Glass Formation and Phase Transition of Novel π-Electron Starburst Molecules, 1,3,5-Tris(phenyl-2-thienylamino)benzene and 1,3,5-Tris(phenyl-3-thienylamino)benzene
作者:Emi Ueta、Hideyuki Nakano、Yasuhiko Shirota
DOI:10.1246/cl.1994.2397
日期:1994.12
Novel π-electron starburst molecules, 1,3,5-tris(phenyl-2-thienylamino)benzene (α-TPTAB) and 1,3,5-tris(phenyl-3-thienylamino)benzene (β-TPTAB), are found to form amorphous glasses with well-defined glass-transition temperatures of 38 and 46 °C, respectively, while 1,3,5-tris(diphenylamino)benzene instantly crystallizes. The result leads to a concept of “increasing the number of conformers of nonplanar molecules” for a molecular design of amorphous molecular glasses. The glasses of α-TPTAB and β-TPTAB are found to be transformed finally into crystals with the highest melting points via metastable crystals on heating.
新型π电子星芒分子——1,3,5-三(苯基-2-噻吩胺基)苯(α-TPTAB)和1,3,5-三(苯基-3-噻吩胺基)苯(β-TPTAB)被发现分别在38°C和46°C形成具有明确定义的玻璃化转变温度的非晶玻璃,而1,3,5-三(二苯胺基)苯则会立即结晶。这一结果导致了“增加非平面分子构象数”的非晶分子玻璃分子设计的概念。通过加热,α-TPTAB和β-TPTAB的玻璃最终会转变为通过亚稳晶体达到的最高熔点晶体。