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Rasheed W, Pal N, Aboelenen AM, Banerjee S, Oloo WN, Klein JEMN, Fan R, Xiong J, Guo Y, Que L. NMR and Mössbauer Studies Reveal a Temperature-Dependent Switch from S = 1 to 2 in a Nonheme Oxoiron(IV) Complex with Faster C-H Bond Cleavage Rates. J Am Chem Soc 2024; 146:3796-3804. [PMID: 38299607 DOI: 10.1021/jacs.3c10694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2024]
Abstract
S = 2 FeIV═O centers generated in the active sites of nonheme iron oxygenases cleave substrate C-H bonds at rates significantly faster than most known synthetic FeIV═O complexes. Unlike the majority of the latter, which are S = 1 complexes, [FeIV(O)(tris(2-quinolylmethyl)amine)(MeCN)]2+ (3) is a rare example of a synthetic S = 2 FeIV═O complex that cleaves C-H bonds 1000-fold faster than the related [FeIV(O)(tris(pyridyl-2-methyl)amine)(MeCN)]2+ complex (0). To rationalize this significant difference, a systematic comparison of properties has been carried out on 0 and 3 as well as related complexes 1 and 2 with mixed pyridine (Py)/quinoline (Q) ligation. Interestingly, 2 with a 2-Q-1-Py donor combination cleaves C-H bonds at 233 K with rates approaching those of 3, even though Mössbauer analysis reveals 2 to be S = 1 at 4 K. At 233 K however, 2 becomes S = 2, as shown by its 1H NMR spectrum. These results demonstrate a unique temperature-dependent spin-state transition from triplet to quintet in oxoiron(IV) chemistry that gives rise to the high C-H bond cleaving reactivity observed for 2.
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Affiliation(s)
- Waqas Rasheed
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Nabhendu Pal
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Ahmed M Aboelenen
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Saikat Banerjee
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Williamson N Oloo
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Johannes E M N Klein
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Ruixi Fan
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Jin Xiong
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Yisong Guo
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
| | - Lawrence Que
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
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Affiliation(s)
- Caitlin M. Anderson
- Department of Chemistry and Biochemistry, Ohio University, Athens, Ohio 45701, United States
| | - Ahmed M. Aboelenen
- Department of Chemistry and Biochemistry, Ohio University, Athens, Ohio 45701, United States
| | - Michael P. Jensen
- Department of Chemistry and Biochemistry, Ohio University, Athens, Ohio 45701, United States
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Sy Piecco KW, Aboelenen AM, Pyle JR, Vicente JR, Gautam D, Chen J. Kinetic Model under Light-Limited Condition for Photoinitiated Thiol-Ene Coupling Reactions. ACS Omega 2018; 3:14327-14332. [PMID: 30411064 PMCID: PMC6210074 DOI: 10.1021/acsomega.8b01725] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Accepted: 10/19/2018] [Indexed: 05/14/2023]
Abstract
Thiol-ene click chemistry has become a powerful paradigm in synthesis, materials science, and surface modification in the past decade. In the photoinitiated thiol-ene reaction, an induction period is often observed before the major change in its kinetic curve, for which a possible mechanism is proposed in this report. Briefly, light soaking generates radicals following the zeroth-order reaction kinetics. The radical is the reactant that initializes the chain reaction of thiol-ene coupling, which is a first-order reaction. Combining both and under the light-limited conditions, a surprising kinetics represented by a Gaussian-like model evolves that is different from the exponential model used to describe the first-order reaction of the final product. The experimental data are fitted well with the new model, and the reaction kinetic constants can be pulled out from the fitting.
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Affiliation(s)
- Kurt W.
E. Sy Piecco
- Department
of Chemistry and Biochemistry, Nanoscale and Quantum Phenomena
Institute, and Center for Intelligent Chemical Instrumentation, Ohio University, Athens, Ohio 45701, United States
| | - Ahmed M. Aboelenen
- Department
of Chemistry and Biochemistry, Nanoscale and Quantum Phenomena
Institute, and Center for Intelligent Chemical Instrumentation, Ohio University, Athens, Ohio 45701, United States
| | - Joseph R. Pyle
- Department
of Chemistry and Biochemistry, Nanoscale and Quantum Phenomena
Institute, and Center for Intelligent Chemical Instrumentation, Ohio University, Athens, Ohio 45701, United States
| | - Juvinch R. Vicente
- Department
of Chemistry and Biochemistry, Nanoscale and Quantum Phenomena
Institute, and Center for Intelligent Chemical Instrumentation, Ohio University, Athens, Ohio 45701, United States
| | - Dinesh Gautam
- Department
of Chemistry and Biochemistry, Nanoscale and Quantum Phenomena
Institute, and Center for Intelligent Chemical Instrumentation, Ohio University, Athens, Ohio 45701, United States
| | - Jixin Chen
- Department
of Chemistry and Biochemistry, Nanoscale and Quantum Phenomena
Institute, and Center for Intelligent Chemical Instrumentation, Ohio University, Athens, Ohio 45701, United States
- E-mail:
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Nonkumwong J, Erasquin UJ, Sy Piecco KW, Premadasa UI, Aboelenen AM, Tangonan A, Chen J, Ingram D, Srisombat L, Cimatu KLA. Successive Surface Reactions on Hydrophilic Silica for Modified Magnetic Nanoparticle Attachment Probed by Sum-Frequency Generation Spectroscopy. Langmuir 2018; 34:12680-12693. [PMID: 30300547 DOI: 10.1021/acs.langmuir.8b01333] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Successive surface reactions on hydrophilic silica substrates were designed and performed to immobilize ethanolamine-modified magnetic ferrite-based nanoparticle (NP) for surface characterization. The various surfaces were monitored using sum-frequency generation (SFG) spectroscopy. The surface of the hydrophilic quartz substrate was first converted to a vinyl-terminated surface by utilizing a silanization reaction, and then, the surface functional groups were converted to carboxylic-terminated groups via a thiol-ene reaction. The appearance and disappearance of the vinyl (═CH2) peak at ∼2990 cm-1 in the SFG spectra were examined to confirm the success of the silanization and thiol-ene reactions, respectively. Acyl chloride (-COCl) formation from carboxy (-COOH) functional group was then performed for further attachment of magnetic amine-functionalized magnesium ferrite nanoparticles (NPs) via amide bond formation. The scattered NPs attached on the modified silica substrate was then used to study the changes in the spectral profile of the ethanolamine modifier of the NPs for in situ lead(II) (Pb2+) adsorption at the solid-liquid interface using SFG spectroscopy. However, due to the limited number of NPs attached and sensitivity of SFG spectroscopy toward expected change in the modifier spectroscopically, no significant change was observed in the SFG spectrum of the modified silica with magnetic NPs during exposure to Pb2+ solution. Nevertheless, SFG spectroscopy as a surface technique successfully monitored the modifications from a clean fused substrate to -COCl formation that was used to immobilize the decorated magnetic nanoparticles. The method developed in this study can provide a reference for many surface or interfacial studies important for selective attachment of adsorbed organic or inorganic materials or particles.
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Affiliation(s)
- Jeeranan Nonkumwong
- Department of Chemistry and Biochemistry , Ohio University , 100 University Terrace, 136 Clippinger Laboratories , Athens , Ohio 45701-2979 , United States
- Department of Chemistry, Faculty of Science , Chiang Mai University , Chiang Mai 50200 , Thailand
| | - Uriel Joseph Erasquin
- Department of Chemistry and Biochemistry , Ohio University , 100 University Terrace, 136 Clippinger Laboratories , Athens , Ohio 45701-2979 , United States
| | - Kurt Waldo Sy Piecco
- Department of Chemistry and Biochemistry , Ohio University , 100 University Terrace, 136 Clippinger Laboratories , Athens , Ohio 45701-2979 , United States
| | - Uvinduni I Premadasa
- Department of Chemistry and Biochemistry , Ohio University , 100 University Terrace, 136 Clippinger Laboratories , Athens , Ohio 45701-2979 , United States
| | - Ahmed M Aboelenen
- Department of Chemistry and Biochemistry , Ohio University , 100 University Terrace, 136 Clippinger Laboratories , Athens , Ohio 45701-2979 , United States
| | - Andrew Tangonan
- Department of Chemistry and Biochemistry , Ohio University , 100 University Terrace, 136 Clippinger Laboratories , Athens , Ohio 45701-2979 , United States
| | - Jixin Chen
- Department of Chemistry and Biochemistry , Ohio University , 100 University Terrace, 136 Clippinger Laboratories , Athens , Ohio 45701-2979 , United States
| | - David Ingram
- Department of Physics and Astronomy , Ohio University , 139 University Terrace, 136 Clippinger Laboratories , Athens , Ohio 45701-2979 , United States
| | - Laongnuan Srisombat
- Department of Chemistry, Faculty of Science , Chiang Mai University , Chiang Mai 50200 , Thailand
| | - Katherine Leslee Asetre Cimatu
- Department of Chemistry and Biochemistry , Ohio University , 100 University Terrace, 136 Clippinger Laboratories , Athens , Ohio 45701-2979 , United States
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Kruse CP, Deb T, Aboelenen AM, Anderson CM, Petersen JL, Jensen MP. Variable Borohydride Hapticity in Nickel(II) Scorpionate Complexes [(TpR,Me)Ni(ηn‐BH4)]: TpR,Me = hydrotris{3‐R‐5‐methyl‐1‐pyrazolyl}borate; R = Ph, n = 3 vs. R = Me, n = 4. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501330] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Colin P. Kruse
- Department of Chemistry and Biochemistry Ohio University 45701 Athens Ohio USA
| | - Tapash Deb
- Department of Chemistry and Biochemistry Ohio University 45701 Athens Ohio USA
| | - Ahmed M. Aboelenen
- Department of Chemistry and Biochemistry Ohio University 45701 Athens Ohio USA
| | - Caitlin M. Anderson
- Department of Chemistry and Biochemistry Ohio University 45701 Athens Ohio USA
| | - Jeffrey L. Petersen
- C. Eugene Bennett Department of Chemistry West Virginia University 26506 Morgantown West Virginia USA
| | - Michael P. Jensen
- Department of Chemistry and Biochemistry Ohio University 45701 Athens Ohio USA
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