Construction of functional coordination polymers derived from designed flexible bis(4-carboxybenzyl)amine
作者:Xiutang Zhang、Hongtai Chen、Bin Li、Guangzeng Liu、Xinzheng Liu
DOI:10.1039/c8ce01418c
日期:——
Four coordinationpolymers (CPs), [Zn2(H2BCA)2(o-bimb)2(H2O)2]n (1), [Pb(H2BCA)(p-bib)0.5]·H2O}n (2), [Cd2(H2BCA)2(p-bib)2]·(H2O)3}n (3) and [Zn(H2BCA)(m-bib)]·H2O}n (4), have been derived from the designed flexible bis(4-carboxybenzyl)amine (H2BCA) with bis(imidazole) linkers (p-bib = 1,1′-benzene-1,4-diylbis(1H-imidazole), m-bib = 1,3-bis(1-imidazoly)benzene, and o-bimb = 1,2-bis(imidazol-1-ylmethyl)
N,N'-alkenylene amine/mercaptotolyl-imidazole blends as high temperature antioxidants for elastomers
申请人:CIBA-GEIGY AG
公开号:EP0585202A1
公开(公告)日:1994-03-02
Elastomers are very effectively stabilized against thermal and oxidative degradation at elevated temperatures with a blend of an N,N,N',N'-tetrasubstituted 1,4-diamino-2-butene, where the substituents are alkyl, cycloalkyl, aralkyl, aryl or mixtures thereof, in combination with a mercaptoimidazole of formula IV
where E is hydrogen, alkyl, cycloalkyl, aryl or phenylalkyl.
methods due to the high activity of these functional groups. We report a crystal-engineering strategy for such metal–organicframeworks. Reactions of Zn(II) ion with diversified coordination modes and bis(4-carboxy-benzyl)amine (H2bcba) with a secondary aliphatic amine bridge at different temperatures yielded a pair of isomeric frameworks with very similar framework structures but distinctly different local
P21/n while complex 2 belongs to triclinic system with space group Pī. Complex 1 is 1D coordinationpolymers while complex 2 is 2D coordinationpolymers. Hirshfeld surface analysis of 1 and 2 were investigated and discussed in detail. Moreover, Magnetic studies reveal that complex 2 displays dominant antiferromagnetic interactions between MnII ions through syn-syn-carboxyl bridges.
两种新的配位聚合物 [Cu( L )(phen)] n ( 1 ) 和 [Mn 2 ( L ) 2 (phen) 2 ]⋅H 2 O} n ( 2 , H 2 L为 4,4'-(氮杂二(亚甲基))二苯甲酸,苯为邻-菲咯啉)采用水热法合成。配合物1和2通过粉末 XRD、FT-IR、元素分析、热重分析和 X 射线单晶衍射表征。配合物1属于单斜晶系,空间群为P 21 / Ñ而复杂2属于空间群三斜晶系P ī。配合物1是一维配位聚合物,而配合物2是二维配位聚合物。对1和2 的Hirshfeld 表面分析进行了详细研究和讨论。此外,磁性研究表明,配合物2通过Syn-syn-羧基桥在 Mn II离子之间显示出主要的反铁磁相互作用。
Coordination cage with structural “defects” and open metal sites catalyzes selective oxidation of primary alcohols
by this unique inner cavity environment, promising catalytic activity toward selectiveoxidation of primary alcohols to carboxylic acids at room temperature is achieved. Mechanistic studies reveal that the coordinatively labile dimetallic Cu(II) sites can efficiently capture and activate the substrate and oxidant to catalyze the reaction, while the confined nano-cavity environment modulates substrate
具有内在酶样活性的配位笼是一类很有前途的催化剂,可用于提高有机反应的效率。我们在此提出了一种可行的策略,可以方便地将多金属活性位点构建成配位笼预先形成的磺酰基杯 [4] 芳烃基四核铜 (II) 前体和氨基官能化二羧酸盐连接体的自组装。笼子呈现出“有缺陷”的、部分开放的圆柱形结构,并具有配位不稳定的双金属 Cu(II) 位点。通过这种独特的内腔环境调制,实现了在室温下将伯醇选择性氧化为羧酸的有前途的催化活性。机理研究表明,配位不稳定的双金属 Cu(II) 位点可以有效地捕获和激活底物和氧化剂以催化反应,而受限纳米腔环境调节底物结合并增强催化转换。