Laboratory measurements of gas-phase reactions of polyatomic carbon ions C+n(n=1–6) and CnH+(n=2–5) with carbon monoxide

Abstract

The selected-ion flow tube (SIFT) technique has been employed in the study of reactions of carbon monoxide with the polyatomic carbon cations C+n(n=1−6) and CnH+(n=2–5) at 296±2 K in helium buffer gas at ∼0.34 Torr and 1.1×1016 atoms cm−3. The polyatomic carbon cations were generated by electron impact on a suitable parent molecule. Carbon monoxide was observed to add rapidly to C+n(n=2–6) twice in succession to form polyatomic carbon monoxide and dioxide cations, and once to CnH+ to form polyatomic carbon monoxide cations. Further additions did not occur with measurable specific rates. This remarkable behavior is attributed to double bond formation at the terminal carbon atoms of the polyatomic carbon cations. The specific rate for the addition of CO was observed to vary with the size of the polyatomic carbon cation, increasing to a maximum for reactions with five atoms in the reacting ion. This trend is attributed to an increase in the lifetime of the intermediate addition complex.

Generation of Two Isomers of C5H from the Corresponding Anions. A Theoretically Motivated Mass Spectrometric Study

“…Charged analogues of C 5 H have also received comparatively little attention. Bohme and co-workers have reported a number of ion−molecule reactions of the C 5 H cation . Formed from electron impact ionization of 1,4-pentadiyne by a mechanism that is not clear, the C 5 H + ion observed is assumed to adopt a linear structure (since low-level calculations have suggested this cation to be stable with a linear geometry 14 ).…”

“…Bohme and co-workers have reported a number of ion-molecule reactions of the C 5 H cation. 29 Formed from electron impact ionization of 1,4-pentadiyne by a mechanism that is not clear, the C 5 H + ion observed is assumed to adopt a linear structure (since low-level calculations have suggested this cation to be stable with a linear geometry 14 ). Of more interest, however, is related work by the same group that shows that reaction between cationic carbon and neutral diacetylene leads to rapid formation of C 5 H + .…”

Gas-phase reactions of carbon cluster ions with isomeric chloropropenes

“…Experimental studies have shown that small C,+ (n < 10) cluster ions are more reactive than larger ones [2,3] and also undergo different * Corresponding author.…”

Surgical management of sinonasal hemangiopericytomas: A case series

“…Ever since Douglas 1 proposed carbon chains as possible carriers of the diffuse interstellar bands (DIBs), the linear carbon clusters, including pure carbon chains and their heteroatom‐containing derivatives, have attracted a considerable attention, both experimentally and theoretically 2–9. Among these clusters, the hydrogen‐doped carbon clusters as the most important species have been investigated extensively 10–37.…”

“…In 1982, Wilson and Green 34 predicted the bond lengths and rotational constants of C 2 H + and C 4 H + by theoretical calculations, although their ground states are still unclear. The selected‐ion flow tube (SIFT) technique has been used to explore gas‐phase reactions of carbon monoxide with the polyatomic carbon cations C n H + ( n = 2–5) 35. The vertical electronic spectrum of linear C 5 H + has been predicted by ab initio multireference configuration interaction (MRD‐CI) calculations 36.…”