02 Jul 13:09

Multi-shelled hollow micro-/nanostructures

Chem. Soc. Rev., 2015, Advance Article
DOI: 10.1039/C5CS00344J, Review Article
Jian Qi, Xiaoyong Lai, Jiangyan Wang, Hongjie Tang, Hao Ren, Yu Yang, Quan Jin, Lijuan Zhang, Ranbo Yu, Guanghui Ma, Zhiguo Su, Huijun Zhao, Dan Wang
Recent advances in multi-shelled hollow micro-/nanostructures were reviewed, and the correlation between their geometric properties and specific performance was highlighted.
To cite this article before page numbers are assigned, use the DOI form of citation above.
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02 Jul 11:23

Enhanced Performance of Organic Solar Cells with Increased End Group Dipole Moment in Indacenodithieno[3,2-b]thiophene-Based Molecules

by Jeremy J. Intemann, Kai Yao, Feizhi Ding, Yunxiang Xu, Xukai Xin, Xiaosong Li, Alex K.-Y. Jen

Four new molecular donors are reported using a D1-A-D2-A-D1 structure, where D1 is an oligiothiophene, A is a benzothiadiazole, and D2 is indacenodithieno[3,2-b]thiophene. The resulting materials provide efficiencies as high as 6.5% in organic solar cells, without the use of solvent additives or thermal/solvent annealing. A strong correlation between the end group (D1-A) dipole moment and the fill factor (FF), mobility, and loss in the open-circuit voltage (VOC) is observed. Indacenodithieno[3,2-b]thiophene-fluorobenzothiadiazole-terthiophene (IDTT-FBT-3T) possesses the largest end group dipole moment, and in turn, has the highest mobility, FF, and power conversion efficiency in devices. It also has a similarly high VOC (0.95 V) to the other materials (0.93–0.99 V), despite possessing a much higher highest occupied molecular orbital (HOMO) energy level.

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Four new ladder-type molecular donors are reported with varying end groups and their photovoltaic properties are explored. It is found that utilizing end groups with larger ground-state dipole moments results in significantly enhanced fill factors and decreased voltage losses in devices.

03 Jul 21:00

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03 Jul 17:04

New Ethereal Watercolor and Black Ink Cats That Fade into the Canvas by Endre Penovác

by Christopher Jobson

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We continue to be awed by Serbian artist Endre Penovác's ability to somehow control the unforgiving nature of water on paper to produce ghostly paintings of felines. As the mixture of water and black ink bleeds in every direction it appears to perfectly mimic the cat’s fur. In his newest pieces Penovác introduces elements of color and negative space to add a slightly new dimension. You can see more of his recent work on Facebook and Saatchi Art.

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03 Jul 16:42

(via 4gifs:video)



(via 4gifs:video)

03 Jul 11:30

18F-Labeling of Aryl-SCF3, -OCF3 and -OCHF2 with [18F]Fluoride

by Tanatorn Khotavivattana, Stefan Verhoog, Matthew Tredwell, Lukas Pfeifer, Samuel Calderwood, Katherine Wheelhouse, Thomas Lee Collier, Véronique Gouverneur

Abstract

We report that halogenophilic silver(I) triflate permits halogen exchange (halex) nucleophilic 18F-fluorination of aryl-OCHFCl, -OCF2Br and -SCF2Br precursors under mild conditions. This AgI-mediated process allows for the first time access to a range of 18F-labeled aryl-OCHF2, -OCF3 and -SCF3 derivatives, inclusive of [18F]riluzole. The 18F-labeling of these medicinally important motifs expands the radiochemical space available for PET applications.

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A halogen exchange (halex) 18F-fluorination process offers access for the first time to 18F-labeled arylOCF3, arylOCHF2 and arylSCF3, three motifs of established medicinal importance in PET radiotracers. The use of silver(I) triflate is critical to permit 18F-labeling under mild conditions.

03 Jul 11:20

Direct Imaging of Highly Anisotropic Photogenerated Charge Separations on Different Facets of a Single BiVO4 Photocatalyst

by Jian Zhu, Fengtao Fan, Ruotian Chen, Hongyu An, Zhaochi Feng, Can Li

Abstract

Spatially resolved surface photovoltage spectroscopy (SRSPS) was employed to obtain direct evidence for highly anisotropic photogenerated charge separation on different facets of a single BiVO4 photocatalyst. Through the controlled synthesis of a single crystal with preferentially exposed {010} facets, highly anisotropic photogenerated hole transfer to the {011} facet of single BiVO4 crystals was observed. The surface photovoltage signal intensity on the {011} facet was 70 times stronger than that on the {010} facets. The influence of the built-in electric field in the space charge region of different facets on the anisotropic photoinduced charge transfer in a single semiconductor crystal is revealed.

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Spatially resolved surface photovoltage spectroscopy (SRSPS) was employed to obtain first direct evidence of highly anisotropic photogenerated charge separations on different facets of a single BiVO4 photocatalyst. The results provide guidance to optimizing the performance of photocatalysts and solar cells.

03 Jul 08:10

Dimeric TADDOL Phosphoramidites in Asymmetric Catalysis: Domino Deracemization and Cyclopropanation of Sulfonium Ylides

by Sebastian Klimczyk, Antonio Misale, Xueliang Huang, Nuno Maulide

Abstract

A gold-catalyzed asymmetric cyclopropanation of unactivated olefins with sulfonium ylides in the presence of a bimetallic catalyst with a novel dimeric TADDOL-phosphoramidite ligand is reported. This transformation allows a rare gold-catalyzed dynamic deracemization of chiral racemic substrates, where the same catalyst is responsible for several synergistic tasks in solution. The products are useful building blocks in synthesis and enable expeditious access to natural products.

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Master of all trades: A gold-catalyzed asymmetric cyclopropanation of unactivated olefins with sulfonium ylides has been developed that employs a bimetallic catalyst with a novel dimeric TADDOL ligand. This transformation allows a unique gold-catalyzed dynamic deracemization of chiral racemic substrates, with the products being useful building blocks in synthesis.

03 Jul 07:20

Aryne-Induced Novel Tandem 1,2-Addition/(3+2) Cycloaddition to Generate Imidazolidines and Pyrrolidines

by Sharada P. Swain, Yi-Chun Shih, Shwu-Chen Tsay, Joby Jacob, Chun-Cheng Lin, Kuo Chu Hwang, Jia-Cherng Horng, Jih Ru Hwu

Abstract

A new “single-flask” method was developed for the synthesis of imidazolidines and pyrrolidines with high stereoselectivity. First, a Schiff base was arylated with an aryne. Second, an intramolecular proton transfer took place from the methylene position to the anionic aryne ring. Third, the resultant ylide reacted with a second equivalent of the same Schiff base in situ or an electron-deficient alkene through a (3+2) cycloaddition. These sequential tandem 1,2-addition/(3+2) cycloaddition reactions led to the desired heterocycles in 63–88 % yields.

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Two steps in one flask: A sequence of arylation of a Schiff base, an intramolecular proton transfer from the methylene position to the anionic aryne ring, and reaction of the resulting ylide with either a second equivalent of Schiff base or an electron-deficient alkene in a (3+2) cycloaddition generates imidazolidines and pyrrolidines in high stereoselectivity and 63–88 % yields.

02 Jul 20:47

22 Massachusetts towns will build their own gigabit internet service

by Jon Fingas
The FCC made it clear that towns should have the freedom to build their own broadband services, and one cooperative group is determined to take advantage of that liberty. WiredWest has gained the support of 22 Massachusetts towns for a municipal broa...
02 Jul 18:42

Don’t bother the coder

by CommitStrip



02 Jul 18:35

saracinspiration: rjsalmond: whatiremembered:I meant to post...















saracinspiration:

rjsalmond:

whatiremembered:

I meant to post all of these, but they didn’t go up for some reason…

Calvin’s dad was totally a little Calvin when he was growing up and now he’s all responsible and stuff but really deep down he hasn’t changed.

The last one was always my favorite growing up

02 Jul 18:20

Chiral Memory in Silylium Ions

by P. Ducos, V. Liautard, F. Robert, Y. Landais

Abstract

The configurational stability of the chiral silicon center in Lewis base-stabilized silyliums has been studied. Complete retention of configuration at silicon is observed at low temperature in silylium ions stabilized by lone-pair interactions. In contrast, loss of chiral memory is observed with systems involving π-interactions. Epimerization of the silicon center was observed by simply allowing equilibration of the diastereomeric silyliums at RT or by adding a catalytic amount of a chelating solvent. Conditions for the transfer of axial chirality to Si-centered chirality were shown to rely on the strength of the Lewis base-silylium ion interaction.

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Still fresh in silylium’s memory: The configurational stability of the chiral silicon center in Lewis base-stabilized silyliums has been studied. Complete retention of configuration at silicon is observed at low temperature in silylium ions stabilized by lone-pair interactions. In contrast, loss of chiral memory is observed with systems involving π-interactions. Epimerization of the silicon center was observed by simply allowing equilibration of the diastereomeric silyliums at RT or by adding a catalytic amount of an ether.

02 Jul 17:12

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02 Jul 15:03

cutebiology: nursejpg: !!!!!!!!!!!!!! frog important

by villeashell


cutebiology:

nursejpg:

!!!!!!!!!!!!!! frog

important

02 Jul 13:56

Carbon Dioxide Conversion to Methanol over Size-Selected Cu4 Clusters at Low Pressures

by Cong Liu, Bing Yang, Eric Tyo, Soenke Seifert, Janae DeBartolo, Bernd von Issendorff, Peter Zapol, Stefan Vajda and Larry A. Curtiss

TOC Graphic

Journal of the American Chemical Society
DOI: 10.1021/jacs.5b03668
02 Jul 11:27

Palladium-catalyzed aerobic oxidative cross-coupling of arylhydrazines with terminal alkynes

Chem. Commun., 2015, Accepted Manuscript
DOI: 10.1039/C5CC04111B, Communication
Yingwei Zhao, Qiuling Song
A palladium-catalyzed Sonogashira-type aerobic oxidative coupling of arylhydrazines with aryl acetylenes via C-N bond cleavage has been developed; internal arylalkynes were afforded with a broad substrate scope. This reaction proceeds...
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02 Jul 10:53

Total Synthesis of Shishijimicin A

by K. C. Nicolaou, Zhaoyong Lu, Ruofan Li, James R. Woods and Te-ik Sohn

TOC Graphic

Journal of the American Chemical Society
DOI: 10.1021/jacs.5b05575
04 Jul 18:00

alphaaraptor: original post

04 Jul 16:18

maudit: The Making of The Shining by Vivian Kubrick (x)













maudit:

The Making of The Shining by Vivian Kubrick (x)

04 Jul 06:50

"I’m tired of people romanticizing overexertion. Exhausted is not the new chic, coffee (though a..."

“I’m tired of people romanticizing overexertion. Exhausted is not the new chic, coffee (though a delicious necessity) is not a food group, and running on fumes is not admirable. Why do we hold pedestals for sleepless nights, breakdowns, and inner turmoil? Are those really things to aspire to? Self-care. Balance. The ability to know when your body, mind, and spirit need to take a step back. Those are things we should admire. We have to stop blurring the line between ‘commitment’ and self-endangerment because too many people are burning out before they have a chance to truly shine.”

- my opinion on the way we envision hard work and the way we should live life  (via runningmandz)
03 Jul 18:20

Globalization and the Environment Collide in Mary Iverson’s Mixed Media Paintings of Shipping Containers

by Kate Sierzputowski

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Mary Iverson fills natural and manmade landscapes with colorful shipping containers, objects haphazardly stacked on each other and taking up a majority of the otherwise tranquil scenes. The containers and boxes are cross-hatched with overlaid lines, connecting them a predetermined pattern seemingly known only by the artist.

Iverson explains her work by saying, “My paintings are colorful abstractions that spring from the theme of the industrial shipping terminal. The canvases feature mass accumulations of shipping containers and container cranes in various perspectives. My work employs a network of searching perspective lines and layers of interlocking, colorful planes and rectangles that suggest both deep space and flat surface.”

Part painting and part collage (the pieces often incorporate found photography), her artworks address what happens when globalization and the environment collide, material possessions doubling and tripling until they spill into the natural world around them. The Seattle-based painter gathers the bulk of her source imagery for her sketches through yearly trips to parks across the country, camping and photographing the landscape around her.

Iverson received her MFA in Painting from the University of Washington in 2002 and currently teaches painting and drawing at Skagit Valley College in Mount Vernon, WA as a tenured faculty member. Iverson has two upcoming October exhibitions, one at Gallery FB69 in Munster, Germany and another at G. Gibson Gallery in Seattle. Check out more images of Iverson’s work on her Instagram here. (via Juxtapoz where she’s the cover artist for the August issue)

Valley 8 x 10, collage on panel, 2010, Iverson

Settlement,12 x 12 inches, acrylic, ink, found photograph on panel, 2014

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Grand Canyon, 8 x 10 inches, collage on panel, 2010, Iverson

03 Jul 18:02

The most suitable hours to work in an open space

by CommitStrip
Today, Intel is back on CommitStrip! They’re building an interesting platform for the Internet of Things, with their Edison technology and the Curie module, specifically designed for the creators of devices. Visit the Intel Developer Zone for access to Developer Kits and support, and maybe find a solution to work in peace in the open space ;).


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03 Jul 16:41

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(via adoru11)

03 Jul 16:17

Naphtho[2,1-b:3:4-b']bisthieno[3,2-b][1]benzothiophene-Based Semiconductors for Organic Field-Effect Transistors

J. Mater. Chem. C, 2015, Accepted Manuscript
DOI: 10.1039/C5TC00631G, Paper
Man Shing Wong, Zhaoguang Li, Ji Zhang, Kai Zhang, Weifeng Zhang, Lei Guo, Jianyao Huang, Gui Yu
A novel series of air-stable and highly extended [small pi]-conjugated naphtho[2,1-b:3,4-b']bisthieno[3,2-b][1]benzothiophene derivatives, NBTBT-n (n = 6, 8, 10, and 12) and NBTBTF-10 was developed. The influence of various alkoxy-side groups including...
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