Discotic liquid crystals of transition metal complexes 44: synthesis of hexaphenoxy-substituted phthalocyanine derivatives showing spontaneous perfect homeotropic alignment

2012 ◽  
Vol 16 (10) ◽  
pp. 1114-1123 ◽  
Author(s):  
Masaaki Ariyoshi ◽  
Makiko Sugibayashi-Kajita ◽  
Ayumi Suzuki-Ichihara ◽  
Takayuki Kato ◽  
Tenpei Kamei ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Liquid Crystals ◽  
Transition Metal ◽  
Transition Metal Complexes ◽  
Discotic Liquid Crystals ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Homeotropic Alignment

We have synthesized novel hexaphenoxy-substituted phthalocyanine derivatives, 2-(12-hydroxydodecyloxy)-3-methoxy-9,10,16,17,23,24-hexakis(3,4-di-n-alkoxyphenoxy)phthalocyaninato copper(II) (abbreviated as Cn(OC12OH)PcCu : n = 10, 12, 14), and investigated their columnar mesomorphism and homeotropic alignment property. These hexaphenoxy-substituted Pc derivatives could be successfully isolated and purified from the mixture products by polarity difference. It was revealed by using polarizing optical microscopic observations, differential scanning calorimetry and temperature-dependent X-ray diffraction studies that each of the hexaphenoxy-substituted Pc derivatives has plural mesophases, and that the tetragonal columnar (Coltet) mesophase shows spontaneous perfect homeotropic alignment between two non-surface-treated glass plates without any defects and polydomain boundaries.

Darstellung und magnetische Eigenschaften einiger kristalliner Nitroxidradikale/Synthesis and Magnetic Properties of Some Crystalline Nitroxide Radicals

2000 ◽  
Vol 55 (7) ◽  
pp. 567-575 ◽  
Author(s):  
K. Griesar ◽  
E. A. Soto-Bustamante ◽  
W. Haase
Keyword(s):  
Differential Scanning Calorimetry ◽  
Magnetic Properties ◽  
Exchange Interactions ◽  
Antiferromagnetic Exchange ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Nitroxide Radicals ◽  
Scanning Calorimetry ◽  
Polarizing Microscopy ◽  
X Ray

Abstract The syntheses of different nitroxide radicals are reported. The thermal behaviour of the ni­ troxide radicals was examined by polarizing microscopy, differential scanning calorimetry as well as X-ray diffraction experiments. Temperature dependent magnetic susceptibility mea­surements were carried out in order to determine the magnetic properties of these nitroxide radicals. The majority of the radicals presented here show weak antiferromagnetic exchange interactions.

scholarly journals Polymorphism of a hexadecane–heptadecane binary system in nanopores

RSC Advances ◽  
2017 ◽  
Vol 7 (18) ◽  
pp. 10737-10747 ◽  
Author(s):  
Jian Sui ◽  
Shi Qi Zhang ◽  
Min Zhai ◽  
Fang Tian ◽  
Jian Zhang ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Binary System ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
Scanning Calorimetry ◽  
Porous Glasses ◽  
X Ray ◽  
Phase Behaviors

Phase behaviors of a hexadecane–heptadecane (n-C16H34–C17H36, C16–C17) binary system in the bulk and in nanopores of controlled porous glasses (CPGs) are investigated using differential scanning calorimetry (DSC) and temperature-dependent powder X-ray diffraction (XRD).

Discotic liquid crystals of transition metal complexes: 28. Temperature-dependent electronic spectra and X-ray structural analysis of discotic liquid crystalline bis(octakisdodecyloxyphthalocyaninato)lutetium(III) complex

2001 ◽  
Vol 05 (01) ◽  
pp. 44-50 ◽  
Author(s):  
RIE NAITO ◽  
KAZUCHIKA OHTA ◽  
HIROFUSA SHIRAI
Keyword(s):  
Thin Film ◽  
Phase Transitions ◽  
Structural Analysis ◽  
Transition Metal Complexes ◽  
Electronic Spectra ◽  
Liquid Crystalline ◽  
Discotic Liquid Crystals ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray

An unidentified mesophase D x of bis(octakisdodecyloxyphthalocyaninato)lutetium(III) reported by us in 1997 was reinvestigated by temperature-dependent X-ray diffraction and temperature-dependent electronic spectra of the thin film. The D x phase was thus established as a novel type of D ro (P21/a) mesophase in which two different stacking distances ht and hf exist. It was also revealed that the step-up increase of electroconductivity is attributable to the step-up enlargement of π-π overlap of Pc macrocycles according to the phase transitions crystal → D ro (P21/a) → D ho . This is strongly related to delocalization of the radical electron.

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