Wide Control of Proton Conductivity in Porous Coordination Polymers

Abstract

The proton conductivities of the porous coordination polymers M(OH)(bdc-R) [H(2)bdc = 1,4-benzenedicarboxylic acid; M = Al, Fe; R = H, NH(2), OH, (COOH)(2)] were investigated under humid conditions. Good correlations among pK(a), proton conductivity, and activation energy were observed. Fe(OH)(bdc-(COOH)(2)), having carboxy group and the lowest pK(a), showed the highest proton conductivity and the lowest activation energy in this system. This is the first example in which proton conductivity has been widely controlled by substitution of ligand functional groups in an isostructural series.

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

“…The importance of functional groups in conductive processes was experimentally confirmed in various amine-intercalated titanium(IV)-phosphate [139] and zirconium hydrogen phosphate [140][141][142] systems. Moreover, the dissociation of functional groups was identified as the governing step of charge carrier generation in proteins [95], acid functionalized SBA-15 [137] and metalorganic frameworks [143]. Conductivity increased with the increasing pK a of the surface functional groups and ion concentration was found to be the key parameter determining the conduction.…”

SCOPE OF VARIOUS SOLVENTS AND THEIR EFFECTS ON SOLVOTHERMAL SYNTHESIS OF Ni-BTC

“…[7][8][9][10] Due to their modular nature and structural tunability, application of MOFs has been widening in the fields of light harvesting, [11][12][13][14][15] sensing, 16 optical luminescence, 17,18 ionic conductivity, [19][20][21] nonlinear optical behavior 22 and as precursors for the synthesis of nanomaterials with interesting properties. [23][24][25][26][27][28][29] A huge variety of MOFs have been synthesized and reported so far with synthesis techniques such as hydrothermal, solvothermal, microwave assisted heating, mechanochemical, electrochemical and, more recently, ultrasonic processes.…”

Exploitation of Guest Accessible Aliphatic Amine Functionality of a Metal–Organic Framework for Selective Detection of 2,4,6-Trinitrophenol (TNP) in Water

“…32,35,[52][53][54][55][56] In this regard, instead of solubilization of the probe, water-stability is a unique feature exhibited by some of the new-generation functional materials like metal-organic frameworks (MOFs); [57][58][59][60] wherein the inherent porous franework remains unaffected in water, even after prolonged exposure for the specific waterstable MOFs. Apart from their well-recognized multifarious applications in the microporous domain; [61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78] MOFs have established themselves as excellent sensory materials because of the unmatched combination of crystallinity, permanent porosity, and designable pores with tailored window-sizes, systematically tunable band gaps and electronic structures. [79][80][81][82][83][84][85] In general, favourable interactions between target analyte and MOF backbone result into the observed PL-sensing performance for MOFs.…”