为考查槲皮素(Quercetin,Q)作为荧光探针对金属离子的识别作用,实验用甲醇-PBS(1：99,V/V,pH= 7.40)缓冲溶液将槲皮素配成浓度为1.0 × 10-5 mol·L-1的溶液,向其中加入不同金属离子,测量加入金属离子前后荧光强度的变化.结果显示,槲皮素对铜离子具有较高的选择性(Fig.1),表现为荧光淬灭.
H2L(结构如下图所示)是一种基于喹唑啉衍生物的荧光传感器,在 DMSO/H2O(1∶1,v/v)体系中,它对Cu2+具有on-off荧光响应.与铜离子的结合常数可达9.56×103 M-2,检出限为4.1×10-6 M.
本文通过合成了五个新的Ln-MOFs：{[Ln(NNO)(MA)(H2O)3]·2H2O}n(Ln = Eu 1,Tb 2,Sm 3,Dy 4,Gd5；HNNO = N-氧化烟酸； H2MA=丙二酸).研究了配合物1 和2 的荧光性质并研究了配体与Ln3+间的能量传递机理,结果表明配体HNNO 的三重态能级与Tb3+的振动能级匹配.配合物1 和2 的5D0(Eu3+)和5D4(Tb3+)的荧光寿命
Y3+-doped Ba0.9AlSi0.6O3.4N0.6∶0.1Eu2+green-emitting phosphors have been prepared under N2/H2 or ammonia via a solid state reaction method.The luminescence properties,structure and morphology of the s
Amines are a very important family of compounds for many uses such as synthetic intermediates,pharmaceuticals,agrochemicals,and bulk chemicals.The alkylation of amines is usually achieved by a substit
The quantum calculations based on density functional theory(DFT)have been carried out to investigate the relationship between redox properties and second-order nonlinear optical(NLO)responses of Keggi
Hierarchical zeolites are useful solid catalysts for conversion of bulky molecules because they offer fast mass transfer along with size and shape selectivity.
The microbial transformation of dinitrogen to biologic available form such as ammonium is called biological nitrogen fixation(BNF),which is mediated by nitrogenase.The FeMo-cofactor is believed to be
采用水热法在酸/醇混合液中制备了立方相ZrW2O8∶Eu3+红色荧光粉(60 nm,纳米棒)。研究了不同Eu3+掺杂浓度对样品的物相及发光性能的影响,发现在一定浓度范围内Eu3+的最佳掺杂浓度为9 mol％。结合低温光谱和基质晶体结构分析得出Eu3+进入ZrW2O8 晶格中并取代Zr4+的位置,占据无反演中心的C1 点群。
In the present study,we used 1-nitroso-2-naphthol as adsorbent to enrich and recover the uranyl carbonate complex anion from Uranium hexafluoride alkali adsorption solution.