Method

A multistep infrared macro-fingerprint method was applied to identify two Chinese herbal drugs, Rhizoma Curcumas Longae (RCL) and Radix Curcumae (RC). Fourier transform infrared (FT-IR) spectra of the two were similar to each other and consistent with the 11 peaks of the spectrum of starch. RCL had a characteristic absorption peak at approximately 1514 cm^?1 that correlated to the strong peak near 1509 cm^?1 of curcumin. Between 900 cm^?1–1700 cm^?1 of the second derivative infrared (SD-IR) spectra, with higher resolution, RCL, and curcumin had 10 common peaks. In the FT-IR and SD-IR spectra of the ethanol extract, the spectra of the RCL extract and curcumin were similar, but RC was different. According to the fingerprint characteristics of the infrared spectra for RC and its extracts, the strongest peak at 1055 cm^?1; the C-O absorption peaks at 1124 cm^?1, 1106 cm^?1, and 996 cm^?1; and the strong methylene peaks at 2925 cm^?1 and 2853 cm^?1 suggest that RC contains more saccharides. In the range of 1350 cm^?1–1700 cm^?1, RCL and RC had similar two-dimensional infrared (2D-IR) correlation spectra. Both of them had three autopeaks, but the autopeaks were located at 1458 cm^?1, 1560 cm^?1, and 1641 cm^?1 for RCL and 1458 cm^?1, 1560 cm^?1, and 1669 cm^?1 for RC, suggested that the aromatic components of the two were not identical. The average correlation for the 18 RCL and 18 RC samples were 0.9906 and 0.9878, respectively, and this method achieves a good classification of the sample type.     

N-COORDINATED COPPER(II) COMPLEXES WITH 2-S-METHYL-5,5-DIMETHYLIMIDAZOLIN-4-ONE (L). CRYSTAL STRUCTURE OF [CuL4H2O][CuCl4]

Abstract

The reaction between CuX₂ (X = Cl, Br, NO₃, ClO₄) and 2-S-methyl-5,5-dimethylimidazolin-4-one (L) yields complexes having stoichiometry CuL₂Cl₂ · 1/2H₂O (1), CuL₂Br₂ (2), CuL₄X₂ · 2H₂O [X = NO₃ (3), ClO₄ (4)]. The X-ray crystal structure solved for 1 showed that it contains discrete [CuL₄ · H₂O]²⁺ and [CuCl₄]^2- ions, separated by normal van der Waals contacts. The [CuL₄H₂O]²⁺ cation has crystallographic C ₄ symmetry, with the copper atom and the oxygen of the water molecule lying on a four-fold axis of the space group P4/n and the metal atom in a square-pyramidal coordination geometry, obtained by a square basal plane defined by four N atoms and the apex occupied by the water molecule. The [CuCl₄]^2- anion shows a very flattened tetrahedral geometry. FT-IR and FT-Raman spectra of 1–4 show that 2,3 and 4 also are N(3)-coordinated to copper; nitrate and perchlorate do not coordinate. The v(CuO) vibrations are present at about 380 cm^?1 for 3 and 4, while for 2 v(CuBr) are at 224 and 215 cm^?1. Esr data for 1–4 recorded on solid samples highlight a d_x ² - y² ground state for the cation of 1, 3, and 4 which is typical for tetragonally elongated monomeric copper(II) complexes. Compound 2 exhibits two couples of g values characteristic of two independent copper centres both with compressed tetrahedral geometry. The deconvoluted reflectance spectra of 1–4 substantially confirm the presence of CuN₄ and CuBr₄ chromophores in 2 and a trans-CuN₄O₂ chromophore in 3 and 4. For the latter complexes an orbital sequence d_{x² - y²} > d_xy > d_z² > d_xy, d_yz is also suggested on the basis of the similarity between L and imidazole type ligands.     

Investigation on the Extraction Mechanism of Au（I） from Cyanide Solution with Quaternary Ammonium System

During the past decades, there has been a renewed interest in the application of solvent extraction to the recovery of Au (I) from cyanide solutions1,2. Among those various extractants, the amine extractants with the addition of organic phosphorus oxide as cosolvent have been widely investigated3,4. Various diluents and modifiers have been selected to optimize the extraction system so as to increase the loading capacity, improve the selectivity and/or reduce emulsification5. Quaternary amm…