Dalton Transactions Blog

In this HOT article, Constantinos J. Milios and co-workers describe the synthesis, crystal structures and magnetic properties of (a hexanuclear and an octanuclear) manganese(III) complexes based on a new oxime ligand, 2-dihydroxy-2-phenylacetamidine.  This is the first time that this ligand has been  used for the synthesis of polynuclear complexes of any transition metal ion. Even though the hexanuclear complex resembles the previously reported [Mn₆] clusters with salicyl-based oximes, the octanuclear complex presents a new structural type in Mn chemistry. Both complexes display moderate spin ground states (S = 3). The authors believe this new ligand is a promising candidate for a new extended family of manganese complexes with interesting magnetic properties and as impressive structures as its parent salicyl- or pyridyl-based oxime ligands.

Read more about this new ligand and potential magnetic properties for FREE until 25 th October at:

A new oxime ligand in manganese chemistry: a [Mn₈] and a [Mn₆] cage from the use of 2-dihydroxy-2-phenylacetamidine
Andreas G. Flamourakis, Demetrios Tzimopoulos, Milosz Siczek, Tadeusz Lis, James R. O’Brien, Pericles D. Akrivos and Constantinos J. Milios
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C1DT11455G

Peter Sadler from Warwick University, and collaborators at the Chinese Academy of Sciences have developed a ruthenium arene anticancer complex that inhibits the action of protein tyrosine phosphatase 1B, which regulates insulin levels.

In this Dalton Transactions Hot article the team investigate how the complex interacts with the active site of PTP1B by using a similiar shaped molecule as a model. Their compound was found to have an IC₅₀ of 19 μM.

Read the full article for FREE until 2nd November to find out more about how this anticancer compound works…

Reactions of an organoruthenium anticancer complex with 2-mercaptobenzanilide—a model for the active-site cysteine of protein tyrosine phosphatase 1B
Yumiao Han, Qun Luo, Xiang Hao, Xianchan Li, Fuyi Wang, Wenbing Hu, Kui Wu, Shuang Lü and Peter J. Sadler
Dalton Trans., 2011, DOI: 10.1039/C1DT11189B

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A team of scientists from Poland have been playing around with silver-pyrazine complexes and made an unusual crystal structure of a Ag(I) by–product in the process. Piotr J. Leszczyński, Wojciech Grochala and colleagues from Warsaw studied the decomposition of di(pyrazine)silver(II) peroxydisulfate under various heat and chemical processes.

Much work has been carried out on the copper analogue before this but only now is the silver version really being looked at. Read more in this recent Hot Article – FREE to read until the end of October:

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Thermal and chemical decomposition of di(pyrazine)silver(II) peroxydisulfate and unusual crystal structure of a Ag(I) by-product
Piotr J. Leszczyński, Armand Budzianowski, Łukasz Dobrzycki, Michał K. Cyrański, Mariana Derzsi and Wojciech Grochala
Dalton Trans., 2011, DOI: 10.1039/C1DT10744E

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