Coordination chemistry of a bis(benzimidazole) disulfide: eleven membered chelate ring in cobalt(II), zinc(II) and cadmium(II) halide compounds; oxidative disulfide cleavage when coordinated to nickel(II).
Herein we report the synthesis, structural and spectroscopic characterization of coordination compounds with bis[2-(1H-benzimidazol-2-yl)phenyl]disulfide [bis-(2phSbz)] (1) and cobalt(II), zinc(II) and cadmium(II) halides (2-7). Their X-ray diffraction analyses showed that the metal ions present similar distorted tetrahedral structures, with the disulfide ligand coordinated through the imidazolic nitrogen atoms, forming a twisted eleven membered chelate ring. Structures of nickel(II) compounds 8 and 9, showed that the disulfide bond in the ligand was cleaved forming six membered chelates. In 8, the two ligands are sulfides, however in 9 one of them was oxidized to a sulfone. In both compounds the nickel(II) has a distorted square planar geometry and the sulfur atoms are in cis positions. The oxidation reaction of bis-(2phSbz) was performed in KMnO4/NaOH, giving the 2-(1H,3H-benzimidazolium-2-yl)-benzene sulfonate (10). The solid state structure of compounds 2-5 and 7-10 was determined by X-ray diffraction analyses.
Departamento de Química Inorgánica, Facultad de Química, Universidad Nacional Autónoma de México, C.U., Coyoacán, México, D.F. 04510, México.
Adriana
A
Esparza-Ruiz
Guadalupe
G
González-Gómez
Edgar
E
Mijangos
Adrián
A
Peña-Hueso
Horacio
H
López-Sandoval
Angelina
A
Flores-Parra
Rosalinda
R
Contreras
Norah
N
Barba-Behrens
D001562:Benzimidazoles / Q000737:chemistry*; D002104:Cadmium / Q000737:chemistry; D002614:Chelating Agents / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004220:Disulfides / Q000737:chemistry*; D006219:Halogens / Q000737:chemistry*; D008670:Metals / Q000737:chemistry*; D008968:Molecular Conformation; D009532:Nickel / Q000737:chemistry; D015032:Zinc / Q000737:chemistry
D001562:Benzimidazoles; D002614:Chelating Agents; D056831:Coordination Complexes; D004220:Disulfides; D006219:Halogens; D008670:Metals; D002104:Cadmium; C009712:bis-benzimidazole; D003035:Cobalt; D009532:Nickel; D015032:Zinc