The functionalized ligand (E)-4,4â²-(1,4-bis(methylthio)but-2-ene-2,3-diyl)dibenzoic acid (H2LS) and four metal-organic frameworks, [M2(LH)3(DMSO)4]·xDMSO (6 and 7 for M = Tb3+, Eu3+ respectively; LH = (E)-4,4â²-(ethene-1,2-diyl)dibenzoate) and [M2(LS)3(DMF)2(H2O)2] (8 and 9 for M = Eu3+, Tb3+) have been synthesized and characterized. All four MOFs adopt the anticipated connectivity, but the fold of interpenetration in each MOF crystal varies as a result of different solvent inclusion and ligand functionality. Compounds 6 and 7 contain a large amount of solvent molecules and tend to lose solvent in air. Compounds 8 and 9 are stable crystals without lattice solvent molecules in the crystals; the coordinating solvent molecules can be reversibly removed and replenished with the skeletons intact. All four MOFs show mainly the ligand-based luminescence, while 8 also displays metal-based luminescence.
功能化
配体(E)-4,4′-(1,4-双(甲
硫基)丁-2-烯-2,3-二基)二
苯甲酸(H2LS)和四种
金属有机框架,[M2(LH)3(
DMSO)4]·x
DMSO(M=Tb3+时的6和M=Eu3+时的7; LH=(E)-4,4′-(
乙烯-1,2-二基)二
苯甲酸)以及[M2(LS)3(
DMF)2(
H2O)2](M=Eu3+时的8和M=Tb3+时的9)已合成并表征。所有四种MOF均具有预期的键合方式,但由于溶剂包合和
配体功能性的不同,各MOF晶体的穿插折叠情况各异。化合物6和7含有大量溶剂分子,在空气中易失去溶剂。化合物8和9为不含晶格溶剂分子的稳定晶体,配位溶剂分子可逆地移除和补充,骨架保持完整。所有四种MOF主要显示出基于
配体的荧光发射,而8还展现出基于
金属的荧光发射。