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首页> 外文期刊>ACS nano >Solvent-dependent stabilization of metastable monolayer polymorphs at the liquid-solid interface
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Solvent-dependent stabilization of metastable monolayer polymorphs at the liquid-solid interface

机译：液-固界面处亚稳单层多晶型物的溶剂依赖性稳定

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Self-assembly of 1,3,5-tris(4′-biphenyl-4″-carbonitrile)benzene monolayers was studied at the liquid-solid interface by scanning tunneling microscopy. Application of different fatty acid homologues as solvents revealed a solvent-induced polymorphism. Yet, tempering triggered irreversible phase transitions of the initially self-assembled monolayers, thereby indicating their metastability. Interestingly, in either case, the same thermodynamically more stable and more densely packed monolayer polymorph was obtained after thermal treatment, irrespective of the initial structure. Again, the same densely packed structure was obtained in complementary solvent-free experiments conducted under ultrahigh vacuum conditions. Thus, self-assembly of metastable polymorphs at room temperature is explained by adsorption of partially solvated species under kinetic control. The irreversible phase transitions are induced by thermal desolvation, that is, desorption of coadsorbed solvent molecules.
机译：通过扫描隧道显微镜研究了1,3,5-三（4'-联苯-4''-腈）苯单层的自组装。应用不同的脂肪酸同系物作为溶剂显示出溶剂诱导的多态性。然而，回火触发了最初自组装单分子层的不可逆相变，从而表明了它们的亚稳定性。有趣的是，在任何一种情况下，热处理后，无论初始结构如何，都可获得相同的热力学上更稳定和更紧密堆积的单层多晶型物。再次，在超高真空条件下进行的补充性无溶剂实验中，获得了相同的致密堆积结构。因此，通过在动力学控制下吸附部分溶剂化的物种来解释亚稳态多晶型物在室温下的自组装。不可逆的相变是由热脱溶剂作用引起的，即共吸附的溶剂分子的解吸作用。

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