title: UV-induced growth of cyanopolyyne chains in cryogenic solids.
abstract: UV laser excitation of cryogenic solids doped with cyanoethyne, HC(3)N, led to an in situ creation of longer carbon-nitrogen chains, namely HC(5)N, C(4)N(2), and C(6)N(2), heralded by their strong visible luminescence. HC(5)N and C(4)N(2) molecules can form, most probably, within HC(3)N aggregates linked by hydrogen bonds, while the reaction occurring between two isolated, photochemically created C(3)N radicals yields C(6)N(2). This latter species, dicyanobutadiyne, is easily detected in Ar, Kr, N(2), as well as in parahydrogen solids. The C(6)N(2) phosphorescence is identified here for the first time. The reported carbon chain coupling reactions in rigid environments are of interest for astrochemistry of interstellar ices.
authors.affiliation: Institut des Sciences Moléculaires d'Orsay, UMR 8214, Université Paris-Sud, CNRS, Orsay, France. claudine.crepin-gilbert@u-psud.fr
authors.forename: Claudine
authors.initials: C
authors.lastname: Crépin
authors.forename: Michał
authors.initials: M
authors.lastname: Turowski
authors.forename: Justinas
authors.initials: J
authors.lastname: Ceponkus
authors.forename: Stéphane
authors.initials: S
authors.lastname: Douin
authors.forename: Séverine
authors.initials: S
authors.lastname: Boyé-Péronne
authors.forename: Marcin
authors.initials: M
authors.lastname: Gronowski
authors.forename: Robert
authors.initials: R
authors.lastname: Kołos