A series of monometallic complexes (Ru_1–3, Ir_1–3) which have N,O-chelating ligand (pyrazine-2-carboxylate (1), pyridine-2-carboxylate (2), quinoline carboxylate(3) and bimetallic complexes (Ru_4,5, Ir_4,5) bridged by pyrazine-2,3- dicarboxylate (4) and imidazole-4,5-dicarboxylate(5) were synthesized and characterized by ¹H-, ¹³C NMR, FT-IR, and elemental analysis. The crystal structure of Ir₂ was determined by X-ray crystallography. The complexes (Ru_1–5, Ir_1–5) were applied to investigate the electronic and steric effect of ligand in their catalytic activities in transfer hydrogenation and alpha(α)-alkylation reaction of ketones with alcohols. The activities of iridium complexes (Ir_1–5) were much more efficient than ruthenium complexes (Ru_1–5). The highest activity for both reactions was observed for the complex (Ir₂) with pyridine-2-carboxylate. The Ir hydride species was monitored for both reactions.

具有N，O螯合配体的一系列单金属配合物（Ru _1-3，Ir _1-3）（吡嗪-2-羧酸盐（1），吡啶-2-羧酸盐（2），喹啉羧酸盐（3）和双金属合成了吡嗪-2,3-二羧酸盐（4）和咪唑-4,5-二羧酸盐（5 ）桥接的配合物（Ru _4,5，Ir _4,5），并通过¹ H-，¹³ C NMR，FT-进行了表征红外光谱和元素分析，Ir ₂的晶体结构通过X射线晶体学测定，配合物（Ru _1–5，Ir _1-5）用于研究配体在酮与醇的转移氢化和α（α）-烷基化反应中的催化活性中的电子和空间效应。铱配合物（Ir _1-5）的活性比钌配合物（Ru _1-5）有效得多。对于具有吡啶-2-羧酸酯的配合物（Ir ₂），观察到两个反应的最高活性。监测两个反应的氢化铱物质。