成丽君,廖骞.NNN型配体及其钨卡宾配合物合成[J].,2022,62(2):111-116 |
NNN型配体及其钨卡宾配合物合成 |
Synthesis of NNN-type ligand and its tungsten carbene complex |
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DOI:10.7511/dllgxb202202001 |
中文关键词:钨卡宾配合物钳形配体三苯基氯甲烷配位反应 |
英文关键词:tungsten carbene complexpincer ligandtriphenylchloromethanecoordination reaction |
基金项目:国家自然科学基金资助项目(21702024). |
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中文摘要: |
将4,4′-二甲基二苯胺依次经硝化和还原后,合成了双(4-甲基-2-氨基苯基)胺.此化合物与三苯基氯甲烷进行N 烷基化反应,高产率地得到了一种新的氨基-NNN钳形配体2,2′-二(三苯甲基氨基)-4,4′-二甲基二苯胺.该配体在空气中稳定,且能与(t-BuO)3W≡CPh反应形成一种新型的钨卡宾配合物.通过核磁共振、X-射线单晶衍射等方法对该卡宾配合物研究发现,配体的3个N原子并未全部参与配位,而是有1个N原子取代基上的苯环参与了配位.通过DFT计算,发现NNC型配合物比NNN型配合物能量更低. |
英文摘要: |
Bis(4-methyl-2-aminophenyl)amine was synthesized by nitration and reduction of 4,4′-dimethyldiphenylamine. After N-alkylation of this compound with triphenylchloromethane, a new amino NNN-pincer ligand, 2,2′-bis(triphenylmethylamino)-4,4′-dimethyldiphenylamine was obtained in high yield. This ligand is stable in air and can coordinate with (t-BuO)3W≡CPh to form a new tungsten carbene complex. The NMR and X-ray single crystal diffraction show that not all the three N atoms of the ligand coordinate to the metal, but the benzene of one N atom′s substituent coordinates. DFT calculation proves that the energy of NNC-type complex is lower than the energy of NNN-type complex. |
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