Synthesis of arenetricarbonylchromium(0) complexes, [(η6-arene)Cr(CO)3], has been carried out, wherein arene were benzene (Ph), chlorobenzene (PhCl), phenyltrimethylsilane (PhSiMe3), and acenaphthene (PhNp). Characterization of the compounds was carried out using NMR, IR and UV-visible spectrophotometers. Electronic absorption of these complexeswere measured in various solvents namely methanol, methylene chloride, chloroform, benzene, and isooctane. The complexes showed the electronic absorption of the lowest in the energy range of 313-320 nm, with a relatively high intensity. Density functional theory at the B3LYP/LanL2DZ level of theory was also used to study the geometry parameters, binding energy (BE), vibrational spectra, electronic spectra, frontier molecular orbital (NBO analysis), charge transfer (CT) of the complexes. It was found that the order of the complex stability is: (PhSiMe3)Cr(CO)3> (Ph)Cr(CO)3> (PhNp)Cr(CO)3> (PhCl)Cr(CO)3. The NBO analysis showed that the stability of the complexes arising fromintramolecular interactions and electron delocalization in which synergistic interaction occurs in the arenehyperconjugative orbital ring for metal antibonding orbital and back donation (via metal bonding orbital to bond antibonding orbital ring). The electronic spectrum shows the charge transfer is dominated by ligand to metal charge transfer (LMCT) transition, except for (PhNpe)Cr(CO)3that is dominated by metal to ligand charge transfer (MLCT) and only a small portion is set to d-d transition.
研究人员合成了[(η6-arene)Cr(CO)3]壬羰基
铬(0)络合物,其中的炔是苯(Ph)、
氯苯(PhCl)、苯基三甲基
硅烷(PhSiMe3)和
苊(PhNp)。使用核磁共振、红外和紫外可见分光光度计对这些化合物进行了表征。在
甲醇、
二氯甲烷、
氯仿、苯和
异辛烷等多种溶剂中测量了这些复合物的电子吸收。在 313-320 纳米的能量范围内,这些复合物的电子吸收最低,且强度相对较高。研究还采用了 B3LYP/Lan
L2DZ
水平的密度泛函理论来研究配合物的几何参数、结合能(BE)、振动光谱、电子光谱、前沿分子轨道(NBO 分析)和电荷转移(CT)。NBO 分析表明,络合物的稳定性源于分子内相互作用和电子脱ocalization,其中协同作用发生在
金属反键轨道的炔超共轭轨道环和反向捐赠(通过
金属键轨道到键反键轨道环)。电子能谱显示,除了 (PhNpe)Cr(CO)3 以
金属到
配体的电荷转移(MLCT)为主外,电荷转移主要是
配体到
金属的电荷转移(L
MCT)转变,只有一小部分是 d-d 转变。