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首页> 外文期刊>Crystal growth & design >Crystal Growth and Morphology Control of OH1 Organic Electrooptic Crystals
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Crystal Growth and Morphology Control of OH1 Organic Electrooptic Crystals

机译：OH1有机电光晶体的晶体生长和形貌控制

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We report on the growth of large-size phenolic configurationally locked polyene OH1 (2-(3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene)malononitrile) organic bulk crystals. OH1 has been recently identified as very promising for electro-optic and THz-wave applications, with several advantages compared to the benchmark ionic salts such as DAST (4'-dimethylamino-N-methyl-4-stilbazolium tosylate) and DSTMS (4-N,N-dimethylamino-4'-N'-methyl-stilbazolium 2,4,6-trimethylbenzene sulfonate). We investigate the thermodynamic equilibrium conditions, the solubility, and the metastable zone of OH1/methanol system. The intermolecular hydrogen-bond interactions between the OH1 and methanol molecules impede the main supramolecular interactions between the OH1 molecules, which results in a strong delay in nucleation and provides a very large metastable-zone width. We furthermore studied the crystal morphology and the solvent effect by analyzing the relationship between the morphology and the molecular orientation at the crystal surface as well as the growth direction. The growth kinetics of specific OH1 crystal faces for different growth methods (slow evaporation or supercooling) has been studied. In the OH1/methanol system with a large metastable-zone width, we can grow large OH1 crystals and control their morphology. Thinner or thicker crystals of about 15 x 12 x 1 mm(3) and 18 x 17 x 4 mm(3), respectively, with good optical quality can be grown in roughly 2 weeks time.
机译：我们报告增长的大型酚配置锁多烯OH1（2-（3-（4-羟基苯乙烯）-5,5-二甲基环己-2-烯基）丙二腈）有机整体晶体的生长。 OH1最近被认为对于电光和THz波应用非常有前途，与基准离子盐（例如DAST（4'-二甲氨基-N-甲基-4-stilbazolium甲苯磺酸盐））和DSTMS（4- N，N-二甲基氨基-4'-N'-甲基-噻唑鎓2,4,6-三甲基苯磺酸盐）。我们研究了OH1 /甲醇系统的热力学平衡条件，溶解度和亚稳区。 OH1和甲醇分子之间的分子间氢键相互作用阻碍了OH1分子之间的主要超分子相互作用，这导致成核作用强烈延迟，并提供了非常大的亚稳区宽度。我们还通过分析晶体表面的形态与分子取向以及生长方向之间的关系来研究晶体的形态和溶剂效应。研究了特定OH1晶面在不同生长方法（慢速蒸发或过冷）下的生长动力学。在具有大的亚稳区宽度的OH1 /甲醇系统中，我们可以生长大的OH1晶体并控制其形态。可以在大约2周的时间内生长出厚度约15 x 12 x 1 mm（3）和18 x 17 x 4 mm（3）的较薄或较厚的晶体。

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