Al complexes bearing ketimine ligands was investigated. The catalytic results indicated complexes with more steric hindrance with an electron-withdrawing group on the ligands, or the fact that less chelating ligands demonstrated greater propagation activity. The opposite trend for these structural effects was observed on the measurement of induction periods. These features on ligands of aluminum complexes
Synthesis, characterization, and catalytic activity of sodium ketminiate complexes toward the ring-opening polymerization of <scp>l</scp>-lactide
作者:Wan-Jung Chuang、Yen-Tzu Huang、Yu-Hsieh Chen、Yu-Shan Lin、Wei-Yi Lu、Yi-Chun Lai、Michael Y. Chiang、Sodio C. N. Hsu、Hsuan-Ying Chen
DOI:10.1039/c6ra00373g
日期:——
Studies of the ring-openingpolymerization of L-lactide (LA) using Na complexes with Schiff base ligands as catalysts have revealed high catalyticactivity but poor controllability of the polymer molecular weight. In this study, Na complexes bearing ketiminate ligands instead of Schiff base ligands were synthesized and their application in LA polymerization was tested. The polymerization results revealed
Iron(<scp>ii</scp>) β-ketiminate complexes as mediators of controlled radical polymerisation
作者:Benjamin R. M. Lake、Michael P. Shaver
DOI:10.1039/c6dt01208f
日期:——
β-ketiminate ligands were synthesised via condensation reactions, and complexed with iron(II) using [Fe(N(SiMe3)2)2THF]. The complexation reactions proceeded in high yields to generate novel, monomeric, tetracoordinate iron(II) complexes, each bearing a bis(trimethylsilyl)amide ligand, as confirmed by X-ray crystallography. These complexes were amenable to further reaction (protonolysis) with alcohols and
A Ferromagnetic Interaction between Cu<sup>2+</sup> Centers through a [CrO<sub>4</sub>]<sup>2-</sup> Bridge: Crystal Structures and Magnetic Properties of [{Cu(acpa)}<sub>2</sub>(μ-MO<sub>4</sub>)] (M = Cr, Mo) (Hacpa = <i>N</i>-(1-Acetyl-2-propyridene)(2-pyridylmethyl)amine)
作者:Hiroki Oshio、Toshihiko Kikuchi、Tasuku Ito
DOI:10.1021/ic960204+
日期:1996.1.1
propagated through the [CrO(4)](2)(-) bridge and the coupling constant (2J) was evaluated to be 14.6(1) cm(-)(1) (H = -2JS(1).S(2)). In 2, two copper(II) ions bridged by [MoO(4)](2)(-) anion are antiferromagnetically coupled with the 2J value of -5.1(4) cm(-)(1). The ferromagnetic interaction in 1 is explained by means of the orbitaltopology of frontier orbitals. Crystal data: 1, monoclinic, space group
position of picolyl fragment (−CH2−NH−→−CO−NH−), (ii) dehydrogenation of phenyl substituted Cα (−CH−NH−→−C=N−) and (iii) C−N bond cleavage of the picolinoyl moiety to yield picolinate (−CO−N−−→−CO−O−). Besides structural, spectroscopic (mass, 1H/13C−NMR, EPR, UV‐vis.) and electrochemical authentication of the products, correlation of the reactivity pattern was addressed via transition state (TS) calculations