Relationships between the carbon-oxygen stretching frequencies of carboxylato complexes and the type of carboxylate coordination

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Metal–Organic Frameworks and Self-Assembled Supramolecular Coordination Complexes: Comparing and Contrasting the Design, Synthesis, and Functionality of Metal–Organic Materials

One of the most exciting developments in the areas of catalysis, organometallic chemistry, and polymer science in recent years has been the intense exploration and commercialization of new polymerization technologies based on single-site and metallocene coordination olefin polymerization catalysts.1 The vast number of specifically designed/synthesized transition metal complexes (catalyst precursors) and main-group organometallic compounds (cocatalysts) allows unprecedented control over polymer microstructure, the generation of new polymer architectures, and the development of new polymerization reactions. Commercialization of new generations of single-site and metallocene catalyst-based technologies has provided the multibillion pound per year polyolefins industry with the ability to deliver a wide range of new and innovative olefin-based polymers having improved properties.2-4 The intense industrial activity in the field and the challenges to our basic understanding that have come to light have in turn 1391 Chem. Rev. 2000, 100, 1391−1434

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Cocatalysts for Metal-Catalyzed Olefin Polymerization: Activators, Activation Processes, and Structure−Activity Relationships

Recent Advances in the Baylis−Hillman Reaction and Applications

Selectivity in propene polymerization with metallocene catalysts.

The reaction of calcium granules with Ph 3 SiOH in an ammoniacal-toluene solution at 40 o C produces the complex [Ca 2 (OSiPh 3 ) 4 (NH 3 ) 4 ].0.5C 7 H 8 (1), and reaction of compound 1 with thf at room temperature yields [Ca(OSiPh 3 ) 2 -(thf)] n (2). These two compounds were characterized by IR and 1 H, 13 C, and 29 Si NMR spectroscopy, DSC, and TGA, and the structure of complex 1 was determined by single-crystal X-ray crystallography. The molecule consist of a dimeric calcium motif with one terminal and three μ 2 -bridging triphenylsiloxide ligands

A dimeric calcium siloxide lightly stabilized by ammonia ligands

Synthesis of Base-Free Cationic Zirconium Methyl and Benzyl Complexes. The Crystal and Molecular Structure of {C5H3(SiMe3)2-1,3}2ZrMe(.mu.-Me)B(C6F5)3

The crystal structure and magnetic properties of the molecular-based ferrimagnet N(n-C5H11)4MnIIFeIII(C2O4)3 have been determined. The compound is orthorhombic, space group C2221, a= 9.707(3), b= 16.140(3), c= 19.883(7)A(120 K), Z= 4[R 0.047 for I > 2σ(I)]. The structure consists of hexagonal layers of alternating MnII and FeIII bridged by C2O42–, separated by layers containing only N(n-C5H11)4+ with the alkyl chains extended, though with the terminal bonds twisted towards the gauche conformation. The terminal CH3 are embedded in the hexagonal pockets formed by three C2O42–. Since both metal ions have 3d5 configuration with 6A1 ground states the magnetic properties in the paramagnetic region mimic those of a two-dimensional antiferromagnet. Below TN= 27 K an uncompensated moment estimated as 8.78 × 10–5µB atom–1 arises, the direction of which was identified as parallel to the c axis by single-crystal magnetization measurements.

K. M. Abdul Malik

Papers

A dimeric calcium siloxide lightly stabilized by ammonia ligands

Synthesis of Base-Free Cationic Zirconium Methyl and Benzyl Complexes. The Crystal and Molecular Structure of {C5H3(SiMe3)2-1,3}2ZrMe(.mu.-Me)B(C6F5)3

Crystal structure and magnetic properties of the layer ferrimagnet N(n-C5H11)4MnIIFeIII(C2O4)3

Effect of Polyether Ligands on Stabilities and Mass Transport Properties of a Series of Gadolinium(III) .beta.-Diketonate Complexes

Novel electrochemical sensors for neutral molecules