铽与1—苯基—3—甲基—4—异丁酰基吡唑啉酮—5和中性配体混配配合物…

合成了铽与１－苯基－３－甲基－４－异丁酰基吡唑啉酮和不同中性配体的４个三元配合物Ｔｂ（ＰＭＩＢＰ）３．２Ｈ２Ｏ、Ｔｂ（ｐｍｉｂｐ）３．Ｄｉｐｙ、Ｔｂ（ＰＭＩＢＰ）３、Ｐｈｅｎ和Ｔｂ（ＰＭＩＢＰ）３．２ＴＰＰＯ（Ｄｉｐｙ＝２．２’－联吡啶、Ｐｈｅｎ＝１，１０－邻菲罗啉，ＴＰＰＯ＝三苯基氧膦）。     

铽与1-苯基-3-甲基-4-异丁酰基吡唑啉酮-5和中性配体混配配合物的合成、表征及其荧光性能

合成了铽与１苯基３甲基４异丁酰基吡唑啉酮５（ＨＰＭＩＢＰ）和不同中性配体的４个三元配合物Ｔｂ（ＰＭＩＢＰ）３·２Ｈ２Ｏ、Ｔｂ（ＰＭＩＢＰ）３·Ｄｉｐｙ、Ｔｂ（ＰＭＩＢＰ）３·Ｐｈｅｎ和Ｔｂ（ＰＭＩＢＰ）３·２ＴＰＰＯ（Ｄｉｐｙ＝２２′联吡啶、Ｐｈｅｎ＝１，１０邻菲口罗啉，ＴＰＰＯ＝三苯基氧膦），用元素分析确定了它们的组成，并用紫外可见光谱、红外光谱、差热热重谱对其进行表征。研究它们在固态和溶液中的荧光光谱，并用频域法测定它们在溶液中的荧光寿命。结果表明它们都具有强的绿色荧光和较长的荧光寿命，并且中性配体对铽与１苯基３甲基４异丁酰基吡唑啉酮５配合物的荧光强度有一定的影响，ＴＰＰＯ对其有荧光增强作用，而Ｐｈｅｎ对其有荧光猝灭作用。     

芳香醛与3—甲基—1苯基—5—吡唑啉酮固相缩合反应的研究

研究了芳香醛与３－甲基－１－苯基－５－吡唑啉酮在室温固相、熔融状态及Ｌｅｗｉｓ酸催化下的缩合反应，分别得到４，４＇－甲太－双（３－甲基－１－苯基－５－吡唑啉酮）２－４－芳甲太－３－甲基－１－苯基－５－吡唑啉１．实验表明，在固体状态下，２主要以烯醇式存在，受势时或在溶液中两者可相互转化。     

锑（Ⅲ）－PMBP配合物极谱波的研究

锑（Ⅲ）－ＰＭＢＰ配合物极谱波的研究王曙，吴永强，廖占和（四川轻化工学院化工系６４３０３３）关键词锑，配合物吸附波，１－苯基－３－甲基－４－苯甲酰基吡唑啉酮－５。多种有机试剂可用于锑配合物极谱催化波的测定￣［１－２］。１－苯基－３－甲基－４－苯甲酰基...     

镉（Ⅱ）—1—苯基—3—甲基—4—苯甲酰基—吡唑啉酮—5配合物吸附波的研究

在ＰＨ４．８的ＨＡｃ－ＨＮ４Ａｃ介质中，Ｃｄ（Ⅱ）与１－苯基－３－甲基－４－苯甲酰基－吡唑啉酮－５（ＰＭＢＰ）生成配合物，于－０．６７Ｖ（ｖｓ．ＳＣＥ）出现一尖锐、灵敏的极谱波。镉含量在０．００１－１．０μｇ／ｍＬ范围内与峰高成线性关系。     

锡（Ⅱ）—1—苯基—3—甲基—4—苯甲酰基—吡唑啉酮—5—络合物吸附波的研究

在ｐＨ４．０的ＨＡｃ－ＮａＡｃ缓冲介质中，Ｓｎ（Ⅱ）与１－苯基－３－甲基－４－苯甲酰基－吡唑啉酮－５（ＰＭＢＰ）生成络合物，于－０．７４Ｖ（ｖｓ．ＳＣＥ）出现一灵敏的极谱峰。锡含量在４．２×１０－８ｍｏｌ／Ｌ～３．４×１０－６ｍｏｌ／Ｌ范围内与峰高呈线性关系，检出限为１．７×１０－８ｍｏｌ／Ｌ。用多种电化学方法研究了极谱波的性质及电极反应机理，证明该极谱波为络合吸附波，峰电流由中心离子Ｓｎ（Ⅱ）还原产生，络合物组成为Ｓｎ（Ⅱ）∶ＰＭＢＰ＝１∶１。试验了多种离子对峰电流的影响。方法已用于矿样中痕量锡的测定。     

1,2—双（1‘—苯基—3’—甲基—5‘—氧代吡唑—4’—基）—1,2…

用萃取法合成了１５种１，２－双（１＇－苯基－３＇－甲基－５＇－氧代吡唑－４＇－基）－１，２苯二酮（ＢＰＭＯＰＰ，简作Ｈ２Ｌ）稀土配合物。元素分析确定其化学组成为ＲＥ２Ｌ３·ｎＨ２Ｏ。通过电子光谱、红外光谱、核磁共振谱、热谱、摩尔电导等进行了表征，并讨论了配合物的性质。     

一个新的铀（Ⅵ）三元协萃体系

研究了由４，４＇－癸二酰－双－（１－苯基－３－甲基－５－吡唑啉酮）（ＤＢＰＭＰ，简作Ｈ２Ａ），氧化三辛基膦（ＴＯＰＯ），吡啶（Ｐｙ）组成的三元体系从硝酸溶液中对铀的协同萃取，斜率法确定萃合物组成为ＵＯ２Ａ．ＴＯＰＯ．Ｐｙ，制取了固体协萃配合物，并用元素分析、ＩＲ及ＨＮＭＲ等进行了表征。     

铌（Ⅴ）—1—苯基—3—甲基—4—苯甲酰基—吡唑啉酮—5络合物吸附波的研究

在ｐＨ＝５．０的ＨＡｃＮａＡｃ介质中，Ｎｂ（Ⅴ）与１－苯基－３－甲基－４－苯甲酰基－吡唑啉酮－５（ＰＭＢＰ）生成络合物，于一０．９６Ｖ（ｖｓ．ＳＣＥ）出现一尖极谱波。在滴汞电极上用示波极谱仪或在悬汞电极上则吸附伏安曲线。峰电流与Ｎｂ（Ⅴ）浓度分别在０．００７５－０．８０μｇ／ｍＬ及０．００００７５－０．００７５μｇ／ｍＬ范围内呈线性关系。实验 ３     

2,6—双[（1—苯基—3—甲基—5—氧—4—吡唑啉基）甲酰基]吡啶对铀的液液萃取

研究了新型双β－酮萃取剂２，６－双「（１－苯基－３－甲基－５－氧－４吡唑啉基甲酰基」吡啶的氯仿溶液对铀酰的萃取行为，所得萃合物组成为ＵＯ２（ＨＡ）２。     

铽与1-苯基-3-甲基-4-酰代吡唑啉-5-酮的三元配合物的合成、表征与荧光性能

合成了铽与1-苯基-3-甲基-4-异丁酰基吡唑啉-5-酮(HPMIBP)、1-苯基-3-甲基-4-苯甲酰基吡唑啉-5-酮(HPMBP)的四个三元配合物Tb(PMIBP)3.2H2O(A1), Tb(PMIBP)3.bpy(A2), Tb(PMBP)3.2H2O(B1)和Tb(PMBP)3.bpy(B2)(bpy=2, 2'-联吡啶)。用元素分析确定了它们的组成, 并用紫外-可见光谱、红外光谱、差热-热重谱对其进行了表征。研究了它们在固态和溶液中的荧光光谱, 并用频域法测定了它们在溶液中的荧光寿命, 结果表明A1和A2的荧光强度比相应的B1和B2强三个数量级, A2与A1或B2与B1相比, 荧光强度也有一定程度的增强,并且不同溶剂对其荧光强度和荧光寿命都有较大的影响。     

PMP的酰化反应及其产物萃取性能的研究

合成了9个新1-苯基-3-甲基-5-吡唑酮(PMP)的烷氧基苯酰基衍生物.PMP在不同条件下的酰化研究表明酰氯的量和碱的性质和量对反应方向有很大影响.并用5个C-烷氧基苯酰基PMP衍生物做了萃取La(III)和Y(III)离子的试验,发现1-苯基-3-甲基-4-(3,4,5-三甲氧基)苯甲酰基-4-吡唑酮的萃取性能优于PMBP.     

Ce(Ⅳ)-PMBP配合物的加合物合成及性质的研究

1-苯基-3-甲基-4-苯甲酰基-吡啉酮-5(简称PMBP,本文用A表示)作为金属离子的螯合萃取剂早巳广泛应用,其与稀土离子形成的固态配合物也已报道了几十种,但Ce(Ⅳ)的加合物CeA₄·L(L=Dipy,Phen,Tbpo,Tppo)未见报道,我们合成了上述加合物,对它们作了IR、HNMR、UV和热谱等研究。     

Anionic lanthanide complexes with 3-methyl-4-formyl-1-phenyl-5-pyrazolone

The coordination compounds Na[LnL₄] · 2H₂O and [NBu₄][LnL₄] (Ln = Nd, Sm, Eu, Tb; HL is 3-methyl-4-formyl-1-phenyl-5-pyrazolone) have been synthesized and studied by IR spectroscopy and thermogravimetry. According to X-ray diffraction data, the coordination polyhedra of lanthanides are shaped as square antiprisms and formed by the oxygen atoms of four deprotonated moieties of the enol form of 4-formyl-5-pyrazolone. In the complex Na[EuL₄] · 2H₂O, sodium cations are bonded to the two nitrogen atoms of pyrazole heterocycles, combining discrete complex anions into two interpenetrating three-dimensional frameworks. Polycrystalline samples of neodymium(III), samarium(III), and terbium(III) complexes manifest intense luminescence in the spectral regions that are typical for them.     

Tuning the triplet energy levels of pyrazolone ligands to match the 5D0 level of europium(III)

Three pyrazolone-based ligands, namely 1-phenyl-3-methyl-4-(1-naphthoyl)-5-pyrazolone (HL1), 1-phenyl-3-methyl-4-(4-dimethylaminobenzoyl)-5-pyrazolone (HL2), and 1-phenyl-3-methyl-4-(4-cyanobenzoyl)-5-pyrazolone (HL3), were synthesized by introducing electron-poor or electron-rich aryl substituents at the 4-position of the pyrazolone ring. Their corresponding europium complexes Eu(LX)3(H2O)2 and Eu(LX)3(TPPO)(H2O) (X = 1-3) were characterized by photophysical studies. The characteristic Eu(III) emission of these complexes with at most 9.2 x 10(-3) of fluorescent quantum yield was observed at room temperature. The results show that the modification of ligands tunes the triplet energy levels of three pyrazolone-based ligands to match the 5D0 energy level of Eu3+ properly and improves the energy transfer efficiency from antenna to Eu3+, therefore enhancing the Eu(III) emission intensity. The highest energy transfer efficiency and probability of lanthanide emission of Eu(L1)3(H2O)2 are 35.1% and 2.6%, respectively, which opens up broad prospects for improving luminescent properties of Eu(III) complexes by the modification of ligands. Furthermore, the electroluminescent properties of Eu(L1)3(TPPO)(H2O) were also investigated.     

Solvent extraction of lanthanum(III), europium(III) and lutetium(III) with fluorinated 1-phenyl-3-methyl-4-benzoyl-5-pyrazolones into chloroform

A series of chelating reagents, 1-phenyl-3-methyl-4-(2-fluorobenzoyl)-5-pyrazolone, 1-phenyl-3-methyl-4-(3-fluorobenzoyl)-5-pyrazolone and 1-phenyl-3-methyl-4-(4-fluorobenzoyl)-5-pyrazolone, has been synthesized. The extraction of Ln(III), (Ln = La, Eu and Lu) into chloroform with these reagents at 30 +/- 1 degrees has been studied. The composition of the complexes extracted has been determined by the slope method, and the extraction constants K(ex), were measured. The presence of the fluorine atom in the reagents does not make the K(ex), values much different from those obtained with the parent pyrazolone.     

Solvent extraction of 46Sc with PMBP

Liquid liquid extraction of ⁴⁶Sc was studied with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP). It has been found that PMBP extracts almost quantitatively scandium from 10^-3 to 10^-2M HCl solutions. Tributyl phosphate (TBP) has a pronounced antagonistic effect on the extraction process.     

Catalytic Potential of Pyrazolone Based Dioxidomolybdenum(VI) Complexes for Multicomponent Biginelli Reactions,Epoxidation of Olefins and Oxidative Bromination of Phenol Derivatives

Three different types of dioxidomolybdenum(VI) complexes of 4-acetyl-3-methyl-1-phenyl-5-pyrazolone (Hmp, I )), 3-methyl-1-phenyl-4-propionyl-5-pyrazolone (Hpp, II ), 4-butyryl-3-methyl-1-phenyl-5-pyrazolone (Hbutp, III ), and 4-isobutyryl-3-methyl-1-phenyl-5-pyrazolone (isobutp, IV ) have been isolated and characterized by various spectroscopic (FT-IR, UV/Vis, ¹H and ¹³C NMR) techniques, thermal analysis and single crystal X-ray analysis. These complexes adopt a distorted six-coordinate octahedral geometry where ligands act as bidentate, coordinating through the two O atoms. These complexes have been used as catalysts to explore a single pot multicomponent (benzaldehyde or its derivatives, urea/thiourea and ethyl acetoacetate/phenyl acetoacatate) Biginelli reaction producing biologically active 3,4-dihydropyrimidin-2-(1H)-one and 3,4-dihydropyrimidin-2-(1H)-thione based biomolecules under solvent-free conditions. Presence of H₂O₂ improves the yield of dihydropyrimidin-2-(1H)-one but it acts as poison for the later molecule. Epoxidation of internal and terminal alkenes mainly resulted in the formation of the corresponding epoxide. The catalytic oxidative bromination of thymol, a reaction facilitated by vanadium dependent haloperoxidases, resulted in the formation of three product namely 2-bromothymol, 4-bromothymol and 2,4-bromothymol. Other phenol derivatives have also been brominated effectively.     

Mass spectra of indazolones and pyrazolones—II: 5-pyrazolones

The mass spectral fragmentations of 3-methyl-5-pyrazolone (I), 3-methyl-5-pyrazolone-1-d₁ (II), 3-methyl-5-pyrazolone-1,4,4-d₃ (III), 1-acetyl-3-methyl-5-pyrazolone (IV), 3-methyl-5-ethoxy-pyrazole (V), 3,4-dimethyl-5-pyrazolone (VI), 1,3-dimethyl-5-pyrazolone (VII), 1-acetyl-5-acetoxy-3,4-dimethylpyrazole (VIII), 1,2,3-trimethyl-5-pyrazolone (IX), 3,4,4-trimethyl-5-pyrazolone (X), 3,4,4-trimethyl-5-pyrazolone-1-d₁ (XI), 3-phenyl-5-pyrazolone (XII), 2-acetyl-3-phenyl-5-pyrazolone (XIII) and 5-acetoxy-3-phenylpyrazole (XIV) are reported. Comparison is made between the mass spectra of 5-pyrazolones and 3-indazolones. As for the latter compounds initial loss of ·N₂R is preferred to loss of ·CHO, and is followed by loss of CO. The [M ? 1]ions are intense in the C-methyl substituted pyrazolones, and unlike the 3-indazolones, the pyrazolones do not show any significant loss of HCN from these ions. The mass spectra distinguish between certain isomeric 5-pyrazolones.     

Mass spectrometric studies of some 4-acyl substituted 1-phenyl-3-methyl-5-pyrazolones

The electron-impact-induced fragmentation of 1-phenyl-3-methyl-5-pyrazolone and six 4-acyl substituted derivatives, have been studied with the aid of deuterium labelling, high resolution mass measurements and the metastable defocusing technique. The mass spectra of the pure keto and the pure enol forms do not show any significant differences. The predominant decomposition of the 4-acyl substituted pyrazolones is the α-cleavage with respect to the carbonyl group leading to intense peaks at m/e 201 by loss of the alkyl group. In the case of benzoyl and ethoxycarbonyl derivatives the α-cleavage is associated with a specific hydrogen rearrangement causing the loss of a benzene and an ethyl alcohol molecule, respectively.