Archive for the ‘Hot Articles’ Category

Hot Article: Understanding [4C+3C] cycloaddition

A group of Spanish scientists have investigated the intramolecular [4C+3C] cycloaddition reaction of allenedienes in this Dalton Transactions Hot article.

The researchers from Universidad de Santiago de Compostela and CSIC used density functional theory to look at the mechanism of the reaction when catalysed by PtCl2 and Au(I). They had a range of questions they wanted to answer, including ‘do the allene substituents affect the reaction mechanism? Are the PtCl2 and Au(I)-catalyzed processes exhibiting a similar profile? Why do some substrate/catalyst combinations give rise to [4 + 2] instead of [4 + 3] cycloadducts?’

Read the full article for FREE to find out what they discovered…

Theoretical study on intramolecular allene-diene cycloadditions catalyzed by PtCl2 and Au(I) complexes
Sergi Montserrat, Isaac Alonso, Fernando López, José L. Mascareñas, Agustí Lledós and Gregori Ujaque
Dalton Trans., 2011, DOI: 10.1039/C1DT11061F

Keep up to date with the latest news and research in inorganic chemistry: sign up to the Dalton Transactions e-alert, follow us on Twitter, and get the RSS feed.

Digg This
Reddit This
Stumble Now!
Share on Facebook
Bookmark this on Delicious
Share on LinkedIn
Bookmark this on Technorati
Post on Twitter
Google Buzz (aka. Google Reader)

Hot Article: Playing with the “P” in FLPs

Frustrated Lewis PairsFrustrated Lewis Pairs (FLPs) are usually a combination of a sterically hindered Lewis base (often phosphines or amines) and a sterically bulky Lewis acid (traditionally a bulky borane). The resulting ‘frustrated’ molecules are fantastically reactive – capable of cleaving dihydrogen, activating alkynes, boranes, olefins and even ring-opening THF and ethers. In their recent Dalton Trans. Hot Article, Doug Stephan and team play around with the Lewis acid element of this handy family and in the process they extend the activity of FLPs even further. Read more for free by clicking on the title of the article below and downloading the paper:

Chloro- and phenoxy-phosphines in frustrated Lewis pair additions to alkynes
Christopher B. Caputo, Stephen J. Geier, Eva Y. Ouyang, Christoph Kreitner and Douglas W. Stephan
Dalton Trans., 2011, DOI: 10.1039/C1DT11196E

Digg This
Reddit This
Stumble Now!
Share on Facebook
Bookmark this on Delicious
Share on LinkedIn
Bookmark this on Technorati
Post on Twitter
Google Buzz (aka. Google Reader)

Hot Article: Nickel(II) carboxylate chemistry

Researchers from the University of Barcelona make discrete polynuclear metal complexes containing nickel in this Dalton Transactions Hot article.

Albert Escuer and colleagues are working on improving the understanding of nickel/pyridyloximato chemistry, as they are interested in the paramagnetic properties of these compounds, which may make them useful in molecular spintronics and quantum computers.

Read the full article for FREE to find out more…

Use of 6-methylpyridine-2-carbaldehydeoxime in nickel(II) carboxylate chemistry: synthetic, structural and magnetic properties of penta and hexanuclear complexes
Albert Escuer, Gina Vlahopoulou and Franz A. Mautner
Dalton Trans., 2011, DOI: 10.1039/C1DT10657K

Find out more about the research in Albert Escuer’s group by visiting his website.

Keep up to date with the latest news and research in inorganic chemistry: sign up to the Dalton Transactions e-alert, follow us on Twitter, and get the RSS feed.

Digg This
Reddit This
Stumble Now!
Share on Facebook
Bookmark this on Delicious
Share on LinkedIn
Bookmark this on Technorati
Post on Twitter
Google Buzz (aka. Google Reader)

HOT Article: Serendipitous assembly of cage compounds

In this HOT article, Layfield and coworkers have studied the reactions of the heteroleptic lithium amide [Li3(μ-hmds)2(μ,μ-hpp)], where [hmds] =
hexamethyldisilazide and [hpp] = hexahydropyrimidopyrimidide, with MnCl2, CoCl2 or ZnBr2 resulting in the formation of the separated ion-pairs [MLi78-O)(μ,μ-hpp)6]+[A], which each consists of a {MLi7} oxo-centred cube structural motif (M = Mn, Co, Zn), with each face of the cube being bridged by an [hpp] ligand. The method potentially could permit access to a range of cage compounds with magnetic properties that are influenced by μ-amido ligands rather than by μ-(O-donor) ligands.

Read more about cage compounds and serendipitous assembly for FREE until the 4th October at:

Synthesis and structure of cationic guanidinate-bridged bimetallic {Li7M} cubes (M = Mn, Co, Zn) with inverse crown counter anions
Daniel Woodruff, Michael Bodensteiner, Daniel O. Sells, Richard. E. P. Winpenny and Richard A. Layfield
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C1DT10999E

Digg This
Reddit This
Stumble Now!
Share on Facebook
Bookmark this on Delicious
Share on LinkedIn
Bookmark this on Technorati
Post on Twitter
Google Buzz (aka. Google Reader)

The Future of MOFs?

Neil Champness

We all know that MOFs are everywhere now but where are they going? Neil Champness provides us with his expert point of view on the future of metal-organic frameworks  in his recently published Dalton Transactions Frontier article. Find out where the challenges currently lie and the opportunities on the horizon for these hot hot compounds.

You can even download and read Neil’s exciting Frontier for free until the 4th October! Just click on the article title below:
The future of metal–organic frameworks
Neil R. Champness  
Dalton Trans., 2011, DOI: 10.1039/C1DT11184A

Digg This
Reddit This
Stumble Now!
Share on Facebook
Bookmark this on Delicious
Share on LinkedIn
Bookmark this on Technorati
Post on Twitter
Google Buzz (aka. Google Reader)

Half-sandwich Ru compounds to combat cancer

Read the following Dalton Transactions Hot Article to find out which structures of Ru(II) half sandwich compounds are active as possible anti-cancer drugs and why face-capping ligand is all important in combating cancer cells……

Free to read until the 16th September!

New half sandwich-type Ru(II) coordination compounds characterized by the fac-Ru(dmso-S)3 fragment: influence of the face-capping group on the chemical behavior and in vitro anticancer activity
Ioannis Bratsos, Camilla Simonin, Ennio Zangrando, Teresa Gianferrara, Alberta Bergamo and Enzo Alessio
Dalton Trans., 2011, DOI: 10.1039/C1DT11043H

Digg This
Reddit This
Stumble Now!
Share on Facebook
Bookmark this on Delicious
Share on LinkedIn
Bookmark this on Technorati
Post on Twitter
Google Buzz (aka. Google Reader)

Hot Article: Producing polytopic ligands

Check out the recent Dalton Trans. Hot Article reporting new polytopic ligands, ddta and tptd. Each contains N-donor dipyridylamino binding sites as well as separate and distinct mono-aza-15-crown-5 binding sites. Murray and colleagues use these ligands to make spin crossover compounds…..read more in their hot article now – free to access until the 16th September.

Spin crossover in polymeric and heterometallic FeII species containing polytopic dipyridylamino-substituted-triazine ligands
Tamsyn M. Ross, Boujemaa Moubaraki, Stuart R. Batten and Keith S. Murray
Dalton Trans., 2011, DOI: 10.1039/C1DT10818B

Digg This
Reddit This
Stumble Now!
Share on Facebook
Bookmark this on Delicious
Share on LinkedIn
Bookmark this on Technorati
Post on Twitter
Google Buzz (aka. Google Reader)

Hot Article: Opening up oxidative addition

Feliu Maseras and co-workers from ICIQ in Tarragona, Spain examine the complicated, yet ubiquitous, process that is oxidative addition (OA). The team use DFT to systematically study OA of CH3Br to palladium bis-phosphine and mono-phosphine complexes. A number of trends can be identified, resulting in a complex picture where the nature of the phosphine and the solvent can be tuned to favor one of the two possible mechanisms, with the corresponding stereochemical implications that can be extrapolated to the behaviour of more sophisticated substrates. Access for free until the 16th September…………

Phosphine and solvent effects on oxidative addition of CH3Br to Pd(PR3) and Pd(PR3)2 complexes
Maria Besora, Christophe Gourlaouen, Brian Yates and Feliu Maseras
Dalton Trans., 2011, DOI: 10.1039/C1DT10983A

Digg This
Reddit This
Stumble Now!
Share on Facebook
Bookmark this on Delicious
Share on LinkedIn
Bookmark this on Technorati
Post on Twitter
Google Buzz (aka. Google Reader)

HOT Article: New heterojunction structured materials

In this HOT article, Yuliang Li and coworkers synthesized p–n axial heterojunction inorganic/organic semiconductor nanowire arrays on porous anodic aluminum oxide (AAO) templates via electrochemical deposition. This novel synthesis is based on a common concept of using an AAO template. The electrical properties of the heterojunctions of these organic–inorganic materials were investigated, indicating a diode nature and a rectifying feature. These heterojunction nanowire arrays are at the frontier of the materials field, for next-generation electrical and optoelectronic devices.

Read more for FREE until 24th September about these nanowire arrays at:
Synthesis and characterization of axial heterojunction inorganic–organic semiconductor nanowire arrays
Nan Chen, Xuemin Qian, Haowei Lin, Huibiao Liu, Yongjun Li and Yuliang Li
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C1DT10926J

Digg This
Reddit This
Stumble Now!
Share on Facebook
Bookmark this on Delicious
Share on LinkedIn
Bookmark this on Technorati
Post on Twitter
Google Buzz (aka. Google Reader)

HOT Article: Role of Cu binding in neurodegenerative disorders

The formation of peptide or protein aggregates is a common feature of many different forms of neurodegenerative disorders including Alzheimer’s disease, Parkinson’s disease and prion diseases. It is also widely accepted that various metal ions can play a significant role in the conformational changes of these peptides/proteins.

In this HOT article, Kállay and co-workers report on the synthesis and study of the copper complexes of rIAPP fragments. First of all the terminally protected tridecapeptide rIAPP(17–29) was investigated in which the potentially metal binding amino acid residues are located in the N-terminus. The surprisingly high affinity of this peptide towards complexation with copper(II) promoted a systematic study on the shorter fragments including rIAPP(17–22) (Ac-VRSSNN-NH2), rIAPP(17–20) (Ac-VRSS-NH2), its mutant peptides (Ac-VASSNH2 and Ac-VRAA-NH2) and rIAPP(19–22) (Ac-SSNN-NH2). The peptides can be classified into two different categories: (i) the tetrapeptides Ac-VRSS-NH2, Ac-VASS-NH2 and Ac-VRAA-NH2 can interact with copper(II) only under strongly alkaline conditions (pH > 10.0) and the formation of only one species with four amide nitrogen coordination can be detected; (ii) the peptides Ac-VRSSNNLGPVLPP-NH2, Ac-VRSSNN-NH2 and Ac-SSNN-NH2 can form complexes above pH 6.0 with the major stoichiometries [CuH−2L], [CuH−3L] and [CuH−4L]2−. The data supports the idea that  rIAPP(17–29) can interact with copper(II) ions under physiological conditions and the SSNN tetrapeptide fragment can be considered as the shortest sequence responsible for metal binding.

Read more for FREE until 21st September at:
Copper(II) complexes of rat amylin fragments
Csilla Kállay, Ágnes Dávid, Sarolta Timári, Eszter Márta Nagy, Daniele Sanna, Eugenio Garribba, Giovanni Micera, Paolo De Bona, Giuseppe Pappalardo, Enrico Rizzarelli and Imre Sóvágó
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C1DT10835B

Digg This
Reddit This
Stumble Now!
Share on Facebook
Bookmark this on Delicious
Share on LinkedIn
Bookmark this on Technorati
Post on Twitter
Google Buzz (aka. Google Reader)