英语翻译In recent years,the application of Schiff base ligands o

英语翻译
In recent years,the application of Schiff base ligands on organometallic chemistry has received considerable attention,
because Schiff base ligands have hard donor-atom
frameworks,good stability and easy modification [1].
Moreover,some of these organometallic complexes are
known to serve as precatalysts in homogeneous catalysis
[2].Schiff base contains a reactive imine functional group
that is prone to nucleophilic attack.It is well known that
alkali metals can promote the reductive coupling of imino
functional groups in transition metal Schiff base complexes,
and the new dimeric polyanionic ancillary ligands can be
formed [3].However,similar coupling reaction is rare in
organolanthanide chemistry.Gambarotta et al.obtained
a dimeric samarium(III) complex arising from the reductive
C–C coupling of two imine groups of two Schiff base ligands during reduction of tetradentate Schiff base
(salen-type) samarium(III) chloride with metallic lithium
[4].Here we reported the synthesis and characterization
of a novel trivalent samarium complex (2),in which three Schiff base ligands were trimerized to form the new ligand L by the reductive coupling reactions of imine groups.Furthermore,the coupling reaction of imine group of Schiff base ligand with
C=N bond of quinoline ring is first reported.
Reaction of anhydrous SmCl3 with 2 equiv.of the
sodium salt of the tridentate Schiff base formed in situ by
the reaction of A with NaH in THF,after workup,afforded the
samarium Schiff base chloride SmL2Cl(THF) (1) in good
isolated yield (Scheme 1) [5].The composition of complex
1 is confirmed by elemental analysis,and there are the characteristic absorption bands of imine groups in the IR
spectrum.
Because reduction of trivalent lanthanide complexes by
alkali metals is a popular method for the synthesis ofdivalent lanthanide complexes,we intend to synthesize the
divalent samarium Schiff base complex via reduction of
complex 1 with sodium,but the attempts were unsuccessful.
Complex 1 reacted with sodium in THF smoothly,and a deep red,air-sensitive solution formed.Dark-red crystals were isolated in reasonable yield upon crystallization from DME (Scheme 1),which was identified to be a novel trivalent samarium complex (2) by elemental analysis,and X-ray crystal structure determination [6,7].
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近年来,希夫基本的配合基的应用在有机金属的化学的受到了可观的注意,
because希夫基本的配合基有坚硬捐款人原子
frameworks、好稳定和容易的修改[1].
Moreover,其中一些有机金属的复合体是担当的known在同类的催化的precatalysts
[2].希夫基地包含一个易反应的亚胺功能小组
that是有倾向的对亲核攻击.是知名的
alkali金属可能促进与减少有关的联结亚氨基在过渡金属希夫基底杂岩的functional小组,
and新的由两部分组成的polyanionic辅助配合基可以是
formed [3].然而,相似的偶联反应是罕见的
organolanthanide化学.等获得的Gambarotta
a由两部分组成的钐(III)复杂出现从与减少有关二个亚胺小组C–C联结二个希夫基本的配合基在tetradentate希夫基地的减少时
(salen类型)钐(III)与金属锂的氯化物
[4].在这儿我们报告了综合和描述特性
of新颖的三价钐复合体(2),三个希夫基本的配合基由亚胺的与减少有关的偶联反应trimerized形成新的配合基L编组.此外,亚胺小组的偶联反应希夫基本的配合基与喹啉圆环C=N债券首先报告.无水SmCl3的Reaction与2的等效.有三齿希夫基地的sodium盐在原处形成了 A的the反应与NaH的在THF,在检查以后,买得起
samarium希夫基本的氯化物SmL2Cl (THF) (1)在好
isolated出产量(计划1) [5].复合体的构成
1由元素分析证实,并且有亚胺小组典型吸收带宽在红外线的
spectrum.三价镧系元素复合体的Because减少
alkali金属是综合ofdivalent镧系元素复合体的一个普遍的方法,我们意欲综合
divalent钐希夫基底杂岩通过减少 与钠的complex 1,但是尝试是不成功的.
Complex 1顺利地起了反应与在THF的钠和被形成的一种深红,空气敏感解答.深红水晶在结晶的合理的出产量被隔绝了从DME (计划1),是由元素分析确定的是新颖的三价钐复合体(2)和X-射线晶体结构决心[6,7].