Cerium(IV) Carboxylate Photocatalyst for Catalytic Radical Formation from Carboxylic Acids: Decarboxylative Oxygenation of Aliphatic Carboxylic Acids and Lactonization of Aromatic Carboxylic Acids
generated by mixing the precursor Ce(OtBu)4 with the corresponding carboxylicacids served as efficient photocatalysts for the direct formation of carboxyl radicals fromcarboxylicacids under blue light-emitting diodes (blue LEDs) irradiation and air, resulting in catalytic decarboxylative oxygenation of aliphatic carboxylicacids to give C-O bond-forming products such as aldehydes and ketones. Control
Synthesis of four-, five-, and six-coordinate cobalt(iii) bis-o-iminobenzosemiquinone complexes
作者:A. V. Piskunov、K. I. Pashanova、I. V. Ershova、A. S. Bogomyakov、A. G. Starikov、A. V. Cherkasov
DOI:10.1007/s11172-019-2483-6
日期:2019.4
Cobalt(iii) complexes with different 4,6-di-tert-butyl-N-(aryl)-o-iminobenzosemiquinone ligands were synthesized. Four-, five-, or six-coordinate cobalt(iii) derivatives can be prepared using various starting metal compounds (CoCl2•6H2O, (acac)2Co•2H2O) and varying substituents in the N-aryl moiety of the organic ligand. The structures of five synthesized compounds were determined by X-ray diffraction
Preparation method effect on the properties of Ziegler-type hydrogenation catalysts based on bis(acetylacetonato)cobalt
作者:Yu. Yu. Titova、L. B. Belykh、F. K. Shmidt
DOI:10.1134/s0023158416030125
日期:2016.5
and to the concentrations of the initial components. Proton donor compounds have an effect on the catalytic characteristics of the systems. ESR data are presented for the interaction of Co(acac)2 with organometalliccompounds (AlEt3, AlEt2(OEt), Li(n-Bu), and (C6H5CH2)MgCl) in the presence of various arenes. Seven preparationmethods and a formation scheme are suggested for catalytic species that are
报告了基于Al的基于Co(acac)2 · n H 2 O(n = 0、0.5和2)和AlEt 3或AlEt 2(OEt)的齐格勒型系统的发生频率和发生次数。钴的摩尔比与初始组分的浓度有关。质子供体化合物对体系的催化特性有影响。ESR数据显示了Co(acac)2与有机金属化合物(AlEt 3,AlEt 2(OEt),Li(n -Bu)和(C 6 H 5 CH 2)MgCl)在各种芳烃存在下。对于在苯乙烯加氢中具有活性的催化物种,提出了七种制备方法和形成方案,这些催化物种基于Co(acac)2与AlEt 3或AlEt 2(OEt)的结合。
Single-Molecule Magnetism in Three Related {Co<sup>III</sup><sub>2</sub>Dy<sup>III</sup><sub>2</sub>}-Acetylacetonate Complexes with Multiple Relaxation Mechanisms
作者:Stuart K. Langley、Nicholas F. Chilton、Boujemaa Moubaraki、Keith S. Murray
DOI:10.1021/ic400789k
日期:2013.6.17
activated relaxationmechanism may also be active under a zero applied dc field as derived from the Cole–Cole data. Interestingly, these complexes demonstrate further relaxation modes that are strongly dependent upon the application of a static dc magnetic field. Dilution experiments that were performed on 1, in the YIII2CoIII2} diamagnetic analog, show that the slow magnetic relaxation is of a single-ion
三种新的具有[Dy III 2 Co III 2(OMe)2(teaH)2(acac)4(NO 3)2 ](1),[Dy III 2 Co III 2(OH)2(teaH)的化学式2(acac)4(NO 3)2 ]·4H 2 O(2)和[Dy III 2 Co III 2(OMe)2(mdea)2(acac)4(NO3)2 ](3)的特征在于单晶X射线衍射以及dc和ac磁化率测量。这三个复合物均具有相同的“蝴蝶”型金属核,由占据“体”位的两个Dy III离子和占据外部“翼尖”的两个抗磁低旋Co III离子组成。在零每个复数显示单分子磁体(SMM)行为施加的磁场,用热活化的27,28,和38ķ高于7.5ķ各向异性障碍为1 - 3,分别,以及观察的与温度无关的机制1和2低于5 K且3 K低于3 K图3表示磁化的快速量子隧穿(QTM)。从Cole-Cole数据得出的第二种更快的热激活弛豫机制也可
Superexchange in linear-chain 2,5-dimethylpyrazinebis(pentane-2,4-dionato)-cobalt(II) and -nickel(II) complexes
作者:Antony B. Blake、William E. Hatfield
DOI:10.1039/dt9780000868
日期:——
The complexes [M(pd)2(2,5Me2-pyz)](pd = MeCOCHOCMe; 2,5Me2-pyz = 2,5-dimethylpyrazine; M = Co, Ni, or Cu) have been prepared and their powder magnetic susceptibilities measured between 1.7 and 70 K. The cobalt and nickel complexes are isomorphous, and all the three complexes probably consist of M(pd)2 units linked axially into infinite chains by bridging 2,5Me2-pyz molecules. The susceptibilities are
已经制备了配合物[M(pd)2(2,5Me 2 -pyz)](pd = MeCOCHOCMe; 2,5Me 2 -pyz = 2,5-二甲基吡嗪; M = Co,Ni或Cu),并且它们的粉末磁化率在1.7和70 K之间测量。钴和镍配合物是同晶的,并且所有三个配合物可能由通过桥接2,5Me 2 -pyz分子轴向连接成无限链的M(pd)2个单元组成。根据链中最近邻居之间的交换相互作用–2 J S i · S j分析磁化率,并使用4 S 2 J获得与数据的良好拟合对于M = Co,Ni和Cu,分别为––1.8±0.2,–1.7±0.1和0±0.1 cm –1。简要讨论了这些值与通过2,5Me 2 -pyz的超交换路径有关的意义。