476629-57-9Relevant academic research and scientific papers
A study of unsaturated pyrazolate-bridged diruthenium carbonyl complexes
Song, Yi-Hwa,Chi, Yun,Chen, Yao-Lun,Liu, Chao-Shiuan,Ching, Wei-Li,Carty, Arthur J.,Peng, Shie-Ming,Lee, Gene-Hsiang
, p. 4735 - 4742 (2002)
The reaction of Ru3(CO)12 with approximately 3 equiv of 3,5-di-tert-butylpyrazole, (dbpz)H, in hexane at 170 °C in a stainless steel autoclave afforded the unsaturated, pyrazolate-bridged diruthenium complex [Ru2(CO)5(dbpz)3] (2). The spectroscopic and structural analysis indicated that this compound contains a vacant coordination site at one axial position trans to the Ru-Ru linkage. This compound reacted with CO at room temperature to give the saturated complex [Ru2(CO)6(dbpz)2] (1b); its structure is analogous to that of the previously determined complexes [Ru2(CO6(pz)2], pz = pyrazolate and 3,5-dimethyl pyrazolate, except that the equatorial CO ligands show a skew arrangement, an indication of steric constraints within the coordination sphere. Treatment of 2 with benzyl isocyanide or with pyridine in toluene leads to the formation of substitution products [Ru2(CO)4(L)(dbpz)2], L = CNCH2Ph and pyridine, in which the incoming donor ligand occupies an equatorial position at the saturated Ru center. The structural significance of this pyrazolate-bridged diruthenium complex 2 is discussed.
