以咪唑并[1,5-a]吡啶結構所合成的同碳雙碳烯之雙金屬錯合物的合成、鑑定以及反應性探討;Synthesis, Characterization and Reactivity of Bimetallic Complex of Imidazo[1,5-a]pyridine based Carbodicarbene

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题名:	以咪唑并[1,5-a]吡啶結構所合成的同碳雙碳烯之雙金屬錯合物的合成、鑑定以及反應性探討;Synthesis, Characterization and Reactivity of Bimetallic Complex of Imidazo[1,5-a]pyridine based Carbodicarbene
作者:	周凱文;Zhou, Kai-Wen
贡献者:	化學學系
关键词:	有機金屬催化
日期:	2022-09-19
上传时间:	2022-10-04 11:01:23 (UTC+8)
出版者:	國立中央大學
摘要:	本實驗室主要發展的為卡本衍生物中的同碳雙碳烯及同碳膦烷碳烯以及它們的金屬錯合物，卡本為中心碳擁有兩對未鍵結電子對，它們是利用強推電子取代基以配位共價鍵與零價碳鍵結，以達到穩定零價碳的作用，是很強的電子贈與配位基，也因為具兩對電子的特性使得其可以與金屬配位形成單、雙金屬錯合物。本論文以咪唑并[1,5-a]吡啶作為起始物，利用本實驗室所開發合成同碳雙碳烯的合成方法，合成出含氮雜環配位基，並可與醋酸鈀反應形成二聚體鈀金屬錯合物，而二聚體鈀金屬錯合物可與不同膦配位基反應形成單體鈀金屬錯合物，後續將單體鈀金屬錯合物進行去質子化形成同碳雙碳烯之鈀金屬錯合物，並利用同碳雙碳烯具有兩對未鍵結電子對之特性成功合成出鈀、金雙金屬錯合物。在有機金屬化學中配位基扮演非常重要的角色，不同電子效應與立體效應的配位基透過鍵結形成金屬錯合物影響中心金屬的活性，進而影響金屬錯合物作為催化劑的反應特性，我們透過X-ray單晶結構數據探討鈀金屬搭配不同的膦配位基的影響，並且將合成的金屬錯合物應用於磺醯化反應中，並探討單、雙金屬錯合物在此反應的催化特性。 ;Our research group is dedicated to the design and synthesis of carbone ligands and their metal complexes. Carbone ligands (L2C) are divalent carbon(0) species with a central carbon atom preserving all its four valence electrons as two lone pairs while flanked by two electron-donor groups (L). Due to their unique bonding situation, carbones are inherently strong electron-donating ligands. In this thesis, Imidazo[1,5-a]pyridine based carbodicarbene palladium complex was synthesized using a synthetic protocol that our research group previously developed. First, the precursor salt of the carbone ligand was synthesized and reacted with palladium (II) acetate, which furnished the salt’s dimeric palladium (II) complex. Then, the dimeric complex reacted with different phosphine ligands to form the monomer palladium (II) complexes. Subsequently, deprotonating the salt′s monomer palladium (II) complexes using a strong base gave the corresponding carbodicarbene palladium (II) complexes with a free lone pair of electrons on the carbone center. Finally, the Pd-Au bimetallic complex was synthesized from the reaction of the carbone palladium (II) complex with PPh3AuNTf2 by accessing the second lone pair electrons of the carbone palladium complex. In organometallic chemistry, ligands play an important role in manipulating the property of a central metal they coordinate with through steric and electronic effects. Consequently, these effects further control the reactivity of metal complexes in catalytic reactions. In this work, we also studied the impact of different phosphine ligands on the metal complex’s catalytic properties toward sulfonylation reaction.
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