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Mesomorphism of lanthanide-containing Schiff's base complexes with chloride counterions

K Binnemans, D Moors, TN Parac-Vogt and Rik Van Deun UGent (2002) LIQUID CRYSTALS. 29(9). p.1209-1216
abstract
Liquid crystalline complexes [Ln(LH)(3)Cl-3] have been synthesized, where Ln is a trivalent lanthanide ion (Pr-Lu, except Pm) and where LH is the Schiff's base ligand N-octadecyl-4-tetradecyloxysalicylaldimine. Although the ligand does not exhibit mesomorphism, the complexes do (SmA phase). The mesophase behaviour of these compounds has been investigated by polarizing optical microscopy, differential scanning calorimetry and high temperature X-ray diffraction. The lanthanide complexes have much higher melting and clearing points than comparable complexes with nitrate or dodecyl sulphate counterions. In addition, the transition temperatures are virtually independent of the type of lanthanide ion. This behaviour is opposite to that observed for similar complexes with nitrate counterions [Ln(LH)(3)(NO3)(3)]. The differences in temperature dependence can be related to structural differences. Whereas in the nitrate complexes the Schiff's base ligand binds in a zwitterionic form, two-dimensional H-1 NMR correlation spectroscopy (COSY) of [Lu(LH)(3)Cl-3] gives an indication that in the chloride complexes, besides coordination via the oxygen of molecules in the zwitterionic form, some of the Schiff's base ligands bind in a bidentate fashion (via the phenolic oxygen and the imine nitrogen).
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
CONTAINING LIQUID-CRYSTALS, RARE-EARTH, TRANSITION-TEMPERATURES, METALLOMESOGENS, LIGANDS, ANIONS
journal title
LIQUID CRYSTALS
Liq. Cryst.
volume
29
issue
9
pages
1209 - 1216
Web of Science type
Article
Web of Science id
000178105300012
JCR category
CRYSTALLOGRAPHY
JCR impact factor
1.597 (2002)
JCR rank
6/20 (2002)
JCR quartile
2 (2002)
ISSN
0267-8292
DOI
10.1080/02678290210160060
language
English
UGent publication?
no
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
1190362
handle
http://hdl.handle.net/1854/LU-1190362
date created
2011-03-16 16:13:27
date last changed
2018-01-29 12:12:59
@article{1190362,
  abstract     = {Liquid crystalline complexes [Ln(LH)(3)Cl-3] have been synthesized, where Ln is a trivalent lanthanide ion (Pr-Lu, except Pm) and where LH is the Schiff's base ligand N-octadecyl-4-tetradecyloxysalicylaldimine. Although the ligand does not exhibit mesomorphism, the complexes do (SmA phase). The mesophase behaviour of these compounds has been investigated by polarizing optical microscopy, differential scanning calorimetry and high temperature X-ray diffraction. The lanthanide complexes have much higher melting and clearing points than comparable complexes with nitrate or dodecyl sulphate counterions. In addition, the transition temperatures are virtually independent of the type of lanthanide ion. This behaviour is opposite to that observed for similar complexes with nitrate counterions [Ln(LH)(3)(NO3)(3)]. The differences in temperature dependence can be related to structural differences. Whereas in the nitrate complexes the Schiff's base ligand binds in a zwitterionic form, two-dimensional H-1 NMR correlation spectroscopy (COSY) of [Lu(LH)(3)Cl-3] gives an indication that in the chloride complexes, besides coordination via the oxygen of molecules in the zwitterionic form, some of the Schiff's base ligands bind in a bidentate fashion (via the phenolic oxygen and the imine nitrogen).},
  author       = {Binnemans, K and Moors, D and Parac-Vogt, TN and Van Deun, Rik},
  issn         = {0267-8292},
  journal      = {LIQUID CRYSTALS},
  keyword      = {CONTAINING LIQUID-CRYSTALS,RARE-EARTH,TRANSITION-TEMPERATURES,METALLOMESOGENS,LIGANDS,ANIONS},
  language     = {eng},
  number       = {9},
  pages        = {1209--1216},
  title        = {Mesomorphism of lanthanide-containing Schiff's base complexes with chloride counterions},
  url          = {http://dx.doi.org/10.1080/02678290210160060},
  volume       = {29},
  year         = {2002},
}

Chicago
Binnemans, K, D Moors, TN Parac-Vogt, and Rik Van Deun. 2002. “Mesomorphism of Lanthanide-containing Schiff’s Base Complexes with Chloride Counterions.” Liquid Crystals 29 (9): 1209–1216.
APA
Binnemans, K, Moors, D., Parac-Vogt, T., & Van Deun, R. (2002). Mesomorphism of lanthanide-containing Schiff’s base complexes with chloride counterions. LIQUID CRYSTALS, 29(9), 1209–1216.
Vancouver
1.
Binnemans K, Moors D, Parac-Vogt T, Van Deun R. Mesomorphism of lanthanide-containing Schiff’s base complexes with chloride counterions. LIQUID CRYSTALS. 2002;29(9):1209–16.
MLA
Binnemans, K, D Moors, TN Parac-Vogt, et al. “Mesomorphism of Lanthanide-containing Schiff’s Base Complexes with Chloride Counterions.” LIQUID CRYSTALS 29.9 (2002): 1209–1216. Print.