The ν1 and ν4 fundamental bands of H3SiCl investigated with high resolution

The gas phase infrared spectrum of monoisotopic H₃Si³⁷Cl has been reinvestigated in the ν₁/ν₄ region near 2200 cm⁻¹, using a Fourier transform spectrometer, with a nominal resolution of 0.0027 cm⁻¹. The rovibrational analysis confirms, besides the weak Coriolis x, y resonance between the (v₁ = 1) and (v₄ = 1) levels, the existence of two strong local perturbations in the ν₄ band. These are caused by rotational (Δk = Δl = ±1) type resonances with and , respectively. Another local perturbation of the 12 ? KΔK ? 14 subbands of the ν₄ band, probably due to a (Δk = Δl = ±1) interaction with , was detected and analyzed. All these local perturbations have been studied individually using a simple model of two interacting sublevels. Without the transitions involved in the local perturbations, more than 2000 lines of the ν₁/ν₄ band system were used to obtain a complete set of vibration-rotation parameters set for the v₁ = 1 and v₄ = 1 states. By means of a band contour simulation, both the transition moment ratio ∣M₄:M₁∣ = 1.25 and a positive sign of the Coriolis intensity perturbation were determined.The present results, together with the accurate existing data for ν₂, ν₃, ν₅, and ν₆ bands, allowed us to derive the experimental values, A_e = 2.8722945(37) cm⁻¹ and B_e = 0.2182248(22) cm⁻¹, which are compared with those of ab initio calculations.     

Raman and mid-infrared spectroscopic study of geometrically frustrated hydroxyl cobalt halides at room temperature

Mid-infrared absorption and Raman spectra of the geometrically frustrated material series,hydroxyl cobalt halides β-Co 2 (OH) 3 Cl and β-Co 2 (OH) 3 Br,are first,to the best of our knowledge,measured at room temperature,to study the corresponding relationship between their vibrational spectral properties and crystal microstructures.Through the comparative analysis of the four spectra we have categorically assigned the OH-related vibration modes of hydroxyl groups in the trimeric hydrogen bond environment (Co 3 ≡OH) 3… Cl/Br,and tentatively suggested vibration modes of O-Co-O,Co-O and Cl/Br-Co-Cl/Br units.These results can also become the basis for analysing their low-temperature spectral properties,which can help to understand the underlying physics of their exotic geometric frustration phenomena around phase transition temperatures.     

Synthesis, growth, spectral, thermal and photoluminescence properties of a new semiorganic NLO crystal—Thiosemicarbazide lithium chloride [TSLC]

Thiosemicarbazide lithium chloride [TSLC] a new semiorganic nonlinear optical crystal has been synthesized. Single crystals by TSLC have been grown by slow evaporation solution growth technique at room temperature. Chemical composition of the synthesized material was confirmed by elemental analysis. Powder X-ray diffraction (XRD) pattern of the grown crystal has been studied. Functional groups present in the materials were identified by FT IR spectral analysis ranging between 4000 and 450 cm⁻¹. The optical transmission was studied through UV-vis spectrophotometer. Thermal analysis is carried out on the crystal and inferred to be stable at 176 °C. The second harmonic generation (SHG) of the TSLC crystal was confirmed using Nd:YAG laser and also fluorescence spectral analysis is carried out for the TSLC crystal.     

氯化镉与对甲基苯胺配位反应的热化学研究

用新型的具有恒定温度环境的反应热量计,以一定比例的 HCl（3.0 mol·L-1）与无水乙醇的混合溶液作为量热溶剂,分别测定了反应物[CdCl2·5/2H2O,p-tol]和产物[Cd（p-tol）2Cl,H2O]的溶解焓,设计了一个新的热化学循环,得到了氯化镉与对甲基苯胺配位反应的反应焓△rHm=-7.598kJ·mol1-,并计算出了配合物Cd（p-tol）2Cl2的标准生成焓.推荐其值为:△rHm=（p-tol）2Cl2,s]=-490.773kJ·mol-1     

[1ChCl∶2EG]/CrCl3·6H2O离子液体中Cr(Ⅲ)配合物的研究

利用电喷雾质谱(ESI-MS)和紫外-可见吸收光谱(UV-Vis)分析,研究了CrCl₃·6H₂O 浓度为0.1～0.6 mol·L-1的水溶液和[1ChCl∶2EG]/CrCl₃·6H₂O ILs中,Cr(Ⅲ)配合物的存在形式。研究结果表明,在含有CrCl₃·6H₂O的溶液中,Cr(Ⅲ)与Cl-和H₂O形成[Cr(H₂O)_nCl_6-n]n-3配合物,其配合物的优势物种受CrCl₃·6H₂O浓度的影响。水溶液中Cr(Ⅲ) 的优势配合物为[Cr(H₂O)₆]3+与[Cr(H₂O)₅Cl]2+,并随CrCl₃·6H₂O浓度增加,水溶液的UV-Vis吸收光谱峰红移,[Cr(H₂O)₅Cl]2+的相对含量增加。而[1ChCl∶2EG]/CrCl₃·6H₂O ILs中的优势配合物为[Cr(H₂O)₂Cl₄]-和[Cr(H₂O)₃Cl₃],且随CrCl₃·6H₂O 浓度增加,溶液的颜色从浅橙红色逐渐变为深绿色,溶液的UV-Vis吸收光谱峰蓝移,[Cr(H₂O)₃Cl₃]的相对量增加。说明CrCl₃·6H₂O的浓度变化,将影响配体Cl-和H₂O与Cr(Ⅲ)配位结合的配位数,从而影响配合物优势物种的相对量。     

间接原子吸收光谱法测定氢溴酸山莨菪碱

研究了原子吸收光谱法间接测定氢溴酸山莨菪碱。在溶液pH为 5 1～ 5 3,当四苯硼钠过量时可完全沉淀氢溴酸山莨菪碱 ;加入过量的氯化钾沉淀滤液中剩余的四苯硼钠 ;干过滤 ,用原子吸收分光光度计在76 6 5nm波长下测定滤液中过量的钾 ,因四苯硼钠与氢溴酸山莨菪碱和氯化钾均按 1∶1的计量关系生成沉淀 ,可以直接计算得到氢溴酸山莨菪碱的含量。对氢溴酸山莨菪碱注射液进行了测定 ,测定结果准确。方法简单快速 ,回收率在 96 %～ 10 3%之间 ,相对标准偏差为 1 4 %。该方法可进一步推广原子吸收光谱法在其他相关药物测定方面的应用。     

吡罗红为底物的辣根过氧化物酶催化荧光反应测定葡萄糖

吡罗红在辣根过氧化物酶催化下可被过氧化氢氧化而使其荧光猝灭。在pH 7.2中性介质中,稳态催化速率由酶和底物浓度决定,催化体系服从Michaelis-Menten方程,用Lineweaver-Burk作图法求得米氏常数、最大反应速度、催化常数分别为2.4×10~(-5)mol·L-1,2.5×10~(-6)mol·L-1s-1,75.8 s-1。在最佳反应条件下,荧光F0/F的猝灭程度与过氧化氢浓度在0-3.6×10~(-7)mol·L-1范围内成线性关系,检测限为6.3×10~(-9)mol·L-1;当与葡萄糖氧化酶联用时,可定量检测葡萄糖,线性关系为0-8.0×10~(-7)mol·L-1,检测限为3.4×10~(-8)mol·L-1。方法用于分析人血清中葡萄糖含量,分析结果与苯酚-4-氨基安替比林法基本一致。     

Surface modification of an epoxy resin with polyamines via cyanuric chloride coupling

The presence of polyamine groups on the surface of dielectric resins potentially improves the adhesion with electrochemically deposited metals. In this article, first cyanuric chloride is covalently bound to the surface hydroxyl groups of the epoxy resin. The remaining reactive sites on the coupled cyanuric chloride molecule are then used to anchor polyamines. New data on the triazine coupling is presented. The surface reactions are monitored and characterized by means of ATR-IR, SEM-EDS, XPS and ToF-S-SIMS.     

Ammonium Nitrate as an Eco–Friendly Oxidizer for Composite Solid Propellants: Promises and Challenges

Ammonium nitrate (AN) has received attraction globally not only as a nitrogenous fertilizer but also as an oxidizer in gas generators and propellants. Nowadays, great attention is being focused on the development of composite solid propellants with green oxidizers in realizing eco–friendly combustion products. The ammonium perchlorate (AP), which is the work horse oxidizer in composite propellant, needs replacement due to its environmental and human health issues. In this context, AN is regarded as an alternative to AP because of its easy availability and environmentally friendly chlorine free combustion products. However, AN has its own inherent drawbacks such as hygroscopicity, room temperature phase transition, and low burning rate. Recently, several studies have been focused on its phase stabilization and burning rate modification so as to develop solid propellants with improved properties. The knowledge of thermal characteristics of AN is a crucial factor for its applications in propellants and gas generators. This article details the different aspects of polymorphism, phase stabilization, thermal decomposition, hygroscopicity, specific impulse, and burn rate modification of AN and also addresses ways to overcome the inherent weakness of AN as a propellant oxidizer in formulating an effective propellant composition.     

Effect of power ultrasound on crystallization characteristics of magnesium ammonium phosphate

Magnesium ammonium phosphate (MAP) crystallization could be utilized for the recovery of phosphorus from wastewater. However, the effectiveness of the recovery is largely determined by the crystallization process, which is very hard to be directly observed. As a result, a specific ultrasonic device was designed to investigate the crystallization characteristics of MAP under various ultrasonic conditions. The results demonstrated that the metastable zone width (MZW) narrowed along with the rising of the ultrasonic power. Similarly, for the 6 mM MAP solution, with the ultrasonic power gradually enhanced from 0 W to 400 W, the induction time was shortened from 340 s to 38 s. Meanwhile, the crystallization rate was accelerated till the power reached 350 W, and then remained a constant value. It can be observed from the scanning electron microscopy (SEM), the MAP crystal became bigger in size as well as the crystal size distribution (CSD) became broad and uneven, with the increase of ultrasonic power. The results indicate that the crystallization process enhanced by power ultrasound could be used as an effective method to eliminate and recover the phosphorus from wastewater.