Dalton Transactions Blog

In this Dalton Transactions Hot Article, Sathiyendiran Malaichamy and colleagues prepared stable, luminescent rhenium-based metallacycles decorated with furan units.

The 2D rectangle with four furans and the 3D trigonal prism with six furans were synthesised from readily available starting materials in a one-pot procedure.

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Furan-decorated neutral Re(I)-based 2D rectangle and 3D trigonal prism
Deepak Gupta, Palanisamy Rajakannu, Bhaskaran Shankar, Ramasamy Shanmugam, Firasat Hussain, Biprajit Sarkar and Malaichamy Sathiyendiran
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C0DT01227K, Communication

In this Dalton Transactions Hot article, Herbert W. Roesky and Dietmar Stalke and collegues from
Universitat Gottingen, Germany, make a stable silicon(II) monohydride and examine its electronic structure.

Group 14 hydrides are used in synthetic chemistry, and as precursors to make alloys, such as amorphous silicon, that are used in  electronic devices. For this reason the ability to make stable compounds is very desirable, and an understanding of their structure will help develop the field of silicon chemistry.

Read the full article to discover more about this silicon(II) monohydride…

A stable silicon(II) monohydride
Anukul Jana, Dirk Leusser, Ina Objartel, Herbert W. Roesky and Dietmar Stalke
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C0DT01675F, Paper

FREE TO READ until 6th May

In this Dalton Transactions Hot article by William T. Eckenhoff and Tomislav Pintauer, Duquesne University, Pittsburgh, USA, copper(II) complexes with the Me₆TREN ligand and AIBN were used as atom transfer radical addition catalysts.

Atom transfer radical addition is a way of making carbon-carbon bonds using a transition metal catalyst. This method can require a large ratio of catalyst to get a good yield, and can be difficult to recycle, so new ways to optimise this system are crucial.

Here the authors use a free radical diazo initiator (AIBN) to regenerate the catalyst in situ, and use the Me₆TREN ligand to reduce the amount of copper in a higher oxidation state, which would otherwise deactivate the catalyst. This makes for a much more efficient reaction, and here this system was used to catalyze the addition of CCl₄, CHCl₃, CBr₄, and CHBr₃ to a series of alkenes.

Read the full article to find out more about this method for controlled radical addition…

Atom transfer radical addition (ATRA) catalyzed by copper complexes with tris[2-(dimethylamino)ethyl]amine (Me6TREN) ligand in the presence of free-radical diazo initiator AIBN
William T. Eckenhoff and Tomislav Pintauer
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C1DT10189G, Paper

FREE TO READ until 21st April

John Stride from the University of New South Wales, Sydney and colleagues have prepared a copper-based metal–organic framework that demonstrates gas selective adsorption of hydrogen over nitrogen.

The microporous framework has potential application in the isolation of hydrogen from nitrogen in ammonia sythesis waste streams.

Read more in this Dalton Transactions Hot article available FREE until 11th April 2011:

A flexible copper based microporous metal–organic framework displaying selective adsorption of hydrogen over nitrogen
Muhammad Arif Nadeem, Aaron W. Thornton, Matthew R. Hill and John Arron Stride
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C0DT01531H, Hot Article

In this Dalton Transactions Hot Article, chemists from Australia and the US have studied the solution behaviour of two novel platinum-based antitumour complexes.

The dinuclear, polyamine-linked complexes show significant cytotoxicity and antitumour activity compared to other polynuclear platinum complexes.

The rate constants for hydrolysis of the two complexes and the acid dissociation constants of the aquated aqua ligands of their aquated derivatives are reported. The values are of interest because the aquated species are more reactive than their hydroxo counterparts in the context of DNA binding.

Read more for FREE until 12th April 2011:
Solution studies of dinuclear polyamine-linked platinum-based antitumour complexes
Rasha A. Ruhayel, Ibrahim Zgani, Susan J. Berners-Price and Nicholas P. Farrell
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C1DT00001B, Paper

In this Dalton Transactions Hot article, two new Co^_II/Ln^III complexes are synthesized with 2-amino-isobutyric acid.

The complexes are hetero-heptametallic clusters ( [Co^II₆Ln^III] )with 2-amino-isobutyric acid as the ligand, forming 3d-4f metallic cages in which the Ln^III centre (Ln = Eu, Dy) is encapsulated within a Co^II₆ trigonal prism.

Constantinos J. Milios and co-workers from the University of Crete looked at the optical and magnetic properties of their complexes, and found that one (containing Dysprosium) has the potential to be a single molecule magnet, while the other (containing Europium) exhibited luminescent properties.

Read the full article to find out more about these 3d-4f metallic cages…

Unique trigonal prism encapsulated Ln complexes: a [CoII6Eu] and a [CoII6Dy] cage
Maria Orfanoudaki, Ioannis Tamiolakis, Milosz Siczek, Tadeusz Lis, Gerasimos S. Armatas, Spiros A. Pergantis and Constantinos J. Milios
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C1DT10052A, Communication

FREE TO READ until 12th April

In this new Dalton Transactions Hot Article, Macgregor, Welch, Zanello et al. report the synthesis of carboranes substituted with a range of ArF substituents.  The team also describe the results of spectroscopic, computational and (spectro)electrochemical studies for identifying the best ArF substituent to stabilise the new carboranes once reduced.

Supraicosahedral heteroborane chemistry is an area of contemporary interest. Heteroborane clusters with >12 vertices can be challenging to synthesise and can present interesting problems for computational chemists.

Supraicosahedral heteroborane chemistry is important as  such compounds could find valuable applications in a wide range of fields  from bond activation and homogeneous catalysis to medicine.

Read for free until the 1st April 2011 here.

Spectroscopic, structural, computational and (spectro)electrochemical studies of icosahedral carboranes bearing fluorinated aryl groups
Hugo Tricas, Marta Colon, David Ellis, Stuart A. Macgregor, David McKay, Georgina M. Rosair, Alan J. Welch, Ivan V. Glukhov, Fulvio Rossi, Franco Laschi and Piero Zanello
Dalton Trans., 2011, Advance Article, DOI: 10.1039/C0DT01798A

In this paper, indium(III), antimony(III) and bismuth(III) dihalide complexes with deprotonated, tridentate thio- and selenosemicarbazone ligands have been fully investigated.

An understanding of the chemistry of the thiosemicarbazonato ligand, which is known for its anti tumour and pharmacological properties, is of high importance, and is of special interest to scientists in the field of organoselenium research.

Read the full manuscript to find out more about Mohr and colleagues latest research on the coordination chemistry of organoselenium compounds. As this work has been selected as a Dalton Transactions Hot article, it will be FREE to access until 5th April.

Indium(III), antimony(III) and bismuth(III) dihalide complexes with tridentate, anionic thio- and selenosemicarbazonato ligands
Anja Molter and Fabian Mohr
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C0DT01693D, Paper

This Perspective article by Shuang Liu, an expert in radiopharmaceuticals, looks at different synthesis methods and applications of  ^99mTc radiotracers.

Liu, based at the School of Health Sciences, Purdue University, USA, brings together both the latest research and the fundamental chemistry of Technetium-99 m. This offers an invaluable insight into nuclear medicine and using techniques such as single photon emission computed tomography (SPECT) and positron emission tomography (PET).

Download the full review today.

99m Tc-centered one-pot synthesis for preparation of 99mTc radiotracers
Shuang Liu and Sudipta Chakraborty
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C0DT01462A, Perspective