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Imidazo[4,5-f]-1,10-phenanthrolines : versatile ligands for the design of metallomesogens

(2008) CHEMISTRY OF MATERIALS. 20(4). p.1278-1291
Author
Organization
Abstract
2-Aryl-substituted imidazo[4,5-f]-1,10-phenanthrolines were used as building blocks for metal-containing liquid crystals (metallomesogens). Imidazo[4,5-f]-1,10-phenanthrolines are versatile ligands because they can form stable complexes with various d-block transition metals, including platinum(II) and rhenium(I), as well as with lanthanide(III) and uranyl ions and they can easily be structurally modified by a judicious choice of benzaldehyde precursor. None of the ligands designed for this study were liquid-crystalline. However, mesomorphism could be induced by their coordination to various metallic fragments. The thermal behavior of the metal complexes depended on the metal-to-ligand ratio and the substitution pattern of the coordinating ligands. Complexes with a metal-to-ligand ratio of 1:1 [ML, with M = Pt(II), Re(I)] were not liquid-crystal line. The lanthanide(III) complexes with a metal-to-ligand ratio of 1:2 [ML2 with M = Ln(III)] formed an enantiotropic cubic mesophase or were not liquid-crystalline, depending on the nature of the lanthanide(III) ion and the substitution pattern of the ligands. A 1:3 uranyl complex of the type [ML3](2+) exhibited a hexagonal columnar mesophase over a broad temperature range. Self-assembled monolayers of a europium(III) complex were investigated by scanning tunneling microscopy, which revealed that the complex formed well-ordered structures over long distances at the 1-octanoic acid-graphite interface. The rhenium(I) complexes and the europium(III) complexes with 2-thenoyl-trifluoroacetonate or dibenzoylmethanate and imidazo[4,5-f]-1,10-phenanthroline showed good luminescence properties.
Keywords
RHENIUM(I) TRICARBONYL COMPLEXES, CONTAINING LIQUID-CRYSTALS, THERMOTROPIC CUBIC MESOPHASES, NONLINEAR-OPTICAL PROPERTIES, TRANSITION-METAL COMPLEXES, LANTHANIDE COMPLEXES, COLUMNAR MESOPHASES, RARE-EARTH, CALAMITIC METALLOMESOGENS, POLYCATENAR MESOGENS

Citation

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MLA
Cardinaels, Thomas, et al. “Imidazo[4,5-f]-1,10-Phenanthrolines : Versatile Ligands for the Design of Metallomesogens.” CHEMISTRY OF MATERIALS, vol. 20, no. 4, 2008, pp. 1278–91.
APA
Cardinaels, T., Ramaekers, J., Nockemann, P., Driesen, K., Van Hecke, K., Van Meervelt, L., … Binnemans, K. (2008). Imidazo[4,5-f]-1,10-phenanthrolines : versatile ligands for the design of metallomesogens. CHEMISTRY OF MATERIALS, 20(4), 1278–1291.
Chicago author-date
Cardinaels, Thomas, Jan Ramaekers, Peter Nockemann, Kris Driesen, Kristof Van Hecke, Luc Van Meervelt, Shengbin Lei, et al. 2008. “Imidazo[4,5-f]-1,10-Phenanthrolines : Versatile Ligands for the Design of Metallomesogens.” CHEMISTRY OF MATERIALS 20 (4): 1278–91.
Chicago author-date (all authors)
Cardinaels, Thomas, Jan Ramaekers, Peter Nockemann, Kris Driesen, Kristof Van Hecke, Luc Van Meervelt, Shengbin Lei, Steven De Feyter, Daniel Guillon, Bertrand Donnio, and Koen Binnemans. 2008. “Imidazo[4,5-f]-1,10-Phenanthrolines : Versatile Ligands for the Design of Metallomesogens.” CHEMISTRY OF MATERIALS 20 (4): 1278–1291.
Vancouver
1.
Cardinaels T, Ramaekers J, Nockemann P, Driesen K, Van Hecke K, Van Meervelt L, et al. Imidazo[4,5-f]-1,10-phenanthrolines : versatile ligands for the design of metallomesogens. CHEMISTRY OF MATERIALS. 2008;20(4):1278–91.
IEEE
[1]
T. Cardinaels et al., “Imidazo[4,5-f]-1,10-phenanthrolines : versatile ligands for the design of metallomesogens,” CHEMISTRY OF MATERIALS, vol. 20, no. 4, pp. 1278–1291, 2008.
@article{2045840,
  abstract     = {2-Aryl-substituted imidazo[4,5-f]-1,10-phenanthrolines were used as building blocks for metal-containing liquid crystals (metallomesogens). Imidazo[4,5-f]-1,10-phenanthrolines are versatile ligands because they can form stable complexes with various d-block transition metals, including platinum(II) and rhenium(I), as well as with lanthanide(III) and uranyl ions and they can easily be structurally modified by a judicious choice of benzaldehyde precursor. None of the ligands designed for this study were liquid-crystalline. However, mesomorphism could be induced by their coordination to various metallic fragments. The thermal behavior of the metal complexes depended on the metal-to-ligand ratio and the substitution pattern of the coordinating ligands. Complexes with a metal-to-ligand ratio of 1:1 [ML, with M = Pt(II), Re(I)] were not liquid-crystal line. The lanthanide(III) complexes with a metal-to-ligand ratio of 1:2 [ML2 with M = Ln(III)] formed an enantiotropic cubic mesophase or were not liquid-crystalline, depending on the nature of the lanthanide(III) ion and the substitution pattern of the ligands. A 1:3 uranyl complex of the type [ML3](2+) exhibited a hexagonal columnar mesophase over a broad temperature range. Self-assembled monolayers of a europium(III) complex were investigated by scanning tunneling microscopy, which revealed that the complex formed well-ordered structures over long distances at the 1-octanoic acid-graphite interface. The rhenium(I) complexes and the europium(III) complexes with 2-thenoyl-trifluoroacetonate or dibenzoylmethanate and imidazo[4,5-f]-1,10-phenanthroline showed good luminescence properties.},
  author       = {Cardinaels, Thomas and Ramaekers, Jan and Nockemann, Peter and Driesen, Kris and Van Hecke, Kristof and Van Meervelt, Luc and Lei, Shengbin and De Feyter, Steven and Guillon, Daniel and Donnio, Bertrand and Binnemans, Koen},
  issn         = {0897-4756},
  journal      = {CHEMISTRY OF MATERIALS},
  keywords     = {RHENIUM(I) TRICARBONYL COMPLEXES,CONTAINING LIQUID-CRYSTALS,THERMOTROPIC CUBIC MESOPHASES,NONLINEAR-OPTICAL PROPERTIES,TRANSITION-METAL COMPLEXES,LANTHANIDE COMPLEXES,COLUMNAR MESOPHASES,RARE-EARTH,CALAMITIC METALLOMESOGENS,POLYCATENAR MESOGENS},
  language     = {eng},
  number       = {4},
  pages        = {1278--1291},
  title        = {Imidazo[4,5-f]-1,10-phenanthrolines : versatile ligands for the design of metallomesogens},
  url          = {http://dx.doi.org/10.1021/cm070637i},
  volume       = {20},
  year         = {2008},
}

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