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1,3-Dimethyl-4-(diphenylphosphino)imidazolium Triflate: A Functionalized Ionic Liquid with Ambivalent Coordination Capability

机译:1,3-二甲基-4-(二苯基膦基)咪唑鎓三氟甲磺酸盐:具有双价配位能力的功能化离子液体

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摘要

Simply using 1-methylimidazole as the starting material, the functionalized ionic liquid 1,3-dimethyl-4-(diphenylphosphino)imidazolium triflate ([3]OTf) has been prepared, from which the corresponding 4-phosphino-substituted N-heterocyclic carbene 4 was generated. The coordination capability of 3 and 4 toward a variety of transition-metal centers has been studied, as well as their electron-donor character through an evaluation of the TEP parameter. 3 behaves as a cationic phosphine ligand, whereas 4 shows a strong preference to coordinate to transition metals through the carbene carbon atom, leading to the obtention of mononuclear complexes with a free phosphine arm which act as metalloligands, allowing for the modular formation of homo- and heterodinuclear transition-metal complexes.
机译:仅以1-甲基咪唑为起始原料,就可以制备官能化的离子液体1,3-二甲基-4-(二苯基膦基)咪唑鎓三氟甲磺酸酯([3] OTf),由此制得相应的4-膦基取代的N-杂环卡宾生成了4个。通过评估TEP参数,研究了3和4对各种过渡金属中心的配位能力,以及它们的电子给体特性。 3表现为阳离子膦配体,而4表现出强烈的偏好,可通过卡宾碳原子与过渡金属进行配位,从而导致单核配合物具有游离的膦化氢臂(起金属配体的作用),从而可形成均聚物。和异核过渡金属配合物。

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