Crystal Growth and Morphology Control of OH1 Organic Electrooptic Crystals
Crystal Growth and Morphology Control of OH1 Organic Electrooptic Crystals
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DOI：
10.1021/cg900882h
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发表时间：
2010-04-01
影响因子：
3.8
通讯作者：
Guenter, Peter
中科院分区：
文献类型：
--
作者：
Kwon, Seong-Ji;Jazbinsek, Mojca;Guenter, Peter
我们报告了大尺寸酚醛构型锁定多烯 OH1（2-(3-(4-羟基苯乙烯基)-5,5-二甲基环己-2-烯基）丙二腈）有机块状晶体的生长。 OH1 最近被认为在电光和太赫兹波应用中非常有前景，与 DAST（4'-二甲氨基-N-甲基-4-芪唑甲苯磺酸盐）和 DSTMS（4-N,N-二甲氨基-4'-N'-甲基-芪唑鎓 2,4,6-三甲基苯磺酸盐）等基准离子盐相比具有多种优势。我们研究了 OH1/甲醇体系的热力学平衡条件、溶解度和介稳区。 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，这导致成核的强烈延迟并提供非常大的介稳区宽度。通过分析形貌与晶体表面分子取向以及生长方向之间的关系，我们进一步研究了晶体形貌和溶剂效应。研究了不同生长方法（缓慢蒸发或过冷）的特定 OH1 晶面的生长动力学。在介稳区宽度较大的 OH1/甲醇体系中，我们可以生长大的 OH1 晶体并控制其形貌。具有良好光学质量的较薄或较厚的晶体分别约为 15 x 12 x 1 mm(3) 和 18 x 17 x 4 mm(3)，可在大约 2 周的时间内生长。
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.