A structural investigation of octa-n-undecoxyphthalocyanine in the solid and liquid-crystalline state and of poly(octa-n-undecoxyphthalocyaninato)siloxane by high-resolution solid-state NMR spectroscopy
Journal Article
·
· Journal of the American Chemical Society; (United States)
- Univ. of Nijmegen, Toernooiveld (Netherlands)
- Univ. of Utrecht, Padualaan (Netherlands)
{sup 13}C high-resolution NMR spectra of octa-n-undecoxyphthalocyanine (Pc) were measured in the solid and in the liquid-crystalline state. In the solid state, crystallographic splittings are observed which can be attributed to distortions of the molecular symmetry of the Pc core. These distortions are probably connected with the tilting angle between the planes of the Pc molecules and the axis of the columns formed by these molecules. Temperature-dependent measurements show that the N-H tautomerism in the Pc core displays no obvious asymmetries. Above 380 K the solid phase of the Pc molecules is transformed into a hexagonal-ordered columnar mesophase. In this mesophase the molecular Pc plane is perpendicular to the stacking axis, with the molecules rotating about the stacking axis. There is no clear deviation from the molecular D{sub 4h} symmetry in the mesophase. The side chains display a liquid-like conformation in the mesophase.
- OSTI ID:
- 5170931
- Journal Information:
- Journal of the American Chemical Society; (United States), Journal Name: Journal of the American Chemical Society; (United States) Vol. 112:24; ISSN 0002-7863; ISSN JACSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
CARBON 13
CARBON ISOTOPES
CRYSTALS
DATA
DISPERSIONS
DYES
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FLUIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
ISOTOPES
LATTICE PARAMETERS
LIGHT NUCLEI
LIQUID CRYSTALS
LIQUIDS
MAGNETIC RESONANCE
MEASURING METHODS
MIXTURES
NUCLEAR MAGNETIC RESONANCE
NUCLEI
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
PHTHALOCYANINES
RESONANCE
SILOXANES
SOLID SOLUTIONS
SOLUTIONS
STABLE ISOTOPES
360602* -- Other Materials-- Structure & Phase Studies
CARBON 13
CARBON ISOTOPES
CRYSTALS
DATA
DISPERSIONS
DYES
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FLUIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
ISOTOPES
LATTICE PARAMETERS
LIGHT NUCLEI
LIQUID CRYSTALS
LIQUIDS
MAGNETIC RESONANCE
MEASURING METHODS
MIXTURES
NUCLEAR MAGNETIC RESONANCE
NUCLEI
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
PHTHALOCYANINES
RESONANCE
SILOXANES
SOLID SOLUTIONS
SOLUTIONS
STABLE ISOTOPES