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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Kinetics and mechanism of the reactions of Pd(II) complexes with azoles and diazines. Crystal structure of [Pd(bpma)(H2O)](ClO4)(2)center dot 2H(2)O
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Kinetics and mechanism of the reactions of Pd(II) complexes with azoles and diazines. Crystal structure of [Pd(bpma)(H2O)](ClO4)(2)center dot 2H(2)O

机译:Pd(II)配合物与吡咯和二嗪反应的动力学和机理。 [Pd(bpma)(H2O)](ClO4)(2)中心点2H(2)O的晶体结构

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Substitution reactions of the complexes [Pd(bpma)(H2O)](2+), [Pd(bpma)Cl](+), [Pd(dien)(H2O)](2+) and [Pd(dien)Cl](+), where bpma = bis(2-pyridylmethyl)amine and dien = diethylentriamine or 1,5-diamino-3-azapentane, with some nitrogen-donor ligands such as triazole, pyrazole, pyrimidine, pyrazine and pyridazine, were studied in an aqueous 0.10 M NaClO4 at pH 2.8 using variable-temperature and -pressure stopped-flow spectrophotometry. The second-order rate constants indicate that the Pd(II) complexes of bpma, viz. [Pd(bpma)(H2O)](2+) and [Pd(bpma)Cl](+), are more reactive than the complexes of dien, viz. [ Pd( dien)( H2O)] 2+ and [ Pd( dien) Cl]+. Also, the aqua complexes, [ Pd( bpma)( H2O)] 2+ and [ Pd( dien)( H2O)] 2+, are much more reactive than the corresponding chloro complexes. The most reactive nucleophile of the five-membered rings is triazole and for the six-membered rings the most reactive one is pyridazine. Activation parameters were determined for all reactions and the negative entropies and volumes of activation (Delta S-double dagger, Delta V-double dagger) support an associative ligand substitution mechanism. The crystal structure of [Pd(bpma)(H2O)](ClO4)(2) center dot 2H2O was determined by X-ray diffraction. Crystals are monoclinic with the space group P21/c. The coordination geometry of [Pd(bpma)(H2O)](2+) is distorted square-planar. The Pd - N (central) bond distance, 1.958(5) angstrom, is shorter than the other two Pd - N distances, 2.007(5) and 2.009(5) angstrom. The Pd - O distance is 2.043(5) angstrom.
机译:配合物[Pd(bpma)(H2O)](2 +),[Pd(bpma)Cl] [+),[Pd(dien)(H2O)](2+)和[Pd(dien)Cl ](+),其中bpma =双(2-吡啶基甲基)胺,dien =二亚乙基三胺或1,5-二氨基-3-氮杂戊烷,并带有一些氮供体配体,例如三唑,吡唑,嘧啶,吡嗪和哒嗪使用可变温度和压力停止流分光光度法在pH 2.8的0.10 M NaClO4水溶液中溶解。二级速率常数表明bpma的Pd(II)络合物,即。 [Pd(bpma)(H2O)](2+)和[Pd(bpma)Cl](+)比dien的络合物更具反应活性。 [Pd(dien)(H2O)] 2+和[Pd(dien)Cl] +。同样,水配合物[Pd(bpma)(H2O)] 2+和[Pd(dien)(H2O)] 2+比相应的氯配合物具有更高的反应性。五元环中反应性最高的亲核试剂是三唑,而六元环中反应性最高的亲核试剂是哒嗪。确定了所有反应的活化参数,并且负熵和活化体积(ΔS-双匕首,ΔV-双匕首)支持缔合配体取代机制。通过X射线衍射确定[Pd(bpma)(H 2 O)](ClO 4)(2)中心点2H 2 O的晶体结构。晶体是单斜晶体,空间群为P21 / c。 [Pd(bpma)(H2O)](2+)的配位几何形状呈扭曲方形。 Pd-N(中心)键距为1.958(5)埃,比其他两个Pd-N距离为2.007(5)和2.009(5)埃短。 Pd-O距离为2.043(5)埃。

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