International Journal of Photoenergy / 2009 / Article / Tab 1

Research Article

Synthesis of Novel Iono- and Photochromic Spiropyrans Derived from 6,7-Dihydroxy-8-Formyl-4-Methyl-2H-Chromene-2-One

Table 1

Long-wavelength maxima of (4) and parameters of (4A)-(4B) equilibrium in chloroform at 293 K.

Comp.Absorption of (4), , (nm), ( , 1 mo  c )Content of form B,% = [B]/[A]

4a448 (2.31), 595 (1.72)28.60.401
4b447 (2.35), 595 (1.78)56.51.299
4c447 (2.40), 596 (1.82)23.50.307
4d452 (3.07), 605 (2.04)9.00.099
4e448 (1.85), 593 (1.63)63.01.702
4f0

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