{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/25604"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/25604","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Vibrational and thermodynamic properties of ferrocene","abstract":"The vibrational and thermodynamic properties of crystalline ferrocene (dicyclopentadienyl iron, Fe(CH)2' Fc), and dilute soluSStions of Fc in the liq-uid crystals 4-n-hexyloxybenzylidene 4'-npropylaniline (HBPA) and terephthal-bis-butylaniline (TBBA) have been studied using Mossbauer spectroscopy. The recoil free fraction (rff) of the S7Fe resonance of crystalline Fc and deuterated Fc has been measured from 4 to 300K. Anharmonic effects are found to be important in crystalline Fe, and a model is presented to account for these effects. Fc undergoes a structural phase transition (T l63.9K for Fc, T = 203.7K for deuterated Fc). The large shift o 0 in T for deuterated Fc can be attributed to a change in the molecular o barrier to rotation of the CSHS rings about the S-fold symmetry axis. Solutions of Fc in the two liquid crystals showed similar behavior of the rff. The rff of Fc in crystalline TBBA shows an anomalous drop starting about SO degrees below the crystal-smetic H transition (ll3C). The resonance becomes unobservable just below (-2 degrees) the transition temperature. The smectic phase of HBPA is known to supercool. Ferrocene in supercooled HBPA shows an anomalous drop in rff similar to that observed in TBBA. In this case, however, the Nossbauer resonance can be observed above the crystalsmectic H transition temperature (29C). The anomalous drop in rff begins near OC and the resonance disappears near SSC. The anomalous drop in rff for ferrocene in HBPA is accompanied by broadening of the Fc Mossbauer resonance. Similar behavior of rff and linewidth has been observed in glasses and supercooled liquids.","abstract_html":"The vibrational and thermodynamic properties of crystalline ferrocene (dicyclopentadienyl iron, Fe(CH)2' Fc), and dilute soluSStions of Fc in the liq-uid crystals 4-n-hexyloxybenzylidene 4'-npropylaniline (HBPA) and terephthal-bis-butylaniline (TBBA) have been studied using Mossbauer spectroscopy. The recoil free fraction (rff) of the S7Fe resonance of crystalline Fc and deuterated Fc has been measured from 4 to 300K. Anharmonic effects are found to be important in crystalline Fe, and a model is presented to account for these effects. Fc undergoes a structural phase transition (T l63.9K for Fc, T = 203.7K for deuterated Fc). The large shift o 0 in T for deuterated Fc can be attributed to a change in the molecular o barrier to rotation of the CSHS rings about the S-fold symmetry axis. Solutions of Fc in the two liquid crystals showed similar behavior of the rff. The rff of Fc in crystalline TBBA shows an anomalous drop starting about SO degrees below the crystal-smetic H transition (ll3C). The resonance becomes unobservable just below (-2 degrees) the transition temperature. The smectic phase of HBPA is known to supercool. Ferrocene in supercooled HBPA shows an anomalous drop in rff similar to that observed in TBBA. In this case, however, the Nossbauer resonance can be observed above the crystalsmectic H transition temperature (29C). The anomalous drop in rff begins near OC and the resonance disappears near SSC. The anomalous drop in rff for ferrocene in HBPA is accompanied by broadening of the Fc Mossbauer resonance. Similar behavior of rff and linewidth has been observed in glasses and supercooled liquids.","abstract_has_math":false,"creators":["Hill, C. Ray"],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Debrunner, Peter G."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-06-30T17:04:48Z","date_published":"2011-06-30T17:04:48Z","updated_at":"2026-07-22T22:25:24Z","subjects":["vibrationaly properties","thermodynamic properties","ferrocene","cystalline ferrocene","Mossbauer spectroscopy"],"languages":["en"],"rights":["1978 C. Ray Hill"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["312043"],"render_values":[{"text":"312043","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/25604","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Debrunner, Peter G."]},{"key":"dc:creator","label":"Author","values":["Hill, C. 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Ray Hill"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["312043","http://hdl.handle.net/2142/25604"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The vibrational and thermodynamic properties of crystalline ferrocene (dicyclopentadienyl iron, Fe(CH)2' Fc), and dilute soluSStions of Fc in the liq-uid crystals 4-n-hexyloxybenzylidene 4'-npropylaniline (HBPA) and terephthal-bis-butylaniline (TBBA) have been studied using Mossbauer spectroscopy. The recoil free fraction (rff) of the S7Fe resonance of crystalline Fc and deuterated Fc has been measured from 4 to 300K. Anharmonic effects are found to be important in crystalline Fe, and a model is presented to account for these effects. Fc undergoes a structural phase transition (T l63.9K for Fc, T = 203.7K for deuterated Fc). The large shift o 0 in T for deuterated Fc can be attributed to a change in the molecular o barrier to rotation of the CSHS rings about the S-fold symmetry axis. Solutions of Fc in the two liquid crystals showed similar behavior of the rff. The rff of Fc in crystalline TBBA shows an anomalous drop starting about SO degrees below the crystal-smetic H transition (ll3C). The resonance becomes unobservable just below (-2 degrees) the transition temperature. The smectic phase of HBPA is known to supercool. Ferrocene in supercooled HBPA shows an anomalous drop in rff similar to that observed in TBBA. In this case, however, the Nossbauer resonance can be observed above the crystalsmectic H transition temperature (29C). The anomalous drop in rff begins near OC and the resonance disappears near SSC. The anomalous drop in rff for ferrocene in HBPA is accompanied by broadening of the Fc Mossbauer resonance. Similar behavior of rff and linewidth has been observed in glasses and supercooled liquids.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-30T17:04:48Z No. of bitstreams: 1 1978_hill.pdf: 2445526 bytes, checksum: 6375ad0ff39bb059847177e96df4cc88 (MD5)","Made available in DSpace on 2011-06-30T17:04:48Z (GMT). No. of bitstreams: 1 1978_hill.pdf: 2445526 bytes, checksum: 6375ad0ff39bb059847177e96df4cc88 (MD5) Previous issue date: 1978","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-30T17:04:48Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:32:30-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"]},{"key":"dc:title","label":"Title","values":["Vibrational and thermodynamic properties of ferrocene"]}]}],"canonical_facts":{"dc:contributor":["Debrunner, Peter G."],"dc:creator":["Hill, C. Ray"],"dc:date":["2011-06-30T17:04:48Z","10000-01-01","1978"],"dc:description":["The vibrational and thermodynamic properties of crystalline ferrocene (dicyclopentadienyl iron, Fe(CH)2' Fc), and dilute soluSStions of Fc in the liq-uid crystals 4-n-hexyloxybenzylidene 4'-npropylaniline (HBPA) and terephthal-bis-butylaniline (TBBA) have been studied using Mossbauer spectroscopy. The recoil free fraction (rff) of the S7Fe resonance of crystalline Fc and deuterated Fc has been measured from 4 to 300K. Anharmonic effects are found to be important in crystalline Fe, and a model is presented to account for these effects. Fc undergoes a structural phase transition (T l63.9K for Fc, T = 203.7K for deuterated Fc). The large shift o 0 in T for deuterated Fc can be attributed to a change in the molecular o barrier to rotation of the CSHS rings about the S-fold symmetry axis. Solutions of Fc in the two liquid crystals showed similar behavior of the rff. The rff of Fc in crystalline TBBA shows an anomalous drop starting about SO degrees below the crystal-smetic H transition (ll3C). The resonance becomes unobservable just below (-2 degrees) the transition temperature. The smectic phase of HBPA is known to supercool. Ferrocene in supercooled HBPA shows an anomalous drop in rff similar to that observed in TBBA. In this case, however, the Nossbauer resonance can be observed above the crystalsmectic H transition temperature (29C). The anomalous drop in rff begins near OC and the resonance disappears near SSC. The anomalous drop in rff for ferrocene in HBPA is accompanied by broadening of the Fc Mossbauer resonance. Similar behavior of rff and linewidth has been observed in glasses and supercooled liquids.","Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-30T17:04:48Z No. of bitstreams: 1 1978_hill.pdf: 2445526 bytes, checksum: 6375ad0ff39bb059847177e96df4cc88 (MD5)","Made available in DSpace on 2011-06-30T17:04:48Z (GMT). No. of bitstreams: 1 1978_hill.pdf: 2445526 bytes, checksum: 6375ad0ff39bb059847177e96df4cc88 (MD5) Previous issue date: 1978","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-06-30T17:04:48Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:32:30-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis","Thesis","U of I Only"],"dc:identifier":["312043","http://hdl.handle.net/2142/25604"],"dc:language":["en"],"dc:rights":["1978 C. Ray Hill"],"dc:subject":["vibrationaly properties","thermodynamic properties","ferrocene","cystalline ferrocene","Mossbauer spectroscopy"],"dc:title":["Vibrational and thermodynamic properties of ferrocene"],"dc:type":["Dissertation / Thesis","text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-22T22:25:24Z"}