{"id":{"repo_id":"windsor","oai_identifier":"oai:uwindsor.scholaris.ca:20.500.14776/1558"},"canonical_url":"https://search.dev.ndltd.org/etd/windsor/oai:uwindsor.scholaris.ca:20.500.14776/1558","repository":{"repo_id":"windsor","name":"University of Windsor","base_url":"https://uwindsor.scholaris.ca/server/oai/request"},"display":{"title":"ESR studies of some iron(II) spin crossover complexes.","abstract":"X-band ESR powder studies have been done on the spin transition in Mn 2- doped [Fe(bpp)2][CF3SO3] 2·H2O, [Fe(bpp)2][BF4] 2 and [Fe(5NO2-sal N(1,4,7,10))] complexes. The use of Mn 2+ as an ESR probe in the studies is based on the knowledge that the ion is very sensitive to changes in its surrounding environment, enabling the changes within the system during HS ↔ LS crossover to be observed. The computer simulations of the powder ESR spectra of Mn2+ ion in these complexes using the SimFonia simulation program, obtained from Broker, gave numerical values of D and E for Mn2+ in the [Fe(bpp)2][CF3SO 3]2·H2O and [Fe(bpp)2][BF 4]2 systems. The magnitudes of D for Mn2+ ion are very different in the HS and LS phases of both the [Fe(bPP)2 ][CF3SO3]2·H2O and [Fe(bpp)2][BF4]2 systems, indicating that the spin transition in these systems is accompanied by a phase transformation. The spears show that during the transition there are separate domains for each spin state. Attempts to simulate the powder ESR spew of Mn2+ in [Fe(5-NO2-sal-N(1,4,7,10))] complex were unsuccessful owing to their poor quality, and further ESR study of this system was not pursued. In summary, ESR studies of [Fe(bpp)2][CF3SO 3]2·H2O show that the phase transformation is coupled to the thermally-induced spin crossover, whereas in [Fe(bpp) 2][BF4]2 the phase transformation takes place first. The rate of HS → LS phase transformation in the [Fe(bpp) 2][CF3SO3]2·H2O system, when the HS state is formed by rapidly cooling the HS state, is the same as the HS → LS conversion reported in the literature using magnetic susceptibility measurements. The rate of HS → LS phase transformation in the [Fe(bpp) 2][BF4]2 system, when the HS state is formed by rapidly cooling the HS state, is twice the rate of the spin-state transition reported in the literature using Mossbauer spectroscopy. There is also no evidence of a phase change seen in the ESR spectra of the [Fe(5-NO2-sal-N(1,4,7,10))] complex. (Abstract shortened by UMI.) Source: Dissertation Abstracts International, Volume: 61-09, Section: B, page: 4745. Adviser: Bruce R. McGarvey. Thesis (Ph.D.)--University of Windsor (Canada), 1998.","abstract_html":"X-band ESR powder studies have been done on the spin transition in Mn 2- doped [Fe(bpp)2][CF3SO3] 2·H2O, [Fe(bpp)2][BF4] 2 and [Fe(5NO2-sal N(1,4,7,10))] complexes. The use of Mn 2+ as an ESR probe in the studies is based on the knowledge that the ion is very sensitive to changes in its surrounding environment, enabling the changes within the system during HS ↔ LS crossover to be observed. The computer simulations of the powder ESR spectra of Mn2+ ion in these complexes using the SimFonia simulation program, obtained from Broker, gave numerical values of D and E for Mn2+ in the [Fe(bpp)2][CF3SO 3]2·H2O and [Fe(bpp)2][BF 4]2 systems. The magnitudes of D for Mn2+ ion are very different in the HS and LS phases of both the [Fe(bPP)2 ][CF3SO3]2·H2O and [Fe(bpp)2][BF4]2 systems, indicating that the spin transition in these systems is accompanied by a phase transformation. The spears show that during the transition there are separate domains for each spin state. Attempts to simulate the powder ESR spew of Mn2+ in [Fe(5-NO2-sal-N(1,4,7,10))] complex were unsuccessful owing to their poor quality, and further ESR study of this system was not pursued. In summary, ESR studies of [Fe(bpp)2][CF3SO 3]2·H2O show that the phase transformation is coupled to the thermally-induced spin crossover, whereas in [Fe(bpp) 2][BF4]2 the phase transformation takes place first. The rate of HS → LS phase transformation in the [Fe(bpp) 2][CF3SO3]2·H2O system, when the HS state is formed by rapidly cooling the HS state, is the same as the HS → LS conversion reported in the literature using magnetic susceptibility measurements. The rate of HS → LS phase transformation in the [Fe(bpp) 2][BF4]2 system, when the HS state is formed by rapidly cooling the HS state, is twice the rate of the spin-state transition reported in the literature using Mossbauer spectroscopy. There is also no evidence of a phase change seen in the ESR spectra of the [Fe(5-NO2-sal-N(1,4,7,10))] complex. (Abstract shortened by UMI.) Source: Dissertation Abstracts International, Volume: 61-09, Section: B, page: 4745. Adviser: Bruce R. McGarvey. Thesis (Ph.D.)--University of Windsor (Canada), 1998.","abstract_has_math":false,"creators":["Sung, Raymond Chi Wai."],"institution":"University of Windsor","degree_name":"Ph.D.","degree_level":"Doctoral","degree_discipline":"Chemistry and Biochemistry","degree_department":null,"school":null,"contributors":[],"advisors":["McGarvey, Bruce R.,"],"committee_chairs":[],"committee_members":[],"year":1998,"date_issued":"1998-01-01","date_published":"1998-01-01","updated_at":"2026-07-27T22:04:39Z","subjects":[],"languages":["en_CA"],"rights":[],"rights_urls":["http://creativecommons.org/licenses/by-nc-nd/4.0/"],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/20.500.14776/1558","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["McGarvey, Bruce R.,"]},{"key":"dc:creator","label":"Author","values":["Sung, Raymond Chi Wai."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-06-12 11:23"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2013-03-20 8:02","2025-06-12T15:23:28Z"]},{"key":"dc:date.issued","label":"Date","values":["1998-01-01"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemistry and Biochemistry"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Doctoral"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Windsor"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_CA"]},{"key":"dc:rights","label":"Dc Rights","values":["http://creativecommons.org/licenses/by-nc-nd/4.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/20.500.14776/1558"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["X-band ESR powder studies have been done on the spin transition in Mn 2- doped [Fe(bpp)2][CF3SO3] 2·H2O, [Fe(bpp)2][BF4] 2 and [Fe(5NO2-sal N(1,4,7,10))] complexes. The use of Mn 2+ as an ESR probe in the studies is based on the knowledge that the ion is very sensitive to changes in its surrounding environment, enabling the changes within the system during HS ↔ LS crossover to be observed. The computer simulations of the powder ESR spectra of Mn2+ ion in these complexes using the SimFonia simulation program, obtained from Broker, gave numerical values of D and E for Mn2+ in the [Fe(bpp)2][CF3SO 3]2·H2O and [Fe(bpp)2][BF 4]2 systems. The magnitudes of D for Mn2+ ion are very different in the HS and LS phases of both the [Fe(bPP)2 ][CF3SO3]2·H2O and [Fe(bpp)2][BF4]2 systems, indicating that the spin transition in these systems is accompanied by a phase transformation. The spears show that during the transition there are separate domains for each spin state. Attempts to simulate the powder ESR spew of Mn2+ in [Fe(5-NO2-sal-N(1,4,7,10))] complex were unsuccessful owing to their poor quality, and further ESR study of this system was not pursued. In summary, ESR studies of [Fe(bpp)2][CF3SO 3]2·H2O show that the phase transformation is coupled to the thermally-induced spin crossover, whereas in [Fe(bpp) 2][BF4]2 the phase transformation takes place first. The rate of HS → LS phase transformation in the [Fe(bpp) 2][CF3SO3]2·H2O system, when the HS state is formed by rapidly cooling the HS state, is the same as the HS → LS conversion reported in the literature using magnetic susceptibility measurements. The rate of HS → LS phase transformation in the [Fe(bpp) 2][BF4]2 system, when the HS state is formed by rapidly cooling the HS state, is twice the rate of the spin-state transition reported in the literature using Mossbauer spectroscopy. There is also no evidence of a phase change seen in the ESR spectra of the [Fe(5-NO2-sal-N(1,4,7,10))] complex. (Abstract shortened by UMI.) Source: Dissertation Abstracts International, Volume: 61-09, Section: B, page: 4745. Adviser: Bruce R. McGarvey. Thesis (Ph.D.)--University of Windsor (Canada), 1998."]},{"key":"dc:title","label":"Title","values":["ESR studies of some iron(II) spin crossover complexes."]}]}],"canonical_facts":{"dc:contributor.advisor":["McGarvey, Bruce R.,"],"dc:creator":["Sung, Raymond Chi Wai."],"dc:date.accessioned":["2025-06-12 11:23"],"dc:date.available":["2013-03-20 8:02","2025-06-12T15:23:28Z"],"dc:date.issued":["1998-01-01"],"dc:description.abstract":["X-band ESR powder studies have been done on the spin transition in Mn 2- doped [Fe(bpp)2][CF3SO3] 2·H2O, [Fe(bpp)2][BF4] 2 and [Fe(5NO2-sal N(1,4,7,10))] complexes. The use of Mn 2+ as an ESR probe in the studies is based on the knowledge that the ion is very sensitive to changes in its surrounding environment, enabling the changes within the system during HS ↔ LS crossover to be observed. The computer simulations of the powder ESR spectra of Mn2+ ion in these complexes using the SimFonia simulation program, obtained from Broker, gave numerical values of D and E for Mn2+ in the [Fe(bpp)2][CF3SO 3]2·H2O and [Fe(bpp)2][BF 4]2 systems. The magnitudes of D for Mn2+ ion are very different in the HS and LS phases of both the [Fe(bPP)2 ][CF3SO3]2·H2O and [Fe(bpp)2][BF4]2 systems, indicating that the spin transition in these systems is accompanied by a phase transformation. The spears show that during the transition there are separate domains for each spin state. Attempts to simulate the powder ESR spew of Mn2+ in [Fe(5-NO2-sal-N(1,4,7,10))] complex were unsuccessful owing to their poor quality, and further ESR study of this system was not pursued. In summary, ESR studies of [Fe(bpp)2][CF3SO 3]2·H2O show that the phase transformation is coupled to the thermally-induced spin crossover, whereas in [Fe(bpp) 2][BF4]2 the phase transformation takes place first. The rate of HS → LS phase transformation in the [Fe(bpp) 2][CF3SO3]2·H2O system, when the HS state is formed by rapidly cooling the HS state, is the same as the HS → LS conversion reported in the literature using magnetic susceptibility measurements. The rate of HS → LS phase transformation in the [Fe(bpp) 2][BF4]2 system, when the HS state is formed by rapidly cooling the HS state, is twice the rate of the spin-state transition reported in the literature using Mossbauer spectroscopy. There is also no evidence of a phase change seen in the ESR spectra of the [Fe(5-NO2-sal-N(1,4,7,10))] complex. (Abstract shortened by UMI.) Source: Dissertation Abstracts International, Volume: 61-09, Section: B, page: 4745. Adviser: Bruce R. McGarvey. Thesis (Ph.D.)--University of Windsor (Canada), 1998."],"dc:identifier.uri":["https://hdl.handle.net/20.500.14776/1558"],"dc:language.iso":["en_CA"],"dc:rights":["http://creativecommons.org/licenses/by-nc-nd/4.0/"],"dc:title":["ESR studies of some iron(II) spin crossover complexes."],"dc:type":["text"],"thesis:degree_discipline":["Chemistry and Biochemistry"],"thesis:degree_level":["Doctoral"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Windsor"]},"updated_at":"2026-07-27T22:04:39Z"}