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

J. Appl. Cryst.の発刊に際して

The long-standing challenge of designing and constructing new crystalline solid-state materials from molecular building blocks is just beginning to be addressed with success. A conceptual approach that requires the use of secondary building units to direct the assembly of ordered frameworks epitomizes this process: we call this approach reticular synthesis. This chemistry has yielded materials designed to have predetermined structures, compositions and properties. In particular, highly porous frameworks held together by strong metal-oxygen-carbon bonds and with exceptionally large surface area and capacity for gas storage have been prepared and their pore metrics systematically varied and functionalized.

/pdf/reticular-synthesis-and-the-design-of-new-materials-lazbx7tdux.pdf

Reticular synthesis and the design of new materials

https://chemistry-europe.onlinelibrary.wiley.com/doi/pdf/10.1002/cplu.201500363

Cover Picture: High CO2/CH4 Selectivity of a Flexible Copper(II) Porous Coordination Polymer under Humid Conditions (ChemPlusChem 10/2015)

Chiral recognition of α-amino esters was examined using the homochiral helical dimer of the zinc complex of linear tetrapyrrole (zinc bilinone) as a host. 1H NMR and thermodynamic studies indicated that favorable (Phe–Ome and Leu–Ome) or unfavorable (Asp–(Ome)2) interactions of the side chain of α-amino esters with zinc bilinone lead to enantioselectivity.

Chiral Recognition of α-Amino Esters on the Chiral Helical Surface of Zinc Bilinone

Cover Picture: Angew. Chem. Int. Ed. 4/2003

Bilindiones and biladienones carrying aryl groups at the meso positions were prepared using coupled oxidation reactions of iron tetraarylporphyrins in 20–63% yield.

A Facile and Versatile Preparation of Bilindiones and Biladienones from Tetraarylporphyrins.

The stereochemistry of the title compound, C 6 H 6 S 6 , was determined to have meso geometry. The molecule has C i symmetry with a dihedral angle around the disulfide moiety of -64.25(10)°, a reduction from the normal strain-free geometry (ca 90°) of the disulfide.

Susumu Kitagawa

Papers

Cover Picture: High CO2/CH4 Selectivity of a Flexible Copper(II) Porous Coordination Polymer under Humid Conditions (ChemPlusChem 10/2015)

Chiral Recognition of α-Amino Esters on the Chiral Helical Surface of Zinc Bilinone

Cover Picture: Angew. Chem. Int. Ed. 4/2003

A Facile and Versatile Preparation of Bilindiones and Biladienones from Tetraarylporphyrins.

meso-3,3'-Bi(1,2,4-trithiacyclohex-5-enyl)