Creation of low-valent complex catalyst with bowl-shaped "eta9 ligand" and its application to nitrogen fixation

本研究旨在利用苏曼烯合成eta9配位络合物，并将其应用于固氮。当4族金属中的eta5配位的茂金属被还原时，Sumanene的弯曲吲哚结构被认为有利于形成eta9配位的配合物。以相应的苏马烯基阴离子为原料，合成了单核和三核苏马烯基茂金属配合物。对得到的单核茂锆络合物进行了还原处理，并考察了其固氮性能。虽然没有鉴定产物，但这项工作被认为有助于eta9配位络合物的形成及其在固氮方面的应用。

This study aimed to synthesize the eta9-coordinated complex using sumanene and its application to nitrogen fixation. The curved indene structure of sumanene is considered to have an advantage to form the eta9-coordinated complex when the eta5-coordinated metallocene of 4-group metals is reduced. The mononuclear and trinuclear sumanenyl metallocene complexes were synthesized from the corresponding sumanenyl anions. The obtained mononuclear zirconocene complex was treated with reductant, and nitrogen fixation was investigated. Although the products were not identified, this work is considered to contribute to the eta9-coordinated complex formation and its application to nitrogen fixation.