ACH-MODELS IN CHEMISTRY, vol.137, pp.643-652, 2000 (SCI-Expanded)
Different forms of phenolsulfonephthalein (phenol red) were subjected to semiempirical molecular orbital treatment at the level of AM1-RHF type calculations. All the forms considered were found to be stable and exogenic. However. most of the molecular orbital characteristics of these structures are highly different from each other.