Far-infrared spectra of DCCCN have been recorded from 200 to 365 cm-1 with a 0.04-cm-1 resolution. The following bands and some of their associated hot bands have been analyzed: ν7 ← GS, ν6 ← ν7, ν5 ← ν7, and ν4 ← ν6. Combining these results with microwave and available Stark data, we have performed a first global analysis on the ν4, ν5, ν6, and ν7 modes of DCCCN. © 1992.