Electronic Structure and Conformation Properties of Halogen -Substituted Acetyl Acrylic Anhydrides, CX<sub>3</sub>C(O)OC(O)CHCH<sub>2</sub> (X = H, F, or Cl)
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Abstract
Acetyl acrylic anhydride (CH<sub>3</sub>C(O)OC(O)CHCH<sub>2</sub>) and its halogen-substituted derivatives (CF<sub>3</sub>C(O)OC(O)CHCH<sub>2</sub> and CCl<sub>3</sub>C(O)OC(O)CHCH<sub>2</sub>) were prepared by the heterogeneous reaction of gaseous CH<sub>2</sub>CHC(O)Cl with CX<sub>3</sub>C(O)OAg (X = H, F, or Cl). The molecular conformations and electronic structure of these three compounds were investigated by HeI photoelectron spectroscopy, photoionization mass spectroscopy, FT-IR, and theoretical calculations. They were theoretically predicted to prefer the [ss-c] conformation, with each CO bond syn with respect to the opposite O–C bond and the CC bond in cis orientation to the adjacent CO bond. The experimental first vertical ionization potential for CH<sub>3</sub>C(O)OC(O)CHCH<sub>2</sub>, CF<sub>3</sub>C(O)OC(O)CHCH<sub>2</sub>, and CCl<sub>3</sub>C(O)OC(O)CHCH<sub>2</sub> was determined to be 10.91, 11.42, and 11.07 eV, respectively. In this study, the rule of the conformation properties of anhydride XC(O)OC(O)Y was improved by analyzing the different conformations of anhydrides with various substitutes
