Temperature-dependent assemblies from a 2-D triple-stranded meso-helical layer to a 3-D chain-layer metal–organic framework

2012 ◽  
Vol 41 (47) ◽  
pp. 14239 ◽  
Author(s):  
Hong-Guang Jin ◽  
Xu-Jia Hong ◽  
Jing Li ◽  
Yuan-Zhao Yan ◽  
Yi-Ting Liu ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Temperature Dependent ◽  
Metal Organic ◽  
Organic Framework

Revealing an unusual temperature-dependent CO2 adsorption trend and selective CO2 uptake over water vapors in a polyamine-appended metal–organic framework

2019 ◽  
Vol 3 (12) ◽  
pp. 2759-2767 ◽  
Author(s):  
Jong Hyeak Choe ◽  
Dong Won Kang ◽  
Minjung Kang ◽  
Hyojin Kim ◽  
Jeoung Ryul Park ◽  
...  
Keyword(s):  
Co2 Adsorption ◽  
Selective Adsorption ◽  
Metal Organic Framework ◽  
Co2 Uptake ◽  
Temperature Dependent ◽  
Water Vapors ◽  
Metal Organic ◽  
Adsorption Of Co ◽  
Unusual Increase ◽  
Organic Framework

Heavily tetraethylenepentamine (tepa)-functionalized Mg2(dobpdc) showed an unusual increase in CO2 uptake on increasing the temperature and selective adsorption of CO2 over water vapors.

scholarly journals Temperature-dependent interchromophoric interaction in a fluorescent pyrene-based metal–organic framework

2019 ◽  
Vol 10 (24) ◽  
pp. 6140-6148 ◽  
Author(s):  
Andrzej Gładysiak ◽  
Tu N. Nguyen ◽  
Richard Bounds ◽  
Anna Zacharia ◽  
Grigorios Itskos ◽  
...  
Keyword(s):  
Variable Temperature ◽  
Metal Organic Framework ◽  
Temperature Dependent ◽  
Fluorescent Emission ◽  
Metal Organic ◽  
Organic Framework

Variable temperature experiments revealed that the fluorescent emission colour of the pyrene-based SION-7 changes from blue at 80 K to yellow-green at 450 K.

scholarly journals Framework disorder and its effect on selective hysteretic sorption of a T-shaped azole-based metal–organic framework

IUCrJ ◽  
2019 ◽  
Vol 6 (1) ◽  
pp. 85-95 ◽  
Author(s):  
Sujuan Wang ◽  
Zhang-Wen Wei ◽  
Jianyong Zhang ◽  
Long Jiang ◽  
Dingxin Liu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Structural Disorder ◽  
Gas Sorption ◽  
Temperature Dependent ◽  
Disordered Structure ◽  
Metal Organic ◽  
First Time ◽  
Organic Framework

Metal–organic frameworks with highly ordered porosity have been studied extensively. In this paper, the effect of framework (pore) disorder on the gas sorption of azole-based isoreticular Cu(II) MOFs with rtl topology and characteristic 1D tubular pore channels is investigated for the first time. In contrast to other isoreticular rtl metal–organic frameworks, the Cu(II) metal–organic framework based on 5-(1H-imidazol-1-yl)isophthalate acid has a crystallographically identifiable disordered framework without open N-donor sites. The framework provides a unique example for investigating the effect of pore disorder on gas sorption that can be systematically evaluated. It exhibits remarkable temperature-dependent hysteretic CO2 sorption up to room temperature, and shows selectivity of CO2 over H2, CH4 and N2 at ambient temperature. The unique property of the framework is its disordered structure featuring distorted 1D tubular channels and DMF-guest-remediated defects. The results imply that structural disorder (defects) may play an important role in the modification of the performance of the material.

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

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 523 ◽  
Author(s):  
Despoina Andriotou ◽  
Stavros A. Diamantis ◽  
Anna Zacharia ◽  
Grigorios Itskos ◽  
Nikos Panagiotou ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Metal Organic Framework ◽  
Lanthanide Ions ◽  
Temperature Dependent ◽  
Dual Emission ◽  
Bridging Ligands ◽  
Color Tuning ◽  
Metal Organic ◽  
Lanthanide Metal ◽  
Organic Framework

In this study, we report the luminescence color tuning in the lanthanide metal-organic framework (LnMOF) ([La(bpdc)Cl(DMF)] (1); bpdc2− = [1,1′-biphenyl]-4,4′-dicarboxylate, DMF = N,N-dimethylformamide) by introducing dual emission properties in a La3+ MOF scaffold through doping with the blue fluorescent 2,2′-diamino-[1,1′-biphenyl]-4,4′-dicarboxylate (dabpdc2−) and the red emissive Eu3+. 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 (1) and its doped counterparts with various dabpdc2−/bpdc2− and Eu3+/La3+ ratios and the photoinduced energy transfer pathways that are possible within these materials are discussed. Finally, the temperature dependence study on the emission profile of a doped analogue containing 10% dabpdc2− and 2.5% Eu3+ (7) is presented, highlighting the potential of this family of materials to behave as temperature sensors.

scholarly journals A Low-Power MEMS IDE Capacitor with Integrated Microhotplate: Application as Methanol Sensor using a Metal-Organic Framework Coating as Affinity Layer

Sensors ◽  
2019 ◽  
Vol 19 (4) ◽  
pp. 888 ◽  
Author(s):  
Manjunath Venkatesh ◽  
Sumit Sachdeva ◽  
Brahim El Mansouri ◽  
Jia Wei ◽  
Andre Bossche ◽  
...  
Keyword(s):  
Low Power ◽  
Metal Organic Framework ◽  
Vapor Concentration ◽  
Temperature Dependent ◽  
Zeolitic Imidazolate Framework ◽  
Methanol Vapor ◽  
Silicon Nitride Membrane ◽  
Power Mems ◽  
Metal Organic ◽  
Organic Framework

Capacitors made of interdigitated electrodes (IDEs) as a transducer platform for the sensing of volatile organic compounds (VOCs) have advantages due to their lower power operation and fabrication using standard micro-fabrication techniques. Integrating a micro-electromechanical system (MEMS), such as a microhotplate with IDE capacitor, further allows study of the temperature- dependent sensing response of VOCs. In this paper, the design, fabrication, and characterization of a low-power MEMS microhotplate with IDE capacitor to study the temperature-dependent sensing response to methanol using Zeolitic imidazolate framework (ZIF-8), a class of metal-organic framework (MOF), is presented. A Titanium nitride (TiN) microhotplate with aluminum IDEs suspended on a silicon nitride membrane is fabricated and characterized. The power consumption of the ZIF-8 MOF-coated device at an operating temperature of 50 ∘ C is 4.5 mW and at 200 ∘ C it is 26 mW. A calibration methodology for the effects of temperature of the isolation layer between the microhotplate electrodes and the capacitor IDEs is developed. The device coated with ZIF-8 MOF shows a response to methanol in the concentration range of 500 ppm to 7000 ppm. The detection limit of the sensor for methanol vapor at 20 ∘ C is 100 ppm. In situ study of sensing properties of ZIF-8 MOF to methanol in the temperature range from 20 ∘ C to 50 ∘ C using the integrated microhotplate and IDE capacitor is presented. The kinetics of temperature-dependent adsorption and desorption of methanol by ZIF-8 MOF are fitted with double-exponential models. With the increase in temperature from 20 ∘ C to 50 ∘ C, the response time for sensing of methanol vapor concentration of 5000 ppm decreases by 28%, whereas the recovery time decreases by 70%.

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