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Gütlich P, Lehnis B, Strähle J. Gemischtvalente Bromoaurate(I,III) und ihre Mößbauer-Spektren / Mixed Valent Bromo Aurates(I.III) and their Mößbauer Spectra. Zeitschrift für Naturforschung B 2014. [DOI: 10.1515/znb-1982-0505] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
New nonstoichiometric cesium bromo aurates(I,III) Cs1+x(AuBr4)(AuBr2, Br3,Br)x have been synthesized, in which the almost equally shaped anions AuBr3- and Br3- can interchange themselves. The compounds crystallize in a disordered cubic perovskite structure with a = 547.5 pm or in a tetragonal superstructure with a 16-fold perovskite cell (a = 1553, c = 1099 pm). The investigations show that other bromoaurates as the previously reported "Cs2AgAuBr6" can contain perceptible amounts of Br3- ions also. The IR and 197Au Mössbauer spectra of the new bromoaurates and of Cs2AuoBr6 are discussed
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Affiliation(s)
- P. Gütlich
- Institut für Anorganische Chemie und Analytische Chemie der Johannes-Gutenberg-Universität Mainz, Joh.-Joachim-Becher-Weg 24, D-6500 Mainz
| | - B. Lehnis
- Institut für Anorganische Chemie der Universität Tübingen, Auf der Morgenstelle 18, D-7400 Tübingen
| | - J. Strähle
- Institut für Anorganische Chemie der Universität Tübingen, Auf der Morgenstelle 18, D-7400 Tübingen
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Gütlich P, Odar S, Walcher D. Notizen: Mößbauer- Messungen an Krypton-83 in einigen 83RbX-Verbindungen (X = F, Cl, Br, OH). Zeitschrift für Naturforschung B 2014. [DOI: 10.1515/znb-1970-1026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- P. Gütlich
- E. Zintl- Institut für Anorganische und Physikalische Chemie und Institut für Technische Kernphysik der Technischen Hochschule Darmstadt
| | - S. Odar
- E. Zintl- Institut für Anorganische und Physikalische Chemie und Institut für Technische Kernphysik der Technischen Hochschule Darmstadt
| | - D. Walcher
- E. Zintl- Institut für Anorganische und Physikalische Chemie und Institut für Technische Kernphysik der Technischen Hochschule Darmstadt
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König L, Gaube J, Meisel W, Gütlich P, Gerhard W, Plog C. The influence of water and of alkali promotor on the carbon number distribution of fischer-tropsch products formed over iron catalysts. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/bbpc.19870910209] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Kusz J, Nowak M, Petřiček V, Zubko M, Gütlich P. Long range ordering in the spin crossover compound [Fe(5-NO 2-sal-N(1,4,7,10))]. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311080871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Zubko M, Kusz J, Fitch A, Gütlich P. Phase and spin transition in the spin crossover compound [Fe(dpp) 2(NCS) 2]·py. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311083668] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
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Seredyuk M, Gaspar AB, Ksenofontov V, Galyametdinov Y, Verdaguer M, Villain F, Gütlich P. Spin-Crossover and Liquid Crystal Properties in 2D Cyanide-Bridged FeII−MI/II Metalorganic Frameworks. Inorg Chem 2010; 49:10022-31. [DOI: 10.1021/ic101304v] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Seredyuk
- Institut für Anorganische und Analytische Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany
| | - A. B. Gaspar
- Institut de Ciència Molecular (ICMOL)/Departament de Química Inorgànica, Universitat de València, Edifici de Instituts de Paterna, Apartat de Correus 22085, 46071 València, Spain
| | - V. Ksenofontov
- Institut für Anorganische und Analytische Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany
| | - Y. Galyametdinov
- Kazan Physical Technical Institute, Russian Academy of Science, Sibirsky Tract 10/7, 420029, Kazan, Russia
| | - M. Verdaguer
- Institut Parisien de Chimie Moléculaire, UMR CNRS 7201, FR-CNRS 2769, Université Pierre et Marie Curie, 4 place Jussieu, case courrier 42, 75252 Paris Cedex 05, France
| | - F. Villain
- Institut Parisien de Chimie Moléculaire, UMR CNRS 7201, FR-CNRS 2769, Université Pierre et Marie Curie, 4 place Jussieu, case courrier 42, 75252 Paris Cedex 05, France
| | - P. Gütlich
- Institut für Anorganische und Analytische Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany
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Bhattacharjee A, Bałanda M, Miyazaki Y, Sorai M, Gütlich P. Uncompensated magnetization in the layered molecular antiferromagnet {N(n-C5H11)4[MnIIFeIII(ox)3]}∞. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.06.081] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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9
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Seredyuk M, Gaspar AB, Ksenofontov V, Verdaguer M, Villain F, Gütlich P. Thermal- and Light-Induced Spin Crossover in Novel 2D Fe(II) Metalorganic Frameworks {Fe(4-PhPy)2[MII(CN)x]y}·sH2O: Spectroscopic, Structural, and Magnetic Studies. Inorg Chem 2009; 48:6130-41. [DOI: 10.1021/ic900491r] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M. Seredyuk
- Institut für Anorganische und Analytische Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany
| | - A. B. Gaspar
- Institut de Ciència Molecular (ICMOL)/Departament de Química Inorgànica, Universitat de València, Edifici de Instituts de Paterna, Apartat de Correus 22085, 46071 València, Spain
| | - V. Ksenofontov
- Institut für Anorganische und Analytische Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany
| | - M. Verdaguer
- Institut Parisien de Chimie Moléculaire, UMR CNRS 7201, FR-CNRS 2769, Université Pierre et Marie Curie, 4 place Jussieu, case courrier 42, 75252 Paris Cedex 05, France
| | - F. Villain
- Institut Parisien de Chimie Moléculaire, UMR CNRS 7201, FR-CNRS 2769, Université Pierre et Marie Curie, 4 place Jussieu, case courrier 42, 75252 Paris Cedex 05, France
| | - P. Gütlich
- Institut für Anorganische und Analytische Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany
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Bhattacharjee A, Ksenofontov V, Goodwin HA, Gütlich P. Pressure-induced hysteresis in the high spin [Formula: see text] low spin transition in bis(2,4-bis(pyridin-2-yl)thiazole) iron(II) tetrafluoroborate. J Phys Condens Matter 2009; 21:026011. [PMID: 21814004 DOI: 10.1088/0953-8984/21/2/026011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Studies of the spin transition behavior of the mononuclear compound [Fe(pythiaz)(2)](BF(4))(2) have been carried out under hydrostatic pressures up to 9.13 kbar in the 5-300 K temperature range. Under ambient pressure this compound exhibits an approximately half-step (incomplete) HS [Formula: see text] LS transition with T(1/2) = 146 K without any thermal hysteresis. At pressures up to 4.5 kbar the behavior remains similar but with an upward displacement of T(1/2) and a slight decrease in the residual high spin fraction at low T. Application of higher pressures resulted in an almost complete two-step spin transition with several unusual pressure effects. Along with the expected pressure dependence of T(1/2) the surprising appearance of hysteresis in the spin transition curves was observed. It is suggested that the likely origin of this unprecedented behavior is a pressure-induced structural change.
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Affiliation(s)
- A Bhattacharjee
- Institut für Anorganische Chemie und Analytische Chemie, Johannes-Gutenberg Universität, D-55099 Mainz, Germany. Department of Physics, Visva-Bharati University, Santiniketan 731235, India
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Bhattacharjee A, Kusz J, Zubko M, Goodwin H, Gütlich P. Synchrotron powder-diffraction study of the spin transition compound [Fe(bpp)2](NCS)2·2H2O and soft X-ray-induced structural phase conversion. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2008.05.033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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12
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Baldé C, Desplanches C, Gütlich P, Freysz E, Létard J. Effect of the metal dilution on the thermal and light-induced spin transition in [FexMn1−x(bpp)2](NCSe)2: When T(LIESST) reaches T1/2. Inorganica Chim Acta 2008. [DOI: 10.1016/j.ica.2008.03.124] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Seredyuk M, Gaspar AB, Ksenofontov V, Galyametdinov Y, Kusz J, Gütlich P. Does the Solid−Liquid Crystal Phase Transition Provoke the Spin-State Change in Spin-Crossover Metallomesogens? J Am Chem Soc 2008; 130:1431-9. [DOI: 10.1021/ja077265z] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Seredyuk
- Institut für Anorganische und Analystiche Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany, Institut de Ciència Molecular/Departament de Química Inorgànica, Universitat de València, Edifici de Instituts de Paterna, Apartat de Correus 22085, E-46071 València, Spain, Kazan Physical Technical Institute, Russian Academy of Science, Sibirsky Tract 10/7, 420029, Kazan, Russia, and Institute of Physics, University of Silesia, 4 Uniwersytecka Street, 40007 Katowice, Poland
| | - A. B. Gaspar
- Institut für Anorganische und Analystiche Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany, Institut de Ciència Molecular/Departament de Química Inorgànica, Universitat de València, Edifici de Instituts de Paterna, Apartat de Correus 22085, E-46071 València, Spain, Kazan Physical Technical Institute, Russian Academy of Science, Sibirsky Tract 10/7, 420029, Kazan, Russia, and Institute of Physics, University of Silesia, 4 Uniwersytecka Street, 40007 Katowice, Poland
| | - V. Ksenofontov
- Institut für Anorganische und Analystiche Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany, Institut de Ciència Molecular/Departament de Química Inorgànica, Universitat de València, Edifici de Instituts de Paterna, Apartat de Correus 22085, E-46071 València, Spain, Kazan Physical Technical Institute, Russian Academy of Science, Sibirsky Tract 10/7, 420029, Kazan, Russia, and Institute of Physics, University of Silesia, 4 Uniwersytecka Street, 40007 Katowice, Poland
| | - Y. Galyametdinov
- Institut für Anorganische und Analystiche Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany, Institut de Ciència Molecular/Departament de Química Inorgànica, Universitat de València, Edifici de Instituts de Paterna, Apartat de Correus 22085, E-46071 València, Spain, Kazan Physical Technical Institute, Russian Academy of Science, Sibirsky Tract 10/7, 420029, Kazan, Russia, and Institute of Physics, University of Silesia, 4 Uniwersytecka Street, 40007 Katowice, Poland
| | - J. Kusz
- Institut für Anorganische und Analystiche Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany, Institut de Ciència Molecular/Departament de Química Inorgànica, Universitat de València, Edifici de Instituts de Paterna, Apartat de Correus 22085, E-46071 València, Spain, Kazan Physical Technical Institute, Russian Academy of Science, Sibirsky Tract 10/7, 420029, Kazan, Russia, and Institute of Physics, University of Silesia, 4 Uniwersytecka Street, 40007 Katowice, Poland
| | - P. Gütlich
- Institut für Anorganische und Analystiche Chemie, Johannes-Gutenberg-Universität, Staudinger-Weg 9, D-55099 Mainz, Germany, Institut de Ciència Molecular/Departament de Química Inorgànica, Universitat de València, Edifici de Instituts de Paterna, Apartat de Correus 22085, E-46071 València, Spain, Kazan Physical Technical Institute, Russian Academy of Science, Sibirsky Tract 10/7, 420029, Kazan, Russia, and Institute of Physics, University of Silesia, 4 Uniwersytecka Street, 40007 Katowice, Poland
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14
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Bhattacharjee A, van Koningsbruggen PJ, Hibbs W, Miller JS, Gütlich P. Study of thermal spin crossover in [Fe(II)(isoxazole)(6)](BF(4))(2) with Mössbauer spectroscopy. J Phys Condens Matter 2007; 19:406202. [PMID: 22049101 DOI: 10.1088/0953-8984/19/40/406202] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
(57)Fe Mössbauer spectroscopy of the mononuclear [Fe(II)(isoxazole)(6)](BF(4))(2) compound has been studied to reveal the thermal spin crossover of Fe(II) between low-spin (S = 0) and high-spin (S = 2) states. A temperature-dependent spin transition curve has been constructed with the least-square fitted data obtained from the Mössbauer spectra measured at various temperatures in the 240-60 K range during the cooling and heating cycle. The compound exhibits a temperature-dependent two-step spin transition phenomenon with T(SCO) (step 1) = 92 and T(SCO) (step 2) = 191 K. The compound has three high-spin Fe(II) sites at the highest temperature of study; among them, two have slightly different coordination environments. These two Fe(II) sites are found to undergo a spin transition, while the third Fe(II) site retains the high-spin state over the whole temperature range. Possible reasons for the formation of the two steps in the spin transition curve are discussed. The observations made from the present study are in complete agreement with those envisaged from earlier magnetic and structural studies made on [Fe(II)(isoxazole)(6)](BF(4))(2), but highlights the nature of the spin crossover mechanism.
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Affiliation(s)
- A Bhattacharjee
- Institut für Anorganische Chemie und Analytische Chemie, Johannes-Gutenberg Universität, D-55099 Mainz, Germany
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Mukhopadhyay U, Grunert CM, Kusz J, Reiman S, Gütlich P, Bernal I. 57Fe Mössbauer spectroscopy predicts superstructure for K0.08[Cu(II)(N,N'app)Cl]2[Fe(III)(CN)6].0.92H3O.3H2O. Chem Commun (Camb) 2007:1444-6. [PMID: 17389987 DOI: 10.1039/b615130b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The compound [Cu(N,N'app)Cl](2)[Fe(CN)(6)].xH(2)O, with N,N'app being bis(N,N'-3-aminopropylpiperazine), was prepared and its structure determined by single crystal X-ray analysis, confirming a ratio of two copper complexes to one iron complex; (57)Fe Mössbauer spectra showed three quadrupole doublets typical of iron(iii) low spin species which call for the presence of a superstructure.
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Affiliation(s)
- Uday Mukhopadhyay
- University of Houston, Chemistry Department, Houston, TX 77204-5003, USA
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Morris RV, Klingelhöfer G, Schröder C, Rodionov DS, Yen A, Ming DW, de Souza PA, Wdowiak T, Fleischer I, Gellert R, Bernhardt B, Bonnes U, Cohen BA, Evlanov EN, Foh J, Gütlich P, Kankeleit E, McCoy T, Mittlefehldt DW, Renz F, Schmidt ME, Zubkov B, Squyres SW, Arvidson RE. Mössbauer mineralogy of rock, soil, and dust at Meridiani Planum, Mars: Opportunity's journey across sulfate-rich outcrop, basaltic sand and dust, and hematite lag deposits. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2006je002791] [Citation(s) in RCA: 183] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - G. Klingelhöfer
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
| | - C. Schröder
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
| | - D. S. Rodionov
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
- Space Research Institute IKI; Moscow Russia
| | - A. Yen
- Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA
| | - D. W. Ming
- NASA Johnson Space Center; Houston Texas USA
| | - P. A. de Souza
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
- CVRD Group; Rio de Janeiro Brazil
| | - T. Wdowiak
- Department of Physics; University of Alabama at Birmingham; Birmingham Alabama USA
| | - I. Fleischer
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
| | - R. Gellert
- Department of Physics; University of Guelph; Guelph, Ontario Canada
| | - B. Bernhardt
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
| | - U. Bonnes
- Darmstadt University of Technology; Darmstadt Germany
| | - B. A. Cohen
- Institute of Meteoritics; University of New Mexico; Albuquerque, NM USA
| | | | - J. Foh
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
- Darmstadt University of Technology; Darmstadt Germany
| | - P. Gütlich
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
| | - E. Kankeleit
- Darmstadt University of Technology; Darmstadt Germany
| | - T. McCoy
- Department of Mineral Sciences, National Museum of Natural History; Smithsonian Institution; Washington, DC USA
| | | | - F. Renz
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
| | - M. E. Schmidt
- Department of Mineral Sciences, National Museum of Natural History; Smithsonian Institution; Washington, DC USA
| | - B. Zubkov
- Space Research Institute IKI; Moscow Russia
| | - S. W. Squyres
- Department of Astronomy; Cornell University; Ithaca New York USA
| | - R. E. Arvidson
- Department Earth and Planetary Sciences; Washington University; St. Louis Missouri USA
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Bhattacharjee A, Kusz J, Ksenofontov V, Sugiyarto K, Goodwin H, Gütlich P. X-ray powder diffraction and LIESST-effect of the spin transition material [Fe(bpp)2](NCS)2·2H2O. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.09.052] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Morris RV, Klingelhöfer G, Schröder C, Rodionov DS, Yen A, Ming DW, de Souza PA, Fleischer I, Wdowiak T, Gellert R, Bernhardt B, Evlanov EN, Zubkov B, Foh J, Bonnes U, Kankeleit E, Gütlich P, Renz F, Squyres SW, Arvidson RE. Mössbauer mineralogy of rock, soil, and dust at Gusev crater, Mars: Spirit's journey through weakly altered olivine basalt on the plains and pervasively altered basalt in the Columbia Hills. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005je002584] [Citation(s) in RCA: 263] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - G. Klingelhöfer
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
| | - C. Schröder
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
| | - D. S. Rodionov
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
- Space Research Institute IKI; Moscow Russia
| | - A. Yen
- Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA
| | - D. W. Ming
- NASA Johnson Space Center; Houston Texas USA
| | - P. A. de Souza
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
- CVRD Group; Vitoria Brazil
| | - I. Fleischer
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
| | - T. Wdowiak
- Department of Physics; University of Alabama at Birmingham; Birmingham Alabama USA
| | - R. Gellert
- Department of Physics; University of Guelph; Guelph, Ontario Canada
| | - B. Bernhardt
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
| | | | - B. Zubkov
- Space Research Institute IKI; Moscow Russia
| | - J. Foh
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
- Darmstadt University of Technology; Darmstadt Germany
| | - U. Bonnes
- Darmstadt University of Technology; Darmstadt Germany
| | - E. Kankeleit
- Darmstadt University of Technology; Darmstadt Germany
| | - P. Gütlich
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
| | - F. Renz
- Institut für Anorganische und Analytische Chemie; Johannes Gutenberg-Universität; Mainz Germany
| | - S. W. Squyres
- Center for Radiophysics and Space Research; Cornell University; Ithaca New York USA
| | - R. E. Arvidson
- Department of Earth and Planetary Sciences; Washington University; St. Louis Missouri USA
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Floquet S, Simaan AJ, Rivière E, Nierlich M, Thuéry P, Ensling J, Gütlich P, Girerd JJ, Boillot ML. Spin crossover of ferric complexes with catecholate derivatives. Single-crystal X-ray structure, Magnetic and Mössbauer investigations. Dalton Trans 2005:1734-42. [PMID: 15852126 DOI: 10.1039/b418294d] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Complexes of general formula [(TPA)Fe(R-Cat)]X.nS were synthesised with different catecholate derivatives and anions (TPA = tris(2-pyridylmethyl)amine, R-Cat2- = 4,5-(NO2)2-Cat2- denoted DNC(2-); 3,4,5,6-Cl4-Cat2- denoted TCC2-; 3-OMe-Cat(2-); 4-Me-Cat(2-) and X = BPh4-; NO3-; PF6-; ClO4-; S = solvent molecule). Their magnetic behaviours in the solid state show a general feature along the series, viz., the occurrence of a thermally-induced spin crossover process. The transition curves are continuous with transition temperatures ranging from ca. 84 to 257 K. The crystal structures of [(TPA)Fe(DNC)]X (X = PF6-; BPh4-) and [(TPA)Fe(TCC)]X.nS (X = PF6-; NO3- and n= 1, S = H2O; ClO4- and n= 1, S = H2O; BPh4- and n= 1, S = C3H6O) were solved at 100 (or 123 K) and 293 K. For those two systems, the characteristics of the [FeN(4)O(2)] coordination core and those of the dioxolene ligands appear to be consistent with a prevailing Fe(III)-catecholate formulation. This feature is in contrast with the large quantum mixing between Fe(III)-catecholate and Fe(II)-semiquinonate forms recently observed with the more electron donating simple catecholate dianion. The thermal spin crossover process is accompanied by significant changes of the molecular structures as shown by the average variation of the metal-ligand bond distances which can be extrapolated for a complete spin conversion from ca. 0.123 to 0.156 A. The different space groups were retained in the low- and high-temperature phases.
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Affiliation(s)
- S Floquet
- Laboratoire de Chimie Inorganique, UMR 8613, ICMMO, Bâtiment 420, Universite Paris-Sud, 91405 Orsay, France
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Klingelhöfer G, Morris RV, Bernhardt B, Schröder C, Rodionov DS, de Souza PA, Yen A, Gellert R, Evlanov EN, Zubkov B, Foh J, Bonnes U, Kankeleit E, Gütlich P, Ming DW, Renz F, Wdowiak T, Squyres SW, Arvidson RE. Jarosite and Hematite at Meridiani Planum from Opportunity's Mössbauer Spectrometer. Science 2004; 306:1740-5. [PMID: 15576610 DOI: 10.1126/science.1104653] [Citation(s) in RCA: 193] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Mossbauer spectra measured by the Opportunity rover revealed four mineralogical components in Meridiani Planum at Eagle crater: jarosite- and hematite-rich outcrop, hematite-rich soil, olivine-bearing basaltic soil, and a pyroxene-bearing basaltic rock (Bounce rock). Spherules, interpreted to be concretions, are hematite-rich and dispersed throughout the outcrop. Hematitic soils both within and outside Eagle crater are dominated by spherules and their fragments. Olivine-bearing basaltic soil is present throughout the region. Bounce rock is probably an impact erratic. Because jarosite is a hydroxide sulfate mineral, its presence at Meridiani Planum is mineralogical evidence for aqueous processes on Mars, probably under acid-sulfate conditions.
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Affiliation(s)
- G Klingelhöfer
- Institut für Anorganische und Analytische Chemie, Johannes Gutenberg-Universität, Staudinger Weg 9, D-55128 Mainz, Germany.
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21
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Garcia Y, Ksenofontov V, Campbell SJ, Lord JS, Boland Y, Gütlich P. Muon Spin Relaxation Study of the Spin Transition Compound [Fe(Phen)2(NCS)2]. J Phys Chem B 2004. [DOI: 10.1021/jp046695y] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Y. Garcia
- Unité de Chimie des Matériaux Inorganiques et Organiques, Département de Chimie, Faculté des Sciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium, Institut für Anorganische Chemie und Analytische Chemie, Universität Mainz, 55099 Mainz, Germany, School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia, and ISIS, Rutherford Appleton Laboratory, Chilton, Didcot,
| | - V. Ksenofontov
- Unité de Chimie des Matériaux Inorganiques et Organiques, Département de Chimie, Faculté des Sciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium, Institut für Anorganische Chemie und Analytische Chemie, Universität Mainz, 55099 Mainz, Germany, School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia, and ISIS, Rutherford Appleton Laboratory, Chilton, Didcot,
| | - S. J. Campbell
- Unité de Chimie des Matériaux Inorganiques et Organiques, Département de Chimie, Faculté des Sciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium, Institut für Anorganische Chemie und Analytische Chemie, Universität Mainz, 55099 Mainz, Germany, School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia, and ISIS, Rutherford Appleton Laboratory, Chilton, Didcot,
| | - J. S. Lord
- Unité de Chimie des Matériaux Inorganiques et Organiques, Département de Chimie, Faculté des Sciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium, Institut für Anorganische Chemie und Analytische Chemie, Universität Mainz, 55099 Mainz, Germany, School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia, and ISIS, Rutherford Appleton Laboratory, Chilton, Didcot,
| | - Y. Boland
- Unité de Chimie des Matériaux Inorganiques et Organiques, Département de Chimie, Faculté des Sciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium, Institut für Anorganische Chemie und Analytische Chemie, Universität Mainz, 55099 Mainz, Germany, School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia, and ISIS, Rutherford Appleton Laboratory, Chilton, Didcot,
| | - P. Gütlich
- Unité de Chimie des Matériaux Inorganiques et Organiques, Département de Chimie, Faculté des Sciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium, Institut für Anorganische Chemie und Analytische Chemie, Universität Mainz, 55099 Mainz, Germany, School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia, and ISIS, Rutherford Appleton Laboratory, Chilton, Didcot,
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22
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Gütlich P. Atombau und chemische Bindung. Von F. Seel. Ferdinand Enke Verlag, Stuttgart 1969. 7., verbess. Aufl., VII, 96 S., 63 Abb., 7 Tab., geh. DM 9,80/geb. DM 12,80. CHEM UNSERER ZEIT 2004. [DOI: 10.1002/ciuz.19690030509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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Meisel W, Gütlich P. Study of the phase composition of iron-containing Langmuir-Blodgett layers before and after thermal and chemical treatment. SURF INTERFACE ANAL 2004. [DOI: 10.1002/sia.740190184] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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24
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Morris RV, Klingelhöfer G, Bernhardt B, Schröder C, Rodionov DS, De Souza PA, Yen A, Gellert R, Evlanov EN, Foh J, Kankeleit E, Gütlich P, Ming DW, Renz F, Wdowiak T, Squyres SW, Arvidson RE. Mineralogy at Gusev Crater from the Mossbauer Spectrometer on the Spirit Rover. Science 2004; 305:833-6. [PMID: 15297666 DOI: 10.1126/science.1100020] [Citation(s) in RCA: 241] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Mössbauer spectra measured on Mars by the Spirit rover during the primary mission are characterized by two ferrous iron doublets (olivine and probably pyroxene) and a ferric iron doublet (tentatively associated to nanophase ferric iron oxide). Two sextets resulting from nonstoichiometric magnetite are also present, except for a coating on the rock Mazatzal, where a hematite-like sextet is present. Greater proportions of ferric-bearing phases are associated with undisturbed soils and rock surfaces as compared to fresh rock surfaces exposed by grinding. The ubiquitous presence of olivine in soil suggests that physical rather than chemical weathering processes currently dominate at Gusev crater.
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Affiliation(s)
- R V Morris
- NASA Johnson Space Center, Houston, TX, USA.
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25
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Ksenofontov V, Gaspar AB, Levchenko G, Fitzsimmons B, Gütlich P. Pressure Effect on Spin Crossover in [Fe(phen)2(NCS)2] and [CrI2(depe)2]. J Phys Chem B 2004. [DOI: 10.1021/jp049512g] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- V. Ksenofontov
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg Universität, Staudinger Weg 9, D-55099 Mainz, Germany, and Donetsk Physical-Technical Institute, National Academy of Science of Ukraine, R. Luxemburg Strasse 72, Donetsk, 83114 Ukraine
| | - A. B. Gaspar
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg Universität, Staudinger Weg 9, D-55099 Mainz, Germany, and Donetsk Physical-Technical Institute, National Academy of Science of Ukraine, R. Luxemburg Strasse 72, Donetsk, 83114 Ukraine
| | - G. Levchenko
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg Universität, Staudinger Weg 9, D-55099 Mainz, Germany, and Donetsk Physical-Technical Institute, National Academy of Science of Ukraine, R. Luxemburg Strasse 72, Donetsk, 83114 Ukraine
| | - B. Fitzsimmons
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg Universität, Staudinger Weg 9, D-55099 Mainz, Germany, and Donetsk Physical-Technical Institute, National Academy of Science of Ukraine, R. Luxemburg Strasse 72, Donetsk, 83114 Ukraine
| | - P. Gütlich
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg Universität, Staudinger Weg 9, D-55099 Mainz, Germany, and Donetsk Physical-Technical Institute, National Academy of Science of Ukraine, R. Luxemburg Strasse 72, Donetsk, 83114 Ukraine
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26
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Campbell SJ, Ksenofontov V, Garcia Y, Lord JS, Boland Y, Gütlich P. Muon Spin Rotation and Mössbauer Investigations of the Spin Transition in [Fe(ptz)6](ClO4)2. J Phys Chem B 2003. [DOI: 10.1021/jp036078u] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- S. J. Campbell
- Institut für Anorganische Chemie und Analytische Chemie, Universität Mainz, 55099 Mainz, Germany, School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia, Unité de Chimie des Matériaux Inorganiques et Organiques, Département de Chimie, Faculté des Sciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium, and ISIS, Rutherford Appleton Laboratory, Chilton, Didcot,
| | - V. Ksenofontov
- Institut für Anorganische Chemie und Analytische Chemie, Universität Mainz, 55099 Mainz, Germany, School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia, Unité de Chimie des Matériaux Inorganiques et Organiques, Département de Chimie, Faculté des Sciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium, and ISIS, Rutherford Appleton Laboratory, Chilton, Didcot,
| | - Y. Garcia
- Institut für Anorganische Chemie und Analytische Chemie, Universität Mainz, 55099 Mainz, Germany, School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia, Unité de Chimie des Matériaux Inorganiques et Organiques, Département de Chimie, Faculté des Sciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium, and ISIS, Rutherford Appleton Laboratory, Chilton, Didcot,
| | - J. S. Lord
- Institut für Anorganische Chemie und Analytische Chemie, Universität Mainz, 55099 Mainz, Germany, School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia, Unité de Chimie des Matériaux Inorganiques et Organiques, Département de Chimie, Faculté des Sciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium, and ISIS, Rutherford Appleton Laboratory, Chilton, Didcot,
| | - Y. Boland
- Institut für Anorganische Chemie und Analytische Chemie, Universität Mainz, 55099 Mainz, Germany, School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia, Unité de Chimie des Matériaux Inorganiques et Organiques, Département de Chimie, Faculté des Sciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium, and ISIS, Rutherford Appleton Laboratory, Chilton, Didcot,
| | - P. Gütlich
- Institut für Anorganische Chemie und Analytische Chemie, Universität Mainz, 55099 Mainz, Germany, School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Australian Defence Force Academy, Canberra, ACT 2600, Australia, Unité de Chimie des Matériaux Inorganiques et Organiques, Département de Chimie, Faculté des Sciences, Université Catholique de Louvain, Place L. Pasteur 1, 1348 Louvain-la-Neuve, Belgium, and ISIS, Rutherford Appleton Laboratory, Chilton, Didcot,
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Ksenofontov V, Reiman S, Waldeck M, Niewa R, Kniep R, Gütlich P. In situ— High Temperature Mössbauer Spectroscopy of Iron Nitrides and Nitridoferrates. Z Anorg Allg Chem 2003. [DOI: 10.1002/zaac.200300135] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Klatyk J, Schnelle W, Wagner FR, Niewa R, Novák P, Kniep R, Waldeck M, Ksenofontov V, Gütlich P. Large orbital moments and internal magnetic fields in lithium nitridoferrate(I). Phys Rev Lett 2002; 88:207202. [PMID: 12005596 DOI: 10.1103/physrevlett.88.207202] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2001] [Indexed: 05/23/2023]
Abstract
The iron nitridometalates Li2[(Li(1-x)Fe(I)(x))N] display ferromagnetic ordering and spin freezing. Large magnetic moments up to 5.0mu(B)/Fe are found in the magnetization. In Mössbauer effect studies huge hyperfine magnetic fields up to 696 kOe are observed at specific Fe sites. These extraordinary fields and moments originate in an unusual ligand field splitting for those Fe species leading [within local spin density approximation (LSDA)] to a localized orbitally degenerate doublet. Including spin-orbit interaction and strong intra-atomic electron correlation (LDA+SO+U) gives rise to a large orbital momentum.
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Affiliation(s)
- J Klatyk
- Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Strasse 40, 01187 Dresden, Germany
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Levchenko G, Ksenofontov V, Stupakov A, Spiering H, Garcia Y, Gütlich P. Pressure effect on temperature induced high-spin–low-spin phase transitions. Chem Phys 2002. [DOI: 10.1016/s0301-0104(01)00707-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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30
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Caneschi A, Dei A, Fabrizi de Biani F, Gütlich P, Ksenofontov V, Levchenko G, Hoefer A, Renz F. Pressure- and temperature-induced valence tautomeric interconversion in a o-dioxolene adduct of a cobalt-tetraazamacrocycle complex. Chemistry 2001; 7:3926-30. [PMID: 11596934 DOI: 10.1002/1521-3765(20010917)7:18<3926::aid-chem3926>3.0.co;2-6] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
An electronic switch at the molecular level has been realized by using a class of ionic compounds of the formula [Co(L)(diox)]Y (L = tetraazamacrocyclic ligand, Y = mononegative anion). Such compounds undergo temperature- and pressure-induced intramolecular one-electron transfer equilibria. The transition temperature of interconversion varies with the nature of the counterions Y (Y = PF6, BPh4, I). Surprisingly the effect of the anion on the transition temperature is not only governed by its volume but also by its coulombic interaction.
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Affiliation(s)
- A Caneschi
- Department of Chemistry, University of Florence, Italy
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31
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Schneider JJ, Engstler J, Franzka S, Hofmann K, Albert B, Ensling J, Gütlich P, Hildebrandt P, Döpner S, Pfleging W, Günther B, Müller G. Carbon nanotube bags: catalytic formation, physical properties, two-dimensional alignment and geometric structuring of densely filled carbon tubes. Chemistry 2001; 7:2888-95. [PMID: 11486965 DOI: 10.1002/1521-3765(20010702)7:13<2888::aid-chem2888>3.0.co;2-h] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The catalytic CVD synthesis, using propyne as carbon precursor and Fe(NO3)3 as catalyst precursor inside porous alumina, gives carbon nanotube (CNT) bags in a well-arranged two-dimensional order. The tubes have the morphology of bags or fibers, since they are completely filled with smaller helicoidal CNTs. This morphology has so far not been reported for CNTs. Owing to the dense filling of the outer mother CNTs with small helicoidal CNTs, the resulting CNT fibers appear to be stiff and show no sign of inflation, as sometimes observed with hollow CNTs. The fiber morphology was observed by raster electron microscopy (REM), transmission electron microscopy (TEM), and atomic force microscopy (AFM). The carbon material is graphitic as deduced from spectroscopic studies (X-ray diffraction, Raman and electron energy-loss spectroscopy (EELS)). From Mössbauer studies, the presence of two different oxidation states (Fe0 and FeIII) of the catalyst is proven. Geometric structuring of the template by two different methods has been studied. Inkjet catalyst printing shows that the tubes can be arranged in defined areas by a simple and easily applied technique. Laser-structuring creates grooves of nanotube fibers embedded in the alumina host. This allows the formation of defined architectures in the microm range. Results on hydrogen absorption and field emission properties of the CNT fibers are reported.
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Affiliation(s)
- J J Schneider
- Institut für Anorganische Chemie der Universität/GH-Essen, Germany.
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32
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Glöckle M, Kaim W, Klein A, Roduner E, Hübner G, Zalis S, van Slageren J, Renz F, Gütlich P. The stable diiron(2.5) complex ion [(NC)(5)Fe(mu-tz)Fe(CN)5](5-), tz = 1,2,4,5-tetrazine, and its neighboring oxidation states. Inorg Chem 2001; 40:2256-62. [PMID: 11327899 DOI: 10.1021/ic001229i] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The conceptually simple mixed-valent diiron compound (NEt(4))(5)[(NC)(5)Fe(mu-tz)Fe(CN)(5)] with the 1,2,4,5-tetrazine (tz) bridging ligand was obtained as a thermally and air-stable material that displays large and highly variable electrochemical comproportionation constants between about 10(8) (in water) and 10(19.0) (in acetonitrile). Strong metal-metal interaction is also evident from spectroscopic results obtained for the solid and for the dissolved species. The rather intense intervalence charge-transfer band occurs around 2400 nm; infrared and Mössbauer spectra reveal the high spectroscopic symmetry of the system according to an (Fe(2.5))(2) formulation. DFT calculations on the [(NC)(5)Fe(mu-tz)Fe(CN)(5)](6-) ion confirm the presence of very low-lying pi(tz) and high-lying d(Fe) orbitals.
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Affiliation(s)
- M Glöckle
- Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany
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Oshio H, Spiering H, Ksenofontov V, Renz F, Gütlich P. Electronic relaxation phenomena following (57)Co(EC)(57)Fe nuclear decay in [Mn(II)(terpy)2](ClO4)2.(1/2)H2O and in the spin crossover complexes [Co(II)(terpy)2]X2.nH2O (X = Cl and ClO4): a Mössbauer emission spectroscopic study. Inorg Chem 2001; 40:1143-50. [PMID: 11300810 DOI: 10.1021/ic000714a] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The valence states of the nucleogenic (57)Fe arising from the nuclear disintegration of radioactive (57)Co by electron capture decay, (57)Co(EC)(57)Fe, have been studied by Mössbauer emission spectroscopy (MES) in the (57)Co-labeled systems: [(57)Co/Co(terpy)(2)]Cl(2).5H(2)O (1), [(57)Co/Co(terpy)(2)](ClO(4))(2).(1)/(2)H(2)O (2), and [(57)Co/Mn(terpy)(2)](ClO(4))(2). (1)/(2)H(2)O (3) (terpy = 2,2':6',2' '-terpyridine). The compounds 1, 2, and 3 were labeled with ca. 1 mCi of (57)Co and were used as the Mössbauer sources at variable temperatures between 300 K and ca. 4 K. [Fe(terpy)(2)]X(2) is a diamagnetic low-spin (LS) complex, independent of the nature of the anion X, while [Co(terpy)(2)]X(2) complexes show gradual spin transition as the temperature is varied. The Co(II) ion in 1 "feels" a somewhat stronger ligand field than that in 2; as a result, 83% of 1 stays in the LS state at 321 K, while in 2 the high-spin (HS) state dominates at 320 K and converts gradually to the LS state with a transition temperature of T(1/2) approximately 180 K. Variable-temperature Mössbauer emission spectra for 1, 2, and 3 showed only LS-(57)Fe(II) species at 295 K. On lowering the temperature, metastable HS Fe(II) species generated by the (57)Co(EC)(57)Fe process start to grow at ca. 100 K in 1, at ca. 200 K in 2, and at ca. 250 K in 3, reaching maximum values of 0.3 at 20 K in 1, 0.8 at 50 K in 2, and 0.86 at 100 K in 3, respectively. The lifetime of the metastable HS states correlates with the local ligand field strength, and this is in line with the "inverse energy gap law" already successfully applied in LIESST relaxation studies.
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Affiliation(s)
- H Oshio
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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Schneider JJ, Czap N, Hagen J, Engstler J, Ensling J, Gütlich P, Reinoehl U, Bertagnolli H, Luis F, de Jongh LJ, Wark M, Grubert G, Hornyak GL, Zanoni R. Metallorganic routes to nanoscale iron and titanium oxide particles encapsulated in mesoporous alumina: formation, physical properties, and chemical reactivity. Chemistry 2000; 6:4305-21. [PMID: 11140960 DOI: 10.1002/1521-3765(20001201)6:23<4305::aid-chem4305>3.0.co;2-n] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Iron and titanium oxide nanoparticles have been synthesized in parallel mesopores of alumina by a novel organometallic "chimie douce" approach that uses bis(toluene)iron(0) (1) and bis(toluene)titanium(0) (2) as precursors. These complexes are molecular sources of iron and titanium in a zerovalent atomic state. In the case of 1, core shell iron/iron oxide particles with a strong magnetic coupling between both components, as revealed by magnetic measurements, are formed. Mössbauer data reveal superparamagnetic particle behavior with a distinct particle size distribution that confirms the magnetic measurements. The dependence of the Mössbauer spectra on temperature and particle size is explained by the influence of superparamagnetic relaxation effects. The coexistence of a paramagnetic doublet and a magnetically split component in the spectra is further explained by a distribution in particle size. From Mössbauer parameters the oxide phase can be identified as low-crystallinity ferrihydrite oxide. In agreement with quantum size effects observed in UV-visible studies, TEM measurements determine the size of the particles in the range 5-8 nm. The particles are mainly arranged alongside the pore walls of the alumina template. TiO2 nanoparticles are formed by depositing 2 in mesoporous alumina template. This produces metallic Ti, which is subsequently oxidized to TiO2 (anatase) within the alumina pores. UV-visible studies show a strong quantum confinement effect for these particles. From UV-visible investigations the particle size is determined to be around 2 nm. XPS analysis of the iron- and titania- embedded nanoparticles reveal the presence of Fe2O3 and TiO2 according to experimental binding energies and the experimental line shapes. Ti4+ and Fe3+ are the only oxidation states of the particles which can be determined by this technique. Hydrogen reduction of the iron/iron-oxide nanoparticles at 500 degrees C under flowing H2/N2 produces a catalyst, which is active towards formation of carbon nanotubes by a CVD process. Depending on the reaction conditions, the formation of smaller carbon nanotubes inside the interior of larger carbon nanotubes within the alumina pores can be achieved. This behavior can be understood by means of selectively turning on and off the iron catalyst by adjusting the flow rate of the gaseous carbon precursor in the CVD process.
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Affiliation(s)
- J J Schneider
- Institut für Chemie, Anorganische Chemie, Karl-Franzens Universität Graz, Austria.
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Schneppensieper T, Liehr G, van Eldik R, Ensling J, Gütlich P. A new cylindrical, six-membered iron(III) inclusion cluster consisting of three oxo-bridged diiron subunits linked by carboxylate bridges. Inorg Chem 2000; 39:5565-8. [PMID: 11154573 DOI: 10.1021/ic000108f] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- T Schneppensieper
- Institut für Anorganische Chemie, Friedrich-Alexander-Universität Erlangen-Nürnberg, Egerlandstrasse 1, 91058 Erlangen, Germany
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Renz F, Oshio H, Ksenofontov V, Waldeck M, Spiering H, Gütlich P. Strong Field Iron(II) Complex Converted by Light into a Long-Lived High-Spin State We are grateful for financial support from the TMR Research Network No. ERB-FMRX-CT98-0199, the Fonds der chemischen Industrie, and the University of Mainz (MWFZ). Angew Chem Int Ed Engl 2000; 39:3699-3700. [PMID: 11091445 DOI: 10.1002/1521-3773(20001016)39:20<3699::aid-anie3699>3.0.co;2-z] [Citation(s) in RCA: 104] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- F Renz
- Institut für Anorganische Chemie und Analytische Chemie Universität Mainz, Staudinger Weg 9, 55099 Mainz (Germany)
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van Koningsbruggen PJ, Garcia Y, Kahn O, Fournès L, Kooijman H, Spek AL, Haasnoot JG, Moscovici J, Provost K, Michalowicz A, Renz F, Gütlich P. Synthesis, crystal structure, EXAFS, and magnetic properties of catena [mu-tris(1,2-bis(tetrazol-1-yl)propane-N1,N1')iron(II)] bis(perchlorate). First crystal structure of an iron(II) spin-crossover chain compound. Inorg Chem 2000; 39:1891-900. [PMID: 11428109 DOI: 10.1021/ic991118n] [Citation(s) in RCA: 144] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[Fe(btzp)3](ClO4)2 (btzp = 1,2-bis(tetrazol-1-yl)propane) represents the first structurally characterized Fe(II) linear chain compound exhibiting thermal spin crossover. It shows a very gradual spin transition (T1/2 = 130 K) which has been followed by magnetic susceptibility measurements and 57Fe Mössbauer spectroscopy. The structure has been solved at 200 and 100 K by single-crystal X-ray analysis. It crystallizes in the trigonal space group P3c1 with Z = 2 Fe(II) units at both temperatures. The molecular structure consists of chains running along the c axis in which the Fe(II) ions are linked by three N4,N4' coordinating bis(tetrazole) ligands. The main difference between the two forms appears to be in the Fe-N bond lengths, which are 2.164(4) A at 200 K and 2.038(4) A at 100 K. The Fe-Fe separations are 7.422(1) A at 200 K and 7.273(1) A at 100 K. The EXAFS results are consistent with the crystal structure. In both spin states, the FeN6 octahedron is almost regular within the EXAFS resolution. The Fe-N distance is found as 2.16(2) A at 300 K and 2.00(2) A at 40 K. The absence of the "7 A peak" in the EXAFS spectra of [Fe(btzp)3](ClO4)2, in contrast with what has been observed for the [Fe(4-R-1,2,4-triazole)3]-(anion)2 chain compounds, confirms that this peak can be used as the signature of a metal alignment only when it involves a strongly enhanced multiple scattering M-M-M path, with M-M spacing less than 4 A. Irradiation with green light at 5 K has led to the population of the metastable high-spin state for the iron(II) ion. The nature of the spin-crossover behavior has been discussed on the basis of the structural features.
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Affiliation(s)
- P J van Koningsbruggen
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg University, Staudingerweg 9, D-55099 Mainz, Germany
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Spiering H, Kohlhaas T, Romstedt H, Hauser A, Bruns-Yilmaz C, Kusz J, Gütlich P. Correlations of the distribution of spin states in spin crossover compounds. Coord Chem Rev 1999. [DOI: 10.1016/s0010-8545(99)00109-5] [Citation(s) in RCA: 95] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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39
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Gütlich P, Range KJ, Felser C, Schultz-Münzenberg C, Tremel W, Walcher D, Waldeck M. The Valence States of Nickel, Tin, and Sulfur in the Ternary Chalcogenide Ni(3)Sn(2)S(2)-XPS, (61)Ni and (119)Sn Mössbauer Investigations, and Band Structure Calculations. Angew Chem Int Ed Engl 1999; 38:2381-2384. [PMID: 10458793 DOI: 10.1002/(sici)1521-3773(19990816)38:16<2381::aid-anie2381>3.0.co;2-l] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The hitherto controversial valence states of nickel and tin in the ternary chalcogenide Ni(3)Sn(2)S(2) (see structure) have been determined by photoelectron and Mössbauer spectroscopy ((61)Ni, (119)Sn). Results from band structure calculations confirmed that this shandite phase is a metal and that the approximate distribution of the valence electrons is (Ni(0))(3)(Sn(1)(II))(Sn(2)(II))(S(II-))(2).
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Affiliation(s)
- P Gütlich
- Institut für Anorganische und Analytische Chemie der Universität, Staudinger Weg 9, D-55099 Mainz (Germany)
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Goga M, Seshadri R, Ksenofontov V, Gütlich P, Tremel W. Ln2Ti2S2O5 (Ln = Nd, Pr, Sm): a novel series of defective Ruddlesden–Popper phases. Chem Commun (Camb) 1999. [DOI: 10.1039/a809737b] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Ksenofontov V, Levchenko G, Spiering H, Gütlich P, Létard JF, Bouhedja Y, Kahn O. Spin crossover behavior under pressure of Fe(PM-L)2(NCS)2 compounds with substituted 2′-pyridylmethylene 4-anilino ligands. Chem Phys Lett 1998. [DOI: 10.1016/s0009-2614(98)00901-4] [Citation(s) in RCA: 108] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Affiliation(s)
| | | | - M. Muhler
- Lehrstuhl für Technische Chemie, Ruhr-Universität Bochum, D-44780 Bochum, Germany
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Buchen T, Gütlich P, Sugiyarto KH, Goodwin HA. High-Spin → Low-Spin Relaxation in [Fe(bpp)2](CF3SO3)2 H2O after LIESST and Thermal Spin-State Trapping—Dynamics of Spin Transition Versus Dynamics of Phase Transition. Chemistry 1996. [DOI: 10.1002/chem.19960020915] [Citation(s) in RCA: 110] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Buchen T, Gütlich P, Toftlund H. Thermal and Light-Induced Spin Transition in [Fe(bpen)X2] (bpen = 1,6-Bis(2-pyridyl)-2,5-diazahexane, X = NCS-, NCSe-). Chemistry 1996. [DOI: 10.1002/chem.19960020914] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Jansen N, Walcher D, Gütlich P, Häußinger D, Hannebauer B, Kniep R, Lutar K, Schmidt PC, Sellmann D, Žemva B. Application of 61Ni Mössbauer spectroscopy to chemical problems. ACTA ACUST UNITED AC 1996. [DOI: 10.1007/bf02458896] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Buchen T, Schollmeyer D, Gütlich P. Thermal and Light-Induced Spin Transition in the High- and Low-Temperature Structure of [Fe(0.35)Ni(0.65)(mtz)(6)](ClO(4))(2). Inorg Chem 1996; 35:155-161. [PMID: 11666178 DOI: 10.1021/ic9504405] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The thermal and light induced spin transition in [Fe(0.35)Ni(0.65)(mtz)(6)](ClO(4))(2) (mtz = 1-methyl-1H-tetrazole) was studied by (57)Fe Mössbauer spectroscopy and magnetic susceptibility measurements. In addition to the spin transition of the iron(II) complexes the compound undergoes a structural phase transition. The high-temperature structure could be determined by X-ray crystallography of the isomorphous [Fe(0.25)Ni(0.75)(mtz)(6)](ClO(4))(2) complex at room temperature. The X-ray structural analysis shows this complex to be rhombohedric, space group R&thremacr;, with a = 10.865(2) Å and c = 23.65(1) Å with three molecules in the unit cell. The transition to the low-temperature structure occurs at approximately 60 K without changing the spin state of the molecules. By subsequent heating of the complex the high-temperature structure is reached again between ca. 170 and 200 K. The spin transition behavior is strongly influenced by the structural changes, and the observed spin transition curves are completely different for the high- and low-temperature phases. In the high-temperature structure a complete and gradual spin transition between 220 and 120 K (T(1/2)(gamma(HS) = 0.5) = 185 K) is detected; the high-spin (HS) state is represented by one HS doublet in the Mössbauer spectra. In the low-temperature structure a two-step transition curve is detected in the heating mode. About 36% of the molecules show a LS (low-spin) --> HS transition between ca 50 and 75 K. Then the HS fraction stays constant up to 150 K. A further increase in the high-spin fraction is observed at temperatures above 150 K. In this structural phase the HS state is represented by two different HS doublets in the Mössbauer spectra. The formation of metastable HS states by making use of the LIESST effect is only possible in the low-temperature structure. By excitation of the LS molecules with green light, two different HS states are populated which show very different relaxation behavior. One HS state shows a relaxation to the LS state even at 10 K; the other HS state shows a very slow HS --> LS relaxation at 60 K (within days), leading to the HS fraction corresponding to the thermal equilibrium value.
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Affiliation(s)
- Th. Buchen
- Institut für Anorganische Chemie und Analytische Chemie, Johannes Gutenberg Universität Mainz, Staudingerweg 9, D-55099 Mainz, Germany
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Deisenroth S, Hauser A, Spiering H, Gütlich P. Time integral and time differential Mössbauer measurements on [57Co/Mn(bipy)3](PF6)2. ACTA ACUST UNITED AC 1994. [DOI: 10.1007/bf02072911] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Yu Z, Schmitt G, Hofmann S, Spiering H, Hsia YF, Gütlich P. Lamb-Mössbauer factor in the spin crossover compound Fe(tpa)(NCS)2. ACTA ACUST UNITED AC 1994. [DOI: 10.1007/bf02072893] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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