MATRIX ISOLATION SPECTROSCOPY AND PHOTOCHEMISTRY OF TRIPLET 1,3-DIMETHYLPROPYNYLIDENE (MeC3Me)

Knezz, Stephanie N.

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https://hdl.handle.net/2142/79350 Copy

Description

Title

MATRIX ISOLATION SPECTROSCOPY AND PHOTOCHEMISTRY OF TRIPLET 1,3-DIMETHYLPROPYNYLIDENE (MeC3Me)

Author(s)

Knezz, Stephanie N.

Contributor(s)

• McMahon, Robert J.
• Burrmann, Nicola J.
• Haenni, Benjamin C.
• Waltz, Terese A

Issue Date

25-Jun-15

Keyword(s)

Cold/Ultracold/Matrices/Droplets

Abstract

Acetylenic carbenes and conjugated carbon chain molecules of the HC$_{emph{n}}$H family are relevant to the study of combustion and chemistry in the interstellar medium (ISM). Propynylidene (HC$_{3}$H) has been thoroughly studied and its structure and photochemistry determined.footnote{Seburg, R. A.; Patterson, E. V.; McMahon, R. J., Structure of Triplet Propynylidene (HCCCH) as Probed by IR, UV/vis, and EPR Spectroscopy of Isotopomers. Journal of the American Chemical Society 2009, 131 (26), 9442-9455.} Here, we produce triplet diradical 1,3-dimethylpropynylidene (MeC$_{3}$Me) photochemically from a precursor diazo compound in a cryogenic matrix (N$_{2}$ or Ar) at 10 K, and spectroscopic analysis is carried out. The infrared, electronic absorption, and electron paramagnetic resonance spectra were examined in light of the parent (HC$_{3}$H) system to ascertain the effect of alkyl substituents on delocalized carbon chains of this type. Computational analysis, EPR, and infrared analysis indicate a triplet ground state with a quasilinear structure. Infrared experiments reveal photochemical reaction to penten-3-yne upon UV irradiation. Further experimental and computational results pertaining to the structure and photochemistry will be presented.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

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http://hdl.handle.net/2142/79350

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