SPAPT-CPB-AS光度法测定阴离子表面活性剂

在ＮａＯＨ介质中,新试剂１－（４－磺酸基苯基）－３－「４－（苯基偶氮）苯基」三氮烯（ＳＰＡＰＴ）和溴化十六烷基吡啶（ＣＰＢ）与阴离子表面活性剂（ＡＳ）发生显色反应,形成三元配合物。利用ＳＰＡＰＴ－ＣＰＢ－ＡＳ显色体系。研究了光度法有离子表面活性剂。最大吸收波长５９０ｎｍ,测定十二基苯磺酸钠（ＤＢＯＳＯ３Ｎａ）、十二烷基磺酸钠（ＤＯＳＯ３Ｎａ）、十二烷基硫酸钠（ＤＳＯ４Ｎａ）的表观摩尔吸光系数分别为     

沙蚕磷草酸盐的合成与光谱表征

用１－二甲氨基－２,３－二氯丙烷和Ｏ,Ｏ－二甲基－二硫代磷酸盐反应合成了一种新的有机磷杀虫剂沙蚕磷,还制备了它的草酸盐。用１Ｈ、１３Ｃ核磁共振波谱、红外光谱及质谱法表征了沙蚕磷草酸盐的分子结构,结果表明反应产物是１,３－二取代产物。沙蚕磷的分子结构为（ＣＨ３）２Ｎ＋ＨＣＨ［ＣＨ２ＳＰ（Ｓ）（ＯＣＨ３）２］２Ｃ２Ｏ４Ｈ－［Ｏ,Ｏ,Ｏ′,Ｏ′－四甲基－Ｓ,Ｓ′－（２－Ｎ,Ｎ－二甲氨基丙撑）－双－二硫代磷酸酯草酸盐］。     

电场调制下单量子阱ZnCdSe／ZnSe的激射行为研究

近年来,随着宽禁带Ⅱ－Ⅵ族半导体激光器取得突破性进展［１］,对ＺｎＳｅ基超晶格与量子阱的受激发射也进行了广泛的研究［２,３］,同时对电场调制下的ＺｎＳｅ基超晶格的受激发射也有过报导［４］．但对于电场调制下的ＺｎＣｄＳｅ／ＺｎＳｅ基单量子阱的激射行为研...     

3-methyl-4-metroxy-4'-nitrostilbene (MMONS) Crystal Growth and Studies of It

３－ｍｅｔｈｙｌ－４－ｍｅｔｒｏｘｙ－４＇－ｎｉｔｒｏｓｔｉｌｂｅｎｅ（ＭＭＯＮＳ）ＣｒｙｓｔａｌＧｒｏｗｔｈａｎｄＳｔｕｄｉｅｓｏｆＩｔｓＳｅｃｏｎｄＮｏｎｌｉｎｅａｒＯｐｔｉｃａｌＰｒｏｐｅｒｔｉｅｓ￥ＣＡＯＹａｎｇ；ＺＨＵＺｈｉｄｏｎｇ；ＨＵＡ...     

TX100胶束中光解蒽醌的TRESR研究

用时间分辨电子自旋共振（ＴＲＥＳＲ） 波谱仪研究了光解蒽醌自由基的化学诱导动态电子极化（ＣＩＤＥＰ） ．实验测量表明,在蒽醌／ 乙二醇／ＴＸ－ １００ 体系中,蒽半醌自由基ＡＱＨ·有很强极化ＥＳＲ 信号,在激光激发后～０ ．８μｓ,检测到蒽醌负离子基ＡＱ·－ 的信号,表明ＡＱＨ·自由基部分地离解为负离子基ＡＱ·－ ．     

金属羰基化合物[CpFe(CO)_2]_2与金属氧化物表面作用的傅里叶变换漫反射和光声红外光谱研究

用漫反射红外光谱和光声红外光谱法研究了金属羰基化合物［ＣｐＦｅ（ＣＯ）２］２Ｃｐ＝η５—Ｃ５Ｈ５与酸性、中性和碱性Ａｌ２Ｏ３及ＴｉＯ２的相互作用。结果表明，在Ａｌ２Ｏ３表面生成的衍生物种类及浓度与Ａｌ２Ｏ３的酸碱度明显相关。在酸性Ａｌ２Ｏ３表面，主要存在衍生物［ＣｐＦｅ（ＣＯ）２Ｆｅ—Ｈ—Ｆｅ（ＣＯ）２Ｃｐ］＋及少量的ＣｐＦｅ（ＣＯ）２（—Ｏ—）；在中性Ａｌ２Ｏ３表面存在ＣｐＦｅ（ＣＯ）２（—Ｏ—）及较少的［ＣｐＦｅ（ＣＯ）］４；而在碱性Ａｌ２Ｏ３表面主要衍生物为［ＣｐＦｅ（ＣＯ）］４及少量ＣｐＦｅ（ＣＯ）２（—Ｏ—）。衍生物的相对浓度以酸性Ａｌ２Ｏ３表面最高，碱性Ａｌ２Ｏ３表面最低。在ＴｉＯ２表面，［ＣｐＦｅ（ＣＯ）２］２结构基本未变，在空气中比较稳定，没有观察到衍生物的生成。测定了［ＣｐＦｅ（ＣＯ）２］２及其在ＴｉＯ２表面近红外漫反射光谱，指认了大部分观察到的光谱为羰基振动的合频和倍频，并尝试指认了少数光谱为高级（三级）倍频和多元组频（合频）。     

均三叠氨基三硝基苯热解反应的理论研究

用ＰＭ３－ＭＯ方法,基于热力学,统计热力学和反应速率过渡态理论,对２,４,６－三叠氮基－１,３,５－三硝基苯的热解反应机理进行了计算研究,求得各基元反应的反应物,产物和过渡态的全优化几何构型,电子结构和反应的热力学,动力学参数。结果表明,Ｎ－Ｎ２断裂和Ｃ－ＮＯ２自由基均裂反应活化能较高,ＴＡＴＮＢ的各步热解优先取“氧化呋咱”机理,且生成４,６－二叠氮基－３,５－二硝基苯并氧化呋咱的第一步反应为速率     

NiL(ClO4)2催化NaBrO3-MA-H3PO4体系振荡反应的研究

报道了一种反式Ｃｕｒｔｉｓ环的镍（Ⅱ）的配合物ＮｉＬ（ＣｌＯ４）２（Ｌ为２,４,４,９,１１,１１－六甲基－１,５,８,１２－四氮杂环十四－１,５,８,１２－四烯）催化ＮａＢｒＯ３－ＣＨ２（ＣＯＯＨ）２（ＭＡ）－Ｈ３ＰＯ４体系的化学振荡反应。测得该体系的振荡范围,研究、分析了各物种浓度、自由基抑制剂和还原剂、Ａｇ＾＋、Ｈｇ＾２＋以及温度对振荡反应的影响。结果表明Ｂｒ＾－起重要动力学控制作用,在反应     

草酰胺桥联双核铜配合物Cu2（oxen）（SCN）2从头算研究

运用Ｇａｕｓｓｉａｎ９４Ｗ量子化学程序包,采用ＬａｎＬ２ＤＺ基组,对草酰胺桥联双核铜配合物Ｃｕ２（ｏｘｅｎ）（ＳＣＮ）２［Ｈ２ｏｘｅｎ＝Ｎ,Ｎ′－二－（２－胺乙基）草酰胺］顺、反构型及基单、三重态的电子组态进行从头算研究,探讨其配合物的稳定性、分子轨道能量、原子净电荷布居规律以及电子结构特征等。结果表明：在Ｃｕ２（ｏｘｅｎ）（ＳＣＮ）２分子的４种可能的构型与组态中,最稳定的是反式三重态构型,其原因     

含MoFe3S4单元的μ2-OR或μ2-SR桥联双类立方烷簇合物的红外光谱研究

对下列含ＭｏＦｅ３Ｓ４ 单元的μ２－ＯＲ或μ２ －ＳＲ桥联双类立方烷簇合物的红外光谱进行了研究：（Ｅｔ４ Ｎ）３［Ｍｏ２Ｆｅ６ Ｓ８Ｃｌ６ （ＯＭｅ）３ ］（１）,（Ｅｔ４ Ｎ）３ ［Ｍｏ２ Ｆｅ６ Ｓ８ （ＳＰｈ）６ （ＯＭｅ）３ ］（２）,（Ｂｕ４Ｎ）３ ［Ｍｏ２Ｆｅ６Ｓ８ （ＳＰｈ）６ （ＯＭｅ）３ ］（３）,（Ｅｔ４Ｎ）３ ［Ｍｏ２Ｆｅ６Ｓ８ （ＳＢｕｔ）６（ＯＭｅ）３］（４）,（Ｅｔ４Ｎ）３ ［Ｍｏ２Ｆｅ６Ｓ８ （ＳＰｈ）９ ］（５）。通过这系列簇合物特征振动频率和结构参数及与线型Ｍｏ－Ｆｅ－Ｓ簇合物红外光谱的比较,对其νＭ ｏ－μ２Ｏ（Ｒ） ,νＭ ｏ－μ２Ｓ（Ｒ）,νＭ ｏ－Ｓ,νＦｅ－Ｓ,νＦｅ－ＳＲ,νＦｅ－Ｃｌ 进行了归属。对其中两条途径的亲电诱导效应及Δν（即νＭ ｏ－Ｓ－νＦｅ－Ｓ）与Ｆｅ→Ｍｏ 电荷迁移的关系进行了探讨。最后,讨论了桥联双类立方烷与线型Ｍｏ－Ｆｅ－Ｓ簇合物红外光谱的共性和差异。     

铜(Ⅱ)-天冬氨酸-咪唑类配合物的合成及其与DNA作用的光谱研究与比较

合成了两种新的铜(Ⅱ)-天冬氨酸-咪唑类混配配合物([Cu(HAsp)ImH2O]SO4·4H2O与[Cu(Asp)Im (OH)]·4H2O,HAsp代表天冬氨酸分子,Asp代表天冬氨酸离子,Im代表咪唑)。以元素分析、红外光谱及热重-差热分析对其进行表征;以电子吸收光谱法及荧光分析法研究了这两种配合物与DNA的作用。结果表明：两种铜(Ⅱ)-天冬氨酸-咪唑类混配配合物与DNA的作用方式明显不同：[Cu(HAsp)ImH2O]SO4·4H2O为伴随着静电作用的插入结合;而[Cu(Asp)Im (OH)]·4H2O主要与DNA的碱基N发生配位作用,造成了DNA双螺旋的破坏。分析了两种配合物因结构不同而导致的与DNA作用方式不同的原因。     

喹啉降解过程瞬态粒子的光谱分析

利用纳秒级脉冲辐解技术对喹啉在多种条件下降解过程中所生成的瞬态粒子行为进行了详细分析。探讨了喹啉在羟基、氢自由基、水合电子、SO·-₄,Br·-2、叠氮化钠等作用下生成的瞬态粒子的吸收光谱、瞬态粒子的生成和衰减行为,可作为实际含喹啉废水溶液降解研究的理论参考。     

Vibrational Spectroscopic Investigation and Theoretical Calculations of (E)-3-Phenyl-N-[4-(Phenyl-Amino) Quinazoline-7-yl] Acrylamide

ABSTRACT

Optimized geometrical structure and harmonic vibration frequencies of prior synthesized (E)-3-phenyl-N-[4-(phenyl-amino) quinazoline-7-yl] acrylamide were computed by ab initio HF and DFT/B3LYP methods using both 6-31G* and 6-311G** basis sets and the Moller–Plesset second-order perturbation (MP2) method merely at the 6-31G* level. The infrared (IR) spectrum of the title compound has been measured in the range of 400–4000 cm^?1. Complete vibrational assignments of the IR spectra were proposed. Moreover, the calculated wavenumbers of the title compound were compared with the experimental data. The correlation analyses indicate that good linearity relationships exist between the scaled theoretical vibration frequencies and the experimental values. Additionally, the atoms in molecules (AIM) method was applied to explore the possible intramolecular interactions in the title compound.     

Resonance Energy Transfer Studies from Derivatives of Thiophene Substituted 1,3,4-Oxadiazoles to Coumarin-334 Dye in Liquid and Dye-Doped Polymer Media

In the present work, we have carried out energy transfer studies using newly synthesised derivatives of thiophene substituted 1,3,4-oxadiazoles namely, 2-(-4-(thiophene-3-yl)phenyl)-5-(5-(thiophene-3-yl)thiophene-2-yl)-1,3,4-oxadiazole [TTO], 2-(-4-(benzo[b]thiophene-2-yl)phenyl)-5-(5-(benzo[b]thiophene-2-yl)-1,3,4-oxadiozole [TBO] and 2-(4-(4-(trifluoromethyl)phenyl)phenyl)-5-(5-(4-(trifluoromethyl)phenyl)thiophen-2-yl)-1,3,4-oxadiazole [TMO] as donors and laser dye coumarin-334 as acceptor in ethanol and dye-doped polymer (poly(methyl methacrylate) (PMMA)) media following steady-state and time-resolved fluorescence methods. Bimolecular quenching constant (k _q), translation diffusion rate parameter (k _d), diffusion length (D _l), critical transfer distance (R ₀), donor- acceptor distance (r) and energy transfer efficiency (E _T) are calculated. It is observed that, critical transfer distance is more than the diffusion length for all the pairs. Further, bimolecular quenching constant is also more than the translation diffusion rate parameter. Hence, our experimental findings suggest that overall energy transfer is due to Förster resonance energy transfer (FRET) between donor and acceptor in both the media and for all the pairs. In addition, considerable increase in fluorescence intensity and energy transfer efficiency is observed in dye-doped polymer matrix systems as compared to liquid media. This suggests that, these donor-acceptor pairs doped in PMMA matrix may be used for applications such as energy transfer dye lasers (ETDL) to improve the efficiency and photostability, to enhance tunability and for plastic scintillation detectors.     

Synthesis and Characterization of Molecules Containing Thiazole and Oxazole Moieties and Study of ESIPT Phenomenon

Two novel ESIPT molecules, 2-[4-(1,3-benzothiazol-2-yl)naphtho[1,2-d][1,3]oxazol-2-yl]phenol 9a and 4-[4-(1,3-benzothiazol-2-yl)naphtho[1,2-d][1,3]oxazol-2-yl]benzene-1,3-diol 9b were synthesized by condensing 1-amino-3-(1,3-benzothiazol-2-yl)naphthalen-2-ol with 2-hydroxybenzoic acid and 2,4-dihydroxybenzoic acid respectively. The novel compounds were characterized by FT-IR, (1)H NMR, Mass spectral and elemental analysis. Effect of polarity on photo physical properties, absorption and emission were studied. Compounds showed single absorption and dual emission due to ESIPT phenomenon. The structural changes due to ESIPT phenomenon in terms of bond angle, bond distances and geometry were investigated by using Gaussian 03 software. These two novel ESIPT molecules are thermally stable up to 200?°C.     

1H and 13C NMR Spectra of Alditolyl Derivatives of 3-Hydrazino-5-Methyl[1,2,4]triazino[5,6-b]indole and Their Cyclized Products.

The ¹H and ¹³C NMR spectra of sugar (5-methyl [1, 2, 4]-triazino [5, 6-b] indol-3-yl) hydrazones (1), per-0-acetyl aldehydo sugar 1-acetyl-1-(5-methyl [1, 2, 4] triazino [5, 6-b]-indol-3-yl) hydrazones (2), l- (penta-0-acetyl-pentitol-1-yl)-10-methyl [l, 2, 4] triazolo [3′, 4′:3, 4] [l, 2, 4] triazino [5, 6-b]-indoles (3) have been investigated. The 2 D NMR (H, C COSY) spectrum of 2a has been studied.     

Electron detachment dynamics of the iodide-guanine cluster: does ionization occur from the iodide or from guanine?

Laser photodissociation spectroscopy of the I^‐·guanine complex has been conducted for the first time across the regions above the electron detachment threshold to explore the excited states and whether vertical ionisation occurs from the iodide or the nucleobase. The photofragment spectra reveal a prominent dipole-bound excited state (I) close to the calculated vertical electron detachment energy (～4.0?eV) and a second excited (II) centred around 4.8?eV, which we assign to π-π* nucleobase-localised transitions. The ionic photofragments are identified as I^‐ and I^‐·[G-H], with the later fragment being produced significantly more strongly than the former. Both photofragments are observed across the two excited states, with production of the iodide being attributed to internal conversion to the ground state followed by evaporation. We trace the formation of the I^‐·[G-H] photofragment to initial vertical ionisation of guanine, followed by ejection of a proton. This two-step process is important as it follows known steps in radiation-induced damage to DNA, namely initial formation of a guanine radical cation which then forms a free radical [G-H] moiety through deprotonation. Production of the I^‐·[G-H] photofragment is pronounced through II indicating that its formation is enhanced by coupling of the π-π* transitions to the electron detachment continuum.     

Synthesis, DNA-binding, Cytotoxicity, Photo Cleavage, Antimicrobial and Docking Studies of Ru(II) Polypyridyl Complexes

Three Ruthenium(II) polypyridine complexes, [Ru(phen)₂(mipc)]²⁺(1), [Ru(bpy)₂(mipc)]²⁺ (2) and [Ru(dmb)₂(mipc)]²⁺(3) [mipc?=?2-(6-methyl-3-(1H-imidazo[4, 5-f][1,10]-phenanthroline-2-yl)-4H-chromene-4-one, phen?=?1,10-phenanthroline,bpy?=?2, 2′bipyridine,dmb?=?4, 4′-dimethyl-2, 2′-bipyridine] have been synthesized and characterized by elemental analysis, IR, UV–Vis, ¹H& ¹³C NMR and mass spectra. The DNA-binding properties of the Ruthenium(II) complexes were investigated by spectrophotometric methods, viscosity measurements and light switch studies. These three complexes have been focused on photo activated cleavage studies with pBR-322 and antimicrobial studies. Experimental results indicate that the three complexes intercalate into DNA base pairs and follows the order of 1?>?2?>?3 respectively. Molecular docking studies also support the DNA interactions with complexes through hydrogen bonding and vander Waal’s interactions. Cytotoxicity studies with Hela cell lines has been revealing about anti tumor activity of these complexes.     

Quinoxaline derivatives as corrosion inhibitors for mild steel in hydrochloric acid medium: Electrochemical and quantum chemical studies

The corrosion inhibition potential of four quinoxaline derivatives namely, 1-[3-(4-methylphenyl)-5-(quinoxalin-6-yl)-4,5-dihydropyrazol-1-yl]butan-1-one (Me-4-PQPB), 1-(3-(4-methoxyphenyl)-5-(quinoxalin-6-yl)-4,5-dihydropyrazol-1-yl)butan-1-one (Mt-4-PQPB), 1-[3-(3-methoxyphenyl)-5-(quinoxalin-6-yl)-4,5-dihydropyrazol-1-yl]butan-1-one (Mt-3-PQPB) and 1-[3-(2H-1,3-benzodioxol-5-yl)-5-(quinoxalin-6-yl)-4,5-dihydropyrazol-1-yl]butan-1-one (Oxo-1,3-PQPB) was studied for mild steel corrosion in 1 M HCl solution using electrochemical, spectroscopic techniques and quantum chemical calculations. The results of both potentiodynamic polarization and electrochemical impedance spectroscopic studies revealed that the compounds are mixed-type inhibitors and the order of corrosion inhibition efficiency at 100 ppm is Me-4-PQPB>Mt-3-PQPB>Oxo-1,3-PQPB>Mt-4-PQPB. Fourier transform infrared (FTIR) and ultraviolet–visible (UV–vis) spectroscopic analyses confirmed the presence of chemical interactions between the inhibitors and mild steel surface. The adsorption of the inhibitor molecules on mild steel surface was found to be both physisorption and chemisorption but predominantly chemisorption. The experimental data obey Langmuir adsorption isotherm. Scanning electron microscopy studies revealed the formation of protective films of the inhibitors on mild steel surface. Quantum chemical parameters obtained from density functional theory (DFT) calculations support experimental results.     

‘Guest–host’ effect in liquid crystal mixtures

The most important goal of our research is to show the influence of the ‘guest’ (bent-core mesogen, 1,3-phenyldicarboxylatebis{4-[(4-octylbenzoyl)sulphanyl]phenyl} [IFOS8], banana-shaped liquid crystal [BLC]) on the ‘host’ (calamitic liquid crystal [CLC], (S)-(+)-1-methylheptyloxybiphenyl-(4-n-octylphenyl)thiobenzoate [MHOBS8]), on the stability and the destabilization of the antiferroelectric B2 and the ferroelectric smectic C* (SmC*) phases, and change of the temperature ranges of other phases in the binary liquid crystal mixtures. This work is focused on polymorphism of three new binary liquid crystal mixtures, exhibiting a ‘guest–host’ (guest liquid crystal–host liquid crystal [GH-LC]) effect. MHOBS8 has, among others, a ferroelectric SmC* phase, and IFOS8 assumes the B2 phase with antiferroelectric properties. The observed properties of the mixtures, such as variation of the phase transition temperatures, spontaneous polarization, tilt angle and switching time, are characteristic of a ‘guest–host’ mixture. The influence of BLC on the character of the interactions within the CLC host is discussed, with particular attention paid to electro-optical properties of the GH-LC mixtures.