College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu, China.
Chem Commun (Camb). 2019 Mar 19;55(24):3532-3535. doi: 10.1039/c9cc00864k.
Solvothermal reaction of Zn(NO3)2 with 2,9-bis-(2-pyridine-3-yl-vinyl)-[1,10]phenanthroline (3-bpep) and furan-2,5-dicarboxylic acid (2,5-H2FDC) afforded a one-dimensional (1D) coordination polymer {[Zn2(3-bpep)2(2,5-FDC)2]·1.5H2O}n (1), which undergoes regioselective photocycloaddition to yield another 1D coordination polymer {[Zn2(3-bpep)(trans,rctt-3-bpbpycb)0.5(2,5-FDC)2]·H2O}n (2) in a single-crystal-to-single-crystal manner under UV light irradiation. The reverse process from 2 to 1 can be achieved by heating 2 at 240 °C. Such a photocycloaddition/thermocycloreversion cycle results in an interesting reversible dielectric switching.
水热反应中 Zn(NO3)2 与 2,9-双-(2-吡啶-3-基-乙烯基)-[1,10]菲咯啉(3-bpep)和呋喃-2,5-二羧酸(2,5-H2FDC)生成了一维(1D)配位聚合物{[Zn2(3-bpep)2(2,5-FDC)2]·1.5H2O}n(1), 在紫外光照射下，它通过区域选择性光环加成反应生成另一个 1D 配位聚合物{[Zn2(3-bpep)(trans,rctt-3-bpbpycb)0.5(2,5-FDC)2]·H2O}n(2)，以单晶到单晶的方式。在 240°C 加热 2 可以实现从 2 到 1 的反过程。这种光环加成/热环还原循环导致了有趣的可逆介电开关。
