title: Mono and dinuclear arene ruthenium(II) triazoles by 1,3-dipolar cycloadditions to a coordinated azide in ruthenium(II) compounds.
abstract: The dimeric η(6)-hexamethylbenzene ruthenium(II) triazole compounds of formulation [{(η(6)-C(6)Me(6))Ru(N(3)C(2)(CO(2)R)(2))}(2)(μC(2)O(4))] have been synthesized by 1,3-diploar cycloadditions of coordinated azido compound [{(η(6)-C(6)Me(6))Ru(L(1))N(3)}] (1) with substituted acetylene, RO(2)CC(2)CO(2)R via unexpected oxidation of the coordinated ligand to oxalate (where; L(1) = 5-hydroxy-2-(hydroxymethyl)-4-pyrone; R = Me, 3 or Et, 4). In contrast, a similar 1,3-dipolar cycloaddition reaction of [{(η(6)-C(6)Me(6))Ru(L(2))N(3)}] (2) (where; L(2) = tropolone) with acetylene yielded the monomeric triazole compound [(η(6)-C(6)Me(6))Ru(L(2)){N(3)C(2)(CO(2)R)(2)}] (where; R = Me, 5; Et, 6). The compounds were characterized by spectroscopy and the structures of representative compounds 4 and 6 have been determined by single crystal X-ray diffraction. The two ruthenium centres in the compound 4, are linked by a tetra-dentate oxalate group. Both compounds, 4 and 6, crystallized in a triclinic space group P-1.
authors.affiliation: Bioorganic Chemistry Laboratory, National Institute of Oceanography (CSIR), Goa, 403004, India. keisham@nio.org
authors.forename: Keisham Sarjit
authors.initials: KS
authors.lastname: Singh
authors.forename: Volodymyr
authors.initials: V
authors.lastname: Svitlyk
authors.forename: Yurij
authors.initials: Y
authors.lastname: Mozharivskyj
mesh_terms: D018360:Crystallography, X-Ray; D003500:Cyclization; D008958:Models, Molecular; D017975:Ruthenium Compounds / Q000737:chemistry*; D014230:Triazoles / Q000737:chemistry*
chemical_list: D017975:Ruthenium Compounds; D014230:Triazoles