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用胺类萃取时,铑以双核的配氯阴离子存在于有机相中,无论用三辛胺,三异辛胺还是N_(1923)萃取时,萃合物的铑氯之比均接近2:9,可用Rh_2Cl_(9~(3-))表示。在此双核配阴离子之中,二个铑原子用三个氯桥相连成,这是一个共面的双八面体,红外光谱中Rh-C1振动峰的分裂证实了这种桥氯键的存在。除了1593cm~(-1)处的Rh-Cl峰之外,在1488cm~(-1)处出现了一个新峰,分裂发生在低频区意味着桥氯键的长度比端氯键长。在类似的双核配氯阴离子如Cr_2Cl_(9~(3-))与W_2Cl_(9~(3-)中,也存在有桥键的伸长。
When amines were extracted, the rhodium was present in the organic phase as binuclear anions, and the ratios of rhodium and chlorine in the extracts were close to 2: 9 when extracted with trioctylamine, triisoctylamine or N_ (1923) , Available Rh_2Cl_ (9 ~ (3-)) said. Among the binuclear anions, the two rhodium atoms are linked by three chlorine bridges, a coplanar double octahedron. The splitting of the Rh-Cl vibrational peak in the infrared spectrum confirms the presence of this bridged chlorine bond. In addition to the Rh-Cl peak at 1593 cm -1, a new peak appeared at 1488 cm -1. The splitting occurred in the low frequency region means that the length of the bridged chlorine bond was longer than that of the terminal chlorine bond. In similar binuclear anions such as Cr_2Cl_ (9 ~ (3-)) and W_2Cl_ (9 ~ (3-), there is also a bridge extension.