RT info:eu-repo/semantics/article
T1 Triphenylene-Imidazolium Salts and Their NHC Metal Complexes, Materials with Segregated Multicolumnar Mesophases
A1 Miguel Coello, Ana Beatriz
A1 Bardají Luna, Manuel
A1 Coco Cea, Silverio
A1 Donnio, Bertrand
A1 Heinrich, Benoît
A1 Espinet Rubio, Pablo
AB Two imidazolium salts containing one or two pentadodecyloxytriphenylene units linked through a hexyloxy chain and Br–, [AuBrmCl4–m]−, or [PtBrmCl4–m]2– (m = 0−3) as counterion have been prepared. Reaction of the imidazolium bromides with M2O (M = Cu, Ag), or carbene transmetalation from the silver product, leads to N-heterocyclic carbene complexes [MX(NHC)] (M = Cu, X = Br; M = Au, X = Cl, C≡CPh), [Ag(NHC)2][AgBr2], and [PtCl2(NHC)2], with NHC bearing one or two triphenylene fragments. Except for the gold derivatives and one Cu complex, the rest of them behave as liquid crystals organized in columnar mesophases (rectangular c2mm or p2mg or hexagonal p6mm symmetries) with melting points in the range 30 to 60 °C and clearing points in the range 57–112 °C. The mesophase structures were determined by small-angle X-ray scattering. Structural studies and models point to nanosegregation of triphenylene columns and imidazolium/metal carbene moieties, separated by alkoxy chains, leading to multicolumnar systems. The compounds display emission spectra related to the triphenylene core in solution, in the mesophase, in the isotropic liquid, and in the solid state.
PB American Chemical Society
SN 0020-1669
YR 2018
FD 2018
LK http://uvadoc.uva.es/handle/10324/33435
UL http://uvadoc.uva.es/handle/10324/33435
LA eng
NO Inorganic Chemistry, 2018, 57 (8), pp 4359–4369
NO Producción Científica
DS UVaDOC
RD 25-abr-2024