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Tuning the Structure and the Magnetic Properties of Metallo-supramolecular Polyelectrolyte-Amphiphile Complexes.
MedLine Citation:
PMID:  21192657     Owner:  NLM     Status:  Publisher    
Self-assembly of Fe(2+) ions and the rigid ditopic ligand 1,4-bis(2,2':6',2''-terpyridin-4'-yl)benzene results in metallo-supramolecular coordination polyelectrolytes (MEPE). Sequential self-assembly of MEPE and dialkyl phosphoric acid esters of varying chain length via electrostatic interactions leads to the corresponding polyelectrolyte-amphiphile complexes (PAC), which have liquid-crystalline properties. The PACs have a stratified architecture where the MEPE is embedded in between the amphiphile layers. Upon heating above room temperature, the PACs show either a reversible or an irreversible spin-crossover (SCO) in a temperature range from 360 to 460 K depending on the architecture of the amphiphilic matrix. As the number of amphiphiles per metal ion is increased in the sequence 1:2, 1:4, and 1:6, the temperature of the SCO is shifted to higher values whereas the amphiphile chain length does not have a significant impact on the SCO temperature. In summary, we describe in this article how the structure and the magnetic response function of PACs can be tailored through the design of the ligand and the composition. To investigate the structure and the magnetic behavior, we use X-ray scattering, X-ray absorption spectroscopy, differential scanning calorimetry, faraday-balance, and superconducting quantum interference measurements in combination with molecular modeling.
Guntram Schwarz; Yves Bodenthin; Zbigniew Tomkowicz; Wolfgang Haase; Thomas Geue; Joachim Kohlbrecher; Ullrich Pietsch; Dirk G Kurth
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2010-12-30
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  -     ISSN:  1520-5126     ISO Abbreviation:  -     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2011-1-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Julius-Maximilians University Würzburg, Chemical Technology of Advanced Materials, Röntgenring 11, D-97070 Würzburg, Germany, Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen-PSI, Switzerland, Institute of Physical Chemistry, Darmstadt University of Technology, Petersenstrasse 20, D-64287, Germany, Institute of Physics, Jagellonian University, Reymonta 4, 30-059 Kraków, Poland, Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland, University of Siegen, FB7 Solid State Physics, D-57068, Siegen, Germany, and Fraunhofer ISC, Neunerplatz 2, D-97082 Würzburg, Germany.
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