title: New Group 6 metal carbonyl derivatives of 2-(2'(-pyridyl)benzimidazole: synthesis and spectroscopic studies.
abstract: Reaction of Cr(CO)(6) with 2-(2'-pyridyl)benzimidazole (pbiH) under reduced pressure resulted in the formation of the dinuclear complex [Cr(2)(CO)(6)(pbiH)(2)]. Infra-red (IR) spectroscopy revealed the presence of terminal and bridge Cr-CO bonds. Interaction of M(CO)(6), M=Cr, Mo and W, with pbiH in the presence of 2,2'-bipyridine (bpy) gave the tetracarbonyl complexes [M(CO)(4)(pbiH)].bpy. Spectroscopic studies of the complexes indicated the presence of hydrogen bonding between the bpy nitrogen and the NH group of pbiH. Reactions of M(CO)(6) with pbiH in the presence of PPh(3) gave the tricarbonyl monosubstituted derivatives [M(CO)(3)(PPh(3))(pbiH)]. The spectroscopic studies of the complexes suggested the proposed structures.
authors.affiliation: Chemistry Department, Faculty of Science, Ain Shams University, Cairo, Egypt.
authors.forename: Mostafa M H
authors.initials: MM
authors.lastname: Khalil
authors.forename: Hassan A
authors.initials: HA
authors.lastname: Mohamed
authors.forename: Samir M
authors.initials: SM
authors.lastname: El-Medani
authors.forename: Ramadan M
authors.initials: RM
authors.lastname: Ramadan
mesh_terms: D001562:Benzimidazoles / Q000138:chemical synthesis / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D009584:Nitrogen / Q000737:chemistry; D011522:Protons; D013053:Spectrophotometry / Q000379:methods*; D013055:Spectrophotometry, Infrared; D014466:Ultraviolet Rays
chemical_list: C479869:2-(2'-pyridyl)benzimidazole; D001562:Benzimidazoles; D011522:Protons; D002244:Carbon; D009584:Nitrogen