Metal Hydrogen-Bonded Organic Framework as a pH Sensor for the Detection of Strong Acids

Abstract

pH detection is related to human beings' life closely. Herein, a porous metal hydrogen-bonded organic framework (MHOF) Co-CDI-CO 3 2− was designed and synthesized, which could be utilized to detect the pH values of strong acids. The sensitivity of pH detection was in the range of pH 2.0− 2.4 with an accuracy of 0.1, which mainly depended on the different degree of crystal surface damage. The MHOF Co-CDI-CO 3 2− had potential applications with the advantages of low cost, easy storage, and great sensitivity for pH detection as a pH sensor.

Water-Tolerant Hydrogen-Bonded Organic Framework Based on Phenylbis(benzimidazol-2-yl)methanol: Synthesis, Structural Characterization, and Organic-Vapor-Adsorption Properties

“…The crystal structures of the desolvated form are shown in Figure 3a 5) Å (not restrained)), to the sixmembered rings (2.61(5) and 2.83(5) Å; Figure 4a) and the angles formed by the N−H bond and the line perpendicular to the six-membered rings from the hydrogen atom (134(3)°and 108(3)°; Figure 4a) are within the range previously reported for several organic crystals that have been reported to form weak N−H•••π interactions (2.35(2)−3.01(5) Å, average 2.66 (22); 107(3)−166.32(18)°, average 143(18)°). 50−60 We also performed a Hirshfeld surface analysis for the surface of the NH site using CrystalExplorer.…”

“…Nonporous D-based HOFs exhibit proton-conductivity properties, while a porous E-based HOF exhibits pH-sensing properties. 21,22 Moreover, the halide salts of cationic benzimidazole-coordinated Re 6 cluster F form HOFs with porosity and luminescent properties. 23 We have reported HOFs based on imidazole-based building blocks G and H. 24,25 The G-based HOF can adsorb the organic vapors of small carbonyl compounds, ethers, and chloroalkanes, while the HOF based on H exhibits guestexchange properties that are accompanied by structural changes.…”

Magnetic and Porous Regulation in Cobalt(II) Hydrogen-Bonded Organic Framework via Supramolecular Isomerism

“…Notably, incorporating inorganic moieties offers an alternative approach to enhance stability and introduce new functions to HOFs. To this end, metalo hydrogen-bonded organic–inorganic frameworks (MHOFs) have emerged as a significant subclass of HOFs. − For instance, magnetic MHOFs has gained attention as a new type of single-ion magnets (SIMs), which exhibit magnetic bistability at the single-molecule level. , Despite numerous reports on SIMs and HOFs, magnetic MHOFs with slow magnetic relaxation behavior remain exceedingly rare. ,,, The combination of SIMs and HOFs, termed as SIM-HOFs, potentially provides a novel way to regulate the magnetic behavior of these complexes by taking advantage of HOF’s unique characteristics.…”

Metal Hydrogen-Bonded Organic Frameworks as Open Lewis Acid Catalysts for Two Types of CO2 Transformations

“…Consequently, the design and construction of a structurally flexible organic framework with multiple open Lewis acid sites holds great promise for improving substrate–catalyst interactions, thereby achieving efficient and versatile conversions of CO 2 . Metal hydrogen-bonded organic frameworks (M-HOFs) represent an emerging class of materials formed by linking metal complexes through hydrogen bonds. , These materials combine the advantages of MOFs and HOFs, preserving the catalytic centers of MOFs while incorporating the flexible structures of HOFs. , Thus, M-HOFs appear to be highly promising candidates for efficient multiple CO 2 conversions, yet their application in this domain remains unexplored. Considering that most existing M-HOFs, which are composed of simple complexes linked by hydrogen bonds, often exhibit low stability, it becomes imperative to focus on designing and constructing stable M-HOFs for their efficient utilization in catalyzing multiple CO 2 conversions. , …”