Influence of oleic acid on the nucleation and growth of 4-N,N-dimethylamino-4-N-methyl-stilbazoliumtosylate (DAST) crystals

Abstract

A simple solvent evaporation method, to control the nucleation and morphology of DAST single crystals is explored using a fatty acid as an additive.

Growth of 4-N,N-Dimethylamino-4'-N'-methyl-stilbazolium Tosylate (DAST) Organic Single Crystals Controlled by Oleic Acid

“…It is worth noting that compared with the typical DAST crystal grown without the OA control (Figure 2a), the morphology of the DAST crystal grown under the control of the OA is of an irregular hexagonal shape rather than a square platelet, but both crystals have the same crystal plane of (001) as the largest area. We note that the morphologies of the DAST single crystals grown under the control of the OA by the slow-cooling method as in this work are similar with those previously grown by the solvent evaporation method [14]. For the growth of DAST crystal under the control of the OA, the (010) face of DAST emerges since the oxygen atoms are exposed to the solution and OA for the (010) face, thus causing the formation of hydrogen bonds between the hydroxyl group of OA and the oxygen of DAST anions [14].…”

“…Moreover, Figure 2 reveals that both growth rates along the aand b-axis are higher in the crystal grown under the control of the OA than those in the crystal grown without the OA control. It is worth noting that the sizes of both DAST single crystals grown with (11 × 8 × 1.2 mm 3 ) and without (5.8 × 5.5 × 0.9 mm 3 ) the control of the OA by the slow-cooling method as in this work are significantly larger than those (6 × 3 × 1 mm 3 and 3 × 1.5 × 0.5 mm 3 , respectively) previously grown by the solvent evaporation method [14]. DAST crystal under the control of the OA, the (010) face of DAST emerges since the oxygen atoms are exposed to the solution and OA for the (010) face, thus causing the formation of hydrogen bonds between the hydroxyl group of OA and the oxygen of DAST anions [14].…”

“…In contrast, Hao et al reported that an appropriate amount of 4-Methylbenzenesulfonic acid (PTSA) additives can improve the stability of the growth solution, where the crystal structure and functional groups of DAST remain unchanged [13]. Recently, Thomas and co-workers described a method by adding (Z)-Octadec-9-enoic acid (oleic acid, OA) into the DAST solution, thus producing the DAST crystals with less hygroscopicity by a solvent evaporation method [14]. However, this previous work mainly focused on the nucleation and morphology of the resulting DAST crystals [14].…”

“…Recently, Thomas and co-workers described a method by adding (Z)-Octadec-9-enoic acid (oleic acid, OA) into the DAST solution, thus producing the DAST crystals with less hygroscopicity by a solvent evaporation method [14]. However, this previous work mainly focused on the nucleation and morphology of the resulting DAST crystals [14]. The optical properties and quality of the as-grown DAST crystals still remain unclear to date.…”

Фоторазрушение Субмикронных Кристаллов DAST В Пленке PMMA Путем Прямой Лазерной Записи

“…Используемые компоненты: PMMA (Plexiglas V045) и DAST (CAS: 80969-52-4 Genolite biotek). В качестве растворителей использованы хлороформ (CL0218 Scharlau) для PMMA (концентрация 5%) и метанол (322415 Aldrich) для DAST, концентрация которого соответствовала пределу растворимости при комнатной температуре [12]. Растворы смешаны в соотношении, при котором доля DAST составила 2% от массы PMMA.…”