J. Appl. Cryst.の発刊に際して

Since the first reports in the late 1970s on transition metal complexes contain- ing pincer-type ligands—named after the particular coordination mode of these ligands—these systems have at- tracted increasing interest owing to the unusual properties of the metal centers imparted by the pincer ligand. Typical- ly, such a ligand comprises an anionic aryl ring which is ortho,ortho-disubsti- tuted with heteroatom substituents, for example, CH2NR2 ,C H 2PR2 or CH2SR, which generally coordinate to the met- al center, and therefore support the MC s bond. This commonly results in a terdentate and meridional coordina- tion mode consisting of two metalla- cycles which share the MC bond. Detailed studies of the formation and the properties of a large variety of pincers containing platinum group metal complexes have provided direct access to both a fundamental under- standing of a variety of reactions in organometallic chemistry and to a range of new applications of these complexes. The discovery of alkane dehydrogenation catalysts, the mecha- nistic elucidation of fundamental transformations (for example, CC bond activation), the construction of the first metallodendrimers for sustain- able homogeneous catalysis, and the engineering of crystalline switches for materials processing represent only a few of the many highlights which have emanated from these numerous inves- tigations. This review discusses the synthetic methodologies that are cur- rently available for the preparation of platinum group metal complexes con- taining pincer ligands and especially emphasizes different applications that have been realized in materials science such as the development and engineer- ing of sensors, switches, and catalysts.

Platinum Group Organometallics Based on “Pincer” Complexes: Sensors, Switches, and Catalysts

The Golden Age of Transfer Hydrogenation

Reactivity of Dioxygen−Copper Systems

2. Thiol Oxidation to Disulfides 3007 3. Epoxidation of Alkenes 3007 4. Oxidation of Bromide 3008 5. Oxidation of Mercaptoethanol by Dioxygen 3008 V. Particle−Dendrimer Assemblies 3008 1. Hydrogenation 3008 2. Heck Reaction 3010 3. Anodic Oxidation of Ethanol 3010 VI. Redox Catalysis 3010 1. Anodic Oxygen Reduction 3010 2. Cathodic Reduction of CO2 to CO 3010 3. Ferrocenes as Redox Mediators for Glucose Oxidation 3010

Dendritic Catalysts and Dendrimers in Catalysis

Bimetallic η6,η1 NCN-pincer ruthenium palladium complexes with η6-RuCp coordination: synthesis, X-ray structures, and catalytic properties

Synthesis of Polyaryl Rigid-Core Carbosilane Dendrimers for Supported Organic Synthesis

http://dspace.library.uu.nl/bitstream/handle/1874/19928/title.pdf

Pincer-porphyrin hybrids.

Three novel bis{(2-pyridyl)ethyl}amine (PY2) containing ligands and their corresponding Cu(I) complexes have been synthesized. The effect of varying Cu−Cu distances in these complexes on their abil...

Synthesis, Structure, and Reactivity of Copper Dioxygen Complexes Derived from Molecular Receptor Ligands

In 1976, Shaw and Moulton reported on a pincer–nickel compound with the nickel atom held in place by a monoanionic, terdentate PCP ligand.1 At that time these authors could not have imagined that 35 years later a Dalton Transactions themed issue would be devoted to papers describing novel developments in organometallic chemistry featuring the pincer platform as a crucial factor determining reactivity and selectivity of the pincer complexes involved. The Guest Editors of this issue feel honoured to have been invited to organize this themed issue on Pincer Metal Chemistry and are grateful that somany authors, by submitting their newest achievements, accepted the opportunity to showcase their fascination for using this “privileged” ligand platform (see Fig. 1) and share their views concerning the current status of the field and its rapid development.

R.J.M. Klein Gebbink

Papers

Bimetallic η6,η1 NCN-pincer ruthenium palladium complexes with η6-RuCp coordination: synthesis, X-ray structures, and catalytic properties

Synthesis of Polyaryl Rigid-Core Carbosilane Dendrimers for Supported Organic Synthesis

Pincer-porphyrin hybrids.

Synthesis, Structure, and Reactivity of Copper Dioxygen Complexes Derived from Molecular Receptor Ligands

The monoanionic pincer-metal platform: a scaffold for meeting challenges in catalysis and materials research.