1 引言
2 结果与讨论
2.1 物理表征分析
图1 NKM-456-Eu的晶体结构图. (a) Eu3+配位方式; (b) 8-连接HPA-2Me8−配体片段和(c)沿c轴观察的NKM-456-Eu三维框架结构Figure 1 Schematic illustration of the structure of NKM-456-Eu. (a) Coordination environment of Eu3+; (b) 8-connected HPA-2Me8− fragment and (c) Crystal structure of NKM-456-Eu viewed along the c axis |
2.2 性能分析
图3 NKM-456-Eu在DEF溶液中的发光强度在(a)逐步加入1-HP及(b)不同浓度1-HP含量(0~1 mg/mL)时的变化情况; (c) NKM-456-Eu检测1-HP的即时响应性; (d) NKM-456-Eu对1-HP的检测抗干扰能力示意图Figure 3 Luminescence intensity of NKM-456-Eu in DEF solution with (a) stepwise addition of 1-HP or (b) different concentrations of 1-HP (0~1 mg/mL); (c) immediate response of NKM-456-Eu to 1-HP detection and (d) schematic diagram of the anti-interference ability of NKM-456-Eu for 1-HP detection |
2.3 机理分析
图4 (a) NKM-456-Eu浸泡1-HP前后的荧光寿命图谱; (b) NKM-456-Eu浸泡1-HP后和1-HP的发射光谱; (c) DFT计算给出的1-HP和NKM-456-Eu配体HOMO和LUMO轨道Figure 4 (a) Fluorescence lifetime spectra of NKM-456-Eu before and after immersion in 1-HP; (b) Emission spectra of NKM-456-Eu after immersion in 1-HP and that of 1-HP; (c) DFT calculations of HOMO and LUMO orbitals of 1-HP and NKM-456-Eu |