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Hydrazine based hydrogen storage materials

20 Jul 2012

This recent Dalton Transactions cover is by Nikolas Kaltsoyannis and team from UCL and my PhD supervisor, David Antonelli. Doing a PhD in hydrogen storage materials myself, I thought that this would be a good opportunity to blog about some of our group’s research…

The big challenge in hydrogen storage materials research is to develop materials that have a high storage capacity, are fully reversible, and can operate at ambient temperature and pressure. Our group have previously reported chromium hydrazide gels that store hydrogen via the Kubas interaction. The material has a gravimetric hydrogen storage performance of 3.2 wt% at 298K which corresponds to a volumetric capacity of 40.8 kg H₂/m³, meeting the US Department of Energy’s 2015 target for volumetric density (40 kg/m³).

In this latest Dalton Transactions article, the Cr(II) binding sites were studied computationally to further study the interaction with H₂. Strong evidence suggests that the metal-H₂ interaction is Kubas type (confirming our previously reported results) – the Kubas interaction between a transition metal and H₂ involves σ-donation from the filled H‑H σ-bonding orbital into an empty transition metal d orbital, and is strengthened by back-donation from a filled metal d orbital into the vacant σ* orbital of the H₂ molecule. The binding model is similar to the Dewar-Chatt-Duncanson model for the bonding of CO ligands to transition metals.

Kaltsoyannis and team extended the system to incorporate other transition metal binding sites: Ti(II), V(II) and Mn(II). They found that H₂ did not bind to Mn(II) suggesting that Mn(II) materials may not perform well for hydrogen storage. Hydrogen did bind to V(II) and Ti(II) and calculations indicate 5 and 7 wt% gravimetric storage respectively, surpassing the DOE’s goal for gravimetric storage.

This paper shows that materials based on V(II) and Ti(II) could potentially perform better than the experimentally-realised chromium hydrazide gels.

To find out more, read the full Dalton Transactions article now…

The Kubas interaction in M(II) (M = Ti, V, Cr) hydrazine-based hydrogen storage materials: a DFT study
Claire V. J. Skipper, Ahmad Hamaed, David M. Antonelli and Nikolas Kaltsoyannis

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Articles from around the world: Korea

06 Jul 2012

This month we are highlighting some of the excellent articles published in Dalton Transactions from South Korea.

Click on the links below to download the articles…

A double-walled triangular metal-organic macrocycle based on a [Cu₂(COO)₄] square paddle-wheel secondary building unit
Xiaokai Song, Xinfang Liu, Minhak Oh and Myoung Soo Lah
Dalton. Trans., 2010, 39, 6178–6180

Preparation and characterisation of divalent hard and soft metal (M = Ca, Co, Cu, Zn, Cd, Hg and Pb) complexes of 1,10-dithia-18-crown-6: structural versatility
In-Hyeok Park, Ki-Min Park and Shim Sung Lee
Dalton Trans., 2010, 39, 9696–9704

Self-assembled molecular squares containing metal-based donor: synthesis and application in the sensing of nitro-aromatics
Vaishali Vajpayee, Hyunuk Kim, Anurag Mishra, Partha Sarathi Mukherjee, Peter J. Stang, Min Hyung Lee, Hwan Kyu Kim and Ki-Whan Chi
Dalton Trans., 2011,40, 3112–3115

Two-dimensional metal–organic frameworks with blue luminescence
Seong Huh, Suhyun Jung, Youngmee Kim, Sung-Jin Kim and Seongsoon Park
Dalton Trans., 2010, 39, 1261–1265

Canted antiferromagnetism and spin reorientation transition in layered inorganic–organic perovskite (C₆H₅CH₂CH₂NH₃)₂MnCl₄Seong-Hun Park, In-Hwan Oh, Sungil Park, Younbong Park, Ji Hyun Kim and Young-Duk Huh
Dalton Trans., 2012, 41, 1237–1242

Self-assembled metalla-bowls for selective sensing of multi-carboxylate anions
Anurag Mishra, Vaishali Vajpayee, Hyunuk Kim, Min Hyung Lee, Hyunji Jung, Ming Wang, Peter J. Stang and Ki-Whan Chi
Dalton Trans., 2012, 41, 1195–1201

Anion variation on a cobalt(III) complex of salen-type ligand tethered by four quaternary ammonium salts for CO₂/epoxide copolymerization
Jina Yoo, Sung Jae Na, Hyeong Cheol Park, Anish Cyriac and Bun Yeoul Lee
Dalton Trans., 2010, 39, 2622–2630

Why not check out last year’s New Talent: Asia themed issue for more articles from Korea and beyond?

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Dalton Transactions impact factor increases to 3.84!

03 Jul 2012

The 2011 Journal Citation Reports ® (Thomson Reuters, 2012) have been released and the Dalton Transactions impact factor* has increased to 3.84!

We would like to thank all our authors, readers and referees who have contributed towards this success. Our thanks also go to our Editorial and Advisory Board Members and our Associate Editors for all their hard work and dedication to the journal.

A full list of RSC successes can be found at the RSC Impact Factor release.

For more information about Dalton Transactions, including how to submit your research, check out the journal homepage.

*The IF provides an indication of the average number of citations per paper. Produced annually, IFs are calculated by dividing the number of citations in a year, by the number of citeable articles published in the preceding two years.

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Photochemical carbon dioxide reduction

29 Jun 2012

Photochemical reduction of greenhouse gas, carbon dioxide into higher energy content fuels is attractive because it utilises a renewable energy source – the sun. Most catalysts that are already used for this process (TiO₂and metallic clusters based on Cu, Pt and Rh) need ultraviolet light for excitation and have a low conversion efficiency, prohibiting wide scale industrial application.

There is need for a photocatalyst that is efficient, low cost and can be excited by visible light.

Zhi-Gang Zou and his team at Nanjing University have synthesised an air stable copper (I) bipyridine complex which binds to TiO₂. The Cu(I)complex/TiO₂ hybrid system when irradiated with visible light can reduce CO₂to CH₄ with high efficiency and selectivity.

This is an exciting development — no other products were formed during photoreduction of carbon dioxide and copper is an inexpensive and abundant metal. The possiblilty for using copper complexes in carbon dioxide reduction catalysis has now been opened up for further work…

To find out more (including how Zou and team also used the complex in a dye-sensitised solar cell), read the full Dalton Transactions article:

A Copper(I) Dye-Sensitized TiO₂-Based System for Efficient Light Harvesting and Photoconversion of CO₂ into Hydrocarbon Fuel
Yong-Jun Yuan, Z.T. Yu, Jiyuan Zhang and Zhigang Zou

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Fast Synthesis of C-dots

18 Jun 2012

Quantum dots are nanoparticles of semiconductor material which, because of their very small size, display different optical and electrical properties to that of the corresponding material in the bulk phase. Traditional semiconductor quantum dots are used in optical applications such as cell imaging, LEDs and photodetectors due to their high extinction coefficient.

Due to their cheaper cost and intrinsic low toxicity, carbon nanodots (C-dots) have the potential to replace traditional semiconductor quantum dots. To overcome some of the drawbacks with previous methods of fabricating C-dots, Zhenui Kang and his team at Soochow University, China have developed a facile one step electrochemical synthesis. This exciting new method produces c-dots of high purity and uses only pure water as an electrolyte, which is attractive because it is low cost and more environmentally friendly .

The team also synthesized nanohybrid TiO₂/C-dots which possess good photocatalytic activity.

To find out more about the photoluminescence and photocatalytic properties of C-dots, read the full Dalton Transactions article…

Large Scale Electrochemical Synthesis of High Quality Carbon Nanodots and Their Photocatalytic Property
Zhenhui Kang, Hai Ming, Zheng Ma, Yang Liu, Keming Pan, Hang Yu and Fang Wang

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Articles from around the world: USA

04 May 2012

Inorganic chemistry USA Dalton free articles

Dalton Transactions publishes articles from around the globe

Dalton Transactions has been publishing research in inorganic chemistry for over 40 years, from over 85 countries. To highlight some of the contributions from across the globe we will be selecting a different geographic region each month, collecting some high impact papers and making them free to access! This month, the USA……

Rapid catalytic water oxidation by a single site, Ru carbene catalyst
Zuofeng Chen, Javier J. Concepcion and Thomas J. Meyer
Dalton Trans., 2011,40, 3789-3792

Hydro-ionothermal syntheses, crystal structures, and properties of five new divalent metal iminophosphonates
Kevin J. Gagnon, Andrey V. Prosvirin, Kim R. Dunbar, Simon J. Teat and Abraham Clearfield
Dalton Trans., 2012,41, 3995-4006

Non-traditional platinum compounds for improved accumulation, oral bioavailability, and tumor targeting
Katherine S. Lovejoy and Stephen J. Lippard
Dalton Trans., 2009, 10651-10659

Synthesis and reactivity of cationic niobium and tantalum methyl complexes supported by imido and β-diketiminato ligands
Neil C. Tomson, John Arnold and Robert G. Bergman
Dalton Trans., 2011,40, 7718-7729

Isocyanide insertion and cyclization reactions to form indolines using pincer-type complexes of scandium
Benjamin F. Wicker, Maren Pink and Daniel J. Mindiola
Dalton Trans., 2011,40, 9020-9025

O2 Reduction to H₂O by the multicopper oxidases Inorganic chemistry USA Dalton free articles
Edward I. Solomon, Anthony J. Augustine and Jungjoo Yoon
Dalton Trans., 2008, 3921-3932

You can check out our homepage for the latest articles and if you follow us on twitter or sign up to our e-alert service you can keep up to date with the latest news in inorganic chemistry, hassle free.

Interested in finding out more about the RSC? Join the RSC University Roadshow 2012, which is currently touring the USA, giving you the opportunity to meet some of the RSC Editors, Associate Editors, Board members and get demonstrations on our interactive services such as ChemSpider!

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Dalton Transactions Blog

Archive for the ‘News’ Category

Top ten most accessed articles in June

Hydrazine based hydrogen storage materials

Articles from around the world: Korea

Dalton Transactions impact factor increases to 3.84!

Photochemical carbon dioxide reduction

Top ten most accessed articles in May

Fast Synthesis of C-dots

Top ten most accessed articles in April

Articles from around the world: USA

Top ten most accessed articles in March

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