1448614-75-2Relevant academic research and scientific papers
Synthesis, structure, and reactivity of lanthanide complexes incorporating indolyl ligands in novel hapticities
Feng, Zhijun,Zhu, Xiancui,Wang, Shaoyin,Wang, Shaowu,Zhou, Shuangliu,Wei, Yun,Zhang, Guangchao,Deng, Baojia,Mu, Xiaolong
, p. 9549 - 9556 (2013/09/12)
The chemistry of interactions of 2-(2,6-diisopropylphenylaminomethylene) indole ligand (1) with europium and ytterbium amides is described. Reaction of 2-(2,6-diisopropylphenylaminomethylene)indole 2-(2,6-i-Pr2C 6H3NHCH2)C8H5NH (1) with europium amide [(Me3Si)2N]3Eu III(μ-Cl)Li(THF)3 afforded a novel europium(II) complex formulated as {[μ-η6:η1:η1-2- (2,6-i-Pr2C6H3N=CH)C8H 5N]Eu[2-(2,6-i-Pr2C6H3N=CH)C 8H5N]}2 (2), having a bridged indolyl ligand in the novel μ-η6:η1:η1 hapticities with the reduction of europium(III) to europium(II) and the oxidation of amino to imino group. Reaction of 2-(2,6- diisopropylphenylaminomethylene)indole 2-(2,6-i-Pr2C 6H3NHCH2)C8H5NH (1) with ytterbium(III) amide [(Me3Si)2N]3Yb III(μ-Cl)Li(THF)3 produced the only deprotonated ytterbium(III) complex formulated as [2-(2,6-i-Pr2C6H 3NCH2)C8H5N]Yb[N(SiMe 3)2](THF)2 (3), having an η1 hapticity indolyl ligand. Reaction of 2 with formamidine [(2,6-Me 2C6H3)NCHNH(C6H3Me 2-2,6)] produced {[μ-η3:η1: η1-2-(2,6-i-Pr2C6H3N=CH)C 8H5N]Eu[(2,6-Me2C6H 3)NCHN(C6H3Me2-2,6)](THF)} 2 (4), which has a bridged indolyl ligand in the novel μ-η3:η1:η1 hapticities, whereas the reaction of 2 with the more sterically bulky formamidine [(2,6-i-Pr 2C6H3)NCHNH(C6H3i-Pr 2-2,6)] afforded complex {[μ-η2:η1: η1-2-(2,6-i-Pr2C6H3N=CH)C 8H5N]Eu[(2,6-i-Pr2C6H 3)N=CHN(C6H3i-Pr2-2,6)](THF)} 2 (5), having the indolyl ligand in the novel μ-η2: η1:η1 hapticities. The results represent the first example of organometallic complexes having indolyl ligands in the novel μ-η6:η1:η1, μ- η3:η1:η1, and μ- η2:η1:η1 bonding modes with metal.
