二维配位聚合物[Tb（1,4-bdc）1.5（phen）（H2O）]n的结构与光致发光性能研究

采用水热合成方法,在180℃条件下,高氯酸铽、1,10-菲罗啉和对苯二甲酸反应,合成了稀土铽(III)的二维配合物Tb(1,4-bdc)1.5(phen)(H2O)]n(1)(phen=1,10-菲罗啉;1,4-H2bdc=对苯二甲酸)。单晶衍射分析结果表明,该配合物属三斜晶系,P1空间群,晶胞参数为a=1.03430(10)nm,b=1.0854(2)nm,c=1.1399(2)nm,α=107.284(16)°,β=91.58(2)°,γ=113.104(15)°。Tb(III)离子为八配位,六个配位氧原子中五个来自1,4-bdc,另一个来自配位水分子。两个配位氮原子来自1,10-菲罗啉分子。1,4-bdc在配合物中有三配位和四配位两种配位方式。该配合物在波长为325nm紫外光的激发下发射Tb(III)的绿色特征荧光,其光致发光的绝对量子产率为36%(λex=325nm),其5D4激发态的荧光寿命为0.638ms。

Crystal Structure and Luminescent Properties of 2D Coordination Polymer [Tb(1,4-bdc) 1.5(phen) (H2O)] n

2D terbium coordination polymerTb(1,4-bdc)1.5(phen)(H2O)]n(1)(1,4-H 2bdc=terephthalic acid;phen=1,10-phenanthroline)was synthesized by hydrothermal method at 180℃with the reaction of 1,4-H 2bdc,terbium chlorate and 1,10-phenanthroline under hydrothermal condition.Single crystal analysis shows complex 1 crystallizes in triclinic system,P 1 space group with a=1.03430(10)nm,b=1.0854(2)nm,c=1.1399(2)nm,α=107.284(16)°,β=91.58(2)°,γ=113.104(15)°.Each Tb(III)ion coordinated with six oxygen atoms and two nitrogen atoms.Five coordinated oxygen atoms on each Tb(III)ion were from five 1,4-bdc anions and the other one from coordination water molecule.Each phen ligand coordinatied one Tb(III)ion by chelating way and supplied two coordination nitrogen atoms.The 1,4-bdc anions show three-and four-coordinated two coordination ways.The compound exhibits strong fluorescence under excitation of 325 nm ultraviolet light.The absolute quantum yield of photoluminescence is 36%(λex=325 nm)and the fluorescence lifetime of 5D 4 excited state is 0.638 ms.