%0 Journal Article %1 Bodenthin2007 %A Bodenthin, Y. %A Schwarz, G. %A Tomkowicz, Z. %A Nefedov, A. %A Lommel, M. %A Moehwald, H. %A Haase, W. %A Kurth, Dirk G. %A Pietsch, U. %C ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA %D 2007 %I AMER PHYSICAL SOC %J PHYSICAL REVIEW B %K dgkurth %N 6 %R 10.1103/PhysRevB.76.064422 %T Structure-driven remanent high-spin state in metallosupramolecular assemblies %U http://dx.doi.org/10.1103/PhysRevB.76.064422 %V 76 %X A versatile approach designing supramolecular assemblies for molecular magnetism relies on metallosupramolecular polyelectrolyte amphiphile complexes, which are self-assembled from ditopic bisterpyridine ligands, transition metal ions, and amphiphilic molecules. We report on measurements at powdered samples using energy-dispersive small angle x-ray scattering, x-ray magnetic circular dichroism, and magnetic measurements. We observe a spin crossover of the Fe2+ ions into a remanent state above room temperature driven and stabilized by a structural phase transition of the two dimensional amphiphilic matrix of the supramolecular complex. The temperature of spin crossover scales with the number of amphiphilic molecules attached to the polyelectrolyte backbone. The spin crossover itself can be rationalized by a transition of the Fe2+ ions from a S=0, t(2g)(6)e(g)(0) low-spin state to a magnetic S=2, t(2g)(4)e(g)(2) high-spin state and is independent from the number of amphiphiles per unit. The remanence in powdered samples might be caused by the disorder and interdigitation of amphiphilic molecules. Low temperature measurements suggest a possible antiferromagnetic coupling between Fe2+ ions.

@article{Bodenthin2007, abstract = {A versatile approach designing supramolecular assemblies for molecular magnetism relies on metallosupramolecular polyelectrolyte amphiphile complexes, which are self-assembled from ditopic bisterpyridine ligands, transition metal ions, and amphiphilic molecules. We report on measurements at powdered samples using energy-dispersive small angle x-ray scattering, x-ray magnetic circular dichroism, and magnetic measurements. We observe a spin crossover of the Fe2+ ions into a remanent state above room temperature driven and stabilized by a structural phase transition of the two dimensional amphiphilic matrix of the supramolecular complex. The temperature of spin crossover scales with the number of amphiphilic molecules attached to the polyelectrolyte backbone. The spin crossover itself can be rationalized by a transition of the Fe2+ ions from a S=0, t(2g)(6)e(g)(0) low-spin state to a magnetic S=2, t(2g)(4)e(g)(2) high-spin state and is independent from the number of amphiphiles per unit. The remanence in powdered samples might be caused by the disorder and interdigitation of amphiphilic molecules. Low temperature measurements suggest a possible antiferromagnetic coupling between Fe2+ ions.}, added-at = {2011-01-12T12:40:19.000+0100}, address = {ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}, affiliation = {Bodenthin, Y (Reprint Author), Univ Siegen, FB7 Solid State Phys, D-57068 Siegen, Germany. Univ Siegen, FB7 Solid State Phys, D-57068 Siegen, Germany. Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland. Max Planck Inst Colloids \& Interfaces, D-14424 Potsdam, Germany. Jagellonian Univ, Inst Phys, PL-30059 Krakow, Poland. Ruhr Univ Bochum, Inst Expt Phys \& Solid State Phys, D-44780 Bochum, Germany. TH Darmstadt, Inst Phys Chem, D-64287 Darmstadt, Germany. Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan.}, article-number = {064422}, author = {Bodenthin, Y. and Schwarz, G. and Tomkowicz, Z. and Nefedov, A. and Lommel, M. and Moehwald, H. and Haase, W. and Kurth, Dirk G. and Pietsch, U.}, biburl = {https://www.bibsonomy.org/bibtex/2019362ad0d99668d91ebc6ff4787bf36/lctm}, cited-references = {BODENTHIN Y, 2002, J SYNCHROTRON RADI 4, V9, P206. BODENTHIN Y, 2005, J AM CHEM SOC, V127, P3110. BODENTHIN Y, 2005, J PHYS CHEM B, V109, P12795, DOI 10.1021/jp058001. BREUNING E, 2000, ANGEW CHEM INT EDIT, V39, P2504. CANTIN C, 1999, EUR PHYS J B, V12, P525. CHEN CT, 1995, PHYS REV LETT, V75, P152. CHERNYSHOV D, 2004, PHYS REV B, V70, ARTN 094116. CONSTABLE EC, 1999, CHEM-EUR J, V5, P498. GALYAMETDINOV Y, 2001, ANGEW CHEM INT EDIT, V40, P4269. GATTESCHI D, 1994, SCIENCE, V265, P1054. GATTESCHI D, 2004, J MAGN MAGN MATER 2, V272, P1030, DOI 10.1016/j.jmmm.2003.12.004. GRABIS J, 2003, REV SCI INSTRUM, V74, P4048, DOI 10.1063/1.1602932. GUTLICH P, 2001, INTRO PHYS TECHNIQUE, P321. GUTLICH P, 2004, J MAGN MAGN MATER, V233, P49. HALDER GJ, 2002, SCIENCE, V298, P1762. HAYAMI S, 2003, J RADIOANAL NUCL CH, V255, P443. KAHN O, 1998, SCIENCE, V279, P44. KURTH DG, 2000, P NATL ACAD SCI USA, V97, P5704. KURTH DG, 2003, LANGMUIR, V19, P4055, DOI 10.1021/la026757g. LEHN JM, 2002, P NATL ACAD SCI USA, V99, P4762. LEHN JM, 2002, SCIENCE, V295, P2400. LUECKEN H, 1999, MAGNETOCHEMIE. MEISTER A, 2003, CHEMPHYSCHEM, V4, P1095, DOI 10.1002/cphc.200300702. MERTINS HC, 2002, PHYS REV B, V66, ARTN 184404. MERZ L, 1980, J CHEM SOC DA, V1980, P875. PIETSCH U, 2001, NUCL INSTRUM METH 2, V467, P1077. ROJO J, 1999, EUR J INORG CHEM, V3, P517. RUBEN M, 2003, CHEM-EUR J, V9, P4422, DOI 10.1002/chem.200304933. SLICHTER CP, 1972, J CHEM PHYS, V56, P2142. SOYER H, 1999, ADV MATER, V11, P382. WALDMANN O, 1998, PHYS REV B, V58, P3277. WALDMANN O, 2002, INORG CHEM, V45, P6535. WHITESIDES GM, 2002, SCIENCE, V295, P2418. ZAK J, 1991, PHYS REV B, V43, P6423.}, doc-delivery-number = {206AB}, doi = {10.1103/PhysRevB.76.064422}, interhash = {04944a4e8d589b142ab13e9d96e30a90}, intrahash = {019362ad0d99668d91ebc6ff4787bf36}, issn = {1098-0121}, journal = {PHYSICAL REVIEW B}, journal-iso = {Phys. Rev. B}, keywords = {dgkurth}, keywords-plus = {POLYELECTROLYTE-AMPHIPHILE COMPLEX; X-RAY-SCATTERING; TRANSITION; CROSSOVER; TEMPERATURE; PRESSURE; DEVICES; IRON; FILM}, language = {English}, month = aug, number = 6, number-of-cited-references = {34}, publisher = {AMER PHYSICAL SOC}, subject-category = {Physics, Condensed Matter}, times-cited = {1}, timestamp = {2011-01-12T12:40:19.000+0100}, title = {Structure-driven remanent high-spin state in metallosupramolecular assemblies}, type = {Article}, unique-id = {ISI:000249155200075}, url = {http://dx.doi.org/10.1103/PhysRevB.76.064422}, volume = 76, year = 2007 }