# MULTIPLE $n\Pi^{*}$ TRANSITIONS IN TETRAMETHYL–1, 3-CYCLOBUTANEDIONE

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 Title: MULTIPLE $n\Pi^{*}$ TRANSITIONS IN TETRAMETHYL–1, 3-CYCLOBUTANEDIONE Creators: Spafford, Ralph; Wrobel, Joseph; Baiardo, Joseph; Vala, Martin Issue Date: 1975 Publisher: Ohio State University Abstract: The polarized single crystal absorption spectrum of the cyclic diketone tetramethyl-1, 3-cyclobutanedione has been obtained in the near ultraviolet region (3700 -- 2600 \AA) at liquid helium temperatures. Four distinct n-$\Pi^{*}$ transitions are observed in the singlet manifold, experimentally verifying the $predicted^{1}$ strong interaction of the carbonyl groups. Spectral assignments have been made, clearly showing that the excited singlet states are distorted from the planar ground state geometry. The band assignments, excited state geometries, and nature of the through-bond” interaction will be discussed. Description: $^{1}$J. R. Swenson and R. Hoffman, Helv. Chim. Acta 53, 2331 (1970). This research was supported by the National Science Foundation."" Author Institution: Department of Chemistry, University of Florida URI: http://hdl.handle.net/1811/9275 Other Identifiers: 1975-MF-11