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

本研究以苏曼烯为配体，合成eta9配位配合物，并将其应用于固氮。苏曼烯的弯曲茚结构被认为在还原4族金属的η 5配位茂金属时具有形成η 9配位络合物的优势。以相应的苏曼烯基阴离子为原料合成了单核和三核的苏曼烯基茂金属配合物。用还原剂处理得到的单核茂锆配合物，并研究其固氮作用。虽然没有确定的产品，这项工作被认为是有助于eta9协调配合物的形成和其应用固氮。

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.