title: Aggregation-induced emission enhancement in alkoxy-bridged binuclear rhenium(I) complexes: application as sensor for explosives and interaction with microheterogeneous media.
abstract: The aggregation-induced emission enhancement (AIEE) characteristics of the two alkoxy-bridged binuclear Re(I) complexes [{Re(CO)3(1,4-NVP)}2(μ2-OR)2] (1, R = C4H9; 2, C10H21) bearing a long alkyl chain with 4-(1-naphthylvinyl)pyridine (1,4-NVP) ligand are illustrated. These complexes in CH2Cl2 (good solvent) are weakly luminescent, but their intensity increased enormously by almost 500 times by the addition of poor solvent (CH3CN) due to aggregation. By tracking this process via UV-vis absorption and emission spectral and TEM techniques, the enhanced emission is attributed to the formation of nanoaggregates. The nanoaggregate of complex 2 is used as a sensor for nitroaromatic compounds. Furthermore, the study of the photophysical properties of these binuclear Re(I) complexes in cationic, cetyltrimethylammonium bromide (CTAB), anionic, sodium dodecyl sulfate (SDS), and nonionic, p-tert-octylphenoxypolyoxyethanol (TritonX-100, TX-100), micelles as well as in CTAB-hexane-water and AOT-isooctane-water reverse micelles using steady-state and time-resolved spectroscopy and TEM analysis reveals that the nanoaggregates became small and compact size.
authors.affiliation: School of Chemistry, Madurai Kamaraj University , Madurai 625 021, India.
authors.forename: Veerasamy
authors.initials: V
authors.lastname: Sathish
authors.forename: Arumugam
authors.initials: A
authors.lastname: Ramdass
authors.forename: Zong-Zhan
authors.initials: ZZ
authors.lastname: Lu
authors.forename: Murugesan
authors.initials: M
authors.lastname: Velayudham
authors.forename: Pounraj
authors.initials: P
authors.lastname: Thanasekaran
authors.forename: Kuang-Lieh
authors.initials: KL
authors.lastname: Lu
authors.forename: Seenivasan
authors.initials: S
authors.lastname: Rajagopal
mesh_terms: D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D056831:Coordination Complexes / Q000737:chemistry*; D053834:Explosive Agents / Q000032:analysis*; D006586:Hexanes / Q000737:chemistry; D008752:Methylene Chloride / Q000737:chemistry; D008823:Micelles; D011092:Polyethylene Glycols / Q000737:chemistry; D012211:Rhenium / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D014867:Water / Q000737:chemistry
chemical_list: D002593:Cetrimonium Compounds; D056831:Coordination Complexes; D053834:Explosive Agents; D006586:Hexanes; D008823:Micelles; C551282:polyethylene glycol monooctylphenyl ether; D014867:Water; D012967:Sodium Dodecyl Sulfate; D011092:Polyethylene Glycols; D008752:Methylene Chloride; D012211:Rhenium; D000077286:Cetrimonium