skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: 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)

Abstract

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.

Authors:
; ; ;  [1]; ;  [2]; ;  [3]
  1. (Universita della Calabira, Arcavacata (Italy))
  2. (Universita di Ancona (Italy))
  3. (Universita di Firenze (Italy))
Publication Date:
OSTI Identifier:
6004264
Resource Type:
Journal Article
Resource Relation:
Journal Name: Chemistry of Materials; (United States); Journal Volume: 5:6
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; VANADIUM COMPLEXES; PHASE STUDIES; CALORIMETRY; CHEMICAL PREPARATION; ELECTRON SPIN RESONANCE; LIGANDS; LIQUID CRYSTALS; STABILITY; X-RAY DIFFRACTION; COHERENT SCATTERING; COMPLEXES; CRYSTALS; DIFFRACTION; FLUIDS; LIQUIDS; MAGNETIC RESONANCE; RESONANCE; SCATTERING; SYNTHESIS; TRANSITION ELEMENT COMPLEXES; 360202* - Ceramics, Cermets, & Refractories- Structure & Phase Studies

Citation Formats

Ghedini, M., Morrone, S., Bartolino, R., Formoso, V., Francescangeli, O., Bin Yang, Gatteschi, D., and Zanchini, C. 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). United States: N. p., 1993. Web. doi:10.1021/cm00030a026.
Ghedini, M., Morrone, S., Bartolino, R., Formoso, V., Francescangeli, O., Bin Yang, Gatteschi, D., & Zanchini, C. 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). United States. doi:10.1021/cm00030a026.
Ghedini, M., Morrone, S., Bartolino, R., Formoso, V., Francescangeli, O., Bin Yang, Gatteschi, D., and Zanchini, C. Tue . "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)". United States. doi:10.1021/cm00030a026.
@article{osti_6004264,
title = {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)},
author = {Ghedini, M. and Morrone, S. and Bartolino, R. and Formoso, V. and Francescangeli, O. and Bin Yang and Gatteschi, D. and Zanchini, C.},
abstractNote = {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.},
doi = {10.1021/cm00030a026},
journal = {Chemistry of Materials; (United States)},
number = ,
volume = 5:6,
place = {United States},
year = {Tue Jun 01 00:00:00 EDT 1993},
month = {Tue Jun 01 00:00:00 EDT 1993}
}