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A robust catalyst that produces hydrogen from ammonia-boranes with high efficiency under atmospheric conditions has been developed by Spanish scientists.
The search for new energy sources to substitute depleting fossil fuels and decrease greenhouse gas emissions is a high priority. One of the best pollution-free alternatives to coal and oil is hydrogen However; a different and very important concern arises with using hydrogen: safety.
Incorporating hydrogen into chemical compounds, such as ammonia-borane (NH3BH3), that can store and release it in a controlled manner could be a way of overcoming safety issues. Catalysts based on metals including titanium, ruthenium or rhodium can efficiently release up to one equivalent of hydrogen gas, but it must be carried out under an inert atmosphere.
3 equivalents of hydrogen are released from the ammonia-borane store
Now Maria Angeles Garralda and her team at University of Pais Vasco in Spain have demonstrated the first homogenous catalysis reaction using an iridium catalyst for hydrolysing ammonia-boranes, which produces up to three equivalents of hydrogen in a very efficient reaction. As well as being more efficient than previous systems, the iridium catalyst has the added advantage that it is stable in water and air, so does not require an inert atmosphere.
‘The fact that this system was not active under anhydrous conditions and was, however, extremely efficient and stable in the presence of water was very surprising,’ says Maria Angeles Garralda. ‘The great stability in the presence of air and water and the great activity of this homogeneous catalyst will help to understand the mechanisms of hydrogen production’.
The understanding of the mechanism of this type of reactions is vital for the future development of more efficient and cheaper catalysts to generate hydrogen in fuel cells.
‘This homogenous catalytic system suggests that finer control over rate and product distribution might be possible in the future,’ points out Andrew Weller, an expert on organometallic chemistry and catalysis at University of Oxford, UK. ‘Ultimately, energy efficient re-hydrogenation strategies and cheaper, long-lived, immobilised catalysts are key targets; and research such as presented here suggests new avenues by which the latter of these goals might be achieved.’
Lorena Tomas Laudo
A hydridoirida-Β-diketone as an efficient and robust homogeneous catalyst for the hydrolysis of ammonia–borane or amine–borane adducts in air to produce hydrogen
Roberto Ciganda, María A. Garralda, Lourdes Ibarlucea, Elena Pinilla and M. Rosario Torres, Dalton Trans., 2010
DOI: 10.1039/c0dt00091d
Congratulations to Martin Bendle (University of Bristol) for winning the Dalton Transactions Poster Prize at the RSC Main Group Chemistry Discussion Group Meeting, which was held in Oxford on the 9th of July this year.
The title of the Martin’s winning poster was ‘Phosphoranimines: New Routes to Polyphosphazenes and Novel Reactivity’.
New Hot article published describing new insights into the mechanism of enzymatic activation of dioxygen by metal active sites, elucidated by high-pressure experiments:
Reinvestigation of the formation of a mononuclear Fe(III) hydroperoxido complex using high pressure kinetics
Thomas Nebe, Alexander Beitat, Christian Würtele, Carlos Dücker-Benfer, Rudi van Eldik, Christine J. McKenzie and Siegfried Schindler, Dalton Trans., 2010
DOI: 10.1039/c0dt00247j
READ NOW! This article will be free to access until the 18th of August.
Congratulations to Julien Panetier (Heriot-Watt University) for winning the Dalton Transactions Poster Prize at the 44th Annual Universities of Scotland Inorganic Chemistry (USIC) Conference, which was held in Durham on the 8th and 9th of July this year.
The title of the Julien’s winning poster was ‘Hydrodefluorination of Fluoroaromatics by [RuH2(CO)(NHC)(PPh3)2]: An Explanation for the 1,2-regioselectivity’.
We are delighted to announce that Dalton Transactions is introducing a new Asian Lectureship Award to accompany our already existing American and European/African Lectureship Awards. The call for nominations for this prestigious award is now open!
We already have in existence two Lectureship Awards spanning the Americas and Europe and Africa, and this new award will cover all of Asia and Australasia:
Call for Nominations!
Nominations are invited for the Dalton Transactions Asian Lectureship, given to recognise the achievements of an emerging Asian/Australasian inorganic chemist.
Key features of the prize
• The recipient of the award will be asked to present a lecture.
• The award will be presented to the recipient at the award lecture.
• They will also be asked to contribute a Perspective article to the journal and will have their work showcased on the back cover of the issue in which their article is published.
• The Dalton Transactions Editorial Office will provide the sum of £1500 to the recipient for travel and accommodation costs.
• The award will be made once a year.
• There will be one recipient of the award per year.
Nomination
Nominations should consist of a nomination letter, a letter seconding the nomination, a CV (maximum 5 pages) and a statement from the candidate (not more than one page) describing their most significant research contributions. Those wishing to make a nomination should send details by email to the Dalton Transactions Editorial Office by 15 September 2010.
Qualification
The recipient of the award should should be in the earlier stages of their scientific career, i.e. in the first 12 years of receiving their doctorate or equivalent degree.
Previous winners of the European/African Lectureship include:
2010 Karsten Meyer (Friedrich-Alexander-University of Erlangen-Nuremberg)
2009 Simon Aldridge (University of Oxford)
2008 Kay Severin (EPFL, Switzerland)
2007 Andrew Weller (then University of Bath, since moved to the University of Oxford)
Previous winners of the American Lectureship include:
2009 Francois Gabbai (Texas A & M University)
2008 Dan Mindiola (Indiana University)
2007 Geoff Coates (Cornell University)
2006 John Hartwig (University of Illinois at Urbana-Champaign)
In celebration of our impressive performance in the recently released ISI® impact factors, we are offering FREE online access to the top ten most cited articles in 2009 published in Dalton Transactions during 2007 to 2008. These excellent papers contributed to our remarkable growth.
Newly-released ISI citation data confirms Dalton Transactions is one of the leading journals in its field. The journal’s impact factor has grown by an impressive 35% in the last 4 years to, leaping above 4 for the first time to reach a value of 4.08.
Why not take a look for yourself and check out the big name authors and hot topics?
Don’t delay – this free offer is only available until 11th August 2010!
Free articles:
Covalent radii revisited
Beatriz Cordero, Verónica Gómez, Ana E. Platero-Prats, Marc Revés, Jorge Echeverría, Eduard Cremades, Flavia Barragán and Santiago Alvarez, Dalton Trans., 2008, 2832
DOI: 10.1039/b801115j
Ammonia–borane: the hydrogen source par excellence?
Frances H. Stephens, Vincent Pons and R. Tom Baker, Dalton Trans., 2007, 2613
DOI: 10.1039/b703053c
Antitumour metal compounds: more than theme and variations
Michael A. Jakupec, Mathea S. Galanski, Vladimir B. Arion, Christian G. Hartinger and Bernhard K. Keppler, Dalton Trans., 2008, 183
DOI: 10.1039/b712656p
Utilisation of CO2 as a chemical feedstock: opportunities and challenges
Michele Aresta and Angela Dibenedetto, Dalton Trans., 2007, 2975
DOI: 10.1039/b700658f
Lanthanide-based emitting materials in light-emitting diodes
Ana de Bettencourt-Dias, Dalton Trans., 2007, 2229
DOI: 10.1039/b702341c
Tuning Lewis acidity using the reactivity of frustrated Lewis pairs: facile formation of phosphine-boranes and cationic phosphonium-boranes
Gregory C. Welch, Lourdes Cabrera, Preston A. Chase, Emily Hollink, Jason D. Masuda, Pingrong Wei and Douglas W. Stephan, Dalton Trans., 2007, 3407
DOI: 10.1039/b704417h
Design and its limitations in the construction of bi- and poly-nuclear coordination complexes and coordination polymers (aka MOFs): a personal view
R. Robson, Dalton Trans., 2008, 5113
DOI: 10.1039/b805617j
Structural variation in copper(I) complexes with pyridylmethylamide ligands: structural analysis with a new four-coordinate geometry index, τ4
Lei Yang, Douglas R. Powell and Robert P. Houser, Dalton Trans., 2007, 955
DOI: 10.1039/b617136b
Asymmetric hydroamination of non-activated carbon–carbon multiple bonds
Isabelle Aillaud, Jacqueline Collin, Jérôme Hannedouche and Emmanuelle Schulz, Dalton Trans., 2007, 5105
DOI: 10.1039/b711126f
Joint spectroscopic and theoretical investigations of transition metal complexes involving non-innocent ligands
Kallol Ray, Taras Petrenko, Karl Wieghardt and Frank Neese, Dalton Trans., 2007, 1552
DOI: 10.1039/b700096k
We are delighted to announce that Paul Chirik has been awarded the 2010 Dalton Transactions Americas Lectureship, in recognition of his internationally recognised contributions to the field of homogeneous catalysis.
The aim of the Dalton Transactions lectureship is to enhance communication between some of the best researchers in inorganic chemistry, by offering the awardee an opportunity to present their work and subsequently spend time interacting with students, postdocs and faculty at a host university. Professor Chirik will present the Dalton Transactions Lecture at UC Berkeley early in 2011.
Paul Chirik is currently the Peter J. W. Debye Professor of Chemistry at Cornell University, NY, USA. His work is focussed on homogeneous catalysis and small molecule activation using transition metal complexes.Paul is moving to Princeton (NJ, USA) in January 2011 to take up the position of Edward S. Sanford Professor of Chemistry.
You can read some of Professor Chirik’s recent research now:
Dinitrogen functionalization with bis(cyclopentadienyl) complexes of zirconium and hafnium
Paul J. Chirik, Dalton Trans., 2007, 16, DOI: 10.1039/b613514e
Amineborane dehydrogenation promoted by isolable zirconium sandwich, titanium sandwich and N2 complexes
Doris Pun, Emil Lobkovsky and Paul J. Chirik, Chem. Commun., 2007, 3297, DOI: 10.1039/b704941b
‘Professor Paul Chirik is an outstanding scholar who, in his relatively short independent research career, has established himself as one of the world’s pre-eminent young inorganic chemists.’ says Professor John Arnold, Dalton Transactions Associate Editor for the Americas.
‘His research focuses on the discovery of homogenous catalysis and small molecule activation effected by well-defined transition metal complexes, with the goal of carrying out energy-efficient chemical transformations that minimize byproducts, separation of waste and eliminate precious metals. The UC Berkeley Chemistry Department is honored to have him visit as the 2010/11 Dalton Transactions Lecturer and we are grateful to the RSC for their support of this award.’
Find out more about Paul Chirik on his website at Cornell University!
Royal Society of Chemistry: Inorganic Biochemistry Discussion Group 2010 Meeting – Metal Homeostasis
10 and 11 September 2010 University of Newcastle, UK
Deadline for registration is 6th August 2010
The annual RSC IBDG meeting will be on the subject of metal homeostasis and feature talks from speakers including Dennis Winge (University of Utah), Claudia Blindauer (University of Warwick) and Tom O’Halloran (Northwestern University).
Dalton Transactions is proud to be supporting the meeting and sponsoring a poster prize.
It is estimated that more than one third of all proteins require a metal ion for structure or function. Interest has grown in understanding how the correct metal is acquired by the correct protein. Given that many essential metals can be toxic if not managed correctly within a cell, mechanisms have evolved to ensure the safe delivery of metals to target proteins. This meeting will focus on the current understanding of the sequestering, sensing, chaperoning and storing of metals in biological systems.
Congratulations to Caroline Knapp (Oxford University) for winning the Dalton Transactions Poster Prize at the RSC Coordination Chemistry Discussion Group Meeting, which was held in Bath on the 1st and 2nd of July this year. The title of the Caroline’s winning poster was ‘Solution reactivity studies of Group 15 Zintl ions towards post-transition metal halides’.
