Porous Phosphorescent Coordination Polymers for Oxygen Sensing

Abstract

Phosphorescent cyclometalated iridium tris(2-phenylpyridine) derivatives were designed and incorporated into coordination polymers as tricarboxylate bridging ligands. Three different crystalline coordination polymers were synthesized using a solvothermal technique and were characterized using a variety of methods, including single-crystal X-ray diffraction, PXRD, TGA, IR spectroscopy, gas adsorption measurements, and luminescence measurements. The coordination polymer built from Ir[3-(2-pyridyl)benzoate](3), 1, was found to be highly porous with a nitrogen BET surface area of 764 m(2)/g, whereas the coordination polymers built from Ir[4-(2-pyridyl)benzoate](3), 2 and 3, were nonporous. The (3)MLCT phosphorescence of each of the three coordination polymers was quenched in the presence of O(2). However, only 1 showed quick and reversible luminescence quenching by oxygen, whereas 2 and 3 exhibited gradual and irreversible luminescence quenching by oxygen. The high permanent porosity of 1 allows for rapid diffusion of oxygen through the open channels, leading to efficient and reversible quenching of the (3)MLCT phosphorescence. This work highlights the opportunity of designing highly porous and luminescent coordination polymers for sensing other important analytes.

Preparation of a Magnetic Metal Organic Framework Composite and Its Application for the Detection of Methyl Parathion

“…Recent developments regarding MOF have advanced very quickly because of its intriguing structure and potential applications, which include use in gas storage, purification, catalysis, sensing, adsorption and drug delivery. [2][3][4][5][6][7] Composites have combined the performances of MOF and other materials. A hybrid composite of multiwalled carbon nanotubes and MOF-5 was synthesized and the hydrostability and hydrogen storage capacity was enhanced.…”

Rationally tuned micropores within enantiopure metal-organic frameworks for highly selective separation of acetylene and ethylene

“…The pores within porous MOFs, particularly those within isoreticular MOFs whose structures are pre-determined by the coordination geometries of the secondary building blocks, can be systematically modified by changing the organic bridging linkers and controlling the framework interpenetration [2][3][4][5] . Furthermore, the pore surfaces of porous MOFs can be functionalized by the immobilization of different recognition sites, such as open metal sites, Lewis basic/acidic sites and chiral pockets, to direct the recognition of small molecules [6][7][8][9][10][11][12][13][14] . Systematically tuning micropores can achieve size-specific encapsulation of small gas molecules, and immobilization of functional sites enables varying substrate interactions: microporous MOF materials have emerged as promising microporous media for the recognition and separation of small molecules [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] .…”

Studies on oligomeric metal complexes derived from 2,5-bis((1H-1,2,4-triazol-3-yl)carbamoyl)terephthalic acid

“…[1][2][3][4] Numerous polymer-metal complexes have been reported not only because of their intriguing variety of architectures and topologies [5][6][7] but also for their properties of high porosity and enormous internal surface areas. [8,9] These properties have potential applications in clean energy, such as storage media for methane, hydrogen, and acetylene [10,11] or as absorbents or membrane fillers in separation and purifications of chemicals. [12,13] Polymer-metal complexes can be used in catalysis, magnetism, luminosity, and chemical sensors.…”