density at the metal centre. The complexes undergo oxidative addition (OA) reactions with electrophiles like CH3I and C2H5I to form Ir(III) alkyl species like [Ir(CO)R(P ~ Se)2IX]; [R = CH3 (2), C2H5 (3)] which exhibit ν (CO) bands in the region of 2070 cm−1. Kinetic measurements for the CH3I oxidative addition with complex 1a indicate a first order reaction. The complexes have been characterized by elemental
摘要[[Ir(CO)(P〜Se)2X](1)的一系列卤代
羰基铱(I)配合物(其中P-Se = 1,2-双(
二苯基膦基甲烷硒化物); 通过[Ir(CO)2 X 2]-与
配体Ph 2 PCH 2 P(Se)Ph 2的反应合成了X = Cl(1a),Br(1b),I(1c)}。配合物在1926 cm-1区域显示单个ν(CO)带,与Vaska配合物反式[Ir(CO)Cl(PPh3)2](1965 cm-1)相比,其频率明显更低在
金属中心增强的电子密度。配合物与亲电子体(如
CH3I和
C2H5I)进行氧化加成(OA)反应,形成Ir(III)烷基,如[Ir(CO)R(P〜Se)2IX];[R =
CH3(2),
C2H5(3)]在2070 cm-1的区域内显示ν(CO)带。与配合物1a的 氧化加成反应的动力学测量表明是一级反应。该复合物已经通过元素分析,IR和NMR光谱表征。密度泛函计算表明