title: Conformational isomers from rotation of diacetylenic bond in an ethynylpyrene-substituted molecular hinge.
abstract: The first example of isolation and X-ray crystallographic structural characterization of two conformers arising from rotation along a diacetylenic bond is reported. In both the conformers extensive pi-pi interactions are observed in the solid state. VT-NMR and fluorescence spectroscopic studies in solution suggest that the closed and open conformers are in equilibrium and that the closed conformer is the predominant species at room temperature.
authors.affiliation: Department of Chemistry, Sophisticated Analytical Instrument Facility, Indian Institute of Technology Madras, Chennai 600036, India. sanka@iitm.ac.in
authors.forename: Sethuraman
authors.initials: S
authors.lastname: Sankararaman
authors.forename: Gandikota
authors.initials: G
authors.lastname: Venkataramana
authors.forename: Babu
authors.initials: B
authors.lastname: Varghese