Studies On Synthesis And Properties Of Triazole-bridged Dithienylethene Compounds With Pyrene Units

As considered as a new generation of electronic devices, molecular electronics have been in a rapid development in the twenty-first century. The current molecular electronics that designed by scientists experimentally or theoretically include molecular memories, molecular wires ,molecular switches and molecular rectifiers. Within these electronics researches on molecular electronics are striking and attractive, the reason lies on that molecular electronics are considered as the basic units for logic and memory circuit in the near future. Dithienylethene derivatives are a kind of molecular switches which has drawn much attention because of those good properties showing on thermally irreversible fatigue resistance and sensitivity to light. Dithienylethene derivatives are most likely to be applied in practice. Therefore, it is with great importance to explore and develop molecular switches containing dithienylethene derivatives ,which have novel structures and unique properties.The main contents are described as following:1. With dithienylethene as the basic skeleton, a series of symmetrical terminal alkynes were synthesized .Then a series of triazole-bridged dithienylethene compounds with pyrene units were synthesized using these alkynes via click reaction. Their structures were confirmed by’H NMR,13C NMR and elemental analysis.2. The photochromic properties of these compounds have been studied.The absorption spectral changes reveals that these compounds have different properties of photochromism.3. The fluorescence properties of these compounds have also been studied. The spectral data shows that these target compounds have monomer emission at 375 nm and 395 nm, alternatively, excimer emission locates at 475 nm. CompoundⅡ-3 has the strongest fluorescence emission at 475 nm, which indicates that it has the largest association degree of the inramolecular pyrene units. CompoundⅡ-2 has smaller association degree of pyrene units, while CompiundⅡ-1 has the smallest.4.To further study the sensitivity of CompoundⅡ-3 to the Cu2+, a fluorescence titration experiment was carried out. The spectral data show that CompoudⅡ-3 has great responsibility to the metal ion Cu2+...