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You searched for: Journal Chemical communications Remove constraint Journal: Chemical communications Publication Year 2008 Remove constraint Publication Year: 2008 Source 2008 no.42 Remove constraint Source: 2008 no.42
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1. A metallopolymer case-history: polymer, ring or ligand reaction?

Author:
Constable, Edwin C.; Harris, Kate; Housecroft, Catherine E.; Neuburger, Markus; Schaffner, Silvia
Source:
Chemical communications 2008 no.42 pp. 5360-5362
ISSN:
1364-548X
Subject:
alcohols; chemical reactions; cobalt; ligands; polymers
Abstract:
... Multinuclear cobalt(ii) complexes of ditopic ligands with α,ω-dioxy spacers linking two tpy metal-binding domains react with alcohols to generate monouclear 4′-alkoxy-species. ...
DOI:
10.1039/b811204e

2. An enzymatic kinetics investigation into the significantly enhanced activity of functionalized gold nanoparticles

Author:
Wu, Chung-Shu; Wu, Chia-Tien; Yang, Yuh-Shyong; Ko, Fu-Hsiang
Source:
Chemical communications 2008 no.42 pp. 5327-5329
ISSN:
1364-548X
Subject:
catalytic activity; chemical compounds; chemical reactions; enzyme substrates; nanogold; thermodynamics
Abstract:
... Kinetic and thermodynamic studies reveal that the property of significantly enhanced catalytic activity with colloidal stability is attributed to an efficacious means of tuning enzyme–substrate association by varying with the rate constants in the presence of functionalized gold nanoparticles. ...
DOI:
10.1039/b810889g

3. A non-oxide sol–gel route to synthesise silicon imidonitride monolithic gels and high surface area aerogels

Author:
Hassan, Shereen; Hector, Andrew L.; Hyde, Jason R.; Kalaji, Ali; Smith, David C.
Source:
Chemical communications 2008 no.42 pp. 5304-5306
ISSN:
1364-548X
Subject:
aerogels; amines; ammonia; chemical reactions; drying; silicon; solvents; surface area
Abstract:
... Monolithic gels have been produced by reaction of Si(NHMe)₄ with ammonia in THF solution and converted to high surface area aerogels by critical point drying with ammonia saturated diethylamine solvent. ...
DOI:
10.1039/b810317h

4. A novel type of N-formylation and related reactions of amines via cyanides and esters as formylating agents

Author:
Bao, Kai; Zhang, Weige; Bu, Xiujuan; Song, Zhichun; Zhang, Liang; Cheng, Maosheng
Source:
Chemical communications 2008 no.42 pp. 5429-5431
ISSN:
1364-548X
Subject:
amines; chemical reactions; cyanides; esters
Abstract:
... A novel N-formylation and related reactions proceed from cyanides promoted by esters. ...
DOI:
10.1039/b810086a

5. An unexpected ruthenium complex and its unique behavior as catalyst in dynamic kinetic resolution of secondary alcohols

Author:
Chen, Qihui; Yuan, Chengye
Source:
Chemical communications 2008 no.42 pp. 5333-5335
ISSN:
1364-548X
Subject:
alcohols; catalysts; catalytic activity; chemical reactions; moieties; ruthenium
Abstract:
... A ruthenium complex was accidentally synthesized and its unique catalytic behavior in dynamic kinetic resolution of various types of secondary alcohols, particularly for those bearing additional functional groups, is described. ...
DOI:
10.1039/b811627j

6. Aqueous-only, pH-induced nanoassembly of dual pKₐ-driven contraphilic block copolymers

Author:
Lee, Nam S.; Li, Yali; Ruda, C. Marcus; Wooley, Karen L.
Source:
Chemical communications 2008 no.42 pp. 5339-5341
ISSN:
1364-548X
Subject:
chemical reactions; composite polymers; nanomaterials
Abstract:
... pH-Responsive block copolymers, having two segments with functionalities of differing pKₐ, were prepared by NMP, providing a “green” route to the assembly of core–shell functionalizable nanostructures. ...
DOI:
10.1039/b810934f

7. A stable enol in small ring systems: clear differentiation between penta- and tri-valency of phosphorus atoms

Author:
Ionkin, Alex S.; Marshall, William J.; Fish, Brian M.; Schiffhauer, Matthew F.; McEwen, Charles N.
Source:
Chemical communications 2008 no.42 pp. 5432-5434
ISSN:
1364-548X
Subject:
chemical reactions; enols; hydrogen bonding; moieties; phosphorus
Abstract:
... The first stable enols in 1,2-dihydrophosphetes 6 and 10 were synthesized and structurally characterized with intermolecular hydrogen bonds to phosphoryl groups in 10-membered dimeric structures; in contrast, trivalent analogue 9 exists in keto-form, where such stabilization by hydrogen bonds is not feasible. ...
DOI:
10.1039/b809877h

8. Asymmetric 1,3-dipolar cycloaddition with a P-stereogenic dipolarophile: An efficient approach to novel P-stereogenic 1,2-diphosphine systems

Author:
Vinokurov, Nikolai; Pietrusiewicz, K. Michał; Frynas, Sławomir; Wiebcke, Michael; Butenschön, Holger
Source:
Chemical communications 2008 no.42 pp. 5408-5410
ISSN:
1364-548X
Subject:
chemical compounds; cycloaddition reactions; phosphorus; stereospecificity
Abstract:
... The asymmetric 1,3-dipolar cycloaddition of the P-stereogenic dipolarophile (SP,SP)-6 to C,N-diphenylnitrone (7) led to previously unknown P-stereogenic isoxazolinyl diphosphine dioxides (RP,SP)-8 in enantio- and diastereomerically pure form; their stereospecific reduction with Ti(OiPr)₄/PMHS proceeds in high yield with retention of configuration at the phosphorus atoms to give enantio- and diaste ...
DOI:
10.1039/b810573a

9. Binding enhancement of antigen-functionalized PEGylated gold nanoparticles onto antibody-immobilized surface by increasing the functionalized antigen using α-sulfanyl-ω-amino-PEG

Author:
Yoshimoto, Keitaro; Hoshino, Yuki; IshiiPresent address: Department of Bioengineering, School of Engineering, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, 113-8656, Tokyo, Japan., Takehiko; Nagasaki, Yukio
Source:
Chemical communications 2008 no.42 pp. 5369-5371
ISSN:
1364-548X
Subject:
antigens; chemical reactions; dissociation; nanogold; polyethylene glycol; surface plasmon resonance
Abstract:
... We established a technique for constructing PEGylated gold nanoparticles (GNP) that have small compounds with almost complete functionalities on their surfaces using a newly synthesized hetero-telechelic poly(ethylene glycol) (PEG), and their association/dissociation behavior on an antibody-immobilized surface was evaluated using a surface plasmon resonance (SPR) sensor. ...
DOI:
10.1039/b811818c

10. Coaxial electrospinning of microfibres with liquid crystal in the core

Author:
Lagerwall, Jan P. F.; McCann, Jesse T.; Formo, Eric; Scalia, Giusy; Xia, Younan
Source:
Chemical communications 2008 no.42 pp. 5420-5422
ISSN:
1364-548X
Subject:
chemical compounds; chemical reactions; liquid crystals
Abstract:
... Liquid crystal containing composite fibres were produced via coaxial electrospinning, demonstrating that this technique can be used for producing new functional fibres and/or to study the impact of extreme confinement on liquid crystal phases. ...
DOI:
10.1039/b810450f

11. Controllable synthesis of graphitic carbon nanostructures from ion-exchange resin-iron complex via solid-state pyrolysis process

Author:
Wang, Lei; Tian, Chungui; Wang, Baoli; Wang, Ruihong; Zhou, Wei; Fu, Honggang
Source:
Chemical communications 2008 no.42 pp. 5411-5413
ISSN:
1364-548X
Subject:
chemical compounds; graphene; ion exchange; nanocapsules; nanosheets; pyrolysis
Abstract:
... Graphitic carbon nanocapsules, nanosheets and nanoplates were selectively obtained via a solid-state pyrolysis route from various ion-exchange resin–iron complexes. ...
DOI:
10.1039/b810500f

12. Crystalline low band-gap alternating indolocarbazole and benzothiadiazole-cored oligothiophene copolymer for organic solar cell applications

Author:
Lu, Jianping; LiangCurrent address: Department of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun 130024, P. R. China, Fushun; Drolet, Nicolas; Ding, Jianfu; Tao, Ye; Movileanu, Raluca
Source:
Chemical communications 2008 no.42 pp. 5315-5317
ISSN:
1364-548X
Subject:
chemical reactions; composite polymers; crystal structure; solar cells; solar energy; solubility
Abstract:
... A low band-gap alternating copolymer of indolocarbazole and benzothiadiazole-cored oligothiophene demonstrated balanced crystallinity and solubility; a solar cell combining this polymer with PC₆₁BM in a preliminary test demonstrated power conversion efficiencies of 3.6%. ...
DOI:
10.1039/b811031j

13. Dendrimer design using Cuᴵ-catalyzed alkyne–azide “click-chemistry”

Author:
Franc, Grégory; Kakkar, Ashok
Source:
Chemical communications 2008 no.42 pp. 5267-5276
ISSN:
1364-548X
Subject:
alkynes; azides; catalytic activity; chemoselectivity; cycloaddition reactions; dendrimers; triazoles
Abstract:
... The chemoselective [3+2] cycloaddition of an azide on to an alkyne, catalyzed by Cu¹, has become known as “click-chemistry”. The ease with which this reaction can be carried out and the formation of pure product without the need for further purification, offer a tremendous potential in developing monodisperse 1,4-disubstituted 1,2,3-triazole heterocycle based macromolecules of a diverse nature. Th ...
DOI:
10.1039/b809870k

14. Deprotonative cadmation of functionalized aromatics

Author:
L’Helgoual’ch, Jean-Martial; Bentabed-Ababsa, Ghenia; Chevallier, Floris; Yonehara, Mitsuhiro; Uchiyama, Masanobu; Derdour, Aïcha; Mongin, Florence
Source:
Chemical communications 2008 no.42 pp. 5375-5377
ISSN:
1364-548X
Subject:
ambient temperature; aromatic compounds; chemical reactions; chemoselectivity; regioselectivity
Abstract:
... This communication describes the deproto-metalation of a large range of aromatics including heterocycles using a newly developed lithium–cadmium base; the reaction proceeds at room temperature with an excellent chemoselectivity and efficiency, and proved to be regioselective in most cases. ...
DOI:
10.1039/b809543d

15. Diborylenetetraaminoperylenes (DIBOTAP): a new class of highly fluorescent functional polycyclic aromatic hydrocarbons with N–B–N units

Author:
Riehm, Till; De Paoli, Gabriele; Wadepohl, Hubert; De Cola, Luisa; Gade, Lutz H.
Source:
Chemical communications 2008 no.42 pp. 5348-5350
ISSN:
1364-548X
Subject:
electrochemistry; fluorescence; oxidation; polycyclic aromatic hydrocarbons
Abstract:
... A new class of N–B–N functionalized perylenes derived from N,N′,N″,N‴-diborylene-3,4,9,10-tetraaminoperylene (DIBOTAP) is readily accessible via several synthetic routes; they display intense green fluorescence and undergo two electrochemically reversible one-electron oxidation steps at ∼−0.2 V and 0.3 V (vs. SCE). ...
DOI:
10.1039/b811864g

16. DNA-embedded Au/Ag core–shell nanoparticles

Author:
Lim, Dong-Kwon; Kim, In-Jung; Nam, Jwa-Min
Source:
Chemical communications 2008 no.42 pp. 5312-5314
ISSN:
1364-548X
Subject:
alloy nanoparticles; chemical reactions; gold; nanogold; nanosilver; optical properties; silver; silver staining
Abstract:
... Here, we synthesized highly stable DNA-embedded Au/Ag core–shell nanoparticles (NPs) by a straightforward silver-staining of DNA-modified Au nanoparticles (AuNPs); unlike conventional DNA-surface modified NPs that present particle stability issues, DNA-embedded core–shell NPs offer an extraordinary stability with nanoscale controllability of silver shell thickness; these DNA-embedded core–shell NP ...
DOI:
10.1039/b810195g

17. Electron-rich heteroaromatic conjugated bipyridine based ruthenium sensitizer for efficient dye-sensitized solar cells

Author:
Abbotto, Alessandro; Barolo, Claudia; Bellotto, Luca; Angelis, Filippo De; Grätzel, Michael; Manfredi, Norberto; Marinzi, Chiara; Fantacci, Simona; Yum, Jun-Ho; Nazeeruddin, Mohammad K.
Source:
Chemical communications 2008 no.42 pp. 5318-5320
ISSN:
1364-548X
Subject:
chemical reactions; dicarboxylic acids; heterocyclic compounds; ruthenium; solar cells; solar radiation
Abstract:
... A novel heteroleptic ruthenium complex carrying a heteroaromatic-4,4′-π-conjugated 2,2′-bipyridine [Ru(ii)LL′(NCS)₂] (L = 4,4′-bis[(E)-2-(3,4-ethylenedioxythien-2-yl)vinyl]-2,2′-bipyridine, L′ = 4,4′-(dicarboxylic acid)-2,2′-bipyridine) was synthesized and used in dye-sensitized solar cells, yielding photovoltaic efficiencies of 9.1% under standard global AM 1.5 sunlight. ...
DOI:
10.1039/b811378e

18. Enantioselective synthesis of cyclopropylcarboxamides using s-BuLi–sparteine-mediated metallation

Author:
Lauru, Stephanie; SimpkinsCurrent address: School of Chemistry, University of Birmingham, Edgbaston, Birmingham, UK, B15 2TT, Nigel S.; Gethin, David; Wilson, Claire
Source:
Chemical communications 2008 no.42 pp. 5390-5392
ISSN:
1364-548X
Subject:
chemical compounds; chemical reactions; enantioselective synthesis
Abstract:
... Enantioselective synthesis of cyclopropylcarboxamides is possible by asymmetric metallation of prochiral starting cyclopropanes using s-BuLi–sparteine. ...
DOI:
10.1039/b810441g

19. Encapsulated molecular catalysts in polysiloxane gels: ruthenium cluster-catalyzed isomerization of alkenes

Author:
Motoyama, Yukihiro; Abe, Motonori; Kamo, Kazuyuki; Kosako, Yusuke; Nagashima, Hideo
Source:
Chemical communications 2008 no.42 pp. 5321-5323
ISSN:
1364-548X
Subject:
alkenes; catalysts; catalytic activity; encapsulation; gels; glycols; isomerization; ruthenium; siloxanes
Abstract:
... Novel ruthenium-encapsulating polysiloxane gels are prepared by treatment of polymethylhydrosiloxane with diols in the presence of (μ₃,η²,η³,η⁵-acenaphthylene)Ru₃(CO)₇, and act as reusable catalysts in the isomerization of alkenes without leakage of the catalyst species. ...
DOI:
10.1039/b809937e

20. Glucose production from saccharides using layered transition metal oxide and exfoliated nanosheets as a water-tolerant solid acid catalyst

Author:
Takagaki, Atsushi; Tagusagawa, Caio; Domen, Kazunari
Source:
Chemical communications 2008 no.42 pp. 5363-5365
ISSN:
1364-548X
Subject:
catalysts; catalytic activity; cellobiose; cellulose; chemical compounds; glucose; hydrolysis; nanosheets; starch; sucrose
Abstract:
... The layered transition-metal oxide HNbMoO₆ is demonstrated to exhibit remarkable catalytic performance for the hydrolysis of saccharides such as sucrose, cellobiose, starch, and cellulose, attributable to water tolerance and the facile accessibility of saccharides into the strong acidic interlayer gallery of the solid. ...
DOI:
10.1039/b810346a