There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

Crystalline metal-organic frameworks (MOFs) are formed by reticular synthesis, which creates strong bonds between inorganic and organic units. Careful selection of MOF constituents can yield crystals of ultrahigh porosity and high thermal and chemical stability. These characteristics allow the interior of MOFs to be chemically altered for use in gas separation, gas storage, and catalysis, among other applications. The precision commonly exercised in their chemical modification and the ability to expand their metrics without changing the underlying topology have not been achieved with other solids. MOFs whose chemical composition and shape of building units can be multiply varied within a particular structure already exist and may lead to materials that offer a synergistic combination of properties.

The Chemistry and Applications of Metal-Organic Frameworks

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

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).

Selective gas adsorption and separation in metal–organic frameworks

Metal–organic frameworks (MOFs), which consist of metal ions or clusters and organic bridging ligands, have recently emerged as an important family of porous materials. In this comment, we discuss the current state of the field pertaining to MOFs with pore sizes between 2 and 50 nm, which have great application potential in gas storage, separation, sensor, catalysis, and drug delivery. This review will cover mesoporous MOFs containing 3-D channels, 1-D channels, and large cavities, as well as those based on supramolecular templates.

Recent Advances in the Study of Mesoporous Metal—Organic Frameworks

Metal—Organic Frameworks

https://onlinelibrary.wiley.com/doi/pdf/10.1002/ange.201606587

Innenrücktitelbild: Flexible Zirconium Metal-Organic Frameworks as Bioinspired Switchable Catalysts (Angew. Chem. 36/2016)

Porous coordination polymers (PCPs), also known as metal-organic frameworks (MOFs), are a unique family of porous materials that combine the benefits of both inorganic and organic components to afford an immense amount of diversity for structures and applications. Here we will discuss some of the terminology and representative examples, with a large focus on the contribution of MOFs. In addition, we will put forth examples that involve the diverse range of their applications in areas such gas storage, gas separation, catalysis, sensing, magnetism, and florescence. The aim, in this article, is to review the significant history and tremendous development of MOFs in the past quarter century. The introduction of this extraordinary field will hopefully help readers to grasp the fundamentals and versatility of this upincoming area of science and technology.


Keywords:

porous coordination polymer;
organic framework;
porous materials;
gas storage

Recent Advances in Porous Coordination Polymers

The phosphorus chemical shift anisotropies, 31 PΔcs, and asymmetry parameters η were measured by the 31 P{1 H} NMR experiments in static and low-frequency spinning samples of the zirconium phosphates and phosphonates and also in the mixed Zr (IV)/Sn (IV) phosphate/phosphonate material. The data obtained have shown a 111 connectivity in the HPO4 and PO3 groups, which does not change at modification and intercalation of the materials. The 31 PΔcs values of the phosphonate groups (43-49 ppm) significantly surpass the values characterizing the HPO4 groups (23-37 ppm). The 31 P Δcs values obtained for the metal (IV) phosphates were discussed in terms of P-O distances. The 31 P chemical shift anisotropy parameters can help at elucidation of local structures in phosphate and phosphonate materials.

On Phosphorus Chemical Shift Anisotropy in Metal (IV) Phosphates and Phosphonates: a 31 P NMR Experimental Study.

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