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The astronomical observation of isopropyl cyanide further stresses the linkbetween the chemical composition of the ISM and molecular composition of themeteorites in which there is a dominance of branched chain amino acids ascompared to the straight. However, observations of more branched chainmolecules in ISM will firmly establish this link. In the light of this, we haveconsidered C5H9N isomeric group in which the next higher member of the alkylcyanide and other branched chain isomers belong. High-level quantum chemicalcalculations have been employed in estimating accurate energies of theseisomers. From the results, the only isomer of the group that has beenastronomically searched, n-butyl cyanide is not the most stable isomer andtherefore, which might explain why its search could only yield upper limits ofits column density without a successful detection. Rather, the two most stableisomers of the group are the branched chain isomers, tert-butylnitrile andisobutyl cyanide. Based on the rotational constants of these isomers, it isfound that the expected intensity of tert-butylnitrile is the maximum amongthis isomeric group. Thus, this is proposed as the most probable candidate forastronomical observation. A simple LTE (Local thermodynamic equilibrium)modelling has also been carried out to check the possibility of detectingtert-butyl cyanide in the millimetre-wave region.

the european physical journal. d, atomic, molecular and optical physics/the european physical journal. d, atomic, molecular, optical and plasma physics

C5H9N Isomers: Pointers to Possible Branched Chain Interstellar Molecules