scholarly journals Improved syntheses of high hole mobility phthalocyanines: A case of steric assistance in the cyclo-oligomerisation of phthalonitriles

2012 ◽  
Vol 8 ◽  
pp. 120-128 ◽  
Author(s):  
Daniel J Tate ◽  
Rémi Anémian ◽  
Richard J Bushby ◽  
Suwat Nanan ◽  
Stuart L Warriner ◽  
...  
Keyword(s):  
Hexagonal Phase ◽  
Time Of Flight ◽  
Hole Mobility ◽  
High Time ◽  
High Yield ◽  
Metal Free ◽  
Temperature Range

It has been shown that the base-initiated cyclo-oligomerisation of phthalonitriles is favoured by bulky α-substituents making it possible to obtain the metal-free phthalocyanine directly and in high yield. The phthalocyanine with eight α-isoheptyl substituents gives a high time-of-flight hole mobility of 0.14 cm2·V−1·s−1 within the temperature range of the columnar hexagonal phase, that is 169–189 °C.

High Yield Controlled Synthesis of Nano-Graphene Oxide by Water Electrolytic Oxidation of Glassy Carbon for Metal-Free Catalysis

ACS Nano ◽  
2019 ◽  
Vol 13 (8) ◽  
pp. 9482-9490 ◽  
Author(s):  
Qinwei Wei ◽  
Songfeng Pei ◽  
Guodong Wen ◽  
Kun Huang ◽  
Zhaohong Wu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Glassy Carbon ◽  
High Yield ◽  
Controlled Synthesis ◽  
Metal Free ◽  
Electrolytic Oxidation ◽  
Nano Graphene

Regioselective 1,4-conjugate aza-Michael addition of dienones with benzotriazole

2017 ◽  
Vol 23 (4) ◽  
Author(s):  
Zheng Li ◽  
Tianpeng Li ◽  
Rugang Fu ◽  
Jingya Yang
Keyword(s):  
Transition Metal ◽  
Michael Addition ◽  
Potassium Acetate ◽  
High Yield ◽  
Metal Free ◽  
Mild Conditions

AbstractThe regioselective 1,4-conjugate aza-Michael addition of dienones with benzotriazole catalyzed by potassium acetate is described. A series of 3-(benzotriazol-1-yl)-1,5-diarylpent-4-en-1-ones were efficiently synthesized under mild conditions. This protocol has advantages of transition-metal free catalyst, high yield and high regioselectivity.

Metal-Free 2D/2D Heterojunction of Graphitic Carbon Nitride/Graphdiyne for Improving the Hole Mobility of Graphitic Carbon Nitride

2018 ◽  
Vol 8 (16) ◽  
pp. 1702992 ◽  
Author(s):  
Ying-Ying Han ◽  
Xiu-Li Lu ◽  
Shang-Feng Tang ◽  
Xue-Peng Yin ◽  
Zhen-Wei Wei ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Hole Mobility ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Metal Free

Hole mobility characterization of DNA biopolymer by time-of-flight technique

2012 ◽  
Vol 101 (15) ◽  
pp. 153701 ◽  
Author(s):  
Ting-Yu Lin ◽  
I-Ching Chen ◽  
Yu-Chueh Hung
Keyword(s):  
Time Of Flight ◽  
Hole Mobility

Visible light mediated, metal-free carbene transfer reactions of diazoalkanes with propargylic alcohols

2019 ◽  
Vol 55 (33) ◽  
pp. 4881-4884 ◽  
Author(s):  
Feifei He ◽  
Rene M. Koenigs
Keyword(s):  
Visible Light ◽  
Transfer Reactions ◽  
High Yield ◽  
Propargylic Alcohols ◽  
Metal Free ◽  
Sterically Demanding ◽  
Donor Acceptor ◽  
Carbene Transfer

The photolysis of donor–acceptor diazoalkanes in the presence of propargylic alcohols furnishes valuable, sterically demanding tetra-substituted cyclopropenes in high yield under metal-free conditions.

Charge motion and trapping in molecularly doped hole transporters

2002 ◽  
Vol 725 ◽  
Author(s):  
H.H. Fong ◽  
K.C. Lun ◽  
S.K. So
Keyword(s):  
Electric Field ◽  
Time Of Flight ◽  
Hole Mobility ◽  
Computational Results ◽  
Charge Motion ◽  
Hole Conduction

AbstractThe charge transporting properties of N, N'-dipheny l-N, N'-bis(3-methylphenyl)-(1,1'-biphenyl)-4,4'-diamine (TPD), TPD doped with 5,6,11,12- tetraphenylnaphthacene (rubrene), and TPD doped with 4-(dicyanomethylene)-2-methyl-6-(pdimethylaminostyryle) 4H-pyran (DCM1) were examined by time-of-flight (TOF) technique between 180-300K. The dependence of the mobility on electric field and temperature for undoped and doped TPD was investigated. Reductions in hole mobility shows that both dopants act as hole traps in TPD. Computational results of TPD also account for the effective hole conduction in pristine TPD film.

The effect of hydrogen on the formation of carbon nanotubes and fullerenes

1995 ◽  
Vol 10 (8) ◽  
pp. 1977-1983 ◽  
Author(s):  
X.K. Wang ◽  
X.W. Lin ◽  
M. Mesleh ◽  
M.F. Jarrold ◽  
V.P. Dravid ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Carbon Nanotubes ◽  
Growth Model ◽  
Arc Discharge ◽  
Time Of Flight ◽  
Gas Pressure ◽  
High Yield ◽  
Nanotube Bundles ◽  
Flight Mass Spectrometry ◽  
Novel Method

A novel method to synthesize “clean” carbon nanotubes with relatively high yield in a hydrogen arc discharge has been developed. The quality and yield of the tubes depend sensitively on the gas pressure in the arc discharge. Sharp, open-ended nanotubes with clear lattice fringes at the edges and empty interiors have been observed. The existence of these frozen-open-ended tubes as part of nanotube-bundles provides evidence for an open-ended growth model for nanotubes. Using time of flight mass spectrometry, it was found that fullerenes, such as C60 and C70, are almost absent from the soot collected in the hydrogen arc discharge. The effect of hydrogen on the formation of fullerenes, both in the laboratory and in space, will be discussed.

The phosphinoboration of carbodiimides, isocyanates, isothiocyanates and CO2

2017 ◽  
Vol 46 (33) ◽  
pp. 10876-10885 ◽  
Author(s):  
Stephen J. Geier ◽  
James H. W. LaFortune ◽  
Diya Zhu ◽  
Stephanie C. Kosnik ◽  
Charles L. B. Macdonald ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Transition Metal ◽  
High Yield ◽  
Metal Free

The transition metal-free addition of phosphinoboronate ester Ph2PBpin (pin = 1,2-O2C2Me4) to heterocumulenes including carbodiimides, isocyanates, isothiocyanates and carbon dioxide proceeds with remarkable selectivity to give products in high yield.

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