N，N＇－1，4－亚丁基双螺吡喃和双螺噁嗪的合成及光致变色性能

Synthesis of N,N'-1,4-tetramethylene Bisspiropyran and Bisspirooxazine Compounds and Their Photochromism

合成三种Ｎ，Ｎ＇－１，４－亚丁基双螺吡喃和双螺噁嗪光致变色化合物，通过红外光谱、核磁共振氢谱及元素分析确证其结构。这些化合物熔点比相应的单螺环化合物高。还研究了闭环体与开环体（部花菁）的光致变色性能，发现双螺环化合物开环体的热稳定性较单螺环化合物高。

Three photochromic N,N'-1,4-tetramethylene bisspiropyran and bisspirooxazine compounds were synthesized.They have been identified by IR spectra,1H -NMR spectra and elemental analysis;Their melting points have been found higher than those of the corresponding monospirocyclic compounds.The photochromic properties of bisspirocyclic compounds and their ring opening form(merocyanine)were studied.It was found that the heat stability of their ring opening form is higher than that of the corresponding monospirocyclic compounds.