| Popis: |
Polymorphism in aminocoumarins has been observed in only one other instance [Jasinski & Paight (1994). Acta Cryst. C50, 1928-1930]. This structure, C 14 H 15 NO 2 , represents the first reported observation of a non-centrosymmetric moiety in an aminocoumarin laser-dye compound. These differences, as well as those observed in luminescence changes, may result from the crystallization of C13 in an out-of-plane position in the cyclopenta[c] ring of polymorph (II). The crystal structures of both polymorphs [(I) and (II)] are stabilized by van der Waals forces |
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