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|Section2= |Section3= |Section7= |Section8= }} Vaska's complex is the trivial name for the chemical compound ''trans''-chlorocarbonylbis(triphenylphosphine)iridium(I), which has the formula IrCl(CO)()2. This square planar diamagnetic organometallic complex consists of a central iridium atom bound to two mutually ''trans'' triphenylphosphine ligands, carbon monoxide, and a chloride ion. The complex was first reported by J. W. DiLuzio and Lauri Vaska in 1961.〔 〕 Vaska's complex can undergo oxidative addition and is notable for its ability to bind to O2 reversibly. It is a bright yellow crystalline solid. ==Preparation== The synthesis involves heating virtually any iridium chloride salt with triphenylphosphine and a carbon monoxide source. The most popular method uses dimethylformamide (DMF) as a solvent, and sometimes aniline is added to accelerate the reaction. Another popular solvent is 2-methoxyethanol. The reaction is typically conducted under nitrogen. In the synthesis, triphenylphosphine serves as both a ligand and a reductant, and the carbonyl ligand is derived by decomposition of dimethylformamide, probably via a deinsertion of an intermediate Ir-C(O)H species. The following is a possible balanced equation for this complicated reaction.〔Girolami, G.S.; Rauchfuss, T.B.; Angelici, R.J. ''Synthesis and Technique in Inorganic Chemistry'', Third ed.; University Science Books.: Sausalito, 1999, pp190. ISBN 0-935702-48-2.〕 :IrCl3(H2O)3 + 3 P(C6H5)3 + HCON(CH3)2 + C6H5NH2 → IrCl(CO)()2 + ()Cl + OP(C6H5)3 + ()Cl + 2 H2O Typical sources of iridium used in this preparation are IrCl3.''x''H2O and H2IrCl6. 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「Vaska's complex」の詳細全文を読む スポンサード リンク
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