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

Two-photon excitation provides a means of activating chemical or physical processes with high spatial resolution in three dimensions and has made possible the development of three-dimensional fluorescence imaging, optical data storage, and lithographic microfabrication. These applications take advantage of the fact that the two-photon absorption probability depends quadratically on intensity, so under tight-focusing conditions, the absorption is confined at the focus to a volume of order λ3 (where λ is the laser wavelength). Any subsequent process, such as fluorescence or a photoinduced chemical reaction, is also localized in this small volume. Although three-dimensional data storage and microfabrication have been illustrated using two-photon-initiated polymerization of resins incorporating conventional ultraviolet-absorbing initiators, such photopolymer systems exhibit low photosensitivity as the initiators have small two-photon absorption cross-sections (δ). Consequently, this approach requires high laser power, and its widespread use remains impractical. Here we report on a class of π;-conjugated compounds that exhibit large δ (as high as 1, 250 × 10−50 cm4 s per photon) and enhanced two-photon sensitivity relative to ultraviolet initiators. Two-photon excitable resins based on these new initiators have been developed and used to demonstrate a scheme for three-dimensional data storage which permits fluorescent and refractive read-out, and the fabrication of three-dimensional micro-optical and micromechanical structures, including photonic-bandgap-type structures.

Two-photon polymerization initiators for three-dimensional optical data storage and microfabrication

Metal–organic frameworks (MOFs) have received a lot of attention because of their diverse structures, tunable properties and multiple applications such as gas storage, catalysis and magnetism. Recently, there has been a rapidly growing interest in developing MOF-based materials for electrochemical energy storage. MOFs have proved to be particularly suitable for electrochemical applications because of their tunable chemical composition that can be designed at the molecular level and their highly porous framework in which fast mass transportation of the related species is favorable. In this review, the recent progress in fabricating MOFs and MOF-derived nanostructures for electrochemical applications is presented. The review starts with an introduction of the principles and strategies for designing targeted MOFs followed by a discussion of some novel MOF-derived structures and their potential applications in electrochemical energy storage and conversion. Finally, major challenges in electrochemical energy storage are highlighted and prospective solutions from current progress in MOF-based nanostructure research are given.

Metal–organic frameworks and their derived nanostructures for electrochemical energy storage and conversion

Nanographenes, or extended polycyclic aromatic hydrocarbons, have been attracting renewed and more widespread attention since the first experimental demonstration of graphene in 2004. However, the atomically precise fabrication of nanographenes has thus far been achieved only through synthetic organic chemistry. The precise synthesis of quasi-zero-dimensional nanographenes, i.e. graphene molecules, has witnessed rapid developments over the past few years, and these developments can be summarized in four categories: (1) non-conventional methods, (2) structures incorporating seven- or eight-membered rings, (3) selective heteroatom doping, and (4) direct edge functionalization. On the other hand, one-dimensional extension of the graphene molecules leads to the formation of graphene nanoribbons (GNRs) with high aspect ratios. The synthesis of structurally well-defined GNRs has been achieved by extending nanographene synthesis to longitudinally extended polymeric systems. Access to GNRs thus becomes possible through the solution-mediated or surface-assisted cyclodehydrogenation, or “graphitization,” of tailor-made polyphenylene precursors. In this review, we describe recent progress in the “bottom-up” chemical syntheses of structurally well-defined nanographenes, namely graphene molecules and GNRs.

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New advances in nanographene chemistry

Magnetic materials and nanostructures based on carbon offer unique opportunities for future technological applications such as spintronics. This paper reviews graphene-derived systems in which magnetic correlations emerge as a result of reduced dimensions, disorder and other possible scenarios. In particular, zero-dimensional graphene nanofragments, one-dimensional graphene nanoribbons and defect-induced magnetism in graphene and graphite are covered. Possible physical mechanisms of the emergence of magnetism in these systems are illustrated with the help of computational examples based on simple model Hamiltonians. In addition, this review covers spin-transport properties, proposed designs of graphene-based spintronic devices, magnetic ordering at finite temperatures as well as the most recent experimental achievements.

https://iopscience.iop.org/article/10.1088/0034-4885/73/5/056501/pdf

Emergence of magnetism in graphene materials and nanostructures

A six-stage amphoteric redox hydrocarbon radical 3• containing three phenalenyl units was prepared. Cyclic voltammogram of 3• exhibits six reversible redox waves with a small numerical sum (E1sum) ...

4,7,11,14,18,21‐Hexa‐t‐butyltribenzodecacyclenyl Radical: A Six‐Stage Amphoteric Redox System.

The hybrid density functional theory calculations are applied to the elucidation of the relationship between the spin state and the second hyperpolarizabilities (γ) of diradical molecules, singlet and triplet zethrenes. The longitudinal γ values of singlet zethrenes with intermediate diradical character are found to be significantly reduced in the triplet state due to the Pauli principle, while the feature is reduced when increasing the length of middle ring regions, i.e., when increasing the diradical character.

Spin State Dependence of Second Hyperpolarizabilities of Zethrenes

The third‐order nonlinear optical (NLO) properties of open‐shell singlet molecular systems are investigated using model and real molecular systems by the ab initio molecular orbital (MO) and density functional theory (DFT) approaches. The diradical character dependence of the second hyperpolarizability (γ)—the microscopic origin of the third‐order NLO properties—is elucidated as well as its spin state dependence: γ values for the singlet systems with intermediate diradical character are remarkably enhanced as compared to those of closed‐shell and pure diradical systems, and the γ values for intermediate diradical systems are significantly reduced by changing from singlet to triplet state. Such features are exemplified by two‐site diradical model systems, diphenalenyl diradicaloids, and nanographenes. The γ values of multi‐radical systems including one‐dimensional diphenalenyl diradical clusters are also examined, while the intermolecular interaction effects and the size dependence of γ per unit are discus...

Third‐Order Nonlinear Optical Properties of Open‐Shell Systems: Diradical Character and Spin State Dependences

Experimental Consideration of Covalent Bonding Interactions in Stacks of Singlet Biradicals Having Kekule Structures

Efficiency of photon upconversion (UC) from near infrared (NIR) to visible emission by the triplet-triplet annihilation (TTA) mechanism in solid has been limited to be low in spite of its...

Takashi Kubo

Papers

4,7,11,14,18,21‐Hexa‐t‐butyltribenzodecacyclenyl Radical: A Six‐Stage Amphoteric Redox System.

Spin State Dependence of Second Hyperpolarizabilities of Zethrenes

Third‐Order Nonlinear Optical Properties of Open‐Shell Systems: Diradical Character and Spin State Dependences

Experimental Consideration of Covalent Bonding Interactions in Stacks of Singlet Biradicals Having Kekule Structures

Enhancing NIR-to-visible photon upconversion in cast solid by introducing bulky substituents in rubrene and by suppressing back energy transfer