title: Luminescent dirhenium(I)-double-heterostranded helicate and mesocate.
abstract: The semirigid ligands 1,4-bis(2-(2-hydroxyphenyl)benzimidazol-1-ylmethyl)benzene (H2-pBC) and 1,3-bis(2-(2-hydroxyphenyl)benzimidazol-1-ylmethyl)-2,4,6-trimethylbenzene (H2-mBC), containing two hydroxyphenylbenzimidazolyl units as bis-chelating (or bis(bidentate)) N∩OH donor, were synthesized and were used to assemble neutral, luminescent heteroleptic, unsaturated double-hetero-stranded, rhenium(I)-based helicate (1) and mesocate (2) with the flexible bis(monodentate) nitrogen donor (1,4-bis(benzimidazol-1-ylmethyl)benzene/1,3-bis(benzimidazol-1-ylmethyl)benzene), and Re2(CO)10. The photophysical properties of the complexes were studied. Both complexes 1 and 2 exhibit dual emissions in both solution and solid state. In solution, these complexes show both fluorescence and phosphorescence. Complex 1 undergoes a predominantly ligand-centered oxidation, resulting in the generation of phenoxyl radicals.
authors.affiliation: Department of Chemistry, University of Delhi , Delhi 110 007, India.
authors.forename: Bhaskaran
authors.initials: B
authors.lastname: Shankar
authors.forename: Saugata
authors.initials: S
authors.lastname: Sahu
authors.forename: Naina
authors.initials: N
authors.lastname: Deibel
authors.forename: David
authors.initials: D
authors.lastname: Schweinfurth
authors.forename: Biprajit
authors.initials: B
authors.lastname: Sarkar
authors.forename: Palani
authors.initials: P
authors.lastname: Elumalai
authors.forename: Deepak
authors.initials: D
authors.lastname: Gupta
authors.forename: Firasat
authors.initials: F
authors.lastname: Hussain
authors.forename: Govindarajan
authors.initials: G
authors.lastname: Krishnamoorthy
authors.forename: Malaichamy
authors.initials: M
authors.lastname: Sathiyendiran
mesh_terms: D001554:Benzene / Q000737:chemistry; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D004563:Electrochemistry; D008024:Ligands; D049408:Luminescent Agents / Q000138:chemical synthesis / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D011789:Quantum Theory; D012211:Rhenium / Q000737:chemistry*; D013057:Spectrum Analysis
chemical_list: D056831:Coordination Complexes; D008024:Ligands; D049408:Luminescent Agents; D012211:Rhenium; D001554:Benzene