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Transition metals complexed to ordered mesophases. Synthesis, mesomorphism, and X-ray and EPR characterization of a homologous series of N-(4-dodecyloxysalicylidene)-4[prime]-alkylanilines complexed to oxovanadium(IV)

Journal Article · · Chemistry of Materials; (United States)
DOI:https://doi.org/10.1021/cm00030a026· OSTI ID:6004264
; ; ;  [1]; ;  [2]; ;  [3]
  1. Universita della Calabira, Arcavacata (Italy)
  2. Universita di Ancona (Italy)
  3. Universita di Firenze (Italy)
+ Show Author Affiliations

A number of mesogenic bis[4-(dodecyloxy)-N-(4[prime]-R[sub n]-phenyl)salicylideneiminato]oxovanadium(IV) complexes (1-7, R[sub n] = CH[sub 3], C[sub 2]H[sub 5], C[sub 3]H[sub 7], C[sub 4]H[sub 9], C[sub 6]H[sub 13], OC[sub 6]H[sub 13], C[sub 8]H[sub 17], respectively) have been synthesized and characterized by polarizing microscope observations, DSC measurements, X-ray diffraction, and EPR spectroscopy. These compounds are thermally stable and do not decompose on melting. Complexes 1-15 show two different solid phases K[sub 1] and K[sub 2]. In addition, 4 and 5 exhibit a liquid-crystalline smectic A phase (monotropic in 4 and enantiotropic in 5). On the other hand, 6 and 7 along with a single solid phase, display a smectic C (enantiotropic in 6 and monotropic in 7) and an enantiotropic smectic A phase. Variable-temperature EPR spectra are accounted for on the basis of paramagnetic metal ions experiencing different magnetic environments. For each mesophase, matching X-ray, and EPR data, the molecular packing mode is suggested. Comparing 1-7 with the homologous copper complexes, the contribution of the metallic center to the mesomorphic properties is discussed. 19 refs., 5 figs., 2 tab.

OSTI ID:
6004264
Journal Information:
Chemistry of Materials; (United States), Journal Name: Chemistry of Materials; (United States) Vol. 5:6; ISSN CMATEX; ISSN 0897-4756
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CALORIMETRY
CHEMICAL PREPARATION
COHERENT SCATTERING
COMPLEXES
CRYSTALS
DIFFRACTION
ELECTRON SPIN RESONANCE
FLUIDS
LIGANDS
LIQUID CRYSTALS
LIQUIDS
MAGNETIC RESONANCE
PHASE STUDIES
RESONANCE
SCATTERING
STABILITY
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
VANADIUM COMPLEXES
X-RAY DIFFRACTION