A single crystal structure of an aluminium-fluoride complex of a model compound (NODA-benzyl) was studied to understand the co-ordination chemistry. Series of ligands with an extra carboxylic acid linker for biomolecule conjugation were studied for improved (18)F-labeling applications.
Cycloaddition of alkynes with alkenes and carbon monoxide by dicobalt octacarbonyl to cyclopentenones (known as Pauson-Khand reaction) has been recognized as one of the most important methodologies to synthesize cyclopentenone derivatives. 1 Recently the catalytic version of the Pauson-Khand reaction has been developed by us and others. 2 In developing large-scale processes, it is extremely important to heterogenize homogeneous catalyst systems, because heterogeneous catalytic systems have many advantages over homogeneous counterparts in liquid-phase reactions, including easy removal of catalysts from reaction mixtures and recycling/reuse of catalysts. 3 In heterogenizing homogeneous catalyst systems, supports such as polymers, silica, and zeolites have received the most attention. 4 Recently, various mesoporous silicas with pore size ranging from 2 to 10 nm have been extensively applied as supports for many catalytically active metals and homogeneous catalysts. 5 Here we report the first heterogeneous catalyst system for Pauson-Khand reactions. The catalyst system is metallic cobalt supported on mesoporous silica.
Novel complexes 1 and 2 based on N-heterocyclic carbenes, which are analogous to Ru(bpy)(3)(2+) and Ru(terpy)(2)(2+), respectively, were synthesized. The complex, which is analogous to Ru(terpy)(2)(2+), exhibited promising photoluminescence properties with a long lifetime of 820 ns in acetonitrile and 3100 ns in water at room temperature, respectively. In addition, ab initio calculations were carried out.
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