Dual Emission in a Ligand and Metal Co-Doped Lanthanide-Organic Framework: Color Tuning and Temperature Dependent Luminescence.

In this study, we report the luminescence color tuning in the lanthanide metal-organic framework (LnMOF) ([La(bpdc)Cl(DMF)] (); bpdc = [1,1'-biphenyl]-4,4'-dicarboxylate, DMF = ,-dimethylformamide) by introducing dual emission properties in a La MOF scaffold through doping with the blue fluorescent 2,2'-diamino-[1,1'-biphenyl]-4,4'-dicarboxylate (dabpdc) and the red emissive Eu. With a careful adjustment of the relative doping levels of the lanthanide ions and bridging ligands, the color of the luminescence was modulated, while at the same time the photophysical characteristics of the two chromophores were retained. In addition, the photophysical properties of the parent MOF () and its doped counterparts with various dabpdc/bpdc and Eu/La ratios and the photoinduced energy transfer pathways that are possible within these materials are discussed.

Temperature-dependent interchromophoric interaction in a fluorescent pyrene-based metal-organic framework.

Compounds exhibiting tuneable fluorescence emission upon heating or cooling are considered smart materials as their optical properties can be exquisitely controlled by adjusting the external temperature. Herein, we report such a material, which is a porous pyrene-based metal-organic framework with a chemical formula of [Mg(HTBAPy)(HO)]·3DMF (HTBAPy = 1,3,6,8-tetrakis(-benzoic acid)pyrene), named . The bulk solid material of can display either monomer or excimer fluorescence emission due to the temperature-dependent extent of interchromophoric interactions between the HTBAPy ligands within the framework.

Selective, Fast-Response, and Regenerable Metal-Organic Framework for Sampling Excess Fluoride Levels in Drinking Water.

Prolonged consumption of water contaminated with fluoride ions (F) at concentrations exceeding 1.5 ppm can lead to considerable health implications, particularly in children and developing embryos. With irreversible and potentially severe forms of fluoride (F) toxicity such as skeletal fluorosis being endemic in at least 25 countries, constructing affordable, remote-access, reliable water-sampling methods for F contamination is an important goal.