Formation and spectroscopy of dicyanotriacetylene (NC₈N) in solid Kr.
Thermally induced creation of dicyanotriacetylene (NC8N) was observed in solid krypton. Samples were obtained by cryogenic trapping of gaseous cyanoacetylene/Kr mixtures subjected to electric discharges. Strong a (3)Σ(+)(u) → X (1)Σ(+)(g) phosphorescence of NC8N is reported here for the first time; its vibronic structure permitted the measurement of several ground-state vibrational frequencies. Other chemical species, mostly smaller than the precursor molecule, have also been formed, among them the dicarbon molecule (C2), and these may serve as indispensable building blocks in the NC8N synthesis. Processes leading to the elongation of cyanoacetylenic chains are of potential importance for the chemistry of icy grains present in the interstellar gas clouds.
†Institute of Physical Chemistry of the Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
Michał
M
Turowski
‡Institut des Sciences Moléculaires d'Orsay, UMR 8214 CNRS, Université Paris-Sud, 91405 Orsay, France.
Claudine
C
Crépin
‡Institut des Sciences Moléculaires d'Orsay, UMR 8214 CNRS, Université Paris-Sud, 91405 Orsay, France.
Stéphane
S
Douin
†Institute of Physical Chemistry of the Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
Robert
R
Kołos