AB-INITIO ROTATIONAL-CONSTANTS OF THE NITRILES DERIVED FROM CYANODIACETYLENE (HC4CN)

The rotational constants and the dipole moments of the 14 hydrogenated nitriles derived from cyanodiacetylene, its isomers, and those confor mers for which experimental data is available have been calculated wit h ab initio methods. The high dipole moment of these compounds, the pr esence of cyanodiacetylene in different regions of space, as well as t he great abundance of hydrogen in the dense clouds could lead to the d etection of the species being studied here in the interstellar medium.