Dongwoo Kim

Bio: Dongwoo Kim is an academic researcher from Sungkyunkwan University. The author has contributed to research in topics: Nanocapsules & Etching (microfabrication). The author has an hindex of 19, co-authored 52 publications receiving 3440 citations. Previous affiliations of Dongwoo Kim include Pohang University of Science and Technology.

Microporous manganese formate: a simple metal-organic porous material with high framework stability and highly selective gas sorption properties.

Abstract: Novel microporous metal−organic framework material composed of Mn(II) and formate ions displays permanent porosity, high thermal stability, and size-selective gas sorption behavior. The framework is stable enough to maintain single crystallinity after the complete guest removal at 150 °C under a reduced pressure. Most importantly, it selectively adsorbs H2 and CO2 but not N2 and other gases with larger kinetic diameters, which appears to be due to the small aperture of the channels. Despite a moderate H2 storage capacity, which is however still higher than that of any zeolite, its H2 surface coverage is one of the highest among the known microporous materials. Thus this new zeolite-like material made of a simple organic building block may find useful applications in gas separation and sensor.

Functionalized cucurbiturils and their applications.

Abstract: Cucurbit[n]uril (CB[n], n = 5–10), a new family of molecular hosts comprising n glycoluril units, have gained much attention in the new millennium for their exceptional molecular recognition ability. The CB homologues have brought dynamism to CB chemistry, as witnessed by the heightened interest in the field for the last several years. Compared to the chemistry of cyclodextrins and calixarenes, however, that of CB[n] has developed slowly until recently, which may be attributed mainly to their poor solubility in common solvents, and inability to functionalize these molecules. The direct functionalization method of CB[n] propelled CB chemistry to a new height as this new method not only solved the solubility problem but also opened up the gateway to the generation of tailor-made CB[n] derivatives. The functionalization of CB[n] led us to investigate numerous applications including artificial ion channels, vesicles, stationary phases in chromatography, ISEs, polymers, nanomaterials, and many others. This tutorial review describes the recent advances and challenges in the functionalization of CBs along with the applications of functionalized CBs.

Metal-organic replica of fluorite built with an eight-connecting tetranuclear cadmium cluster and a tetrahedral four-connecting ligand.

Abstract: The last decade has seen remarkable progress in the development of new materials based on transition-metal ions and organic ligands, often termed as coordination polymers (networks) or metal–organic frameworks. Although this relatively new field of chemistry aims at the discovery and synthesis of new materials for practical applications emphasizing their functional aspects, it would be difficult to achieve a true advance without understanding the structural aspects of such materials at a molecular or an atomic resolution. Recent reviews on the framework topologies and other geometrical characteristics of network solids reflect this importance. As the number of infinite network structures based on molecular building blocks increases, it becomes easier to analyze and categorize their framework topologies. It appears that for the majority of 3D metal–organic framework structures, there are well-known prototypes in metallic or binary inorganic solids. For example, diamond-related nets composed of one or two kinds of tetrahedral nodes and linear linkers are the most common, and a primitive cubic net (a-Po) based on octahedral nodes with linear linkers is also frequently observed. Other 3D structures have recently been reported to have the following topologies: boracite, CdSO4, [5] CaB6, [6] feldspar, NbO, perovskite, Pt3O4, [10]

Selective gas adsorption and separation in metal–organic frameworks

Abstract: Adsorptive separation is very important in industry. Generally, the process uses porous solid materials such as zeolites, activated carbons, or silica gels as adsorbents. With an ever increasing need for a more efficient, energy-saving, and environmentally benign procedure for gas separation, adsorbents with tailored structures and tunable surface properties must be found. Metal–organic frameworks (MOFs), constructed by metal-containing nodes connected by organic bridges, are such a new type of porous materials. They are promising candidates as adsorbents for gas separations due to their large surface areas, adjustable pore sizes and controllable properties, as well as acceptable thermal stability. This critical review starts with a brief introduction to gas separation and purification based on selective adsorption, followed by a review of gas selective adsorption in rigid and flexible MOFs. Based on possible mechanisms, selective adsorptions observed in MOFs are classified, and primary relationships between adsorption properties and framework features are analyzed. As a specific example of tailor-made MOFs, mesh-adjustable molecular sieves are emphasized and the underlying working mechanism elucidated. In addition to the experimental aspect, theoretical investigations from adsorption equilibrium to diffusion dynamics via molecular simulations are also briefly reviewed. Furthermore, gas separations in MOFs, including the molecular sieving effect, kinetic separation, the quantum sieving effect for H2/D2 separation, and MOF-based membranes are also summarized (227 references).

Hydrogen storage in metal–organic frameworks

Abstract: New materials capable of storing hydrogen at high gravimetric and volumetric densities are required if hydrogen is to be widely employed as a clean alternative to hydrocarbon fuels in cars and other mobile applications. With exceptionally high surface areas and chemically-tunable structures, microporous metal–organic frameworks have recently emerged as some of the most promising candidate materials. In this critical review we provide an overview of the current status of hydrogen storage within such compounds. Particular emphasis is given to the relationships between structural features and the enthalpy of hydrogen adsorption, spectroscopic methods for probing framework–H2 interactions, and strategies for improving storage capacity (188 references).