Conformational isomers from rotation of diacetylenic bond in an ethynylpyrene-substituted molecular hinge.
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.
Sankararaman
Sethuraman
S
Department of Chemistry, Sophisticated Analytical Instrument Facility, Indian Institute of Technology Madras, Chennai 600036, India. sanka@iitm.ac.in
Venkataramana
Gandikota
G
Varghese
Babu
B