title: Photoisomerization of Trans Ortho-, Meta-, Para-Nitro Diarylbutadienes: A Case of Regioselectivity.
abstract: A series of ortho-, meta- and para-substituted trans-nitro aryl (phenyl and pyridyl) butadienes have been synthesized and characterized. The effect of substitution and positional selectivity on their fluorescence and photoisomerization were systematically investigated. Among all dienes, meta- and para-nitro phenyl-substituted derivatives exhibit remarkable solvatochromic emission shifts due to intramolecular charge transfer. On the other hand, ortho derivatives undergo regioselective isomerization upon photoexcitation in contrast to inefficient isomerization of para and meta nitro-substituted dienes. Single crystal X-ray analysis revealed existence of intramolecular hydrogen bonding between the nitro group and the hydrogen of the proximal double bond. This restricts the rotation of the proximal double bond thereby allowing regioselective isomerization. The observations were also supported by NMR spectroscopic studies.
authors.affiliation: Department of Chemistry, Indian Institute of Technology Gandhinagar, Ahmedabad, India.
authors.forename: Harsha
authors.initials: H
authors.lastname: Agnihotri
authors.affiliation: Department of Chemistry, Indian Institute of Technology Gandhinagar, Ahmedabad, India.
authors.forename: Mahalingavelar
authors.initials: M
authors.lastname: Paramasivam
authors.affiliation: Department of Chemistry, Indian Institute of Technology Gandhinagar, Ahmedabad, India.
authors.forename: Veerabhadraiah
authors.initials: V
authors.lastname: Palakollu
authors.affiliation: Department of Chemistry, Indian Institute of Technology Gandhinagar, Ahmedabad, India.
authors.forename: Sriram
authors.initials: S
authors.lastname: Kanvah
mesh_terms: D018360:Crystallography, X-Ray; D006838:Hydrocarbons / Q000737:chemistry*; D006860:Hydrogen Bonding; D007536:Isomerism; D008027:Light; D015394:Molecular Structure; D010777:Photochemistry; D013237:Stereoisomerism
chemical_list: D006838:Hydrocarbons