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HCCNC and HNC3 are less commonly found isomers of cyanoacetylene, HC3N, amolecule that is widely found in diverse astronomical sources. We want to knowif HNC3 is present in sources other than the dark cloud TMC-1 and how itsabundance is relative to that of related molecules. We used the ASAI unbiasedspectral survey at IRAM 30m towards the prototypical prestellar core L1544 tosearch for HNC3 and HCCNC which are by-product of the HC3NH+ recombination,previously detected in this source. We performed a combined analysis ofpublished HNC3 microwave rest frequencies with thus far unpublished millimeterdata because of issues with available rest frequency predictions. We determinednew spectroscopic parameters for HNC3, produced new predictions and detected ittowards L1544. We used a gas-grain chemical modelling to predict the abundancesof N-species and compare with the observations. The modelled abundances areconsistent with the observations, considering a late stage of the evolution ofthe prestellar core. However the calculated abundance of HNC3 was found 5-10times higher than the observed one. The HC3N, HNC3 and HCCNC versus HC3NH+ratios are compared in the TMC-1 dark cloud and the L1544 prestellar core.

High spectral resolution observations of HNC3 and HCCNC in the L1544 prestellar core