| 1. |
- Andreasson, Joakim, 1973, et al.
(author)
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Storage and Processing of Information Using Molecules: The All-Photonic Approach with Simple and Multi-Photochromic Switches
- 2013
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In: Israel Journal of Chemistry. - : Wiley. - 0021-2148. ; 53:5, s. 236-246
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Research review (peer-reviewed)abstract
- The use of photochromes for the implementation of molecular logic operations is a very promising approach toward molecular computing. This statement is based on a) the possibility of operating such molecular devices exclusively with photonic signals and b) spatiotemporally and remotely controlled switching, which is characteristic for photochromes. Herein, a brief overview of the application of simple photochromes and multi-photochromic conjugates for the small-scale functional integration of complicated logic circuits is given. This complements and extends efforts to design molecular photochromic memories for data storage described by many research groups worldwide.
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| 2. |
- Jin, Jiayu, et al.
(author)
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Rational Design of Double-Check Mercury Ion Chemosensors Based on Photochromic Compounds
- 2013
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In: Israel Journal of Chemistry. - : Wiley. - 0021-2148. ; 53:5, s. 288-293
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Journal article (peer-reviewed)abstract
- A new photochromic compound, S1, containing a trans-cis photoisomerizable unit and a mercury detecting chemosensor unit, has been designed and synthesized. S1 displayed dramatic selectivity for mercury ions over other ions, through fluorescence intensity measurement. In addition, in the photostationary state, a colorimetric response to mercury ions was also achieved. The fluorescence turn-off of S1 by mercury ions was defined as the first check, while mercury-induced colorimetric variation in the photostationary state was set as the second check. Thus, a double-check mercury chemosensor can be achieved.
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| 3. |
- Jonsson, Mats
(author)
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An Overview of Interfacial Radiation Chemistry in Nuclear Technology
- 2014
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In: Israel Journal of Chemistry. - : Wiley. - 0021-2148. ; 54:3, s. 292-301
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Research review (peer-reviewed)abstract
- Interfacial radiation chemistry is of key importance in nuclear technology because most materials in the vicinity of radioactive materials in nuclear power plants, reprocessing plants, and repositories for nuclear waste are exposed to ionizing radiation. Corrosion is a crucial issue for the long-term performance and safety of these installations. Nevertheless, this field is still fairly undeveloped. In this paper, the current state of the art with particular focus on reactions between aqueous radiolysis products and metal or metal oxide surfaces is discussed. The general reactivity of hydrogen peroxide and the hydroxyl radical towards oxide surfaces is discussed on the basis of recent experimental results and DFT calculations. More specific discussions on radiation-induced surface processes in a future geological repository for spent nuclear fuel are given as relevant examples. This includes radiation-induced dissolution of spent nuclear fuel in contact with groundwater, radiation-induced corrosion of copper, and radiation-induced alterations of bentonite clay. Current knowledge gaps in these areas are highlighted.
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| 4. |
- Larsson, Per, et al.
(author)
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From Side Chains Rattling on Picoseconds to Ensemble Simulations of Protein Folding
- 2014
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In: Israel Journal of Chemistry. - : Wiley. - 0021-2148. ; 54:8-9, s. 1274-1285
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Research review (peer-reviewed)abstract
- Simulations of biological macromolecules have evolved tremendously since the discoveries of the 1970s. The field has moved from simple simulations in vacuo on picosecond scales to milliseconds of accurate sampling of large proteins, and it has become a standard tool in biochemistry and biophysics, rather than a dedicated theoretical one. This is partly due to increasing computational power, but it would not have been possible without huge research efforts invested in new algorithms and software. Here, we illustrate some of this development, both past and future challenges, and in particular, discuss how the recent introduction of modern ensemble methods is breaking the trend of ever-longer simulations to instead focus on throughput and sampling. This has not only helped simulations become much more accurate, but it provides statistical error estimates, which are critical, as simulations are increasingly used to predict properties that have not yet been measured experimentally.
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| 5. |
- Marcos, Rocio, et al.
(author)
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Combined Enzyme and Transition-Metal Catalysis for Dynamic Kinetic Resolutions
- 2012
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In: Israel Journal of Chemistry. - : Wiley. - 0021-2148. ; 52:7, s. 639-652
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Research review (peer-reviewed)abstract
- The preparation of optically pure alcohols, axially chiral allenes, and amine derivatives by using enzymes and transition-metal catalysts through dynamic kinetic resolution (DKR) is reviewed. After a general introduction into enzymatic kinetic resolutions and racemizations catalyzed by transition-metal complexes, selected examples of DKRs are presented, from early work to more recent outstanding contributions, and also applications of this approach.
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| 6. |
- Moberg, Christina, et al.
(author)
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Concepts in Asymmetric Catalysis
- 2012
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In: Israel Journal of Chemistry. - : Wiley. - 0021-2148. ; 52:7, s. 571-571
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Journal article (other academic/artistic)
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| 7. |
- Moberg, Christina
(author)
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The Role of Symmetry in Asymmetric Catalysis
- 2012
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In: Israel Journal of Chemistry. - : Wiley. - 0021-2148. ; 52:7, s. 653-662
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Research review (peer-reviewed)abstract
- Chiral ligands and metal complexes with rotational (Cn, Dn) symmetry often have beneficial properties in asymmetric catalysis. The enhanced enantioselectivity frequently observed is a result of a reduction of competing reaction routes. This may be due to rotational symmetry in the catalyst, leading to a limited number of different catalyst-substrate interactions, or to formation of a limited number of catalytic species as a result of rotational symmetry in the ligand. The effect of symmetry is usually difficult to evaluate, since a change in symmetry properties necessarily is accompanied by structural modifications. In each situation the number of intermediate complexes, their electronic and steric properties, and their energy need to be analyzed. Although other factors may be more important than symmetry for achieving high enantioselectivity, a vast number of C2- and to some extent C3-symmetric ligands have been found to have excellent properties in asymmetric catalysis, providing products with high enantiomeric purity. Besides the benefit of symmetry in the ligand and catalyst, the symmetry of the substrate may be important since a gain in enantioselectivity can result from simultaneous asymmetric transformations of homotopic functional groups.
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| 8. |
- Sakulsombat, Morakot, et al.
(author)
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A Dynamic Multicomponent Approach for One-Pot Synthesis of 3-Thioisoindolinones
- 2013
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In: Israel Journal of Chemistry. - : Wiley. - 0021-2148 .- 1869-5868. ; 53:1-2, s. 127-132
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Journal article (peer-reviewed)abstract
- A dynamic multicomponent reaction concept has been successfully applied to the syntheses of 3-thioisoindolinones and tricyclic gamma-lactams. The reactions were efficiently designed and operated in the absence of any catalyst under mild reaction conditions, resulting in the convenient variation of substituents on the N- and S-positions of the target products.
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| 9. |
- Solin, Niclas, et al.
(author)
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Protein Nanofibrils Balance Colours in Organic White-Light-Emitting Diodes
- 2012
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In: Israel Journal of Chemistry. - : Wiley-VCH Verlag Berlin. - 0021-2148. ; 52:6, s. 529-539
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Research review (peer-reviewed)abstract
- In this review we discuss our efforts in using protein nanowires (amyloid fibrils) as structural templates for use in organic electronics applications, mainly focusing on organic light-emitting diodes (OLEDs). We discuss different ways of functionalising amyloid fibrils. In one method, the amyloid fibril is used to organise luminescent polymers. We also discuss an alternative preparative method, resulting in amyloid-like materials functionalised with phosphorescent organometallic complexes. We discuss the incorporation of such materials in organic electronics devices, such as OLEDs. When amyloid fibrils are integrated into the OLED active layer, consisting of an electroluminescent blue-emitting polyfluorene, the efficiency of the device increases by a factor of 10. Furthermore, when amyloid fibrils incorporating phosphorescent metal complexes are used, the phosphorescent guest functions more efficiently than in the corresponding case where naked metal complexes are used. By preparing amyloid fibrils incorporating green- and red-emitting phosphorescent complexes, and combining these with blue-emitting polyfluorene, we can fabricate devices for white-light emission. The origin of the effects of the biomaterial on device performance is discussed.
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