Molybdenum carbonyl complexes with pyridylimino acidato ligands.
Reactions of [Mo(CO)(4)(pip)(2)] with pyridine-2-carbaldehyde and the appropriate amino ester or amino acid produce complexes with chelated pyridylimino ligands bearing, respectively, an ester () or carboxylate (, , ) pendant arm, the structures of which have been determined by X-ray crystallography. In the case of alpha-amino acids, the resulting imino carboxylate complexes are unstable towards decarboxylation, this being complete for (R)-2-phenylglycine. The products of decarboxylation were isolated and characterized, including X-ray structure determinations for and . In contrast, the derivatives of beta-alanine () and 3- and 4-aminobenzoic acids () are stable towards decarboxylation. The structure determinations show that the pyridyliminocarboxylate complexes crystallize as salts with piperidinium cations, forming hydrogen-bonded ion-pair dimers featuring twelve- or eight-membered rings. Protonation of carboxylate complexes with 2 M HCl in CH(2)Cl(2)/water yields the corresponding neutral complexes containing a free carboxylic acid functionality.[1]References
- Molybdenum carbonyl complexes with pyridylimino acidato ligands. García-Rodríguez, R., Miguel, D. Dalton transactions (Cambridge, England : 2003) (2006) [Pubmed]
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