Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， category: catalyst-ligand, Which mentioned a new discovery about 2926-30-9
A series of complexes has been prepared of the form [Re(dien)(PPh3)(PF3)(L)]+ (dien = diethylenetriamine), where L is an unsaturated organic molecule. The range of ligands which form eta2-coordinate complexes with this metal center includes aldehydes, olefins, and dienes. In addition, thiophene, benzo[b]thiophene, and acetonitrile bind through their heteroatoms. Although {Re(dien)(PPh3)(PF3)}+ (dien = diethylenetriamine) displays chemical and spectroscopic characteristics of a potent pi-base, it fails to form stable eta2-coordinated complexes with aromatic molecules. However, its carbonyl analogue {Re(dien)(PPh3)(CO)}+, when combined with furan, forms the complex [Re(eta2-furan)(dien)(PPh3)(CO)][OTf], a rare example of a thermally stable eta2-heterocycle.
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Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI