著者

Isao Shitanda Tasuku Yamaguchi Yoshinao Hoshi Masayuki Itagaki

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

pp.130681, (Released:2013-08-24)

被引用文献数

17

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A fully screen-printed electrode chip was fabricated for glucose detection. The utility of the screen-printed electrode chip based on a Japanese paper was demonstrated through the determination of glucose using the reaction of glucose oxidase with tetrathiafulvalene. The calibration curve showed good linearity in the concentration range 10 to 100 mM, with a slope of 0.055 μA mM−1. The paper-based electrode chip is potentially applicable for point-of-care monitoring because it is easy to use, inexpensive, and readily disposable.

著者

Takako Hikima Yoshimune Nonomura

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.37, no.3, pp.338-339, 2008-03-05 (Released:2008-02-16)

参考文献数

9

被引用文献数

10

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We successfully powderized keratin fibers under mild conditions. Wool keratin was hydrolyzed in a binary system, consisting of a higher alcohol phase and an alkali aqueous solution phase.

著者

Takanori Suzuki Takuma Kuroda Hitomi Tamaoki Sho Higasa Ryo Katoono Kenshu Fujiwara Takanori Fukushima Hidetoshi Yamada

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.7, pp.706-708, 2013-07-05 (Released:2013-07-05)

参考文献数

29

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Upon oxidation of the title heterocycles with dimethylamino groups, elemental sulfur is extruded to form dicationic dyes, which regenerate the heterocycles by the reaction with Na2S. The electrolysis of the heterocycles induces a drastic change in UV–vis spectrum exhibiting several isosbestic points. The bay-region substituents enhance configurational stability, so the optically pure heterocycle can be obtained in terms of helicity of one-handedness, and its chromism is accompanied by a large chiroptical response as detected by CD spectroscopy.

著者

Takanori Suzuki Hitomi Tamaoki Ryo Katoono Kenshu Fujiwara Junji Ichikawa Takanori Fukushima

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.7, pp.703-705, 2013-07-05 (Released:2013-07-05)

参考文献数

24

---

Octafluorobiphenyl-2,2′-diylbis(diarylmethylium) dye 2a2+ prepared from 1,2-dibromotetrafluorobenzene is interconvertible with colorless dihydrophenanthrene donor 1a. By the SNAr reactions of 1a with acetylides, π-extended analogues 1b and 1c were obtained. Their electrochromic behavior is accompanied by a drastic absorption change not only in the visible but also UV region, because the torsion angle of the biaryl unit is modified upon redox reactions.

著者

Yuki Hamasaki Naotoshi Nakashima Yasuro Niidome

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.9, pp.1093-1095, 2013-09-05 (Released:2013-09-05)

参考文献数

19

被引用文献数

4

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Electrochemical oxidation of silver shells on gold nanorods was examined using in situ spectroscopy and scanning electron microscopy. The oxidation, in a phosphate buffer solution, was suppressed because of the formation of Ag3PO4. In contrast, oxidation in a KCl solution occurred at the corners of the nanorods and proceeded until giving gold nanorods without silver shells. After the 10-s electrolysis, nanoparticles with different shapes were found on the electrode. The inhomogeneous oxidation was due to rapid oxidation of the silver shells and occasional contact of the nanorods with the electrode surfaces.

著者

Kohei Shimoda Tsuyohiko Fujigaya Naotoshi Nakashima Yasuro Niidome

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

pp.130457, (Released:2013-06-21)

被引用文献数

3

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Poly(N-isopropylacrylamide) (PNIPAM) was coated on gold nanorods (NRs) without forming aggregates. The PNIPAM-coated NRs (PNIPAM-NRs) formed aggregates at higher temperature than the lower critical solution temperature (LCST) of the PNIPAM layers. The aggregation showed reversible spectroscopic responses under repeated temperature cycles. When near infrared (near-IR) light irradiated a PNIPAM-NR solution, the temperature raise up, and formed aggregates that showed broad and weak surface plasmon bands. The spectroscopic responses in near-IR region work as a negative feedback for heating a photoirradiated nanorod solution. The feedback offers spontaneous temperature control of the photoirradiated solution at LCST of PNIPAM.

著者

Dong-Heon Lee Narasimha N. Murthy Kenneth D. Karlin

出版者

(社)日本化学会

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

vol.80, no.4, pp.732-742, 2007-04-15 (Released:2007-04-13)

参考文献数

80

被引用文献数

6

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Copper(I)–dioxygen reactivity studies utilizing new binucleating ligands are described. When catalytic quantities of either CuI or CuII salts were introduced to LH2, which is a dinucleating ligand with two tridentate donors connected via a methylene group at a bis(2-pyridyl)methane junction, dioxygen addition caused complete oxygenation to give bis(2-pyridyl)ketone product L=O. Isolated dicopper(I) complex [CuI2(LH2)]2+ (1) also reacted with excess O2 to give L=O. Additional observations were consistent with a mechanism that does not involve “oxygen-activation” in this process. Ketone hydration and gem-diol(ate) copper(II)-coordination occurred by addition of copper(II)–perchlorate to L=O, giving [CuII2{L(OH)(O−)}Cu2II(−OClO3)]2+ (4), with a bridging alkoxide moiety (X-ray). Oxygenation of [CuI2(L=O)(CH3CN)2]2+ (2) (2/O2 = 0.5, i.e., Cu/O2 = 4:1 manometry), gave [CuII2{L(O−)2}(−OClO3)]+ (5), where both oxygen atoms of the doubly deprotonated gem-diolate bind separate copper(II) ions; mass spectrometric data showed that one of the two oxygen atoms of the gem-diolate L(O−)2 came from O2. An oxo–dicopper(II) species is suggested as an important intermediate, which is supported by the observation that reaction of 2 with NO or iodosylbenzene also produced 5 in high yields. Complexes 4 and 5 are acid–base conjugate pairs and can be readily interconverted using Et3N or HClO4(aq) reagents.

著者

Yan Li Chang-Hui Ye Li-De Zhang Xiao-Sheng Fang Yu-Gang Zhang

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.33, no.12, pp.1638-1639, 2004 (Released:2004-11-20)

参考文献数

16

被引用文献数

7

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The novel silica nanotubes with flower-like morphology and hexagonal outer surface morphology were fabricated via a simple ZnS nanowires templates-assisted CVD method. The as-synthesized nanotubes exhibited strong visible photoluminescence at 615 nm and indicated that the method was useful to produce silica nanotubes.

著者

Kentaro Okuma Koki Hirano Chisato Shioga Noriyoshi Nagahora Kosei Shioji

出版者

(社)日本化学会

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

vol.86, no.5, pp.615-619, 2013-05-15 (Released:2013-05-15)

参考文献数

30

被引用文献数

19

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By combination of 1,3-dipolar cycloaddition and N–O single bond insertion, tandem synthesis of dibenzo[1,4]oxazepino[4,5-a]quinolines was accomplished. Reaction of quinoline N-oxides with arynes afforded 2-(2-hydroxyphenyl)quinolines and 7-membered pentacyclic oxazepino[4,5-a]quinolines.

著者

Karin Nakamura Shunsuke Tamba Atsushi Sugie Atsunori Mori

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

pp.130523, (Released:2013-06-29)

被引用文献数

9

---

Thiophene based block copolymers are synthesized by addition of bromothiophene and Knochel-Hauser base (TMPMgCl·LiCl). Nickel-catalyzed deprotonative C–H coupling polycondensation of 3-substituted-thiophenes proceeds to give head-to-tail-type poly(3-substituted thiophen-2,5-diyl) bearing nickel at the polymer end. Block copolymers of thiophene derivatives are obtained by successive addition of 2-bromo-3-alkylthiophene and magnesium amide to a living polythiophene end. The use of nickel catalyst bearing an o-tolyl group gives the tolyl-group-terminated thiophene diblock copolymers in highly efficiently. Triblock copolymer is also synthesized by the iterative addition of bromothiophene and TMPMgCl·LiCl.

著者

Karin Nakamura Shunsuke Tamba Atsushi Sugie Atsunori Mori

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.10, pp.1200-1202, 2013-10-05 (Released:2013-10-05)

参考文献数

38

被引用文献数

9

---

Thiophene-based block copolymers are synthesized by addition of bromothiophene and the Knochel–Hauser base (TMPMgCl·LiCl). Nickel-catalyzed deprotonative C–H coupling polycondensation of 3-substituted-thiophenes proceeds to give head-to-tail-type poly(3-substituted thiophen-2,5-diyl) bearing nickel at the polymer end. Block copolymers of thiophene derivatives are obtained by successive addition of 2-bromo-3-alkylthiophene and magnesium amide to a living polythiophene end. The use of nickel catalyst bearing an o-tolyl group gives the tolyl-group-terminated thiophene diblock copolymers in high efficiency. Triblock copolymer is also synthesized by the iterative addition of bromothiophene and TMPMgCl·LiCl.

著者

Taro Oyama Hiroyuki Mayama Yoshimune Nonomura

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

pp.130307, (Released:2013-05-30)

被引用文献数

8

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We have investigated the spreading process of oil-in-water emulsions containing oleic acid droplets on flat and rough fractal agar gel surfaces. Significant spreading inhibition owing to local condensation of oil droplets is observed on flat agar gel surfaces. On the other hand, such inhibition is not observed on the fractal gel surfaces for any of the emulsions. The rough structure of the gel surfaces is an important factor of spreading dynamics of emulsions on surfaces.

著者

Toshiaki Taira Yuji Suzaki Kohtaro Osakada

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.9, pp.1062-1064, 2013-09-05 (Released:2013-09-05)

参考文献数

33

被引用文献数

12

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Addition of α-cyclodextrin (α-CD) to amphiphilic Pd(II) complex with bipyridinium ligands forms the metal-containing rotaxane, and its aqueous solution undergoes sol–gel transition depending on the temperature and concentration.

著者

Suguru Yoshida Takamitsu Hosoya

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.6, pp.583-585, 2013-06-05 (Released:2013-06-05)

参考文献数

34

被引用文献数

57

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Arynes, generated in situ from o-(trimethylsilyl)aryl triflates by treatment with a fluoride, have been shown to react efficiently with various alkoxyphosphines via a mechanism similar to the Michaelis–Arbuzov reaction. Diverse aromatic oxophosphorus compounds, including derivatives with an ortho-ester function, have become easily available from a common aryne precursor by this method.

著者

Hiroyuki Shimogawa Haruki Mori Atsushi Wakamiya Yasujiro Murata

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

pp.130360, (Released:2013-06-01)

被引用文献数

19

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Dibenzo[b,g]-fused and dithieno[b,g]-fused BODIPY derivatives were synthesized, and the electronic impacts of the introducing dibenzo- and dithieno-fused structures at both of the b and g bonds in the BODIPY skeleton were investigated. Electrochemical and photophysical measurements demonstrated that these structural modifications effectively enhance the electron accepting ability of the BODIPY skeleton leading to the red-shifted absorption.

著者

Takanori Shibata Kyoko Takami Yoshikazu Arai Kyoji Tsuchikama Shunsuke Maekawa

出版者

(社)日本化学会

雑誌

Bulletin of the Chemical Society of Japan (ISSN:00092673)

巻号頁・発行日

vol.77, no.10, pp.1937-1938, 2004 (Released:2004-10-09)

被引用文献数

1

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Lithium butatrienolates were prepared in situ by the 1,4-elimination from 2-butynyl trimethylsilyl ethers along with a retro-Brook rearrangement. The addition reaction of the enolates with the aldehydes afforded β-hydroxy-α-vinylidene acylsilanes.

著者

Hideyuki Tukada Toshihiro Hiraki Hiroshi Nakamura

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.6, pp.630-632, 2013-06-05 (Released:2013-06-05)

参考文献数

28

被引用文献数

3

---

[2]Rotaxanes constructed with an ethereal end-capped axle and a dibenzo-24-crown-8 wheel were synthesized from pseudorotaxanes bearing an alcoholic terminus and diaryldiazomethanes using diphenyl phosphate as a catalyst. The reaction proceeded at room temperature in nonpolar solvents within several hours. The [2]rotaxanes thus obtained behaved as ammonium salts derived from a very strong base such as DBU. Thus, the amine form of the [2]rotaxane reacted with a weak acid, CO2–H2O, to give a hydrogencarbonate salt of the [2]rotaxane, which turned back to the amine form after drying followed by evacuation.

著者

Akihito Konishi Yasukazu Hirao Kouzou Matsumoto Hiroyuki Kurata Takashi Kubo

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.6, pp.592-594, 2013-06-05 (Released:2013-06-05)

参考文献数

50

被引用文献数

52

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The improved Scholl reaction allows for the direct cyclization of anthracene oligomers to give bisanthene, teranthene, and quateranthene. Furthermore, a variety of π-expanded bisanthenes are obtained by the Diels–Alder cycloaddition of bisanthene with several arynes. These reactions would allow us to synthesize various size- and shape-controlled polyperiacenes.

著者

Shunsuke Tamba Kanta Fuji Hikaru Meguro Shuji Okamoto Tadashi Tendo Ryo Komobuchi Atsushi Sugie Takashi Nishino Atsunori Mori

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

vol.42, no.3, pp.281-283, 2013-03-05 (Released:2013-02-23)

参考文献数

62

被引用文献数

36

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High-molecular-weight head-to-tail-type regioregular polythiophenes are synthesized by [CpNiCl(SIPr)]-catalyzed dehydrobrominative polycondensation. Polycondensation of 2-bromo-3-hexylthiophene at the C–H bond proceeds with an equimolar amount of TMPMgCl·LiCl and a catalytic amount of [CpNiCl(SIPr)] to afford the regioregular poly(3-hexylthiophene) (HT-P3HT) with up to Mw = 815000. A self-standing HT-P3HT film is obtained with the regioregular HT-P3HT of Mw = 414000, while the attempted formation of the corresponding film with lower-molecular-weight HT-P3HT (Mw = 38000) is unsuccessful.

著者

Masa-aki Kishida Satoshi Muratsugu Ryota Sakamoto Tetsuro Kusamoto Hiroshi Nishihara

出版者

(社)日本化学会

雑誌

Chemistry Letters (ISSN:03667022)

巻号頁・発行日

pp.121264, (Released:2013-03-19)

被引用文献数

7

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We prepared dimethyldihydropyrene (DHP) derivative 2 which possesses two ferrocenyl groups at the 4 and 9 positions through ethynylene linkers. 2 showed intense electronic communication between the two ferrocenyl groups, which is promoted by the highly developed π-orbital of the diethynylDHP moiety.