Crystallographic analysis reveals the orthorhombic lattice parameters of an azomethine imine betaine, suggesting the structural origin of its photochromic behaviour.
Abstract 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.
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Kulpe et al. (1982) studied this question.
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