Luminescent Functional Metal–Organic Frameworks

Abstract

Metal-organic frameworks (MOFs) or porous coordination polymers (PCPs) have been one of the most studied materials in recent past and efforts are continuing to uncover their fascinating properties at various levels like gas storage/separation, catalysis, sensing and drug delivery. One of the most intriguing phenomena observed in MOFs is stimuli responsive "dynamic behavior" which can arise either locally from flexible ligands and /or from the global cooperative movement of the frameworks that consequences selective capture or recognition of the specific molecule. Such flexible frameworks shows hysteretic and gated sorption profiles for selective adsobate molecules and also exhibit guest repsonive modulation of opto-electronic and magnetic properties. For example tuning of permanent porosity and modulation of magnetic properties by post-synthetic modification using light in a porous coordination polymer is yet to be accounted. Such synergism, where two different functionalities are combined, would open up the possibility and prospect of finding novel physical phenomena for designing new smart materials. This talk would try to explore some of these stiumuli responsive metal-organic framework systems and their different functionalities.

Silver-Based Hybrid Materials from meta- or para-Phosphonobenzoic Acid: Influence of the Topology on Silver Release in Water

“…As for the previous compound, the silver cations are surrounded by the four oxygen atoms of thefrom phosphonate functiongroups. The distance between the Ag + cations and the coordinating oxygen atoms range from 2.28 to 2.56 Å and are slight greater than the distances observed for (2). The observed distorted polyhedra are connected together via one edge to form…”

“…Compounds Ag3(4-PO3-C6H4-COO) (1), Ag(4-PO3H-C6H4-COOH) (2), and Ag(3-PO3H-C6H4-COOH) (3) were obtained by hydrothermal synthesis according to the following reproducible method. Although the synthesis of compound 4 was already described elsewhere by Hix et al 4139 we present here the conditions that achieved its synthesis according in a faster lower reaction temperature.…”

Photoluminescent Metal–Organic Frameworks for Gas Sensing

“…Over the past two decades, MOFs have attracted extensive interest for their great potential in many applications such as gas separation/storage,11, 12, 13, 14, 15, 16, 17 catalysis,18, 19, 20 drug delivery,21 and luminescence sensing 2, 3, 4, 22, 23. As for conventional metal complexes, photoluminescence properties of MOFs can be finely tuned by rational selection of metal ions and design of organic ligands.…”

“…In addition, luminescence can also be generated from guest chromophore or charge transfer between the host framework and guest molecules. The diversified luminescence mechanisms make MOFs a unique platform for various luminescence applications 2, 3, 4, 26, 27, 28, 29…”

“…Similar with common luminescent materials, the luminescence of MOFs can be influenced by many environmental factors,3, 4 including physical stimulus and chemical stimulus (ions,30, 31, 32, 33 solvents,34, 35, 36 vapors,37 pH,38, 39 gases,1 and so on40, 41, 42, 43, 44, 45). However, unlike other luminescent materials, the intrinsic porosity, large surface area, and strong adsorption affinity of MOFs can effectively enrich guest species.…”