Recent advancements of photo- and electro-active hydrogen-bonded organic frameworks

Abstract

The development of hydrogen-bonded organic frameworks (HOFs) with predictable topologies and robust structures for targeted functionality was initially hindered by the relatively weak H-bonding interactions as many HOFs would collapse upon guest solvent removal. Recently, the design of tectons with large π-conjugated systems that form intermolecular shape-fitted π-π stacking interactions has proven to be an effective strategy to create chemically and thermally stable HOFs. More importantly, these HOFs with large π-conjugated tectons exhibit accelerated redox hopping processes due to more favorable through-space orbital overlap interactions. These intrinsic photoelectric properties render HOFs an appealing and unique class of photoactive and electroactive porous materials for catalysis, sensing, and biomedical applications. Based on shape-fitted π-π stacking strategy, various robust photoactive and electroactive HOFs have been built from tectons containing both photosensitive or redox-active organic cores and hydrogen bonding sites. This review summarizes the recent advancements, including synthetic methods and diverse applications, in the development of photo-and electro-active HOFs. Considering the numerous photo-and electro-active organic units available, as well as the virtually unlimited potential combinations of organic cores and hydrogen bonding sites, we anticipate that this review will inspire scientists in a range of disciplines, ranging from porous materials to organic photoelectric materials and catalysis scientists, to further explore functional photo-and electro-active HOF materials.

Multifunctional Porous Hydrogen-Bonded Organic Frameworks: Current Status and Future Perspectives

“…In this context, a growing number of robust HOFs with permanent porosity has been synthesized, and HOFs may also be considered as raw precursors that can be combined with other functional materials to fabricate multifunctional composite materials. Of late, some excellent reviews about the synthesis and applications of HOFs were also reported. − In this Outlook, we would like to summarize the basic principles for the design and construction of robust HOFs. Emphasis was put on the discussion about recent impressive progress in the application of HOFs.…”

Latest progress in proton-conducting hydrogen-bonded organic frameworks

“…HOFs are widely used as emerging multifunctional substances in gas storage and separation, [67][68][69][70] molecular sensing, [71][72][73][74] heterogeneous catalysis, [75][76][77][78] biological applications, [79][80][81] photoluminescent materials, [82][83][84][85][86] proton conduction [87][88][89][90][91][92] and membranebased applications. [93][94][95][96] To date, although there have been some reviews on the preparation and application of HOFs, [97][98][99][100][101] reviews on proton conductivity are relatively rare. As far as we know, there is only one review on the proton conductivity of HOFs.…”

Visual Detection of Coumarin and Umbelliferone for Beverage Safety Based on Eu(III)‐Functionalized HOF Hybrids: Further Constructing an SVM‐Assisted Digital Anti‐Counterfeiting Platform

“…Benefiting from inherent features of hydrogen-bonding interactions, such as reversible, weak, and poorly directional, HOFs are endowed with the advantages of recyclability, flexibility, and structural diversity. [43][44][45] More importantly, the presence of unpaired and residual hydrogenbonding donor and acceptor groups in the HOFs structure enables the incorporation of functional species into their framework through the facile coordination post-synthetic modification (PSM) method. [46,47] These factors provide motivation for the development of Ln@HOFs material through the modification of HOFs with lanthanide ions.…”