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Zero-obliquity twin lattice quasi-symmetry threefold twinning in 1-{(R )-1-[(3-oxo-2-isoindolinoyl)methyl]-2-propenyl}-5- methyl-2,3-indolinedione

Abstract : Threefold twinning in 1-{(R)-1-[(3-oxo-2-isoindolinoyl)methyl]-2-propenyl}-5-methyl-2,3-indolinedione, C21H16N2O4 , has been reported recently [Trost et al.(2020). Org. Lett. 22, 2584–2589] but the twin characterization was not published. This twinning presents several interesting features. The crystal structure is monoclinic, but its lattice is metrically strongly pseudoorthorhombic and underpins a strongly pseudo-hexagonal sublattice. Several possible twin laws are compatible with these metric specializations, among which the one found experimentally corresponds to a trichromatic point group. Twinning is by reticular pseudo-merohedry with twin index 2 and zero obliquity but a non-zero twin misfit. The twin lattice coincides with the pseudo-hexagonal sublattice of the individual domain, which justifies the adoption of the unconventional setting B21 of the space group.
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Submitted on : Thursday, July 30, 2020 - 12:06:55 PM
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Massimo Nespolo, Rebecca W Smaha, Sean Parkin. Zero-obliquity twin lattice quasi-symmetry threefold twinning in 1-{(R )-1-[(3-oxo-2-isoindolinoyl)methyl]-2-propenyl}-5- methyl-2,3-indolinedione. Acta crystallographica Section B: Structural crystallography and crystal chemistry, International Union of Crystallography, 2020, 76 (4), pp.643-649. ⟨10.1107/S2052520620008021⟩. ⟨hal-02909350⟩



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