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Mono- and di-nuclear complexes of the ligands 3,4-di(2-pyridyl)-1,2,5-oxadiazole and 3,4-di(2-pyridyl)-1,2,5-thiadiazole; new bridges allowing unusually strong metal-metal interactions

Journal Article


Abstract


  • The syntheses of two new ligands, 3,4-di(2-pyridyl)-1,2,5-oxadiazole (dpo) and 3,4-di(2-pyridyl)-1,2,5-thiadiazole (dpt), are described. Complexes with palladium and copper have seven-membered chelate rings with coordination through the two pyridine nitrogens, whereas in the silver nitrate complex of dpt the ligand acts as a bridge between metal centres. Studies of the mononuclear ruthenium complexes indicate five-membered chelate rings (involving donor nitrogen atoms from each of a pyridine ring and the oxadiazole or thiadiazole ring) and reveal that these ligands are very electron deficient and possess very low energy π* orbitals. Dinuclear ruthenium complexes have been prepared and the diastereoisomers separated and crystallographically characterised. Electrochemical studies of these complexes reveal remarkably strong metal-metal interactions, which also depend on the stereoisomeric form. Some heterodinuclear complexes have also been prepared.

Publication Date


  • 2002

Citation


  • Richardson, C., Steel, P. J., D'Alessandro, D. M., Junk, P. C., & Keene, F. R. (2002). Mono- and di-nuclear complexes of the ligands 3,4-di(2-pyridyl)-1,2,5-oxadiazole and 3,4-di(2-pyridyl)-1,2,5-thiadiazole; new bridges allowing unusually strong metal-metal interactions. Journal of the Chemical Society, Dalton Transactions, (13), 2775-2785. doi:10.1039/b202954e

Scopus Eid


  • 2-s2.0-0036019792

Start Page


  • 2775

End Page


  • 2785

Issue


  • 13

Abstract


  • The syntheses of two new ligands, 3,4-di(2-pyridyl)-1,2,5-oxadiazole (dpo) and 3,4-di(2-pyridyl)-1,2,5-thiadiazole (dpt), are described. Complexes with palladium and copper have seven-membered chelate rings with coordination through the two pyridine nitrogens, whereas in the silver nitrate complex of dpt the ligand acts as a bridge between metal centres. Studies of the mononuclear ruthenium complexes indicate five-membered chelate rings (involving donor nitrogen atoms from each of a pyridine ring and the oxadiazole or thiadiazole ring) and reveal that these ligands are very electron deficient and possess very low energy π* orbitals. Dinuclear ruthenium complexes have been prepared and the diastereoisomers separated and crystallographically characterised. Electrochemical studies of these complexes reveal remarkably strong metal-metal interactions, which also depend on the stereoisomeric form. Some heterodinuclear complexes have also been prepared.

Publication Date


  • 2002

Citation


  • Richardson, C., Steel, P. J., D'Alessandro, D. M., Junk, P. C., & Keene, F. R. (2002). Mono- and di-nuclear complexes of the ligands 3,4-di(2-pyridyl)-1,2,5-oxadiazole and 3,4-di(2-pyridyl)-1,2,5-thiadiazole; new bridges allowing unusually strong metal-metal interactions. Journal of the Chemical Society, Dalton Transactions, (13), 2775-2785. doi:10.1039/b202954e

Scopus Eid


  • 2-s2.0-0036019792

Start Page


  • 2775

End Page


  • 2785

Issue


  • 13