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Bis(imidate)palladium(II) complexes with labile ligands. Mimics of classical precursors?
Gregorio Sánchez, Joaquín García, Marina Martínez, Anant R. Kapdi, José Pérez, Luis García and J. Luis Serrano
Dalton Trans., 2011, 40, 12676-12689
DOI: 10.1039/C1DT10426H
The inside front cover highlights research from Huang et al.
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A new photocatalyst: Bi2TiO4F2 nanoflakes synthesized by a hydrothermal method
Shaoying Wang, Baibiao Huang, Zeyan Wang, Yuanyuan Liu, Wei Wei, Xiaoyan Qin, Xiaoyang Zhang and Ying Dai
Dalton Trans., 2011, 40, 12670-12675
DOI: 10.1039/C1DT10889A
The dual nature of donor ligands is explored in Oxygen Atom Transfer (OAT) in this hot article by Adam Veige and co-workers. In this study, donor ligands enhance the rate of OAT by hindering µ-O dimer formation; however, the addition of a too strongly coordinating ligand can actually prevent OAT by
Transition metal complexes bearing functional P,N-type ligands attract much attention because they combine hard nitrogen donor(s) and soft phosphorus donor(s) and offer considerable chemical and structural diversity. In this HOT Article, Braunstein et al. report several palladium/cobalt and nickel complexes with phosphino-oxazoline ligands. Some of the nickel complexes were further checked for their ethylene reactivity, and showed activity for ethylene non-selective oligomerization. Interestingly, a reversible interconversion transform phenomena was observed between a couple of the isomeric Ni-complexes with variation of the solvent between CH2Cl2 and CHCl3.
Braunstein and co-workers have formed a dinuclear Ir(I) complex with a bis-NHC ligand in situ from
Oelkers and Sundermeyer, in this HOT Article, present a general approach towards 1,4-diazabutadiene (DADS) ligands with various onium cations via acid–base reactions and towards their noble-metal complexes. The solubility and immobilization of such complexes in ILs is quantitatively shown via photometric measurements using a chromophoric Mo(0) DADS complex in a toluene/[BMIM]OTf biphasic mixture as a model system. It was shown that complexes with ionic liquid (IL) – typical onium salts of sulfonated diazadienes as ligands are strongly retained in an IL phase in contact with a toluene phase, which may make these ligands potentially useful in IL/organic biphasic catalysis.
In this HOT Article, US researchers have presented an in depth reactivity study of alkynylgold species and phosphonates. As protodeauration is the main terminating step in gold catalysis, the effect of labile P–H bonds will be of interest to those studying gold catalysis, as well as those studying phosphite chemistry.
This HOT article by Mukherjee et al. reports the synthesis, structure, magnetic properties and DFT studies of four Cu(II)-azide polymers. Cu(II)-azide polymers are presently being studied by many groups due to their interesting structural variation and magnetic properties. In this paper, three out of the four compounds studied are of new structural topologies. All four complexes exhibit an overall ferromagnetic behaviour; the magnetic results are corroborated by DFT studies. The structural analysis shows how a simple change in the structure of the blocking ligand can generate entirely different structures and magnetic properties, even though the basic structures seems to be almost identical. It is also shown that another blocking diamine does not produce similar complexes under the same reaction conditions, which leads to the question: are certain compositions forbidden?
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.
In this HOT Article, the serendipitous self-assembly of the complex [MnIII2ZnII2(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.
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.