Electrical properties of condensed phases of the mesogen bis(octa-octadecyloxymethylphthalocyaninato)lutetium

Belarbi, Z.; Maitrot, M.; Ohta, Kazuchika; Simon, Jacques; André, J.‐J.; Petit, P.

doi:10.1016/0009-2614(88)87055-6

Cited by 69 publications

(26 citation statements)

References 11 publications

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“…Cup6 and NiP6 seemingly show both mesophases; these are connected by a phase transition, presumably of second order (CuP6) or very weak first order (NiP6) but easily detected by polarizing microscopy because of sharp texture changes. Except for H2P (7)(8)(9)(10)(11)(12), all of the compounds are mesogenic; a few of them exhibit mesomorphic polymorphism. Melting (C-+D) temperatures range between 40 and 85°C.…”

Section: Resultsmentioning

confidence: 99%

“…Several recent attembts have been reported [ 1-51 to produce conducting liquid crystals. Calamitic liquid crystals from rod-shaped molecules have been found to be insulators and any conductivity formed is ionic in nature [6-71. In the case of the columnar liquid crystal phase of bis(octadecy1 oxymethyl phthalocyaninato) luthetium [8] intracolumnar conduction is observed especially in partially oxidized materials as has been observed for other materials in the solid state [9-lo].…”

Section: Introductionmentioning

confidence: 98%

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Discotic mesomorphism of 2,3,7,8,12,13,17,18-octakis (alkyl-thio) 5,10,15,20 tetraaza porphyrin and its complexes with some divalent transition metal ions Synthesis and characterization

et al. 1992

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New discotic metallomesogens of 2,3,7,8,12,13,17,18-octakis (alkyl-thio) 5,10,15,20 tetraaza porphyrin (H2Pn) and some related complexes, obtained by reaction of first row transition metal ions Ni(II), Co(II), Cu(II), Zn(II) with the free porphyrin, have been prepared. All materials were characterized by DSC measurements and optical observations. The microscopic structure of all mesophases was checked and characterized by X-ray diffraction. Except for H2P(7–12), all of the compounds are mesogenic; a few of them exhibit mesomorphic polymorphism. Melting (C→D) temperatures range from 40 to 85°C. Only NiP4, CoP4 and CuP4 show higher values. Both temperature and ΔH of isotropization (D→I) show a regular trend with respect to the number of carbon atoms in the alkyl chains and of the nature of the metal. ΔH values for complexes with partially filled d-shell metals are very similar and show definite differences with respect to those of Zn(II). Optical and X-ray data in the case of n 7 indicate a columnar mesophase with hexagonal packing whereas in complexes with n < 7 the observed mesophase shows a non-hexagonal columnar packing. CuP6 and NiP6 probably show both mesophases which are connected by a phase transition, presumably of second order or with exceedingly low enthalpy change but easily detected by polarizing microscopy because of sharp texture changes. As expected, no odd–even effect is detectable on the properties of the liquid-crystalline phases as a function of the number of carbon atoms in the aliphatic chains

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Discotic mesomorphism of 2,3,7,8,12,13,17,18-octakis (alkyl-thio) 5,10,15,20 tetraaza porphyrin and its complexes with some divalent transition metal ions Synthesis and characterization

et al. 1992

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“…7 Double decker molecular structure of the alkylthio-group-substituted phthalocyanine rare-earth metal sandwich complex, bis͓octakis͑hexadecylthio͒-phthalocyaninato͔lanthanide͑III͒, is shown in Fig. 1͑a͒.…”

Section: Methodsmentioning

confidence: 99%

Optical properties of substituted phthalocyanine rare-earth metal complexes

Yoshino

Lee

Sonoda

et al. 2000

Journal of Applied Physics

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Comparative study of optical properties of alkylthio-group-substituted phthalocyanine rare-earth metal sandwich complexes (͓(C n S͒ 8 Pc͔ 2 M,MϭEu,Lu,Tb) is presented. Photoluminescence and photoconductivity of ͓(C n S͒ 8 Pc͔ 2 M complex is very weak. Two photoluminescence bands were observed at around 400-650 and 720-800 nm in chloroform solution corresponding to the Soret and Q bands in the absorption spectra, respectively. However, the emission from Eu 3ϩ ion ͑as well as Tb 3ϩ ) was not found compared with other Eu complexes because the 5d levels of the Eu 3ϩ ion lie higher than the triplet level of the ligand. The significant enhancement of the photoconductivity of ͓(C 16 S͒ 8 Pc͔ 2 M after C 60 doping is reported. The photoconductivity is positive at the low electric field in the ohmic regime while it becomes negative at the high electric field upon photoexcitation with strongly absorbed light. The negative photoconductivity is attributed to space-charge effects. The mechanism of photoluminescence and photoconductivity are discussed by taking the electronic energy schemes of phthalocyanine ligands and lanthanide ion and C 60 into consideration.

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“…The synthesis of bis (octaalkyloxyphthalocyaninato) lutetium was published in 1985 [35]. The electrical properties of the columnar mesophases have been studied in the frequency range 10 -3 -10 5 Hz and at 10 GHz [38,39].…”

Section: Nanometric Wires and Transistorsmentioning

confidence: 99%

Micro- and nanotechnologies: dullish electrons and smart molecules

Simon¹

2005

Comptes Rendus. Chimie

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Electrical properties of condensed phases of the mesogen bis(octa-octadecyloxymethylphthalocyaninato)lutetium

Cited by 69 publications

References 11 publications

Discotic mesomorphism of 2,3,7,8,12,13,17,18-octakis (alkyl-thio) 5,10,15,20 tetraaza porphyrin and its complexes with some divalent transition metal ions Synthesis and characterization

Discotic mesomorphism of 2,3,7,8,12,13,17,18-octakis (alkyl-thio) 5,10,15,20 tetraaza porphyrin and its complexes with some divalent transition metal ions Synthesis and characterization

Optical properties of substituted phthalocyanine rare-earth metal complexes

Micro- and nanotechnologies: dullish electrons and smart molecules

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