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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Manganese coordination chemistry of bis(imino)phenoxide derived [2+2] Schiff-base macrocyclic ligands
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Manganese coordination chemistry of bis(imino)phenoxide derived [2+2] Schiff-base macrocyclic ligands

机译:双(亚氨基)酚盐衍生的[2 + 2]席夫碱大环配体的锰配位化学

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摘要

The [2 + 2] Schiff-base macrocycles [2,2'-(CH2CH2)(C6H4N=CH)(2)-2,6-(4-RC6H2OH)](2) ((IH2)-H-R), upon reaction with MnCl2 (two equivalents) afforded the bimetallic complex [Cl3Mn(mu-Cl) Mn((IH2)-H-Me)] (1) or the salt complex [Cl3Mn(NCMe)][MnCl((IH2)-H-tBu)] (2). Under similar conditions, use of the related [2 + 2] oxy-bridged macrocycle [2,2'-O(C6H4N=CH)(2)-4-RC6H2OH] ((IIH2)-H-R), afforded the bimetallic complexes [(MnCl)(2)IIR] (R = Me 3, tBu 4), whilst the macrocycle derived from 1,2-diaminobenzene and 5,5'-di-tert-butyl-2,2'-di-hydroxy-3,3'-methylenedibenzaldehyde (IIIH4) afforded the complex [(MnCl)(2)(III)]center dot 2MeCN (5 center dot 2MeCN). For comparative studies, the salt complexes [2,6-(ArNHCH)(2)-4-MeC6H2O][MnCl3(NCMe)] (Ar = 2,4-Me2C6H3, 6) and {[(2-ArN=CH), 6-(ArNHCH)-4-Me-C6H2O]MnCl}(2)[MnCl4]center dot 8CH(2)Cl(2) (Ar = 4-MeC6H4, 7 center dot 8CH(2)Cl(2)) were prepared. The crystal structures of 1-7 are reported (synchrotron radiation was necessary for complexes 1, 3 and 5). Complexes 1-7 (not 5) were screened for their potential to act as pre-catalysts for the ring opening polymerization (ROP) of epsilon-caprolactone; 3, 4 and 6, 7 were inactive, whilst 1 and 2 exhibited only poor activity with low conversion (<15%) at temperatures above 60 degrees C.
机译:[2 + 2] Schiff基大环[2,2'-(CH2CH2)(C6H4N = CH)(2)-2,6-(4-RC6H2OH)](2)((IH2)-HR)与MnCl2(2当量)反应得到双金属配合物[Cl3Mn(mu-Cl)Mn((IH2)-H-Me)](1)或盐配合物[Cl3Mn(NCMe)] [MnCl((IH2)-H -tBu)](2)。在相似的条件下,使用相关的[2 + 2]氧桥大环[2,2'-O(C6H4N = CH)(2)-4-RC6H2OH]((IIH2)-HR),得到双金属配合物[ (MnCl)(2)IIR](R = Me 3,tBu 4),而大环衍生自1,2-二氨基苯和5,5'-二叔丁基-2,2'-二羟基-3 ,3′-亚甲基二苯甲醛(IIIH4)得到配合物[(MnCl)(2)(III)]中心点2MeCN(5中心点2MeCN)。为了进行比较研究,盐络合物[2,6-(ArNHCH)(2)-4-MeC6H2O] [MnCl3(NCMe)](Ar = 2,4-Me2C6H3,6)和{[(2-ArN = CH) ,6-(ArNHCH)-4-Me-C6H2O] MnCl}(2)[MnCl4]中心点8CH(2)Cl(2)(Ar = 4-MeC6H4,7中心点8CH(2)Cl(2))准备。报道了1-7的晶体结构(复合物1、3和5需要同步辐射)。筛选了配合物1-7(不是5)作为ε-己内酯开环聚合(ROP)的前催化剂的潜力; 3、4和6、7是不活跃的,而1和2在60摄氏度以上的温度下仅表现出较差的活性,且转化率较低(<15%)。

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