Unusually Flexible Indium(III) Metal-Organic Polyhedra Materials for Detecting Trace Amounts of Water in Organic Solvents and High Proton Conductivity.

Title Unusually Flexible Indium(III) Metal-Organic Polyhedra Materials for Detecting Trace Amounts of Water in Organic Solvents and High Proton Conductivity.
Authors X. Du; R. Fan; L. Qiang; Y. Song; K. Xing; W. Chen; P. Wang; Y. Yang
Journal Inorg Chem
DOI 10.1021/acs.inorgchem.6b02963
Abstract

Humidity-induced single-crystal transformation was observed in the indium metal-organic polyhedra [In2(TCPB)2]·2H2O (In1), where H3TCPB is 1,3,5-tri(4-carboxyphenoxy)benzene. When the humidity is above 58% relative humidity (RH) at room temperature, the neutral compound In1 could be successfully converted into the positively charged compound In1-H along with the color change from yellow to deep red, which also undergoes a reversible transformation into In1 driven by thermal dehydration. Notably, the color of In1 takes only 5 min to change under 58% RH at room temperature, which is much quicker than common desiccant bluestone. As the water content is increased from 0.0% to 0.2% in acetonitrile solvent, compound In1 exhibits rapid detection of trace amounts of water through turn-off luminescence sensing mechanism with a low detection limit of 2.95 × 10(-4)%. Because of the formation of extensive hydrogen-bonding network between the metal-organic polyhedra (MOPs) and surrounding guest OH(-) ions, compound In1-H, along with isostructural Ga1-H, displays excellent proton conductivity up to 2.84 × 10(-4) and 2.26 × 10(-4) S cm(-1) at 298 K and 98% RH, respectively. Furthermore, the activation energies are found to be 0.28 eV for In1-H and 0.34 eV for Ga1-H. This method of incorporation of OH(-) ions to obtain high proton conductivity MOPs with low activation energy demonstrates the advantage of OH(-) ion conduction in the solid-state materials.

Citation X. Du; R. Fan; L. Qiang; Y. Song; K. Xing; W. Chen; P. Wang; Y. Yang.Unusually Flexible Indium(III) Metal-Organic Polyhedra Materials for Detecting Trace Amounts of Water in Organic Solvents and High Proton Conductivity.. Inorg Chem. 2017. doi:10.1021/acs.inorgchem.6b02963

Related Elements

Indium

See more Indium products. Indium (atomic symbol: In, atomic number: 49) is a Block P, Group 13, Period 5 element with an atomic weight of 114.818. The number of electrons in each of indium's shells is [2, 8, 18, 18, 3] and its electron configuration is [Kr] 4d10 5s2 5p1. The indium atom has a radius of 162.6 pm and a Van der Waals radius of 193 pm. Indium was discovered by Ferdinand Reich and Hieronymous Theodor Richter in 1863. Indium Bohr ModelIt is a relatively rare, extremely soft metal is a lustrous silvery gray and is both malleable and easily fusible. It has similar chemical properties to Elemental Indiumgallium such as a low melting point and the ability to wet glass. Fields such as optics and microelectronics that utilize semiconductor technology have wide uses for indium, especially in the form of Indiun Tin Oxide (ITO). Thin films of Copper Indium Gallium Selenide (CIGS) are used in high-performing solar cells. Indium's name is derived from the Latin word indicum, meaning violet.

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