Dalton Transactions Blog

In this HOT Article, the serendipitous self-assembly of the complex [Mn^III₂Zn^II₂(Ph-sao)₂(Ph-saoH)₄(hmp)₂], whose magnetic core consists solely of two symmetry equivalent Mn(III) ions linked by two symmetry equivalent –N–O– moieties, provided Brechin and co-workers with a relatively simple model complex with which to study the magneto-structural relationships in more complicated polynuclear oxime-bridged Mn(III) cluster compounds.

Read more for FREE until 21st September at:

In this HOT article, Díaz-Torres and Alvarez have developed a scale which attempts to quantify the weakly coordinating character of a variety of solvents and anions towards a transition metal or a lanthanide.  This was made possible by analyzing crystal structures for the presence of coordinated and uncoordinated groups (solvents or anions) in the presence of a transition metal or a lanthanide and extracting from this coordinating ability indices. These indices should prove very useful in providing general trends  allowing comparison between different solvents or anions and should be very useful for the broad organometallic community.

Read more for FREE until 11th October about this elegant solution:

Coordinating ability of anions and solvents towards transition metals and lanthanides
Raúl Díaz-Torres and Santiago Alvarez
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C1DT11000D

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

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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.

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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 [MLi₇(μ₈-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

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

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