达布科
辛烷值
乙腈
发光
化学
立方烷
金属有机骨架
水溶液
溶剂
晶体结构
甲醇
激发态
光化学
物理化学
结晶学
无机化学
材料科学
有机化学
物理
光电子学
吸附
核物理学
作者
Dario Braga,Lucia Maini,Paolo Pio Mazzeo,Barbara Ventura
标识
DOI:10.1002/chem.200900743
摘要
Abstract The metal–organic frameworks (MOF) of cluster [Cu 4 I 4 (DABCO) 2 ] (DABCO=1,4‐diazabicyclo[2.2.2]octane) have been prepared and characterized as two different crystalline forms, I and II . Form I is obtained by reaction of DABCO and CuI in aqueous solution or by solvothermal reaction, while form II is obtained by reacting DABCO and CuI in acetonitrile. Their luminescence properties in the solid state have been analyzed at room temperature and at 77 K. MOF II has bright emission with a maximum at 556 nm that shifts bathochromically at low temperature in conjunction with a marked change in the colour of the emission. The emission of MOF I has a maximum at 580 nm and a less pronounced temperature dependence. The peculiar luminescence properties of the two isomers have been interpreted by utilising current knowledge on the excited states properties of Cu I cubane clusters. The two isomers exhibit a high degree of porosity and can release the disordered solvent molecules trapped in the channels, whilst preserving the crystal structure. Isomer I can be converted into II on exposure to acetonitrile or methanol vapour, whereas II reverts to I when heated in a closed pan at 250 °C.
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