N，N’－双［（1－苯基－3－甲基－5－氧－4－吡唑啉基）亚苄基］乙二亚胺萃取钯的机理及钯－铂体系中钯的选择性萃取

本文首次报道了标题试剂Ｈ２Ａ对钯的萃取行为，确定了萃取物的组成，讨论了萃取机理，算出了萃取平衡常数．通过化学分析、红外及拉曼光谱、紫外光谱，研究得出了萃合物的结构，并且实现了Ｈ２Ａ从钯－铂混合溶液中选择性萃取钯．     

1,10－双(1''－苯基－3''－甲基－5''－氧代吡唑－4''－基)癸二酮－[1,10]与1,10－菲罗啉或2,2''－联吡啶对钴(Ⅱ)的协同萃取行为研究

本文研究了１，１０－双（１＇－苯基－３＇－甲基－５＇－氧代吡唑－４＇－基）癸二酮－［１，１０］（Ｈ２Ａ）与１，１０－菲罗啉（ｐｈｅｎ）或２，２＇－联吡啶（ｄｉｐｙ）对Ｃｏ（Ⅱ）的协同萃取行为。确定了协萃配合物的组成为ＣｏＡ．Ｂ（Ｂ分别为ｐｈｅｎ和ｄｉｐｙ），求得萃取平衡常数ｌｏｇＫｅｘ分别是４．７８（Ｈ２Ａ＋ｐｈｅｎ）和１．６１（Ｈ２Ａ＋ｄｉｐｙ），并对协萃配合物的ＩＲ谱进行了讨论。     

BPMOPP与1，10－菲咯啉对铈的协同萃取

研究了１，２－双（１＇－苯基－３＇－甲基－５＇－氧代吡唑－４＇－基）－１，２－苯二酮（Ｈ＿２Ａ）对盐酸介质中的萃取变价行为及与１，１０菲咯啉（Ｐｈｅｎ）从盐酸及盐酸与甲酸钠缓冲溶液中对的协同萃取行为。斜率法测定协萃合物的组成为ＣｅＡ·ＨＡ·Ｐｈｅｎ，求得了协萃平衡常数，萃取法制得了固态配合物，对其组成、ＵＶ、ＩＲ、￣１ＨＮＭＲ、ＴＧ－ＤＴＡ进行了研究，讨论了协萃机理及萃合物的可能结构。     

伯胺N1923萃取醋酸的研究

研究了伯胺Ｎ１９２３萃取醋酸（ＨＡｃ）的机理．利用对应溶液法确定了萃取平衡，求得平衡常数；辅以饱和法、红外光谱法确认萃合物的组成为Ｎ１９２３·ＨＡｃ，Ｎ１９２３·２ＨＡｃ和Ｎ１９２３·３ＨＡｃ．初步探讨了温度对萃取平衡的影响和进行反萃的条件．     

1，10－双（1＇－苯基－3＇－甲基－5＇－氧代吡唑－4＇－基）癸二酮－［1，10］与1，10－菲罗啉或2，2＇－联吡啶对钴（Ⅱ）的协同萃取行为研究

本文研究了１，１０－双（１＇－苯基－３＇－甲基－５＇－氧代吡唑－４＇－基）癸二酮－［１，１０］（Ｈ２Ａ）与１，１０－菲罗啉（ｐｈｅｎ）或２，２＇－联吡啶（ｄｉｐｙ）对Ｃｏ（Ⅱ）的协同萃取行为．确定了协萃配合物的组成为ＣｏＡ·Ｂ（Ｂ分别为Ｐｈｅｎ和ｄｉｐｙ），求得萃取平衡常数ｌｏｇＫｅｘ分别是４．７８（Ｈ２Ａ＋ｐｈｅｎ）和１．６１（Ｈ２Ａ＋ｄｉｐｙ），并对协萃配合物的ＩＲ谱进行了讨论．     

三正辛基氧化膦萃取钯的研究

本文研究了用三正辛基氧化膦(TOPO)煤油溶液从盐酸介质中萃取钯及用硫脲反萃钯的条件。用等摩尔系列法、饱和法、化学分析法和斜率法确定了萃合物的组成。用紫外-可见光谱法探讨了TOPO萃取钯的机理。     

1－苯基－3－甲基－4－（a－呋喃甲酰基）－5－吡唑酮与中性萃取剂协同萃取镱的研究

研究了１－苯基３－甲基－４－（呋喃甲酰基）－５－吡唑酮（ＨＡ）萃取镱及其分别与丁基辛基亚砜（ＢＯＳＯ）、戊基已基亚砜（ＰＨＳＯ）、乙基十二烷基亚砜（ＥＤＳＯ）、二苯亚砜（ＤＰＳＯ）和ＴＢＰ协同萃取镱的行为。协萃配合物的组成为ＹｂＡ＿３·Ｂ，ＨＡ的萃取平衡常数为—５．６４±０．０４，中性萃取剂的协萃能力比单独萃取时高３～４个数量级，协萃效果明显。     

苯基硫脲—磷酸三丁酯二元中性体系对钯的协同萃取研究

本文研究了苯基硫脲－磷酸三丁酯组成的二元中性体系在ＨＣｌ介质中Ｐｄ（ＩＩ）的萃取行为，发现该体系有明显的协同萃取效应。实验证明：在０．５－６ｍｏｌ／Ｌ ＨＣｌ介质中，该体系能定量萃取Ｐｄ（ＩＩ）。文中研究了萃取的最佳条件，试验了反萃取条件及共存离子对Ｐｄ（ＩＩ）萃取的影响。用斜率法测得萃合物的组成为Ｐｄ：ＰＴＵ：ＰＴＢ＝１：２：２，采用电子吸收光谱及红外光谱对协萃机理及萃合物的结构作了探讨。     

双（十二烷基亚磺酰）乙烷溶剂萃取钯及其机理的研究

本文研究用双（十二烷基亚磺酰）乙烷萃取钯的性能，在ＫＩ存在下从７ｍｏｌ／Ｌ盐酸介质中用含有ＢＤＳＥ的氯仿能定量萃取钯，有机的钯可被硫脲或氨溶液反萃继之用ＴＭＫ－ＴｒｉｔｏｎＸ－１００光度法测定，研究了萃取的最佳条件及干扰情况，斜率法测得萃合物组成为Ｐｄ：Ｉ：ＢＤＳＥ＝１：２：１，红外光谱证实萃合物中ＢＤＳＥ的二个亚砜以硫原子与钯配位，萃合物为异位体络合物，提出了选择性萃取分离钯的新方法。     

二（2，4，4－三甲基戊基）膦酸从盐酸介质中萃取钍（Ⅳ）的机理

研究了二（２，４，４－三甲基戊基）膦酸（ＢＴＭＰＰＡ，ＨＡ）的正辛烷溶液从盐酸介质中萃取钍（Ⅳ）的机理。在未控制离子强度下，萃取平衡反应为：，在控制离子强度为１．０ｍｏｌ／Ｌ时，萃取反应为用饱和法确定的萃合物组成为ＴｈＣＩＡ＿３．计算了萃取反应的平衡常数及热力学函数。研究了饱和萃合物的ＩＲ和ＮＭＲ谱。     

THEORETICAL INVESTIGATION OF KETENE BONDING MODES IN BIS(PHOSPHINE) PALLADIUM KETENE COMPLEXES

Abstract

Theoretical studies were carried out on a series of bis(phosphine) palladium ketene complexes (PR₃)₂Pd(CH₂=C=O), and on the related CH₂=C=O and Pd(PR₃)₂ molecular fragments in order to investigate the electronic structure and the bonding of the ketene ligand to the metal fragment in these complexes. An analysis of the frontier MOs has been performed in order to understand the interactions between the ketene and the metal fragments. The calculated results have shown that the η²-(C,C) mode is preferred over the η²-(C,O) mode by 10–15 kcal/mol in bis(phosphine) palladium ketene complexes. The basicity and bulkiness of the phosphine ligands PR₃ have little effect on the bonding mode in (PR₃)₂Pd(CH₂=C=O) complexes. The most stable structure was calculated to be the η²-(C,C) square planar geometry with the CH₂ group of ketene out of the molecular plane. Comparison and discussion between the two bonding modes were also presented in this paper.     

HYDROGENATION OF PHENOL AND CRESOLS CATALYZED BY CHITOSAN SUPPORTED PALLADIUM COMPLEX AT MILD CONDITIONS

A natural polymer catalyst, sillca-supported chitosan palladium complex (abbr. asSiO_2-CS-Pd) was found to catalyze the hydrogenation of phenol and cresols to correspond-ing cyclohexanones in high yield and 100% selectivity at 70℃ and 1.01325×10~5 Pa mildconditions. N/Pd molar ratio in the complex, temperature and solvents have much infiuenceon the reaction. The reactivity order of reactants was found to be: phenol >m->p->o-cresol. The catalyst is stable during the reaction and could be repeatedly used for severaltimes without much decrease in its catalytic activity.     

SYNTHESIS AND MESOMORPHIC PROPERTIES OF PALLADIUM CHELATES OF LIQUID CRYSTAL POLYSILOXANE WITH β-DIKETONE-BASED SIDE CHAINS

A new type of palladium chelate of β-diketone-based side chain liquid crystal polysiloxane (Pd-DKLCP) has been synthesized by chelation reaction of palladium dichloride with polymeric ligand, β-diketone polysiloxane (DKLCP), using THF as solvent at R.T.. The Pd-chelation results in greatly increasing the phase transition temperature T_K and the enthalpy change △H_K from crystal to liquid crystal state and making the temperature range of LC state △T(△T=T_(Cl)-T_K) widened. All these chelates Pd-DKLCP's do not show T_(Cl) until decomposition at 205℃. It is noteworthy that the Pd-chelation can exert more positive effect on the mesomorphic behaviour of the polymer ligand than the counterpart Cu-DKLCP does. It is probable due to the bigger size of disc-like mesogen formed from β-diketone and Pd~(+2) ion with 4d orbital.     

PALLADIUM DIHALIDE COMPLEXES WITH D,L-ETHIONINE

Abstract

By reaction of palladium halides with D,L-ethionine (D,L-EthH; molar ratio 1:1) in dichloromethane solutions containing an excess of 2,6-dimethyl-4H-pyran-4-one (DMP) [Pd(D,L-EthH)X₂] (X?Cl, Br or I) complexes have been isolated. When the solvent was benzene [Pd(D,L-EthH)X₂].DMP adducts were obtained in which the DMP molecule does not bind to the metal. The complexes have been characterized by infrared and nmr (¹H and ¹³C) spectroscopy and by thermogravimetric measurements (TG, DTG and DTA). The importance of DMP in determining the reaction course is discussed.     

A 31P NMR STUDY OF TERTIARY PHOSPHINE COMPLEXES OF PLATINUM(II) AND PALLADIUM(II)

Complexes of the type NBu ₄ MCl ₃ PR ₃ R=P.Tolyl,Ph,Bu) (M = Pt, Pd) are prepared by the reaction of MCl ₂ or K ₂ [MCl ₄ ] by phosphine ligands. Addition of NBu ₄ Br or NBu ₄ I to these compounds, in dichloromethane results in a redistribution of halogens and formation of all six isomers of the type MBr _{3 ?X}Cl_XPR ₃ X= 0, 1, 2, and 3 which have been identified by ³¹ P- ¹ H NMR spectroscopy. The intensities show that the products are proportional to the statistical distribution.     

N,N（二甲庚基）乙酰胺萃钯机理研究

本文研究了N,N二甲庚基乙酰胺(N_(s03))从氯化物体系中萃取钯的机理。应用等摩尔系列法和斜率法确定萃合物组成为:(CH_3CONR_2H)_2PdCl_4。通过紫外-可见光谱法研究,证实N_(503)萃取钯的机理属阴离子交换反应,其萃取方程式为: 2CH_3CONR_2HCl_((o)) PdCl_4~(2-)(a)?(CH_3CONR_2H)_2PdCl_4(o) 2Cl~-(a)     

钯氧化物的电化学与光电子能谱

不少研究者曾分别利用金属钯的表面化学氧化、电化学氧化或喷涂钯氧化物层等方法制备钯氧化物pH电极,已有的工作表明:制备条件对电极的pH响应范围、响应速度和重现性均有明显影响。因此,在继续寻找最佳制备条件的同时有必要对决定电极性能的因素进行深入的研究.本文旨在通过比较由两种方法制得的钯氧化物电极的组成和伏安行为,探讨影响电极pH敏感性能的因素。     

β羟肟萃取钯(Ⅱ)取代反应中的动力学催化作用

β羟肟、硫醚等在盐酸介质中萃取钯(Ⅱ)的配位取代反应具有较高的选择性,有实用意义^[1-5]。Cleare等^[1]曾提出加入胺类化合物以加快β羟肟萃钯的速度。本文在研究β羟肟萃钯(Ⅱ)机理^[2,3]的基础上考察了加入伯胺后2-羟基-4-(1-甲基庚氧基)二苯甲酮肟(HL)萃取钯(Ⅱ)的热力学和动力学行为以及界面特性,试图阐明伯胺对该取代反应的加速机理。试验所用伯胺N1923(Am)为混合支链伯胺,上海有机所实验厂生产。水相中伯胺含量用溴酚兰分光光度法测定^[6],其它实验方法参见[3]。     

REACTIONS OF TRIMETHYL GROUP IVA HALIDES (Si,Ge, Sn) WITH PHOSPHINE-BRIDGED PALLADIUM,PLATINUM, AND SILVER DIMERS

Abstract

Reactions of a series of binuclear, phosphine bridged late transition metal complexes, Pd₂Cl₂(dppm)₂, Pd₂Cl₂(dmpm)₂, Pd₂Cl₂(Ph₂Ppy)₂, Pt₂Cl₂(dppm)₂, and Ag₂Br₂(dppm)₂, with Me₃SiX (X = Br, I), Me₃GeBr and Me₃SnBr were examined by ³¹P NMR spectroscopy. Rapid exchange of Pd-Cl, Pt-Cl and Ag-Br bonds for Pd-X, Pt-X (X = Br, I) and Ag-I bonds was observed to be independent of the nature of the phosphine ligand, the nature of the metal center or the group IV element. Differences in Lewis acidity of the transition metal center as a function of the ligands and the identity of the transition metal and differences in the basicity of the Me₃EBr ligands are proposed to account for the failure to detect intermediates in these reactions similar to those reported for reactions between Pd₂Cl₂(dppm)₂ and Me₃SiX.