Understanding Spin Crossover [Elektronische Ressource] : A Contribution / Wolfgang Bauer. Betreuer: Birgit Weber

Wolfgang Bauer

Informations

• Publié par: ludwig-maximilians-universitat_munchen
• Publié le: 01 janvier 2011
• Nombre de lectures: 28
• Langue: Deutsch
• Poids de l'ouvrage: 21 Mo

Extrait

Dissertation zur Erlangung des Doktorgrades
der Fakultät Chemie und Pharmazie
der Ludwig-Maximilians-Universität München









Understanding Spin Crossover: A Contribution











Wolfgang Manfred Bauer
aus
Landsberg am Lech

2011

Erklärung:

Diese Dissertation wurde im Sinne von § 13 Abs. 3 bzw. 4 der Promotionsordnung vom 29.
Januar 1998 (in der Fassung der vierten Änderungssatzung vom 26. November 2004) von
Frau Prof. Dr. Birgit Weber betreut.


Ehrenwörtliche Versicherung:

Diese Dissertation wurde selbständig, ohne unerlaubte Hilfe erarbeitet.



München, 14. April 2011 Wolfgang Bauer




















Dissertation eingereicht am: 14. April 2011

1. Gutachter: Prof. Dr. B. Weber

2. Gutachter: Prof. Dr. D. Johrendt

Mündliche Prüfung am: 27. Mai 2011



































Wenn du ein Problem hast, versuche es zu lösen.
Kannst du es nicht lösen, dann mache kein Problem daraus.

SIDDHARTHA GAUTAMA







Contents



Contents
Contents.................................................................................................................................. I
Abbreviations .......................................................................................................................III
1 Introduction ................................................................................................................... 1
1.1 Thermal Spin Transition........................................................................................ 2
1.2 Theoretical Aspects of the Spin Crossover ........................................................... 4
1.3 Detecting the Spin Crossover................................................................................ 7
2 Summary ....................................................................................................................... 9
2.1 The Ligand System................................................................................................ 9
2.2 The Purposeful Design of Stepwise Spin Transitions......................................... 11
2.3 Spin Transitions in Solution................................................................................ 14
2.4 The Crystal Contact Index................................................................................... 15
2.5 The Solvent Effect............................................................................................... 15
2.6 A New Model for the Explanation of Wide Hysteresis Loops ........................... 17
2.7 Synthesis of SCO Compounds in a Crystal Engineering-like Approach ............ 19
2.8 References ........................................................................................................... 21
3 Individual Contribution to Joint Publication............................................................... 27
4 Two-Step versus One-Step Spin Transition in Iron(II) 1D Chain Compounds .......... 33
4.1 Introduction ......................................................................................................... 34
4.2 Results ................................................................................................................. 38
4.3 Discussion ........................................................................................................... 59
4.4 Conclusion........................................................................................................... 61
4.5 Experimental Section .......................................................................................... 62
4.6 References ........................................................................................................... 66
4.7 Supporting Information....................................................................................... 70
5 X-Ray Structure and Magnetic Properties of Dinuclear and Polymer Iron(II)
Complexes................................................................................................................... 75
5.1 Introduction ......................................................................................................... 76
5.2 Results and Discussion........................................................................................ 78
5.3 Conclusion........................................................................................................... 85
5.4 Experimental Section .......................................................................................... 86
5.5 References ........................................................................................................... 89
5.6 Supporting Information....................................................................................... 91
6 X-Ray Structure and Magnetic Properties of Two New Iron(II) 1D Coordination
Polymers with Bis(imidazolyle)-methane as Bridging Ligand................................... 95
6.1 Introduction ......................................................................................................... 95
6.2 Results and Discussion........................................................................................ 97
6.3 Conclusion......................................................................................................... 102
6.4 Experimental Section ........................................................................................ 103
6.5 References ......................................................................................................... 105
6.6 Supporting Information..................................................................................... 108
7 Complete and Incomplete Spin Transitions in 1D Chain Iron(II) Compounds ........ 111
7.1 Introduction ....................................................................................................... 112
7.2 Results and Discussion...................................................................................... 113
7.3 Conclusion......................................................................................................... 129
7.4 Experimental Section ........................................................................................ 130
7.5 References ..........................................................................................................132
I Contents



7.6 Supporting Information..................................................................................... 136
8 A Promising New Schiff Base-like Ligand for the Synthesis of Octahedral Iron(II)
Spin Crossover Complexes ....................................................................................... 139
8.1 Introduction ....................................................................................................... 139
8.2 Results and Discussion...................................................................................... 140
8.3 Conclusion......................................................................................................... 146
8.4 Experimental Section ........................................................................................ 147
8.5 References ......................................................................................................... 149
8.6 Supporting Information..................................................................................... 151
9 Complete Two-Step Spin-Transition in a 1D Chain Iron(II) Complex with 110 K
Wide Intermediate Plateau ........................................................................................ 153
9.1 Introduction ....................................................................................................... 154
9.2 Results ............................................................................................................... 156
9.3 Discussion ......................................................................................................... 170
9.4 Conclusion......................................................................................................... 171
9.5 Experimental Section ........................................................................................ 172
9.6 References ......................................................................................................... 175
9.7 Supporting Information..................................................................................... 179
10 Influence of Hydrogen Bonding on the Hysteresis Width in Iron(II) Spin Crossover
Complexes................................................................................................................. 181
10.1 Introduction .............................................................