Cooperative rare earth metal–zinc based heterometallic catalysts for copolymerization of CO<sub>2</sub> and cyclohexene oxide
作者:Jie Qin、Bin Xu、Yong Zhang、Dan Yuan、Yingming Yao
DOI:10.1039/c6gc00511j
日期:——
Significant cooperation was observed in rare earth metal–zinc heterotrinuclear complexes when initiating the copolymerization of CO2 and cyclohexene oxide.
在启动CO2和环己氧化物的共聚反应时,观察到稀土金属-锌杂三核配合物中的显著协同作用。
Synthesis of Heterometallic Rare Earth(
<scp>III</scp>
)–Cobalt(
<scp>II</scp>
) Complexes and Their Application in Alternating Copolymerization of Cyclohexene Oxide and Carbon Dioxide
作者:Yanping Song、Kuan Yin、Yongjie Chen、Bei Zhao、Yong Zhang、Xuehua Zhu、Dan Yuan、Yingming Yao
DOI:10.1002/cjoc.202200656
日期:2023.4
Four heterometallic rareearth(III)-cobalt(II) complexes (rareearth = Y (1), Sm (2), Nd (3), La (4)) stabilized by an o-phenylenediamine-bridged tris(phenolato) ligand (L) have been synthesized and characterized. In these tetranuclear complexes, one polydentate L coordinates to one rareearth(III) ion, and one cobalt(II) ion, respectively, while two rareearth ions are bridged by four acetate groups
四种异金属稀土 (III)-钴 (II) 配合物(稀土 = Y ( 1 )、Sm ( 2 )、Nd ( 3 )、La ( 4 ))由邻苯二胺桥接的三(苯酚)配体稳定(L) 已被合成和表征。在这些四核络合物中,一个多齿 L 分别与一个稀土 (III) 离子和一个钴 (II) 离子配位,而两个稀土离子由四个乙酸基团桥接。这些配合物应用于氧化环己烯和CO 2的共聚反应,显示出良好的活性(TON高达440)和高聚(碳酸环己烯)选择性(>99%)。动力学研究确定方程为速率 = k [CHO] 1[CO 2 ] 0 [引发剂] 1,这证明了引发剂浓度的一级依赖性,并暗示稀土和钴离子在环氧化物开环和链增长中协同作用的协同机制。
Structural and Electronic Behavior of Unprecedented Five-Coordinate Iron(III) and Gallium(III) Complexes with a New Phenol-Rich Electroactive Ligand
作者:Mauricio Lanznaster、Hrant P. Hratchian、Mary Jane Heeg、Lew M. Hryhorczuk、Bruce R. McGarvey、H. Bernhard Schlegel、Claudio N. Verani
DOI:10.1021/ic050809i
日期:2006.2.1
A new asymmetric pentadentate ligand was designed to impose low symmetry to trivalent ions. Five-coordinate Fe3+ and Ga3+ complexes were investigated by crystallographic, electrochemical, and electron paramagnetic resonance methods showing enhanced redox reversibility. Calculations were performed to account for the observed trends.