光致变色液晶萘并吡喃的合成及光致变色性质

Synthesis of Liquid Crystalline 3H-Naphtho[2,1-b] Pyrans and Studies on Their Photochromic Characteristic

在相转移催化剂C18H37N(CH3)3C l的存在下合成了6-十二烷基-2-萘酚;6-十二烷基-2-萘酚分别与3种炔醇进行缩合,得到了3种萘环上有柔性长链的萘并吡喃:8-十二烷基-3,3-二苯基-3H-萘并[2,1-b]吡喃(NP1)、8-十二烷基-3,3-二(4,4′-甲氧基)苯基-3H-萘并[2,1-b]吡喃(NP2)、8-十二烷基-3,3-二(4,4′-甲氧基)苯基-3H-萘并[2,1-b]吡喃(NP3),对它们在溶液中和高分子膜中光致变色性能进行了研究。利用POM与DSC对其液晶性进行了研究,发现NP1和NP3具有液晶性质。

N,N,N- trimethyloctadecan- 1 -aminium chloride was used to prepare 6 -dodecylnaphthen- 2- ol. And three novel 3H - naphtho[ 2,1 - b ] pyrans with long chain substituents were synthesized by the condensation of 6 - n - dodecylnaphthen - 2 - ol with prop - 2 - yn - 1 - ols, which are 8 - dodecyl - 3,3＇ - diphenyl - 3H - naph- tho[2,1 - b] pyran（ NP1 ）, 8 - dodecyl - 3,3＇ - bis （ p - methoxyphenyl） - 3H - naphtho[2,1 - b] pyran（NP2） and 8 - dodecyl - 3,3＇ - bis （ p - n - butoxyphenyl） - 3 H - naphtho [ 2,1 - b ] pyran （ NP3 ）, respectively. The incorporation of long alkyl groups into the rigid naphthopyran results in the liquid crystalline property. The liquid crystal phases of the three compounds were studied by means of differential scanning calorimetry （DSC） and Polari- zing optical microscope （POM） with a heating stage. And the photochromis properties, doped in PMMA and dis- solved in toluene, were investigated, too.