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| Section2 = | Section3 = | Section7 = | Section8 = }} Pentamethylcyclopentadienyl ruthenium dichloride is an organoruthenium chemistry with the formula ()2, commonly abbreviated ()2. This brown paramagnetic solid is a reagent in organometallic chemistry. It is a very unusual example of a compound that exists as isomers that differ in the intermetallic separation, a difference that is manifested in a number of physical properties. ==Preparation, structure, reactions== The compound has C2h symmetry. Each metal is pseudo-octahedral. Two isomers are observed in the unit cell, one with an Ru-Ru bond (2.93 Å) and one with a long internuclear distance of 3.75Å. The former isomer is thought to be diamagnetic, and the latter is magnetic.〔McGrady, John E. "(): bond-stretch or spin-state isomerism?" Angewandte Chemie, International Edition (2000), volume 39, p. 3077-3079. 〕 It is prepared by the reaction of hydrated ruthenium trichloride with pentamethylcyclopentadiene.〔Di-μ-Chloro-Bis(Chlororuthenium(III) ), ()2 and Di-μ-methoxo-Bis(η5-Pentamethylcyclopentadienyl)diruthenium(II), ()2" U. Koelle, J. Kossakowski, Inorganic Syntheses 1992, volume 29, 225–228, 〕 :2 Cp *H + 2 RuCl3(H2O)3 → ()2 + 2 HCl + 6 H2O The reaction is accompanied by formation of decamethylruthenocene. Pentamethylcyclopentadienyl ruthenium dichloride can reduced to the diamagnetic tetramer of Ru(II): :2 ()2> + 2 Zn → ()4] + 2 ZnCl2 Methoxide also can be used to produce a related diruthenium(II) derivative, which is also diamagnetic: :()2> + 3 NaOCH3 + HOCH3 → ()2] + 3 NaCl + CH2O + HCl 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pentamethylcyclopentadienyl ruthenium dichloride dimer」の詳細全文を読む スポンサード リンク
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