Sur la stabilité thermique des étalonsanalytiques。八
摘要:
恢复 Nous avons trace la courbe de thermolyse et donne le spectre d'absorption infrarouge sursolide,de douze 物质 pouvant serivir comme 标准具。L'acetate de plomb, le chlorure de mg, len nitate de Cobal(II) et le Sure de sodium ne peuvent etre peses directement pour confectionner une liqueur titree。
Although considerable studies on pursuing high-performance Pd-based catalysts for the semihydrogenation of alkynes have been carried out, the creation of catalyst with high activity, selectivity and stability simultaneously toward semihydrogenation reactions remains a significant challenge. Herein, for the first time we report a facile synthetic strategy to realize the intermetallic Pd–Pb nanocubes
尽管已经进行了大量的研究,以寻求用于炔烃半氢化的高性能Pd基催化剂,但同时制备对半氢化反应具有高活性,选择性和稳定性的催化剂仍然是一项重大挑战。在此,我们首次报道了一种通过简单地利用小分子来实现具有不同凹度的金属间Pd-Pb纳米立方的简便合成策略。这些获得的Pd-Pb纳米晶体在炔烃的半氢化反应中表现出很高的活性,其性能高度依赖于形状和成分,而Pd-Pb凹形纳米立方体的最佳烯烃选择性为94.6%,活性为179.2 h –1,远远高于10%Pd / C。详细的X射线光电子能谱结果表明,较高比例的金属Pd导致苯乙炔的半加氢活性较高,较高比例的Pb 2+和Pb / Pd有助于较高的苯乙烯选择性。密度泛函理论计算进一步表明,苯乙炔在Pd 3 Pb表面上的良好吸附能和所需的苯乙烯解吸能对于苯乙炔半氢化反应具有至关重要的活性和高选择性。此外,Pd-Pb凹形纳米立方体可以承受至少五个循环,且转化率和选择性
Permetalloplumbanes: Preparation of [Pb{Co(CO)3(L)}4] and [Pb{Fe(CO)2(NO)(L)}4].
作者:Paul Hackett、A.R. Manning
DOI:10.1016/s0277-5387(00)81066-9
日期:1982.1
The sole and unexpected products from the reactions of a variety of lead (II) and lead (IV) compounds with [Co2(CO)6(L)2] complexes (L = tertiary arsine, phosphine, or phosphite) in refluxing benzene solution are the blue, air-stable percobaltoplumbanes [PbCo(CO)3(L)}4]. These have also been obtained from the reaction of Na[Co(CO)3(L)] (L PBu3n) with lead (II) acetate which with Na[Fe(CO)2(NO)(L)]
Thermal decomposition of carbonates, carboxylates, oxalates, acetates, formates, and hydroxides
作者:Jacob Mu、D.D. Perlmutter
DOI:10.1016/0040-6031(81)80175-x
日期:1981.11
Abstract A study is reported of the controlled decomposition of various metal carbonates, carboxylates, oxalates, acetates, formates and hydroxides and their common hydrates, carried out in a thermogravimetric analyzer, a differential scanning calorimeter, and a differential thermal analyzer. Various sample sizes, heating rates, and ambient atmospheres were used to demonstrate their influence on the
Synthesis and Structure of Lead(II) Complexes of (η
<sup>6</sup>
‐Benzenecarboxylato)tricarbonylchromium
作者:Balasubramanian Murugesapandian、Peter W. Roesky
DOI:10.1002/ejic.201100948
日期:2012.1
Treatment of (η6-benzoic acid)tricarbonylchromium withlead(II) acetate in the presence of trans-1,2-bis(4-pyridyl)ethene (bpe) afforded the one-dimensional coordination polymer [Pb(η6-C6H5COO)Cr(CO)3}2bpe]n (1). In contrast, the reaction of (η6-benzoic acid)tricarbonylchromium with lead(II) acetate in the presence of 1,10-phenanthroline (1,10-phen) or 2,2′-bipyridine (2,2′-bipy) gave the lead(II)
在反式-1,2-双(4-吡啶基)乙烯(bpe)存在下用乙酸铅(II)处理(η6-苯甲酸)三羰基铬得到一维配位聚合物[Pb(η6-C6H5COO)Cr (CO)3}2bpe]n (1)。相比之下,(η6-苯甲酸)三羰基铬与乙酸铅 (II) 在 1,10-菲咯啉 (1,10-phen) 或 2,2'-联吡啶 (2,2'-bipy) 存在下的反应得到铅(II)化合物[Pb(η6-C6H5COO)Cr(CO)3}2(1,10-phen)](2)和[Pb(η6-C6H5COO)Cr(CO)3}2( 2,2'-bipy)] (3)。所有化合物的固态结构均通过单晶 X 射线衍射确定。
Benzoyl Halides as Alternative Precursors for the Colloidal Synthesis of Lead-Based Halide Perovskite Nanocrystals
作者:Muhammad Imran、Vincenzo Caligiuri、Mengjiao Wang、Luca Goldoni、Mirko Prato、Roman Krahne、Luca De Trizio、Liberato Manna
DOI:10.1021/jacs.7b13477
日期:2018.2.21
this issue, we show here that benzoyl halides can be efficiently used as halide sources to be injected in a solution of metal cations (mainly in the form of metal carboxylates) for the synthesis of APbX3 NCs (in which A = Cs+, CH3NH3+, or CH(NH2)2+). In this way, it is possible to independently tune the amount of both cations and halide precursors in the synthesis. The APbX3 NCs that were prepared with