Variable-temperature solid-state 
   13
 C NMR spectra have been
 recorded for a series of [Cr(η
   6
 -arene)(CO)
   3
 ]
 complexes. In all cases there is evidence for carbonyl exchange in the
 solid state at elevated temperatures. Both the isotropic chemical shifts
 and the chemical shift anisotropies of the 
   13
 CO groups were
 obtained. The relative ease of the carbonyl exchange depended on the extent
 of methyl substitution of the arene ring. It was more facile in those
 complexes with less symmetric arene rings. The single-crystal structure of
 [Cr(η
   6
 -C
   6
 HMe
   5
 )(CO)
   3
 ] was
 determined at 150 K. X-Ray data recorded at room temperature led to a
 misleading structural refinement due to molecular motion.
                                    可变温度固态 13 ℃ NMR 光谱已为一系列 [Cr(Ⅵ 6-arene)(CO)3] 复合物进行记录。在所有情况下,都有证据表明在高温下,碳氧键在固态下发生交换。13 CO 基团的各向同性
化学位移和
化学位移各向异性均已获得。碳氧键交换的相对容易程度取决于
芳烃环甲基取代的程度。在那些
芳烃环不对称性较低的复合物中,碳氧键交换更容易。[Cr(Ⅵ 6-C 6 HMe 5) (CO)3] 的单晶结构在 150 K 下确定。在室温下记录的 X 射线数据由于分子运动而导致了结构精度的误导。