chemistry letters€¦ · 594 dehydration of concentrated acetic acid solutions by pervaporation...

Chemistry Lettershttp://www.csj.jp/journals/chem-lett/

Vol.36 No.5 CMLTAGMay, 2007 ISSN 0366-7022

Copyright � 2007 The Chemical Society of Japan

578 Development of New SemiconductingMaterials for Durable High-performanceAir-stable Organic Field-effect Transistors

Au (drain)Au (source)

n -Si (gate electrode)SiO2

Kazuo Takimiya, Yoshihito Kunugi, and TetsuoOtsubo

New thiophene- and selenophene-fused aromatic compounds were successfully developed as high-performance semicon-ducting materials for organic field-effect transistors (OFETs). Among them, the most advanced compounds designed onconsideration of structure–function relationship showed durable air-stable FET performance. This article highlights theresearch strategy and development of these superior compounds as well as the molecular factors for the improvement ofmobility, sensitivity, and stability, which are very informative for the design of practical semiconductors.

Highlight Review

Letter

584 Aromatic Fluorination Effect on the Meso-morphic Properties of Discotic LiquidCrystal of Alkoxybenzoyloxytriphenylene

OO O

O

OO

O

O

OR

OR

OR

OR

RO

ROO

O O

O

OO O

O

OO

O

O

OR

OR

OR

OR

RO

ROO

O O

FF

FFOF

F

FF

F

F

F

FF

F

FF

FF

F

FF

F FF

ND PhaseColh Phase

Fluorination of Aromatic rings

R=C6H13, C10H21

Yasuyuki Sasada, Hirosato Monobe, YasukiyoUeda, and Yo Shimizu

C-72 Chemistry Letters Vol.36, No.5 (2007)

Copyright � 2007 The Chemical Society of Japan http://www.csj.jp/journals/chem-lett/

586 Oxidative Degradation of Organic Pollutantsby Hydrogen Peroxide in the Presence ofFePz(dtnCl2)4 under Visible Irradiation

N

N

NN

N

N

N

N

S

S

SS

SS

S

S

ClCl

Cl

Cl

ClCl

Cl

ClFe

H2O2N

N

N

NNN

NN

SS

S

S

S

S

S S

Cl

Cl

ClCl

Cl

Cl

Cl Cl

Fe

O=OH

organic pollutants+ hv ( > 420nm)

CO2 + H2O 62. 5%mineralization

water-soluble productsaromic ring cleavage

80 min

Jie Sun, Yuping Sun, Kejian Deng, Haobo Hou,and Duoyuan Wang

588 Unexpected Reaction of an Overcrowded9,10-Dihydroanthrylchlorosilane Leading tothe Formation of a Dibenzo-7-silanorborna-diene Derivative

SiMe3H SiMe3

Me3Si

Me3Si

SiMe3

SiMe3

Tbt group

Si

H

Cl

TbtLDA

THF−40 °C

SiHTbt

Tbt

SiH

Takahiro Sasamori, Shuhei Ozaki, and NorihiroTokitoh

Electronic Supporting Information

590 Hexaphenylbenzene Derivatives for BlueOrganic Light-emitting Devices

Wide-energy-gap materials for blue organic light-emitting devices.

Soichi Watanabe and Junji Kido

592 Efficient Synthesis of Fused 1,2,3-Triazolo-�-lactams Using Huisgen [3 + 2] DipolarCycloaddition ‘‘Click-chemistry’’ in Water

Quick synthesis of 1,2,3-triazolo-δ-lactams from azides derived from amino acids using “click-chemistry” in water followed by cyclization.

NN

NN

X

O CO2Me

NPgX

N3

cycloaddition& cyclization

X= OH, N3, CH2, Ph, CH3, CH(CH3)2

Indresh Kumar and Chandrashekhar V. Rode


594 Dehydration of Concentrated Acetic AcidSolutions by Pervaporation Using NovelMER Zeolite Membranes

4 µmThe surface of MER membrane

4 µm

After immersing in 90 wt % AcOHsolution at 40 °C for 4.5 days.

20 40 60 80 100

at 40 °C

wt % of water in the AcOH feed solution

0

20

40

60

80

100

0

wt %

of

wat

er in

the

perm

eate

pH = 1.9

PV performanceof low-silicaMER membrane

pH = 1.8

H2O–AcOHV–L–E curve

pH = 2.3

The MER zeolite membranes are

acetic acid solution.

relatively acid tolerant in low-silica8MR zeolite group, and the low-SAR-type MER membrane exhibited highwater selectivity even for a 90 wt %

Takako Nagase, Yoshimichi Kiyozumi,Yasuhisa Hasegawa, Tomoya Inoue, TakujiIkeda, and Fujio Mizukami

Chemistry Letters Vol.36, No.5 (2007) C-73


596 A Good Linear Relationship between theLogarithms of Formation Constants andthe Stabilization Energies of �- and �-Cyclo-dextrin Complexes of Several Phenol andBenzoic Derivatives

0 20 40 60 801

2

3

4

5

6

∆E / kJ·mol-1

log

Kf

R= 0.990

∆Es∆E

t

Hai Ming Wang and Le Xin Song

598 Fabrication and Photoluminescence of Ur-chin-like ZnO/MgO Hierarchical Structures

We report a one-step preparation of novel hollow urchin-like ZnO/MgO hierarchical structures,that is ZnO nanorods grown on hollow MgO microspheres.

a b

cLi-rong Qin, Jian-wei Zhao, Li-de Zhang, andXian-wu Zou

600 Spontaneous Assembly of Dendrite Structureby Coordination of Al to 5,8-Dihydroxy-1,4-naphthoquinone

Yoshihiro Koide and Yusuke Sato

602 Highly Emissive Pyrene-excimer Formationin Self-assembled Monolayer on Gold Sur-face and Photocurrent Generation from theExcimer

Strong pyrene excimer fluorescence is observed in the SAM derived from disulfide-functionalized bis-pyrene derivative on gold surface at the pyrene surface coverage similar tothat exhibits only weak monomer fluorescence in the SAM derived from disulfide-functinalizedmonopyrene derivative. The pyrene excimer is less sensitive to the quenching by gold substratethan pyrene monomer excited state. The photocurrent generates from the excimer emissiveSAM more effectively than the monomer emissive SAM.

Mitsunobu Nakamura, Norikazu Saito, KaoriTakayama, Satoshi Kumamoto, and KazushigeYamana


604 Unexpected Ring-opening Reaction of Aziri-dine with Acetic Anhydride in DMF Ring-opening reactions of aziridines with acetic anhydride in DMF afforded the unexpected β-

amino formate in moderate to good yields. The possible mechanism is also proposed.

R2

R1

NTsDMF

O

O OR2 R1

NHTsOH

OR1 R2

NHTsOH

O+

β

Tianning Diao, Xiaoyu Sun, Renhua Fan, andJie Wu



606 Cross-coupling Reaction of Allylic and Ben-zylic Carbonates with Organo[2-(hydroxy-methyl)phenyl]dimethylsilanes

OSiMe2

SiMe2

HO

R1

Pd (Cu) cat.50−80 °C(− CO2, HOR2) R1 = alkenyl, aryl

or

1) LiAlH4, AcCl2) Alkyne, Pt cat.

R1−MgX(X = Cl, Br)

O

O

R2O

R1

base-free !

Yoshiaki Nakao, Shiro Ebata, Jinshui Chen,Hidekazu Imanaka, and Tamejiro Hiyama


608 Aerogel-like Three-dimensional Gold Nano-particle Network via Sublimation of VolatileOrganic Crystals Decorated with Gold Nano-particles

Yuzo Fujiki, Seiji Shinkai, and Kazuki Sada

610 Controlled Organization of Silver Nanopar-ticles into Network Assemblies by TuningpH Values

S

S

C

O O-

O

O-

C

SC O

O-

O

O-C

C

OO-

O

O-C

pH=5

pH=4

OH

OH

OH

OH

OH

OH

OH

OH

OH

OH

OH

OH

SCO

O-

O

O-C

2D network

3D network

H-bonding

H-bonding

In this article, we investigated the assembly of 2-mercaptosuccinic acid-functionized silver NPs

controlling the pH values of the solution, variousdimensional networks of silver NPs can be obtained.

2-mercaptosuccinic acid (MSA) molecules, which

process two free −COONa (COOH) groups and

The −COONa groups can be acidified below its pKa

value and usually form intermolecular hydrogen

controlled by tuning pH values of solution. By

The nature of assembly is hydrogen bonding between

−SH group which interacted with silver NPs surface.

bonds.

Lanlan Sun, Gang Wei, Yonghai Song, LiWang, Cunlan Guo, Yujing Sun, and Zhuang Li

612 Henry Reaction and 1,4-Addition of Nitro-alkanes to �,�-Unsaturated Carbonyl Com-pounds under the Influence of MS 4 �A inDMSO

R' NO2

R'' MS 4 Å NO2

R' R''DMSOR1 R2

O

R2

OHR1

+

R3 R4

O+ MeNO2

MS 4 Å

DMSO

R3

R4

OO2NTakeshi Oriyama, Masaru Aoyagi, and

Katsuyuki Iwanami

614 Gold Electrodes Modified with Multilayersof M–TTF–Tetrathiolate (M = NiII andCuII, TTF = Tetrathiafulvalene)

TTFS4

Metal ion

Au

The Au electrode is modified with TTFS4n− anion and metal cations, in which the

square-coordinated metal ions can enhance the electron transition between the electrodeand the multilayers.

Yu Liu, Qin-Yu Zhu, Guo-Qing Bian,Wen-Juan Guo, Wen Lu, and Jie Dai




616 Application of Bond Energy Density Analysis(Bond-EDA) to Diels–Alder Reaction

The bond energies of newly formed bonds on (a) ortho and (b) meta of transition state in theDiels−Alder reaction between 1-methoxy-1,3-butadiene and acrolein.

(a) ortho TS (b) meta TS

C

H

O

-54.7 -17.4 -34.9 -48.3

(in kcal•mol-1)

∆E‡ = 14.5 ∆E‡ = 20.7

Takeshi Baba, Motoki Ishii, Yasuaki Kikuchi,and Hiromi Nakai


618 Tetrathiaselenepin Ring Fused to Benzeneand Naphthalene Benzo[1,2,3,4,5]tetrathiaselenepin is an unstable cyclic polychalcogenide. Substituents at the

neighboring positions as well as naphthalene can stabilize the ring.

SeSS

SS

SeSS

SSR1

R2

R1/ R2 = iPr/ H/ OMe

Ashraful Alam, Satoshi Ogawa, HirokiMuraoka, Masaru Kon-no, Shiduko Nakajo,and Ryu Sato


620 Nitrogen-linked Aromatic Poly(2,7-carba-zole)s: Partially Annulated Poly(m-aniline)s

Tsuyoshi Michinobu, Hiroe Kumazawa, andKiyotaka Shigehara


622 Synthesis and Reactivities of Sulfido-bridgedIr–W and Ir–Re Heterodinuclear Complexeswith Imido Ligands

IrSHSH

Me3P

Cp*

IrS

S

Me3P

Cp*

W

NAr

NAr

H2O

H2S

IrS

S

Me3P

Cp*

W

O

O

IrS

S

Me3P

Cp*

W

NAr

S

Kazuya Arashiba, Yoshiaki Tanabe, andYouichi Ishii


624 Popcorn-like Morphology of Poly(methylmethacrylate) Particles Formed in Disper-sion Polymerization of Methyl Methacrylate Nonspherical, popcorn-like morphology of one-

component particles were formed in the unseeded

dispersion polymerization of methyl methacrylate

(MMA). The essential synthesis conditions of such

particles are relatively low temperature and low

initiator concentration.

Li-min Zhou, Shan Shi, Shin-ichi Kuroda, andHitoshi Kubota



626 Mesostructured Silica with Bush-like Mor-phology and Its Transformation into Nano-meter-sized Mesoporous Silica Particles

A new bush-like morphology of mesostructured silica having stems, branches, and leaves andits reaction time dependence disintegration into nanometer-sized mesoporous silica particlesof 150–200 nm range are presented.

C16TMABr + H2O + EtOH + NH4OH + TEOS

120 min(g)

1µm60 min(f')

10µm15 min(d)

50µm

Mahendra P. Kapoor, Yuuki Kasama, MasaakiYanagi, Takuji Yokoyama, Hironobu Nanbu,and Lekh R. Juneja

628 Chiral Ionic Liquid Containing L-ProlineUnit as a Highly Efficient and RecyclableAsymmetric Organocatalyst for Aldol Reac-tion

+[Bmim]BF4

R H

O O

R

OH O

N

N

CH3

O

Br

NH

CO2H

Chiral IL

yield up to 94%ee up to 93%

(10 mol %)

Li Zhou and Lei Wang

630 Surfactant-assisted Hydrothermal Route toOrganometallic Tris(8-hydroxyquinoline)-aluminum Nanorod Bundles

Organometallic tris(8-hydroxyquinoline)aluminum nanorod bundles can be obtained via a newsurfactant-assisted hydrothermal route on a large scale. As-prepared nanorod bundles candisplay strong PL emission.

400 500 600 700 800-500000

0

500000

1000000

1500000

2000000

2500000

3000000

3500000

4000000

4500000

5000000

5500000

PL

Int

ensi

ty/ a

rb u

nit

Wavelength/ nm

b:AlQ3submicron particles

a: AlQ3 nanorod bundles

Dekun Ma, Junhao Zhang, Xiaokai Hu,Hongyang Zhou, and Yitai Qian


632 Polyacrylamide-based Functional Polymer-immobilized Perruthenate for AerobicAlcohol Oxidation

R-CH2OH

O2 ( 1 atm: balloon )

R-CHO

O2balloon

Catalyst , toluene

80 °C

New catalyst: PEG-PNIPAAm-bound ruthenium catalyst

Aerobic Alcohol Oxidation

Hiromi Hamamoto, Masahiro Kudoh, HideyoTakahashi, Hideaki Natsugari, and ShiroIkegami


634 Synthesis of Highly Functionalized Alkenyl-phosphines by Lewis Acid-mediated Silyl-phosphination of Substituted Propiolates

Ph2PSiMe2t Bu

Ph2P

R CO2Et

SiMe2t Bu

CO2EtR+CH2Cl2

Et3Al

51–85%

Minoru Hayashi, Yutaka Matsuura, KatsutoshiKurihara, Daisuke Maeda, YasunobuNishimura, Emi Morita, Miho Okasaka, andYutaka Watanabe




636 A New Access to 3-Halo-3,3-difluoropropa-noic Acid Derivatives via Fluorine–HalogenExchange Reaction of Silyl Enolates of3,3,3-Trifluoropropanoic Acid Derivatives

OTMS

NH

F3CTiCl4 or TiBr4

ON

OO

Cl

FF

ON

OOF3C

R R

HalogenExchangeReaction

(Br)

O

R

O

TMSOTf/Et3N

72−89% yieldR = H, Bn

Enolization

Taichi Shimada, Tsutomu Konno, and TakashiIshihara


638 Synthesis of Wholly Aromatic Polymers Pos-sessing Tetra-aryl-substituted Vinylene Unitsby Palladium-catalyzed Three-componentCoupling Polymerization

Ar Ar B(OH)2(HO)2B+ +

PdCl2(PhCN)2 / KHCO3

Wholly Aromatic Polymers Possessing Tetra-aryl-substituted Vinylene Units

Ar Ar

Ar Ar

n

II

Photoluminescencein the film

Ar =

2

Kojiro Nakagawa and Ikuyoshi Tomita

640 meso-Tetrakis(�,�,�,�-o-amidophenyl)por-phinatoiron(II) Bearing a Proximal HistidylGroup at the �-Pyrrolic Position via an AcylBond: Synthesis and O2 Coordination inAqueous Media

N

N N

NFe

HNNH

O

HN

NHO

O

O

NH

N

HNNH

O

O

OO

O

OO

H

4-Carboxybutanoyl group was successfully introducedinto the β-pyrrolic position of the meso-tetrakis(α,α,α,α,-o-(1-methylcyclohexanamido)phenyl)porphine by theFriedel−Crafts reaction, and the terminal carboxyl groupwas connected with glycyl-histidine, giving an ω-histidylside chain as a proximal base. Human serum albuminhybrid incorporating the ferrous complex formed a stableO2 adduct species in aqueous media (pH 7.4, 37 °C).

β α,α,α,α,

ω

Akito Nakagawa, Teruyuki Komatsu, andEishun Tsuchida


642 Ionic Liquid-mediated Preparation Strategyfor CuCl Nanocrystal

Nanocrystal CuCl can be obtained through an environmentally friendly route in the absence ofconcentrated acid or additives. And the medium ionic liquid can be reused after the reaction.

CuCl2 + Cumagnetic stirring

I L2CuCl

Ling Wang, Chao Xu, Xiaochun Zhang, andTaokai Ying

644 DFT Study on the Mechanisms of C4H2 +CN Reaction

-60

-40

-20

0

20

40

ER:k

cal/m

ol

R

TS1

P1 C4H + HCN

TS2

IM1

TS3P3 HC5N + H

IM2

TS4P4 HC4NC + H

IM3

TS5

P5 HC3N + C2H

IM4

TS6 P6 HC2NC + C2H

P2 C4H + HNC

Yizhen Tang, Hao Sun, Yaru Pan, andRongshun Wang



646 Lewis Acid Character of Zero-valent GoldNanoclusters under Aerobic Conditions: In-tramolecular Hydroalkoxylation of Alkenes

Au NC

OH

O CH3

δ-

δ+O2

Lewis acid

Ikuyo Kamiya, Hironori Tsunoyama, TatsuyaTsukuda, and Hidehiro Sakurai


648 Amino Acid Derived Epoxide Ring Openingunder Microwave Irradiation

BocHNO

BocHN NH

OH

HAlaValNHBn

ONH

OHN

Al2O3, MW, 3min27%

Nadia Vaiana, Luca Rizzi, and Sergio Romeo


650 The First Resonance Hybrid of Silyl–Car-bene and Pyridyl–Silylene Complexes: For-mation by Aryl C–H Bond Activation ofDMAP [4-(Dimethylamino)pyridine] on aSilylene Complex O

SiMe2Me2SiH

CO

W

N

NMe2

– MeH

Me2Si SiOC

HO

Me

W N

NMe2

Rockshana Begum, Takashi Komuro, andHiromi Tobita


652 Controlled Fabrication of Decahedral GoldNanostructures by a Thermal Approach

The decahedral Au nanocrystals were prepared by a simple one-step wet-chemical route; which iscarried out by the thermal process of HAuCl4 with PVP in aqueous media. By using PVPs withdifferent chain length, decahedral, icosahedral, and plate-like Au nanostructures were obtained.

Min Zhou, Shenhao Chen, Haiqing Sun, andXiuyu Liu


654 Facile Synthesis of (�)-Ascochlorin UsingPalladium-catalyzed Three ComponentCoupling Reaction

OMe

I

OMe

OMe

Ts

OMep-TsNa (2.2 equiv.)

NaHCO3 (1.5 equiv.)

DMSO

Pd2(dba)3CHCl3 (5 mol %)

( excess ) n-Bu4NI (1.1 equiv.) OHC

Cl

OH

OH

O

(−)-Ascochlorin

Makoto Aoki, Kenji Kawashima, HirohisaFujihara, and Isao Shimizu



656 Stereochemistry of Decarboxylation of Aryl-malonate Catalyzed by Mutant Enzymes

The enantiotopos differentiating selectivity of the mutant arylmalonate decarboxylase(S36N/G74C/C188S), which catalyzes asymmetric decarboxylation of arylmethylmalonates togive the correspondibng arylpropionates, was revealed to be the same as that of the wild typeenzyme, in spite of the fact that two enzymes gave the opposite enantiomer with each other.

Me

ArCO2H

13CO2H

Me

Ar

13C

C

O

O

O

O H

S -8

Me

Ar

13C

C

O

O

O

O H

wild type

mutant

Me

Ar

13C

O

OH

Cys188

Cys74

Gly188

Gly74

SH

Me

Ar

13C

O

OH

HS

CO2

CO2

Me

Ar13CO2H

H

R -13C-9

Me

ArH

13CO2H

S -13C-9

inversion

retention

Kenji Miyamoto, Tomomi Tsutsumi, YosukeTerao, and Hiromichi Ohta


658 Efficient Method for Dehydration Condensa-tion Using Pyridine-3-carboxylic Anhydride(3-PCA): Synthesis of Carboxamides fromNearly Equimolar Amounts of CarboxylicAcids and Amines

R1 OH

O+

N

O

O O

N

0 °C, 1 hR1 NR2R3

O

(1.0 equiv.)(1.1 equiv.)

DMAP (1.1 equiv.)R2R3NH

(1.1 equiv.)

88−98 %

Setsuo Funasaka and Teruaki Mukaiyama

660 Adsorption of Manganese Porphyrin onMetal Oxides and Its Enhanced CatalyticActivity on Epoxidation Reaction

Yutaka Hitomi, Hidefumi Mukai, JunyaOhyama, Masashi Shinagawa, TetsuyaShishido, and Tsunehiro Tanaka


662 Thia- and Selenasilaboriranes and 1,3,2,4-Di-oxasilaboretane from a Stable Silaborene

Si B

OS

NSi

BN

O

Norio Nakata and Akira Sekiguchi


664 An Axial Subphthalocyanine as RatiometricFluoride Ion Sensor

Yang Li, Sheng Xu, Xin Li, Kongchang Chen,and He Tian




666 Asymmetric Trifluoromethylation of Ke-tones with (Trifluoromethyl)trimethylsilaneCatalyzed by Chiral Quaternary AmmoniumPhenoxides

O

+ Me3SiCF3

HO

N

N

H

F3C 3

CF3

CF3OPh

Rtoluene−CH2Cl2 (7:3 v/v)

F3C 3(10 mol %)

99% yieldup to 87 %ee−78 °C, 1h

R

CF

OSiMe

Hitoshi Nagao, Yoshinobu Yamane, andTeruaki Mukaiyama

668 �-1,3-Glucan Schizophyllan Can Act as aOne-dimensional Host to Arrange Icosahe-dral Carboranes

Munenori Numata, Shingo Tamesue, TakeshiNagasaki, Kazuo Sakurai, and Seiji Shinkai


670 Synthesis of Mesoporous Silica Single Crys-tal SBA-16 by Fluorinated Surfactants withShort Carbon Chains

Xiangju Meng, Daling Lu, and Takashi Tatsumi

672 Self-assembled Silver Dendritic Nanostruc-ture on the Surface of AAO Template

Zhijun Wang, Feng Tao, Dongbo Chen,Lianzeng Yao, Weili Cai, and Xiaoguang Li

674 Microwave-assisted Fabrication of PS@CdSCore–Shell Nanostructures and CdS HollowSpheres

Yongqiang Wang, Guozhong Wang,Hongqiang Wang, Chunjuan Tang, Zhi Jiang,and Lide Zhang



676 Efficient Preparation of vic-Diacetates fromEpoxides and Acetic Anhydride in the Pres-ence of Iron(III)-substituted Polyoxometa-late as Catalyst

O

R

(TBA)4[PFeW11O39].3H2O

Ac2O, 100 oC

AcO

R OAc

Catalytic ring opening of 1,2-epoxides with acetic anhydride for the one-pot synthesis of

1,2-diol esters in high to excellent yields under solvent-free condition are achieved efficiently

in the presence of (TBA)4PFeW11O39.3H2O, as catalyst.

Bahram Yadollahi and Farhad Kabiri Esfahani


678 Construction of Supramolecular Complexesby Use of Planar Bis(�-diketonato)cobalt(II)Complexes as Building Blocks

Jun Yoshida, Shin-ichi Nishikiori, and ReikoKuroda


680 Selective Preparation of Zinc Oxide Nano-structures by Electrodeposition on the Tem-plates of Surface-functionalized PolymerParticles

Mitsuru Watanabe, Hiroki Aritomo, IppeiYamaguchi, Tsutomu Shinagawa, ToshiyukiTamai, Akimasa Tasaka, and Masanobu Izaki


682 A Polydiacetylene Supramolecular Systemthat Displays Reversible Thermochromism

1. Molecular Assembly2. hν3. Heating & Cooling

O

NH

O

NH

OO

O

OO

O

1

400 450 500 550 600 650 700 750 8000.0

0.1

0.2

0.3

0.4

Ab

sorb

ance

Wavelength /nm

20 oC 35 50 65 80 95

Heating

20 oC

95 oC

Cooling

Cheol Hee Lee, Jong Seung Kim, Sun YoungPark, Dong June Ahn, and Jong-Man Kim


684 Acid–Base Property of EthylammoniumNitrate Ionic Liquid Directly ObtainedUsing Ion-selective Field Effect TransistorElectrode

Is ionic liquid of onium salt “ionic” ?

Ryo Kanzaki, Kuniaki Uchida, Shota Hara,Yasuhiro Umebayashi, Shin-ichi Ishiguro, andSatoshi Nomura



686 Micropatterned Film of Silica-coated GoldNanoparticles Formed by Covalent Bonds

Monodisperse gold nanoparticles coated with silica shells (Au@SiO2) were prepared byvortex mixing instead of magnetic stirring. With well-established surface-chemicalproperty, the Au@SiO2 nanoparticles were functionalized with the silane reagent 3-gylcidoxypropyltrimethoxysilane (GPTS). Then, these epoxy-terminated Au@SiO2

nanoparticles could be easily assembled onto the silicon surface, which had been patternedwith 3-aminopropyltriethoxysilane (APS) SAMs and octadecyltrichlorosilane (OTS) SAMsalternately, by covalent bonding to form close packed two-dimensional nanoparticle arrays.

Youli Qi, Miao Chen, Shan Liang, Jing Zhao,Wu Yang, and Weimin Liu


688 Preparation of �-MnO2 Nanorods andCo3O4 Submicrooctahedrons by Molten SaltRoute

α-MnO2 nanorods and Co3O4 submicrooctahedrons have been obtained by simplemolten salt preparation route using cheap reagents.

Songlin Ran and Lian Gao

chemistry letters€¦ · 594 dehydration of concentrated acetic acid solutions by pervaporation...

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