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ndltd-OhioLink-oai-etd.ohiolink.edu-osu1343143081
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ndltd-OhioLink-oai-etd.ohiolink.edu-osu13431430812021-08-03T06:06:02Z Dimensionality and disorder in molecule-based magnets Brinckerhoff, William B. <p>The importance of dimensionality and disorder in understanding the magnetic properties of molecule-based magnets is examined through the study of two classes of materials. The V/TCNE/solvent class (TCNE = tetracyanoethylene, solvent = CH2Cl2, THF, or MeCN) includes the first molecule/organic-based compounds that are magnetic at room temperature. Magnetization studies reveal a wide range of behavior consistent with variations in local order and sensitivity to synthetic conditions. In particular, the source of the vanadium cation is found to play a crucial role in determining the final magnetic state. The [MnTPP][TCNE] class (TPP = ,<i>meso</i>-tetraporphyrinato) are crystalline quasi-one-dimensional ferrimagnets with direct metal-TCNE bonds similar to V/TCNE. The parent compound of this class, [MnTPP]::+[TCNE].-•2PhMe, exhibits low-temperature magnetic properties that are novel for a quasi-1D molecular material. A reentrant spin glass phase, metamagnetism, and a broad temperature region of short-range ferrimagnetic order are revealed through studies of magnetization, dynamic and harmonic susceptibility, and specific heat. The results are compared with the expectations of a model of strongly interacting superparamagnetic clusters. The structural anisotropy in [MnTPP][TCNE] is reflected in the high-temperature susceptibility, which is found to deviate significantly from the predictions of current theories of ferrimagnetic chains. The dipole interaction between chains is considered as a viable candidate to explain the long-range order in metal-TCNE chains as well as the lower-temperature glassy behavior in [MnTPP][TCNE].</p> 1995 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1343143081 http://rave.ohiolink.edu/etdc/view?acc_num=osu1343143081 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
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| collection |
NDLTD
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| language |
English
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| sources |
NDLTD
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| author |
Brinckerhoff, William B.
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| spellingShingle |
Brinckerhoff, William B.
Dimensionality and disorder in molecule-based magnets
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| author_facet |
Brinckerhoff, William B.
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| author_sort |
Brinckerhoff, William B.
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| title |
Dimensionality and disorder in molecule-based magnets
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| title_short |
Dimensionality and disorder in molecule-based magnets
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| title_full |
Dimensionality and disorder in molecule-based magnets
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| title_fullStr |
Dimensionality and disorder in molecule-based magnets
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| title_full_unstemmed |
Dimensionality and disorder in molecule-based magnets
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| title_sort |
dimensionality and disorder in molecule-based magnets
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| publisher |
The Ohio State University / OhioLINK
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| publishDate |
1995
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| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1343143081
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| work_keys_str_mv |
AT brinckerhoffwilliamb dimensionalityanddisorderinmoleculebasedmagnets
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| _version_ |
1719430883396550656
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