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1 Polish Journal of Chemistry

1 2002

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Spectroscopic, Studies of Two Dynamicallly Different 1,4-Dihydropyridine Structures

Śliwińska E., Palewska K., Lewanowicz A., Lipiński J., Sworakowski J., Gancarz R., Nešpůrek S.

Polish Journal of Chemistry

2002

Vol. 76 / nr 2-3

235-247

Results of spectroscopic studies of solutions of two photoactive dihydropyridine derivatives: 1-methyl-2,4,4,6-tetraphenyl-1,4-dihdyropyridine and 4,4-(biphenyl-2,2_-diyl)- 2,6-diphenyl-1-methyl-1,4-dihydropyridine (hereafter referred to as DHP and BDH, respectively) are presented. The analysis of UV-Vis and NMR spectra points to a different behaviour of the two molecules under study, in spite of a close similarity of formal molecular structures. These results indicate that two isomers of BDH exist in solid matrices, as well as in liquid solutions, in the temperature range studied. No such feature has been detected in DHP.We attribute the difference to an enhanced stiffness of the BDH molecule resulting from a bridge between side phenyl groups.