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We present CASPT2 calculations of vertical excitation energies for low‐lying singlet and triplet states of auroderivatives of acetylene and ethylene representing small model aurocarbons. Data are supplemented by CCSD(T) results for triplet states. All four considered species, namely linear C2Au2 molecule and three conformers of the C2Au4 molecule—Au2C2Au2 (tetraauroethylene, the analog of the parent...