Dalton Transactions Blog

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In this Dalton Transactions Hot article, Chebrolu P. Rao from the Indian Institute of Technology, Bombay and colleagues investigate the anticancer activity of the organometallic compound, copper (II) anthracenyl-terpyridine.

This compound is particularly exciting because it kills cells in a way not seen before with copper complexes.

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Synthesis, characterization, plasmid cleavage and cytotoxicity of cancer cells by a copper(II) complex of anthracenyl-terpyridine
Amit Kumar, Jugun Prakash Chinta, Amrendra Kumar Ajay, Manoj Kumar Bhat and Chebrolu P. Rao
Dalton Trans., 2011, DOI: 10.1039/C1DT10201J

In this HOT article, a very careful synthetic and catalytic study of the use of di- and trisulfonated phosphines with o, m and o, m, m substitution patterns is described. Pd complexes of these were tested for  copolymerizations with polar monomers. This led to a novel anionic phosphine sulphonate Pd(II)-based pre-catalyst salt for polymerisation reactions.  Although, polymerisation in the presence of methyl acrylate, acrylonitrile and vinyl acetate led to reduced incorporation values compared to the available literature reports in combination with problems that are attributed to aggregation of the catalyst in most cases, the facile synthesis of chelating highly polar ligands which show high water solubility could be of significant interest for homogeneous catalysis by application in other systems.

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Synthesis of non-symmetrically sulphonated phosphine sulphonate based Pd(II) catalyst salts for olefin polymerisation reactions
Timo M. J. Anselment, Carly E. Anderson, Bernhard Rieger, M. Bele Boeddinghaus and Thomas F. Fässler
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C1DT10372E

In this Dalton Transactions Hot Article, Maria-Angels Carvajal and colleagues probe the photomagnetic properties of a copper octacyanomolybdate complex using high level ab initio calculations.

The authors describe in detail the photomagnetic process arising from a local Mo d-d excitation in the complex. They also show that there is a small energy barrier for the reverse reaction and that it can be induced by light. They also investigate the temperature dependence of the magnetic susceptibility and compare it with experimental values.

Photomagnetic materials are of interest as candidates for use in memory devices and optical switches.

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Insights on the photomagnetism in copper octacyanomolybdates
Maria-Angels Carvajal, Rosa Caballol and Coen de Graaf
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C1DT10120J, Paper

In this Dalton Transactions Hot Article, Graham Bowmaker from the University of Auckland and colleagues, synthesised three new disilver(I) carbonate/tertiary phosphine complexes.

Solution and mechanochemical methods were used. The use of the mechanochemical synthesis demonstrates an additional aspect of this type of method. The study also demonstrates the value of ATR IR and CPMAS NMR for monitoring the progress of mechanochemical synthesis.

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Solution and mechanochemical syntheses, and spectroscopic and structural studies in the silver(I) (bi-)carbonate: triphenylphosphine system
Graham A. Bowmaker, Effendy, John V. Hanna, Peter C. Healy, Scott P. King, Claudio Pettinari, Brian W. Skelton and Allan H. White
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C1DT10416K, Paper

In this HOT article, the authors have extended their work in understanding enantioselective catalysis by coordination compounds. The role of steric hindrance in controlling the binding mode of propylene oxide to a novel vanadyl salen-type complex N,N‘-bis(5-tert-butylsalicylidene)-1,2-cyclohexanediamino-vanadium(IV) oxide, [VO(3)], has been investigated using CW/pulse EPR, ENDOR and HYSCORE spectroscopy and compared to that of the parent complex N,N‘-bis(3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediamino-vanadium(IV) oxide, [VO(1)]. Removal of the ‘inner tert-butyl groups from the salicylidene rings reduces the steric hindrance between the ligand and epoxide substrate. As a result the selectivity for binding single enantiomers of propylene oxide in these complexes is reversed in [VO(3)] relative to [VO(1)].

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Structure and pulsed EPR characterization of N,N‘-bis(5-tert-butylsalicylidene)-1,2-cyclohexanediamino-vanadium(IV) oxide and its adducts with propylene oxide
E. Carter, I. A. Fallis, B. M. Kariuki, I. R. Morgan, D. M. Murphy, T. Tatchell, S. Van Doorslaer and E. Vinck
Dalton Trans., 2011, Advance Article
DOI: 10.1039/C1DT10378D