Crystal structure of Ni(II) complex and fluorescence properties of Zn(II) complex with the Schiff base derived from diethenetriamine and PMBP

The Schiff base, H₂L, was derived from 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) and diethenetriamine. The crystal structure of [NiL(C₂H₅OH)]·H₂O obtained from ethanol solution was determined by X-ray diffraction analysis. The coordination geometry of Ni(II) ion is a distorted octahedron with three oxygen atoms and three nitrogen atoms. Under the excitation of ultraviolet light, strong fluorescence of solid Zn(II) complex was observed. In addition, the fluorescence enhancement was obtained in the presence of Zn²⁺ in THF solution of the ligand, indicating that H₂L may be a potential fluorescent sensor for Zn²⁺.     

Synthesis and Structure of N-（1,5-Dihydro-1-phenyl-3-methyl-4-benzoyl）-3-chloroaniline

1 INTRODUCTION 4-Acyl-5-pyrazolone, a family of flexible b- diketonate, is widely used as extract[1] and well known for its applications as analgesics, antipyre- tics, anti-inflammatory and insecticides[2]. Therefore the study on the derivation of 4-acyl-5-pyrazolone is the focus of many research groups working in the fields of coordination chemistry, biomedicine and pharmaceutical chemistry. In order to study the rela- tionship between the structure and performance of these compounds, w…     

铟（Ⅲ）－PMBP－Ferron极谱络合吸附波研究

在ＨＣｌ－ＮａＡｃ介质（ｐＨ２．５）中，可获得灵敏的Ｉｎ（Ⅲ）－ＰＭＢＰ－Ｆｅｒｒｏｎ极谱络合吸附波，峰电位在－０．６５Ｖ处（ｖｓ·ＳＣＥ），检出限为０．０４ｎｇ／ｍＬＩｎ。峰电流与铟浓度在０．０８～２００ｎｇ／ｍＬ范围内呈线性关系。本法测定工业废水中的痕量铟，结果满意。本文还研究了极谱波的性质和机理。     

Speciation of Fe(III) and Fe(II) in water samples by liquid–liquid extraction combined with low-temperature electrothermal vaporization (ETV) ICP-AES

The use of 1-phenyl-3-methyl-4-benzoylpyrazolone (PMBP) as extractant for separation of Fe(III) and Fe(II) and low-temperature vaporization of the Fe(III)–PMBP chelate into ICP-AES for their speciation analysis was investigated. The factors affecting the formation of Fe(PMBP)₃ chelate and its vaporization behavior were investigated in detail. PMBP was used not only as the extractant for the separation of Fe(III) and Fe(II) but also as the chemical modifier for the low-temperature ETV-ICP-AES determination of iron. Under the optimized conditions, the detection limit for iron(III) and iron(II) are both 3.2?ng/mL, with relative standard deviations of 3.9 and 4.5%, respectively. The proposed method was applied to the determination of trace iron in biological standard reference materials and the species in East Lake water samples, and the results obtained were satisfactory.     

PMBP缩2-萘胺席夫碱及其铜(Ⅱ)配合物的合成与抑菌活性

合成了1-苯基-3-甲基-4-苯甲酰基-吡唑啉酮-5(PMBP)缩2-萘胺席夫碱(HL)及其铜(Ⅱ)配合物,由元素分析、络合滴定法、质谱和摩尔电导值确定配合物的组成为[CuL2],通过核磁共振氢谱、红外光谱、热重谱和液相色谱-质谱联用技术对配体和配合物的结构进行了表征,同时还对目标化合物的抑菌活性进行了初步考察。结果表明:配体和配合物对受试的4个菌种均有不同程度的抑菌活性,抑菌能力配合物强于配体,呈现浓度效应,在浓度为3.0 mg.mL-1时最大直径可达14.9 mm。     

Thermal and spectroscopic studies of scandium complex of 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone

The scandium complexes of Sc(PMBP)₃·H₂O (non-crystal) and Sc(PMBP)₃ (crystal) with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) were prepared and characterized by thermal analysis, IR, NMR and MS spectroscopies. The crystal structure of the complex, obtained by X-ray analysis, indicates that PMBP is a bidentate ligand in the complex and that the Sc atom is six-coordinate and is in a meridional octahedral environment. The order of the ring current effect on the pyrazolone ring is Sc(PMBP)₃ >PMBP(enol)> PMBP(keto).

The metal to ligand stoichiometry was found to be 1:3. The crystalline complex melts at 209 °C, followed by degradation at about 310 °C, with the beginning of decomposition. The enthalpy of melting was found to be 61 kJ/mol. On the other hand, the non-crystalline complex was found to change into a crystalline complex at 176 °C with an exothermic reaction before melting at 217 °C. The IR band observed at approximately, 450 cm⁻¹ is possibly due to the stretching of the Sc–O bond.     

以PMBP为化学改进剂的电热蒸发/ICP-AES测定痕量钪的研究

报道了以１－苯基－３－甲基－４－苯甲酰基－吡唑酮［５］（ＰＭＢＰ）为化学改进剂的ＥＴＶ－ＩＣＰ－ＡＥＳ测定痕量钪的新方法．详细研究了金属螯合物在石墨炉内的形成、挥发及其影响因素；发现过量ＰＭＢＰ的存在有利于该螯合物的形成，并定量蒸发／传输至等离子体中．在优化的实验条件下，钪的检出限为０．３ｎｇ／ｍＬ，相对标准偏差为２．４％（ｃ＝０．１μｇ／ｍＬ，ｎ＝７）．本法已用于标准参考物机动车尾气尘粒中钪的测定，获得了满意的结果．     

Raman spectroscopic verification of fac-Sc(PMBP)3 by solid and solute spectra and density functional method calculation

Two kinds of solids were obtained for Sc(PMBP)₃ by precipitation from different solvents. They were light-yellow crystal and yellowish-white powder, and their melting points were 209 and 217 °C, respectively. Raman spectra of six anhydrous samples prepared from these materials were measured and classified into two types of spectral patterns. Raman solute spectra of these two materials were measured in a dilute solution of dichloromethane, in which the solute is a free molecule in a solvent cage. Their spectra were considerably similar to each other, but they indicated clear differences in some pairs of bands. One of these two molecules was concluded to be a facial form of Sc(PMBP)₃, because the other constituent has been established to be a meridional form of Sc(PMBP)₃ by X-ray analysis of a single crystal. Structural optimization for mer- and fac-Sc(PMBP)₃ and their vibrational calculation of frequencies and intensities were carried out with the density functional method of B3LYP/6-31G**. Their computed Raman spectra were well coincident with their observed spectra. The existence of fac-Sc(PMBP)₃ has been established by thermal analysis, Raman spectroscopy and ab initio calculation.     

Enhanced thermal stability of poly(1,4-dioxan-2-one) in melt by adding a chelator

Thermal stability of poly(p-dioxanone) (PPDO) was investigated isothermally and non-isothermally under air atmosphere using thermogravimetry (TG). The addition of 4-benzoyl-3-methyl-1-phenyl-2-pyrazolin-5-one (PMBP) could enhance successfully the thermal stability of PPDO compared with those of as-prepared and purified PPDO at temperature below about 230 °C. The activation energies for thermal degradation (ΔE_td) were evaluated at different weight loss values from TG data using the procedure recommended by MacCallum et al. The ΔE_td values of as-prepared PPDO, purified PPDO and PPDO containing 1.0 wt% PMBP were in the ranges of 20-50, 35-60, and 56-88 kJ mol⁻¹, respectively, when they were evaluated at weight loss values of 10-80%. The remaining weights increase with the amounts of PMBP added up to 1.5 wt%. The mechanism for the enhanced thermal stability of PPDO was discussed.     

RE（Ⅲ）—HPMBP—TPhPO协萃体系的研究

采用两相滴定法研究HPMBP-TPhPO-甲苯/RE(Ⅲ)-H_2O协萃体系,确定了15个稀土离子在3个温度下的协萃络合物的分子组成及稳定常数。 1 实验部分 1.1 仪器与试剂 821型数字式pH计;501型恒温器;HPMBP(1-苯基-3-甲基-4-苯甲酰基-吡唑啉酮-5,A.R.国产);TPhPO(三苯基氧膦,98％,联邦德国)。 1.2 两相电离常数的测定 等体积已知浓度的HPMBP-甲苯与NaClO_4溶液在隔