Modular Chemistry 1997
DOI: 10.1007/978-94-011-5582-3_55
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Directing Nucleation and Growth of Molecular Crystals on Ordered Substrates: The Role of Epitaxial Interactions

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Cited by 2 publications
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“…Polymorphism is generally believed to be an intractable phenomenon that is very often observed upon crystallization from the melt or solution and is not easy to control. However, if the strategy for the control of polymorphism could be established, this phenomenon would be utilized as a fruitful methodology for producing several solid materials of different electronic or physicochemical properties from a given organic substance. , In this context, various methods such as changing the crystallization conditions, pseudo-seeding with a crystal of desired structure, or adding impurities or additives to inhibit the nucleation or the crystal growth of an undesired polymorphic form have been devised to obtain a desired polymorphic form by selective crystallization from the supersaturated solution.…”
Section: Introductionmentioning
confidence: 99%
“…Polymorphism is generally believed to be an intractable phenomenon that is very often observed upon crystallization from the melt or solution and is not easy to control. However, if the strategy for the control of polymorphism could be established, this phenomenon would be utilized as a fruitful methodology for producing several solid materials of different electronic or physicochemical properties from a given organic substance. , In this context, various methods such as changing the crystallization conditions, pseudo-seeding with a crystal of desired structure, or adding impurities or additives to inhibit the nucleation or the crystal growth of an undesired polymorphic form have been devised to obtain a desired polymorphic form by selective crystallization from the supersaturated solution.…”
Section: Introductionmentioning
confidence: 99%
“…As the control experiment, crystallization began within 24 h in the same supersaturated 2-PrOH solution in the absence of the δ-form seed crystals, resulting in a substantial enantiomeric enrichment of 1a up to 70% ee in the mother liquor together with the exclusive formation of the α-form crystals . This difference in the crystallization rate can well be interpreted by assuming that the added δ-form seed crystals of (±)- 1b serve both as the additive to inhibit the nucleation or crystal growth process of the α-form 12 and as the substrate for heterogeneous nucleation of the δ-form of 1a . , The reached low ee value of 1a in the mother liquor in the crystallization with the δ-form seed crystals is supposed to be correlated with the slow crystallization, because even slow crystallization of the α-form crystals of (±)- 1a conducted at the lower concentrations does not give a high ee value of the solute in the mother liquor.
7 (a) Crystal structure of the δ-form of (±)- 1a .
…”
Section: Resultsmentioning
confidence: 99%
“…18 This difference in the crystallization rate can well be interpreted by assuming that the added δ-form seed crystals of (()-1b serve both as the additive to inhibit the nucleation or crystal growth process of the R-form 12 and as the substrate for heterogeneous nucleation of the δ-form of 1a. 10,11 The reached low ee value of 1a in the mother liquor in the crystallization with the δ-form seed crystals is supposed to be correlated with the slow crystallization, because even slow crystallization of the R-form crystals of (()-1a conducted at the lower concentrations does not give a high ee value of the solute in the mother liquor. By comparison of the powder X-ray diffraction (XRD) patterns as shown in Figure 3, the crystal structure of the new polymorphic form of (()-1a has turned out to be isomorphous with that of the δ-form crystal of (()-1b.…”
Section: Resultsmentioning
confidence: 99%
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