agreement, and an explanation is proposed. Complexes [Fe(CO)2(PPh3)(C6H8)](7) and [Fe(CO)2(PPh3)(C6H7OMe)](8) both crystallise in the monoclinic space group P21/c with Z= 4. The cell parameters are a= 10.289(4), b= 24.651(10), c= 9.282(4)Å, and β= 109.37(3)° for (7) and a= 14.444(7), b= 18.052(10), c= 9.229(4)Å, and β= 100.57(4)° for (8). The structures were solved by a combination of Patterson and Fourier-difference
η的数4 -cyclohexadiene -
铁(CO)2 η和L 4 -2- methoxycyclohexadiene -
铁(CO)2个大号络合物已经制备和它们的13 C NMR光谱记录下来。甲氧基取代效应表明,随着L的π受体强度降低,二烯Iumo的种群减少,而不是预期的增加的二烯Iumo种群(最低的未占据分子轨道)。L = PPh 3的X射线晶体结构测定是一致的,并提出了解释。配合物[Fe(CO)2(PPh 3)(C 6 H 8)](7)和[Fe(CO)2(PPh 3)(C6 ħ 7 OME)](8)的斜空间群在两个结晶P 2 1 / ç与Ž = 4,晶胞参数一个= 10.289(4), b = 24.651(10), C ^ = 9.282(4)埃,β= 109.37(3)°,(7)和一个= 14.444(7), b = 18.052(10), C ^ = 9.229(4),和β= 100