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Raman optical activity spectra of$\Lambda$-tris-(ethylenediamine)-rhodium(III) ([Rh(en)$_3$]$^{3+}$) have beencalculated at 16 on-, near-, and off-resonant wavelengths between 290 nm and800 nm. The resulting spectra are analyzed in detail with a focus on theobserved resonance effects. Since several electronically excited states areinvolved, the spectra are never monosignate, as is often observed in resonanceRaman optical activity spectra. Most normal modes are enhanced through theseresonance effects, but in several cases, de-enhancement effects are found. Themolecular origins of the Raman optical activity intensity for selected normalmodes are established by means of group coupling matrices. In general, thismethodology allows one to produce an intuitive explanation for the intensitybehavior of a given normal mode. However, due to the complex electronicstructure of [Rh(en)$_3$]$^{3+}$, there are some intriguing resonance effectsthe origins of which could not be fully clarified in terms of group couplingeffects. Therefore, simple and general rules that predict how the intensity ofa specific normal mode is affected by resonance effects are difficult todevise.

Resonance Effects in the Raman Optical Activity Spectrum of [Rh(en)$_3$]$^{3+}$