Facilitating Interstellar Searches for Simple Amino Alcohols with Accurate Rest Frequencies into the Millimeter-wave Regime: Alaninol, Valinol, and Leucinol

The detection of larger complex organic molecules, such as molecules consisting several functional groups or those which show conformational flexibility, in the interstellar medium could lead to insights into availability biomolecules space. We present rotational spectroscopic study three amino alcohols: alaninol, valinol, and leucinol. spectra were recorded over 2–110 GHz region, included utilization a newly developed instrument operating between 18–26 GHz. report accurately determined line lists, constants, centrifugal distortion nuclear quadrupole coupling constants for two conformers four leucinol, well singly substituted heavy-atom isotopologues, also provide structural insights. Further, number vibrationally excited states assigned, associated motions revealed with anharmonic frequency calculations. Accurate predictions transitions millimeter-wave regime all species made, facilitating searches these by observational facilities ALMA. Their would establish new family molecules.