Dicondensed indolinobenzospiropyrans as precursors of thermo- and photochromic spiropyrans. Part II: Assignment of (1)H and (13)C NMR spectra.
The (1)H and (13)C NMR spectra of dicondensed indolinobenzospiropyrans as precursors of thermo- and photochromic spiropyrans, DC1-DC5, were completely assigned. Especially, the (1)H assignment and coupling characteristics of the diastereotopic protons at the carbon-3 position of the benzopyran rings were achieved by conducting (1)H-(1)H COSY and nOe experiments. The dihedral angles (theta(1), theta(2) and theta(3)) calculated from the experimental values of the vicinal coupling constants ((3)J) of DC5 are in good agreement with the observed values in the solid state. All of the carbons in the DC dye molecules were investigated through a combination of heteronuclear 2D-shift correlation spectroscopy (HETCOR) and DEPT135.
Keum
Sam-Rok
SR
Department of New Material Chemistry, Korea University, Jochiwon 339-700, South Korea. keum@korea.ac.kr
Ahn
Su-Mi
SM
Roh
Se-Jung
SJ
Park
Su-Jin
SJ
Kim
Sung-Hoon
SH
Koh
Kwangnak
K
D001555:Benzene Derivatives / Q000737:chemistry* / Q000378:metabolism; D001578:Benzopyrans / Q000138:chemical synthesis / Q000737:chemistry* / Q000378:metabolism; D002247:Carbon Isotopes / Q000737:chemistry; D006358:Hot Temperature; D006859:Hydrogen / Q000737:chemistry; D007211:Indoles / Q000737:chemistry* / Q000378:metabolism; D049449:Luminescence; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D009574:Nitro Compounds; D010777:Photochemistry; D012015:Reference Standards
D001555:Benzene Derivatives; D001578:Benzopyrans; D002247:Carbon Isotopes; D007211:Indoles; D009574:Nitro Compounds; C088184:spiropyran; D006859:Hydrogen