Chemistry Letters, Highlight Reviews

2010, Vol. 39 No. 1-12


October 2010, Vol.39 No.10

Web Release Date: August 21, 2010
1022	Optical Resolution of Single-Walled Carbon Nanotubes through Molecular Recognition with Chiral Diporphyrin Nanotweezers
	Xiaobin Peng, Feng Wang, Ajoy Kumar Bauri, A. F. M. Mustafizur Rahman, and Naoki Komatsu
	[Full Text PDF(J-STAGE)] Open Access Article

	Single-walled carbon nanotubes (SWNTs) have either chiral or achiral form, and synthesized chiral SWNTs include both left- and right-handed structures in equal amounts. Recently, a racemic mixture was found to be resolved through molecular recognition with gable-type chiral diporphyrins, namely, nanotweezers. This novel separation method for SWNTs allowed optical resolution of SWNTs for the first time. The chiral nanotweezers consist of two chiral porphyrins and a rigid spacer in between. Therefore, they have potential to discriminate not only the handedness but also the diameters or alignments of the hexagons of SWNTs. We have prepared the following three types of chiral nanotweezers; m-phenylene-, 2,6-pyridylene-, and 3,6-carbazolylene-bridged diporphyrins. In the extraction of SWNTs, different selectivities have been observed among the nanotweezers. This can be attributed to the differences in their structures; namely, the dihedral angles and the distance of the two porphyrins. In this review, we would like to discuss the relationship between the structures of the nanotweezers and the results of the optical and (n,m) enrichment of the extracted SWNTs.


September 2010, Vol.39 No.9

Web Release Date: July 17, 2010
908	Bifunctional Organometallic Catalysis and Reactivity Using Heterocyclic Phosphines and Metallated Heterocycles
	Douglas B. Grotjahn
	[Full Text PDF(J-STAGE)]

	Pyridyl- and imidazolylphosphines accelerate anti-Markovnikov alkyne hydration and alkene isomerization and deuteration by factors of 1000 to more than 10000. Evidence for proton transfer and hydrogen bonding in catalytic intermediates comes from computational, mechanistic, and structural studies. Related concepts are being applied to a novel class of protic N-heterocyclic carbene complexes which feature an unusual NH group.


August 2010, Vol.39 No.8
Web Release Date: June 26, 2010
796	Chemistry in Calixarenes and Radicals: Inclusion, Spin Label, Reaction, and ESR Studies
	Yong Li and Haijun Yang
	[Full Text PDF(J-STAGE)]

	Radicals used as spin probes can provide important information on structures and conformational changes of calixarenes through inclusion complexes of radicals or spin labels. Multispin-labeled calixarenes and polyradicals based calixarene skeletons should provide chances to study magnetic interaction and develop potential applications. In the present review, recent progresses in chemistry of calixarene and free radicals are described.


July 2010, Vol.39 No.7
Web Release Date: May 22, 2010
658	Triptycene Derivatives: Synthesis and Applications
	Liwei Zhao, Zhong Li, and Thomas Wirth
	[Full Text PDF(J-STAGE)]


June 2010, Vol.39 No.6


Web Release Date: April 24, 2010
532	Random Dispersion of Metal Nanoparticles Can Form a Laser Cavity
	Shunsuke Murai, Koji Fujita, Xiangeng Meng, and Katsuhisa Tanaka
	[Full Text PDF(J-STAGE)]

	Metal nanoparticles are efficient scatterers for light at around the frequency of localized surface plasmon resonance. By randomly dispersing such strong scatterers into a gain material, a laser system is prepared where multiple scattering plays a role of optical cavity. This type of laser is called random laser and has been developed using dielectric scatterers. This article highlights the application of metal nanoparticles to the random laser and examines the advantages of the metallic scatterers compared to the dielectric scatterers.


May 2010, Vol.39 No.5


Web Release Date: March 31, 2010
430	Luminescent Organoboron Conjugated Polymers
	Atsushi Nagai and Yoshiki Chujo
	[Full Text PDF(J-STAGE)]

	The incorporation of luminescent organoboron dyes into π-conjugated polymer backbones is attractive for potential applications as electroluminescent devices, organic field-effect transistors, and photovoltaics. We have developed various boron π-conjugated polymers by introduction of stable tetracoordinated organoboron dyes into π-conjugated polymer backbones to afford more stable and higher luminescent conjugated polymers than three-coordinated organoboron polymers. Recent advances in the field of organoboron polymers are reviewed here.


Apr. 2010, Vol.39 No.4


Web Release Date: March 13, 2010
312	Heteronuclear Double Bonds E=E′ (E = Heavy Group 14 Element, E′ = Group 13–16 Element)
	Vladimir Ya. Lee, Akira Sekiguchi, Jean Escudié, and Henri Ranaivonjatovo
	[Full Text PDF(J-STAGE)]

	Recent developments in the field of the heteronuclear double bonds >E=E′ (E = heavy group 14 element, E′ = group 13–16 element) are covered in the present review with a particular focus on the kinetic stabilization with the bulky substituents.


Mar. 2010, Vol.39 No.3


Web Release Date: January 30, 2010
148	Carotenoid Radicals: Cryptochemistry of Natural Colorants
	Lowell D. Kispert and Nikolay E. Polyakov
	[Full Text PDF(J-STAGE)]

	This review examines the properties and uses of carotenoid radicals. Their mechanisms of action on the molecular level play a crucial role in electron transfer and light regulation processes in photosynthesis, in the design of improved artificial solar cells, and in the scavenging of toxic free radicals. There is a remarkable increase in the quantum yield and the lifetime of the charge-separated states of the carotenoid radical cations in the supramolecular “hosts” β-glycyrrhizic acid (GA) and arabinogalactan (AG).


Feb. 2010, Vol.39 No.2


Web Release Date: January 16, 2010
78	The Diversified Reactivities of 1,5-Bisallenes
	Guofei Chen, Xuefeng Jiang, Chunling Fu, and Shengming Ma
	[Full Text PDF(J-STAGE)]

	1,5-Bisallenes may undergo radical, carbometallation, cyclometallation, cyclization, and consecutive cascade reactions to form many different 5–7-membered rings, showing diversified reactivities. There is no doubt that the chemistry of 1,5-bisallenes would be enriched by further study.


Jan. 2010, Vol.39 No.1
Web Release Date: December 12, 2009
10	Metallo-supramolecular Systems for Synergistic Functions Based on Unique Arrangement of Ligation Sites
	Tatsuya Nabeshima, Shigehisa Akine, Chusaku Ikeda, and Masaki Yamamura
	[Full Text PDF(J-STAGE)]


Web Release Date: December 5, 2009
2	9,9-Diarylfluorene Moiety Incorporated into Polymer Main Chains: An Essential Skeleton Exhibiting Prominent Physical, Chemical, and Optical Properties
	Yasuhito Koyama, Kazuko Nakazono, Hideki Hayashi, and Toshikazu Tataka
	[Full Text PDF(J-STAGE)]

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List of
Highlight Review
[2010]
[2009] [2008] [2007]
[2006] [2005] [2004]

Vol. 39 (2010)
No. 1 – No. 12

Vol. 38 (2009)
No. 1 – No. 12

Vol. 37 (2008)
No. 1 – No. 12

Vol. 36 (2007)
No. 1 – No. 12

Vol. 35 (2006)
No. 1 – No. 12

Vol. 34 (2005)
No. 1 – No. 12

Vol. 33 (2004)
No. 4 – No. 12