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We present a study of cyanoacetylene (HC3N) and cyanodiacetylene (HC5N) inOrion KL, through observations from two line surveys performed with the IRAM30m telescope and the HIFI instrument on board the Herschel telescope. Thefrequency ranges covered are 80-280 GHz and 480-1906 GHz. We model the observedlines of HC3N, HC5N, their isotopologues (including DC3N), and vibrationalmodes, using a non-LTE radiative transfer code. To investigate the chemicalorigin of HC3N and DC3N in Orion KL, we use a time-dependent chemical model. Wedetect 40 lines of the ground state of HC3N and 68 lines of its 13Cisotopologues. We also detect 297 lines of six vibrational modes of thismolecule (nu_7, 2nu_7, 3nu_7, nu_6, nu_5, and nu_6+nu_7) and 35 rotationallines of the ground state of HC5N. We report the first tentative detection ofDC3N in a giant molecular cloud with a DC3N/HC3N abundance ratio of 0.015. Weprovide column densities and isotopic and molecular abundances. We also performa 2x2" map around Orion IRc2 and we present maps of HC3N lines and maps oflines of the HC3N vibrational modes nu_6 and nu_7. In addition, a comparison ofour results for HC3N with those in other clouds allows us to derivecorrelations between the column density, the FWHM, the mass, and the luminosityof the clouds. The high column densities of HC3N obtained in the hot core, makethis molecule an excellent tracer of hot and dense gas. In addition, the largefrequency range covered reveals the need to consider a temperature and densitygradient in the hot core in order to obtain better line fits. The high D/Hratio (comparable to that obtained in cold clouds) that we derive suggests adeuterium enrichment. Our chemical models indicate that the possible deuteratedHC3N present in Orion KL is formed during the gas-phase. This fact provides newhints concerning the processes leading to deuteration.

A combined IRAM and Herschel/HIFI study of cyano(di)acetylene in Orion KL: tentative detection of DC3N