which the added electron resides in a relatively nonbonding orbital. Replacement of the tBu group with a phenyl ring leads to a significantly more complicated resonance Raman spectrum, presumably due to coupling with the vibrations of the phenyl ring. Polarization studies demonstrate that the observed modes have A(1) symmetry. In this case, a clearer resonance enhancement of the signals is observed
先前已经针对
金属氮拉伸(nu(M-NR)),NR拉伸(nu(MN-R))以及与末端结合的
酰亚胺相关的可能的
配体变形模式提出了许多要求。在这里,我们研究了单阴离子三齿
配体[PhBP3]([PhBP3] = [PhB(CH2PPh2)3]-)的单核
铁(III)和
钴(III)
亚胺配合物,以阐明这些三价
金属
酰亚胺的振动特征。我们报告[PhBP3] FeNtBu和[PhBP3] CoNtBu的结构。这些类型的伪四面体
金属
酰亚胺表现出较短的键长(约1.65 A)和围绕MNC键的近似线性角度,表明具有多重键特征。此外,这些化合物引起强烈的,低能量的可见吸收。[PhBP3] MNR络合物中光学带的位置和强度均取决于取代基是烷基还是芳基。激发[PhBP3] FeNtBu的低能带会在1104和1233 cm(-1)处产生两个拉曼特征,这两个特征都对15N和2H标记敏感。同位素标记表明1104 cm(-1)模式具有最大的Fe-N拉伸特性,而1233