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Structures of Azomethine Imines of the Pyrazolidone‐(3)‐type (I). The Structure of 1‐(4‐Nitrobenzylidene‐pyrazolidone‐(3)‐betaine
Author(s) -
Kulpe S.,
Seidel I.,
Geissler G.,
Tomaschewski G.
Publication year - 1982
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170170112
Subject(s) - orthorhombic crystal system , betaine , crystal structure , diffractometer , chemistry , crystallography , molecule , stereochemistry , organic chemistry
1‐(4‐Nitrobenzylidene)‐pyrazolidone‐(3)‐betaine crystallizes in the orthorhombic space group Pbca with eight molecules per unit cell. The lattice parameters are a = 11.025 Å; b = 22.995 Å; c = 7. 677 Å. With X‐ray diffraction data, collected on a automatical four circle diffractometer, the crystal structure was solved by direct methods and refined to an R ‐value of 0.047 for 1516 symmetrically independent reflections. The structure determination has been performed to contribute to the explanation of the photochromic behaviour of this special class of azomethine imines.