The preparation, characterization, and reactivity of a series of ([eta][superscript]2-alkyne)(meso-tetratolylporphyrinato)titanium(II) complexes are described. Also described are intermetal oxygen atom transfer reactions involving titanium(IV) and titanium(III) porphyrin complexes. The [eta][superscript]2-alkyne complexes, (TTP)Ti([eta][superscript]2-R-C≡C-R[superscript]') (where R = R[superscript]' = Me, Et, Ph; R = Me, R[superscript]' = Et), are prepared by treatment of (TTP)TiCl[subscript]2 with LiAlH[subscript]4 in the presence of the alkyne. The structure of (OEP)Ti([eta][superscript]2-Ph-C≡C-Ph) (OEP = octaethylporphryin) was determined by a single-crystal X-ray diffraction. The complex crystallizes in a monoclinic space group C2/c with a = 49.369(7) A, b = 13.734(9) A, c = 36.042(4) A, [beta] = 136.622(7)°, V = 16784(9) A[superscript]3, Z = 16, R = 0.060, R[subscript] w =.062. These compounds undergo simple substitution to displace the alkyne and produce doubly substituted complexes. Where R = R[superscript]' = Et or Me, the coordinated internal alkyne is displaced by a terminal alkyne, R[superscript]''-C≡C-H (R[superscript]'' = Ph, H). The structure of (TTP)Ti(4-picoline)[subscript]2 was determined by single-crystal X-ray diffraction. The complex crystallizes in the triclinic space group P1 with a = 9.764(2) A, b = 10.899(2) A, c = 13.530(2) A, [alpha] = 92.18(2), [beta] = 98.10(2)°, [gamma] = 114.14(2)°, V = 1293.6(4) A, Z = 1, R =.0517, R[subscript] w =.0542. The [eta][superscript]2-alkynes undergo redox reaction with diazo reagents and phosphine chalcogenides. They also abstract a chalcogenide from (TTP)Ti([eta][superscript]2-Ch[subscript]2) where Ch = O, S, Se;Treatment of (TTP)Ti=O with (OEP)Ti-Cl yields intermetal O/Cl exchange. This is formally a one electron redox process mediated by oxygen atom transfer. The equilibrium and forward rate constants at 20°C were determined to be 1.6 ± 0.4 and 2.4 ± 0.3 x 10[superscript]2 M[superscript]-1s[superscript]-1, respectively. Studies were performed to determine temperature, axial ligand, and solvent dependencies. Also, a zero-electron redox process mediated by atom transfer is observed when (TTP)TiCl[subscript]2 is treated with (OEP)Ti=O. The equilibrium constant was determined to be 47 ± 13 at 20°C. The forward rate constant was found to be 5 ± 1 at 20°C. Rate constants at various temperatures were determined to examine temperature dependence.
","abstract_html":"<p>The preparation, characterization, and reactivity of a series of ([eta][superscript]2-alkyne)(meso-tetratolylporphyrinato)titanium(II) complexes are described. Also described are intermetal oxygen atom transfer reactions involving titanium(IV) and titanium(III) porphyrin complexes. The [eta][superscript]2-alkyne complexes, (TTP)Ti([eta][superscript]2-R-C≡C-R[superscript]') (where R = R[superscript]' = Me, Et, Ph; R = Me, R[superscript]' = Et), are prepared by treatment of (TTP)TiCl[subscript]2 with LiAlH[subscript]4 in the presence of the alkyne. The structure of (OEP)Ti([eta][superscript]2-Ph-C≡C-Ph) (OEP = octaethylporphryin) was determined by a single-crystal X-ray diffraction. The complex crystallizes in a monoclinic space group C2/c with a = 49.369(7) A, b = 13.734(9) A, c = 36.042(4) A, [beta] = 136.622(7)°, V = 16784(9) A[superscript]3, Z = 16, R = 0.060, R[subscript] w =.062. These compounds undergo simple substitution to displace the alkyne and produce doubly substituted complexes. Where R = R[superscript]' = Et or Me, the coordinated internal alkyne is displaced by a terminal alkyne, R[superscript]''-C≡C-H (R[superscript]'' = Ph, H). The structure of (TTP)Ti(4-picoline)[subscript]2 was determined by single-crystal X-ray diffraction. The complex crystallizes in the triclinic space group P1 with a = 9.764(2) A, b = 10.899(2) A, c = 13.530(2) A, [alpha] = 92.18(2), [beta] = 98.10(2)°, [gamma] = 114.14(2)°, V = 1293.6(4) A, Z = 1, R =.0517, R[subscript] w =.0542. The [eta][superscript]2-alkynes undergo redox reaction with diazo reagents and phosphine chalcogenides. They also abstract a chalcogenide from (TTP)Ti([eta][superscript]2-Ch[subscript]2) where Ch = O, S, Se;Treatment of (TTP)Ti=O with (OEP)Ti-Cl yields intermetal O/Cl exchange. This is formally a one electron redox process mediated by oxygen atom transfer. The equilibrium and forward rate constants at 20°C were determined to be 1.6 ± 0.4 and 2.4 ± 0.3 x 10[superscript]2 M[superscript]-1s[superscript]-1, respectively. Studies were performed to determine temperature, axial ligand, and solvent dependencies. Also, a zero-electron redox process mediated by atom transfer is observed when (TTP)TiCl[subscript]2 is treated with (OEP)Ti=O. The equilibrium constant was determined to be 47 ± 13 at 20°C. The forward rate constant was found to be 5 ± 1 at 20°C. Rate constants at various temperatures were determined to examine temperature dependence.</p>","abstract_has_math":false,"creators":["Hays, James"],"institution":null,"degree_name":"Doctor of Philosophy","degree_level":"dissertation","degree_discipline":null,"degree_department":"Department of Chemistry","school":null,"contributors":[],"advisors":["L. Keith Woo"],"committee_chairs":[],"committee_members":[],"year":1993,"date_issued":"1993","date_published":"1993","updated_at":"2026-07-24T02:37:38Z","subjects":[],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.doi","label":"DOI","values":["https://doi.org/10.31274/rtd-180813-11882"],"render_values":[{"text":"https://doi.org/10.31274/rtd-180813-11882","href":"https://doi.org/10.31274/rtd-180813-11882","code":true}]},{"key":"dc:identifier","label":"Identifier","values":["archive/lib.dr.iastate.edu/rtd/10444/"],"render_values":[{"text":"archive/lib.dr.iastate.edu/rtd/10444/","href":null,"code":true}]}]},"links":{"outbound_url":"https://dr.lib.iastate.edu/handle/20.500.12876/63591","outbound_label":"Repository record","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["L. 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Also described are intermetal oxygen atom transfer reactions involving titanium(IV) and titanium(III) porphyrin complexes. The [eta][superscript]2-alkyne complexes, (TTP)Ti([eta][superscript]2-R-C≡C-R[superscript]') (where R = R[superscript]' = Me, Et, Ph; R = Me, R[superscript]' = Et), are prepared by treatment of (TTP)TiCl[subscript]2 with LiAlH[subscript]4 in the presence of the alkyne. The structure of (OEP)Ti([eta][superscript]2-Ph-C≡C-Ph) (OEP = octaethylporphryin) was determined by a single-crystal X-ray diffraction. The complex crystallizes in a monoclinic space group C2/c with a = 49.369(7) A, b = 13.734(9) A, c = 36.042(4) A, [beta] = 136.622(7)°, V = 16784(9) A[superscript]3, Z = 16, R = 0.060, R[subscript] w =.062. These compounds undergo simple substitution to displace the alkyne and produce doubly substituted complexes. Where R = R[superscript]' = Et or Me, the coordinated internal alkyne is displaced by a terminal alkyne, R[superscript]''-C≡C-H (R[superscript]'' = Ph, H). The structure of (TTP)Ti(4-picoline)[subscript]2 was determined by single-crystal X-ray diffraction. The complex crystallizes in the triclinic space group P1 with a = 9.764(2) A, b = 10.899(2) A, c = 13.530(2) A, [alpha] = 92.18(2), [beta] = 98.10(2)°, [gamma] = 114.14(2)°, V = 1293.6(4) A, Z = 1, R =.0517, R[subscript] w =.0542. The [eta][superscript]2-alkynes undergo redox reaction with diazo reagents and phosphine chalcogenides. They also abstract a chalcogenide from (TTP)Ti([eta][superscript]2-Ch[subscript]2) where Ch = O, S, Se;Treatment of (TTP)Ti=O with (OEP)Ti-Cl yields intermetal O/Cl exchange. This is formally a one electron redox process mediated by oxygen atom transfer. The equilibrium and forward rate constants at 20°C were determined to be 1.6 ± 0.4 and 2.4 ± 0.3 x 10[superscript]2 M[superscript]-1s[superscript]-1, respectively. Studies were performed to determine temperature, axial ligand, and solvent dependencies. Also, a zero-electron redox process mediated by atom transfer is observed when (TTP)TiCl[subscript]2 is treated with (OEP)Ti=O. The equilibrium constant was determined to be 47 ± 13 at 20°C. The forward rate constant was found to be 5 ± 1 at 20°C. Rate constants at various temperatures were determined to examine temperature dependence.
"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["The coordination and atom transfer chemistry of titanium porphyrin complexes"]}]}],"canonical_facts":{"dc:contributor.advisor":["L. Keith Woo"],"dc:contributor.department":["Department of Chemistry"],"dc:creator":["Hays, James"],"dc:date":["2018-08-23T08:11:14.000"],"dc:date.accessioned":["2020-06-30T07:04:53Z"],"dc:date.available":["2020-06-30T07:04:53Z"],"dc:date.issued":["1993"],"dc:description.abstract":["The preparation, characterization, and reactivity of a series of ([eta][superscript]2-alkyne)(meso-tetratolylporphyrinato)titanium(II) complexes are described. Also described are intermetal oxygen atom transfer reactions involving titanium(IV) and titanium(III) porphyrin complexes. The [eta][superscript]2-alkyne complexes, (TTP)Ti([eta][superscript]2-R-C≡C-R[superscript]') (where R = R[superscript]' = Me, Et, Ph; R = Me, R[superscript]' = Et), are prepared by treatment of (TTP)TiCl[subscript]2 with LiAlH[subscript]4 in the presence of the alkyne. The structure of (OEP)Ti([eta][superscript]2-Ph-C≡C-Ph) (OEP = octaethylporphryin) was determined by a single-crystal X-ray diffraction. The complex crystallizes in a monoclinic space group C2/c with a = 49.369(7) A, b = 13.734(9) A, c = 36.042(4) A, [beta] = 136.622(7)°, V = 16784(9) A[superscript]3, Z = 16, R = 0.060, R[subscript] w =.062. These compounds undergo simple substitution to displace the alkyne and produce doubly substituted complexes. Where R = R[superscript]' = Et or Me, the coordinated internal alkyne is displaced by a terminal alkyne, R[superscript]''-C≡C-H (R[superscript]'' = Ph, H). The structure of (TTP)Ti(4-picoline)[subscript]2 was determined by single-crystal X-ray diffraction. The complex crystallizes in the triclinic space group P1 with a = 9.764(2) A, b = 10.899(2) A, c = 13.530(2) A, [alpha] = 92.18(2), [beta] = 98.10(2)°, [gamma] = 114.14(2)°, V = 1293.6(4) A, Z = 1, R =.0517, R[subscript] w =.0542. The [eta][superscript]2-alkynes undergo redox reaction with diazo reagents and phosphine chalcogenides. They also abstract a chalcogenide from (TTP)Ti([eta][superscript]2-Ch[subscript]2) where Ch = O, S, Se;Treatment of (TTP)Ti=O with (OEP)Ti-Cl yields intermetal O/Cl exchange. This is formally a one electron redox process mediated by oxygen atom transfer. The equilibrium and forward rate constants at 20°C were determined to be 1.6 ± 0.4 and 2.4 ± 0.3 x 10[superscript]2 M[superscript]-1s[superscript]-1, respectively. Studies were performed to determine temperature, axial ligand, and solvent dependencies. Also, a zero-electron redox process mediated by atom transfer is observed when (TTP)TiCl[subscript]2 is treated with (OEP)Ti=O. The equilibrium constant was determined to be 47 ± 13 at 20°C. The forward rate constant was found to be 5 ± 1 at 20°C. Rate constants at various temperatures were determined to examine temperature dependence.
"],"dc:format.mimetype":["application/pdf"],"dc:identifier":["archive/lib.dr.iastate.edu/rtd/10444/"],"dc:identifier.doi":["https://doi.org/10.31274/rtd-180813-11882"],"dc:identifier.uri":["https://dr.lib.iastate.edu/handle/20.500.12876/63591"],"dc:language.iso":["en"],"dc:title":["The coordination and atom transfer chemistry of titanium porphyrin complexes"],"dc:type":["dissertation"],"thesis:degree_level":["dissertation"],"thesis:degree_name":["Doctor of Philosophy"]},"updated_at":"2026-07-24T02:37:38Z"}