Collimating the growth of twisted crystals of achiral compounds.

Autor: Lozano I; Department of Chemistry and Molecular Design Institute, New York University, New York City, New York, USA., Whittaker SJ; Department of Chemistry and Molecular Design Institute, New York University, New York City, New York, USA., Yang Y; Department of Chemistry and Molecular Design Institute, New York University, New York City, New York, USA., Tiwari A; Department of Chemistry and Molecular Design Institute, New York University, New York City, New York, USA., Zhou H; Department of Chemistry and Molecular Design Institute, New York University, New York City, New York, USA., Kim S; Department of Chemistry and Molecular Design Institute, New York University, New York City, New York, USA., Mendoza M; Department of Chemistry and Molecular Design Institute, New York University, New York City, New York, USA., Sow M; Department of Chemistry and Molecular Design Institute, New York University, New York City, New York, USA., Shtukenberg AG; Department of Chemistry and Molecular Design Institute, New York University, New York City, New York, USA., Kahr B; Department of Chemistry and Molecular Design Institute, New York University, New York City, New York, USA., An Z; Department of Chemistry and Molecular Design Institute, New York University, New York City, New York, USA., Lee SS; Department of Chemistry and Molecular Design Institute, New York University, New York City, New York, USA.
Jazyk: angličtina
Zdroj: Chirality [Chirality] 2023 Jul; Vol. 35 (7), pp. 418-426. Date of Electronic Publication: 2023 Mar 18.
DOI: 10.1002/chir.23558
Abstrakt: A great proportion of molecular crystals can be made to grow as twisted fibrils. Typically, this requires high crystallization driving forces that lead to spherulitic textures. Here, it is shown how micron size channels fabricated from poly(dimethylsiloxane) (PDMS) serve to collimate the circular polycrystalline growth fronts of optically banded spherulites of twisted crystals of three compounds, coumarin, 2,5-bis(3-dodecyl-2-thienyl)-thiazolo[5,4-d]thiazole, and tetrathiafulvalene. The relationships between helicoidal pitch, growth front coherence, and channel width are measured. As channels spill into open spaces, collimated crystals "diffract" via small angle branching. On the other hand, crystals grown together from separate channels whose bands are out of phase ultimately become a single in-phase bundle of fibrils by a cooperative mechanism yet unknown. The isolation of a single twist sense in individual channels is described. We forecast that such chiral molecular crystalline channels may function as chiral optical wave guides.
(© 2023 Wiley Periodicals LLC.)
Databáze: MEDLINE
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