Second harmonic generation: applications in phase diagram investigations

Simon, F.; Mahieux, Julien; Clevers, Simon; Couvrat, Nicolas; Dupray, Valérie

doi:10.1051/matecconf/20130301011

Cited by 2 publications

(3 citation statements)

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“…These analyses show that the SHG efficiency, normalized with α Quartz 40 μm, of the racemic mixture is ∼2.5 times higher than that of the pure atropisomer. This behavior is due to the multiepitaxies which form a microstructure leading to Quasi-phase matching . The difference between the SHG efficiency of the physical racemic mixture and the recrystallized racemic mixture demonstrated the presence of this microstructure.…”

Section: Resultsmentioning

confidence: 99%

“…The difference between the SHG efficiency of the physical racemic mixture and the recrystallized racemic mixture demonstrated the presence of this microstructure. Moreover, there is a strong correlation between the SHG efficiency and the Tammann graph due to the multiepitaxy phenomena …”

Section: Resultsmentioning

confidence: 99%

“…Moreover, there is a strong correlation between the SHG efficiency and the Tammann graph due to the multiepitaxy phenomena. 34 Preferential Crystallization. The DSC analyses (Figure 16) had shown that BisT racemized in the molten state, which can be an advantage to obtain only one atropisomer from the racemic mixture with a yield of 100%.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Preparative Resolution of (±)-Bis-tetralone by Means of Autoseeded Preferential Crystallization Induced by Solvent Evaporation (ASPreCISE)

Mahieux

Sanselme

Harthong

et al. 2013

Crystal Growth & Design

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(±)-Bis-tetralone (BisT) crystallizes as a stable conglomerate that can be resolved by preferential crystallization. This preferential crystallization was performed by autoseeded polythermic programmed preferential crystallization (AS3PC) and autoseeded preferential crystallization induced by solvent evaporation (ASPreCISE) variants in dimethylformamide and dichloromethane. Prior to performance of these resolutions, an extensive purification was necessary because the presence of impurities had a strong negative impact on the stereoselective crystal growth. Moreover, the presence of multiepitaxy phenomena required a vigorous stirring during the preferential crystallization in order to avoid a poor optical purity of the crops. Several preferential crystallization attempts demonstrate that ASPreCISE is recommended when there is an unfavorable variation of solubility versus temperature or when chemical degradation occurs on heating.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

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