Electronic spectra of tolan in a supersonic free jet: large-amplitude torsional motion

Photophysical Properties of Diphenylacetylene and Diphenylbutadiyne Derivatives in Solution Phase

“…Since the fluorescence from the 1B2u state is observed under the supersonic beam conditions [9], this state may not be the candidate of our S1 state. Taking account of the lifetime of the S1 state, we should detect the S1 fluorescence of DPA if the transition moment between S1-S0 is similar for DPA and diphenylhexatriene.…”

“…Recent INDO/S calculation predicted that the S1 state has Au symmetry [6]. Under the supersonic beam conditions, the energy gap between the 1Β1u and 2 1Αg states is less *The results of this paper were initially presented at The Jabłoński Centennial Conference on Luminescence and Photοphysics, July 28-27, 1998, Toruń, Poland. than 300 cm -1 [9]. Because of the existence of the mutual exclusion principle, the structure of the low lying excited singlet states of DPA should be planar in the gas phase.…”

Recent Developments in Ultrafast Time-Resolved Vibrational Spectroscopy of Electronically Excited States

“…Diphenylacetylene (DPA) is known for its extraordinary photophysics, which is thought to be caused by strong interactions of closely lying excited singlet states with the environments [15][16][17][18]. In rare gas matrices, a clear mirror-image relationship between the ultraviolet absorption and fluorescence spectra was found, indicating that the emission originates from the excited singlet state to which the absorption terminates [16].…”

Synthesis and Properties of Shape-Persistent Macrocyclic Amphiphiles with Switchable Amphiphilic Portions

“…This is done in such a way that switchable units can freely rotate, allowing the nonpolar or polar side chains to point into or outside the ring. In order to combine free rotation and stiffness of the backbone, the structures are based on the phenyl ± acetylene backbone, as schematically shown in the target structure M. [9,10] The sides of these shape-persistent macrocyclic amphiphiles are formed by the corner pieces (C and C' ') and by the amphiphilic portions (A) of the ring. The former contain additional substituents that influence the solubility and the crystallinity of the macrocycles.…”