Executive Summary : | Porous organic materials have attracted the attention of the organic frameworks due to the broad range of their applications. Among these materials, metal organic frameworks (MOFs), covalent organic frameworks (COFs) and hydrogen-bonded organic frameworks (HOFs) have shown great potential in diverse fields of modern science and technology like optoelectronics, nonlinear optics, chemical luminescent sensors, catalysis, selective gas sorption and energy conversion/storage devices, which can enable sustained and autonomous operation of electronic devices for applications like wearable gadgets and electronic devices. In comparison with the coordination and covalent bond in MOFs and COFs, the instability and low-directionality of hydrogen-bonding nature in HOFs are still the stumbling block to the establishment of permanent porosity and thus the development of diverse functions for this kind of materials. The H-bonding interaction of HOFs is much weaker and dynamic, providing HOFs with flexibility and unique features that are highly desirable for applications. The research on (HOFs) have been reported as an exciting new class of materials, which are constructed organic building blocks through H-bonding interactions. The resultant framework can be further reinforced via weak connections such as π-π, van der Waals, and/or C-H-π interactions. Most hydrogen-bonding interactions are essentially weak, easy regeneration, and low directional as compared with covalent and coordinate bonds in terms of bonding energies and angles. Hence, there is a scope to develop organic transition-metal compound of ferrocene-appended chromophores due to the redox reaction between the ferrocene (FeII) and ferrocenium (FeIII), with fast and reversible one electron transfer, which is responsible for effective inter/intramolecular charge transfer process in ferrocene to acceptor moieties. Second-order nonlinear optical properties to elaborate multifunctional materials, in particular when the HOFs switch between several forms. The central coplanar linkers featuring carboxylic acid motifs are promising in reticular construction of HOFs owing to the formation of firm H-bonding interactions and strong π−π packing interactions. This encourages us to investigate ferrocene-appended HOFs materials attract our interest because they are readily accessible and the hydrogen interaction between the carboxyl groups symmetry backbones can be easily predicted. HOFs always include some hydrogen-bonding building blocks and possess unique advantages, such as mild synthesis conditions required, solution processability, and easy regeneration in relation to MOF and COF. In order to mitigate this problem, focused recently on crystalline HOFs materials, are promising wearable electronics, selective gas (CO₂/CO) adsorption, textile electronics, biomedicine, molecular encapsulation, drug delivery, which combine light–weight, highly flexible, with high electrical conductivity and good flexibility. |