Parisa Mehrkhodavandi

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Parisa Mehrkhodavandi
Alma mater University of British Columbia B.Sc. (1998)
Massachusetts Institute of Technology Ph.D. (2002)
Scientific career
Institutions University of British Columbia (2005-present)
California Institute of Technology (2002-2005)
Thesis Living α-olefin polymerization by cationic zirconium and hafnium complexes containing chelating diamidopyridine ligands  (2002)
Doctoral advisor Richard R. Schrock
Other academic advisors Chris Orvig, John E. Bercaw and Robert H. Grubbs

Parisa Mehrkhodavandi is a Canadian chemist and Professor of Chemistry at the University of British Columbia (UBC). [1] Her research focuses on the design of new catalysts that can effect polymerization of sustainably sourced or biodegradable polymers.

Contents

Education and training

Parisa Mehrkhodavandi completed her undergraduate degree in chemistry at the University of British Columbia in 1998. During her undergraduate, she worked with Prof. Chris Orvig on the synthesis of novel sugar-containing chelating ligands, [2] and studies on the binding of these ligands to transition metal ions. [3] Mehrkhodavandi also studied cationic lanthanide coordination complexes. [4]

Mehrkhodavandi pursued graduate studies at the Massachusetts Institute of Technology under the supervision of Richard R. Schrock. Her work at MIT focused on the synthesis of cationic zirconium and hafnium complexes bearing arylated diamidopyridine ligands, [5] and the polymerization of 1-hexene with these catalysts. [6] [7] [8] Mehrkhodavandi graduated with her Ph.D. in 2002.

She conducted a post-doctoral research stint at the California Institute of Technology working together with John E. Bercaw and Robert H. Grubbs. There, she studied the mechanism of a reaction of methanol to triptane with indium(III) iodide and zinc(II) iodide as catalysts. [9] [10]

Independent career

Mehrkhodavandi returned to the University of British Columbia as faculty in 2005 and was later promoted to associate professor in 2013.

Over her career, Mehrkhodavandi has been recognized with numerous awards, including but not limited to:

Research

Mehrkhodavandi is interested in developing catalysts that are highly active and enantioselective for the polymerization of lactide. Currently, catalysts for similar polymerizations must strike a balance between activity and enantioselectivity; the highly-active catalysts have poor enantioselectivity and vice versa. Highly active and enantioselective catalysts.png
Mehrkhodavandi is interested in developing catalysts that are highly active and enantioselective for the polymerization of lactide. Currently, catalysts for similar polymerizations must strike a balance between activity and enantioselectivity; the highly-active catalysts have poor enantioselectivity and vice versa.

Mehrkhodavandi’s research focuses on catalysis, where her group is pursuing new ligand design strategies. Her work has contributed to new synthetic routes for biodegradable polymers, [11] and fundamental insights into polymerization mechanisms. Her group has a specific interest in the formation of catalysts, such as chiral dinuclear indium complexes, that allow for enantioselective organic reactions. [12] [13] [14] [15] Mehrkhodavandi is also working on the development of biodegradable polyesters using these ligands using cyclic ester monomers. This is being done in three main ways: the first of which is the use of Lewis acid metal centers with chiral ligand supports to open cyclic lactones via ring-opening polymerizations. [16] [17] The second is the use of a chiral indium salen catalyst that allows for more precise iso-selectivity similar to chiral aluminum salen catalysts, but with higher activity than aluminum catalysts. The final method utilizes an ethoxy-bridged dinuclear indium catalyst [14] that allows for the creation of diblock copolymers due to its high activity and selective control.

Mehrkhodavandi has patented salen indium catalysts for the ring-opening polymerization of cyclic ester monomers like lactides. [18] [19] [20]

Mehrkhodavandi's research interests involve developing catalysts for ring-opening polymerizations. Ring-opening polymerizations involve opening up a ring-molecule via. nucleophillic attack to form a nucleophillic monomer, which can then continue the reaction to form a polymer. For different combinations of nucleophiles and rings, different catalysts are required. Dinuclear catalysts for controlled ring opening polymerization of cyclic esters.png
Mehrkhodavandi’s research interests involve developing catalysts for ring-opening polymerizations. Ring-opening polymerizations involve opening up a ring-molecule via. nucleophillic attack to form a nucleophillic monomer, which can then continue the reaction to form a polymer. For different combinations of nucleophiles and rings, different catalysts are required.

Publications

Mehrkhodavandi has published a significant amount of publications over her career. In recent works, Mehrkhodavandi writes about the role of the first alkoxide-bridged indium complex and the zinc analogues as important catalysts in the ring opening polymerization of lactides into polylactic acid. [12] The article pertains to how the indium complex bearing either the chiral or achiral ligand allows for the polymerization of racemic lactide into a highly heterotactic polylactic acid and how the indium complex along with the chiral ligand polymerizes meso-lactide into virtually atactic polylactic acid. Mehrkhodavandi discusses the mechanisms of these reactions in detail, along with the synthesis of the catalysts and activity of the resulting polymers. In another paper, Mehrkhodavandi writes about the use of an indium catalyst as a catalyst for lactide polymerization that has both high activity and high enantioselectivity - other lactide polymerizations feature either high activity or high enantioselectivity. [13] The results demonstrate site control as the primary factor behind the selectivity of the catalyst.

Related Research Articles

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<span class="mw-page-title-main">Organozirconium and organohafnium chemistry</span>

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<span class="mw-page-title-main">Metal salen complex</span> Coordination complex

A metal salen complex is a coordination compound between a metal cation and a ligand derived from N,N′-bis(salicylidene)ethylenediamine, commonly called salen. The classical example is salcomine, the complex with divalent cobalt Co2+, usually denoted as Co(salen). These complexes are widely investigated as catalysts and enzyme mimics.

<span class="mw-page-title-main">Boranylium ions</span>

In chemistry, a boranylium ion is an inorganic cation with the chemical formula BR+
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<span class="mw-page-title-main">Trisoxazolines</span>

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<span class="mw-page-title-main">1,1-Dimethylethylenediamine</span> Chemical compound

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References

  1. ↑ "Parisa Mehrkhodavandi | UBC Chemistry". www.chem.ubc.ca. Retrieved 2021-06-10.
  2. ↑ Yano, Shigenobu; Shinohara, Yoshie; Mogami, Kaoru; Yokoyama, Mika; Tanase, Tomoaki; Sakakibara, Toru; Nishida, Fumiko; Mochida, Kenichi; Kinoshita, Isamu; Doe, Matsumi; Ichihara, Kanako (2003-05-01). "General Synthesis of Useful Chelating Reagents Having a Sugar Unit, 1,3-Diamino-2-propyl β-D-Glucopyranoside and 1,3-Diamino-2-propyl α-D-Mannopyranoside". Chemistry Letters. 28 (3): 255–256. doi:10.1246/cl.1999.255.
  3. ↑ Song, Bin; Mehrkhodavandi, Parisa; Buglyó, Péter; Mikata, Yuji; Shinohara, Yoshie; Yoneda, Kazumi; Yano, Shigenobu; Orvig, Chris (2000-01-01). "Acid–base and metal ion-binding properties of diaminopropyl D-glucopyranoside and diaminopropyl D-mannopyranoside compounds in aqueous solution". Journal of the Chemical Society, Dalton Transactions (8): 1325–1333. doi:10.1039/A908384G. ISSN   1364-5447.
  4. ↑ Caravan, P.; Mehrkhodavandi, Parisa; Orvig, Chris (1997-03-01). "Cationic Lanthanide Complexes of N,N'-Bis(2-pyridylmethyl)ethylenediamine-N,N'-diacetic Acid (H2bped)". Inorganic Chemistry. 36 (7): 1316–1321. doi:10.1021/ic9613016. ISSN   0020-1669. PMID   11669707.
  5. ↑ Mehrkhodavandi, Parisa; Schrock, Richard R.; Bonitatebus, Peter J. (2002-12-01). "Synthesis and Structures of Zirconium and Hafnium Alkyl Complexes That Contain [H3CC(2-C5H4N)(CH2NAr)2]2- ([ArNpy]2-; Ar = Mesityl, Triisopropylphenyl) Ligands". Organometallics. 21 (26): 5785–5798. doi:10.1021/om0207055. ISSN   0276-7333.
  6. ↑ Mehrkhodavandi, Parisa; Bonitatebus, Peter J.; Schrock, Richard R. (2000-08-01). "A Comparison of Cationic Zirconium Methyl and Isobutyl Initiators that Contain an Arylated Diamido-Pyridine Ligand for Polymerization of 1-Hexene. Elucidation of a Dramatic "Initiator Effect"". Journal of the American Chemical Society. 122 (32): 7841–7842. doi:10.1021/ja000772v. ISSN   0002-7863.
  7. ↑ Mehrkhodavandi, Parisa; Schrock, Richard R. (2001-10-31). "Cationic Hafnium Alkyl Complexes that Are Stable toward β-Hydride Elimination below 10 °C and Active as Initiators for the Living Polymerization of 1-Hexene". Journal of the American Chemical Society. 123 (43): 10746–10747. doi:10.1021/ja0114198. ISSN   0002-7863. PMID   11674011.
  8. ↑ Mehrkhodavandi, Parisa; Schrock, Richard R.; Pryor, Lara L. (2003-10-03). "Living Polymerization of 1-Hexene by Cationic Zirconium and Hafnium Complexes that Contain a Diamido/Donor Ligand of the Type [H3CC(2-C5H4N)(CH2NMesityl)2]2-. A Comparison of Methyl and Isobutyl Initiators". Organometallics. 22 (22): 4569–4583. doi:10.1021/om030438i. ISSN   0276-7333.
  9. ↑ Bercaw, John E.; Diaconescu, Paula L.; Grubbs, Robert H.; Hazari, Nilay; Kay, Richard D.; Labinger, Jay A.; Mehrkhodavandi, Parisa; Morris, George E.; Sunley, Glenn J.; Vagner, Patrick (2007-11-30). "Conversion of Methanol to 2,2,3-Trimethylbutane (Triptane) over Indium(III) Iodide". Inorganic Chemistry. 46 (26): 11371–11380. doi:10.1021/ic7014447. ISSN   0020-1669. PMID   18047325.
  10. ↑ Bercaw, John E.; Diaconescu, Paula L.; Grubbs, Robert H.; Kay, Richard D.; Kitching, Sarah; Labinger, Jay A.; Li, Xingwei; Mehrkhodavandi, Parisa; Morris, George E.; Sunley, Glenn J.; Vagner, Patrick (2006-10-19). "On the Mechanism of the Conversion of Methanol to 2,2,3-Trimethylbutane (Triptane) over Zinc Iodide". The Journal of Organic Chemistry. 71 (23): 8907–8917. doi:10.1021/jo0617823. ISSN   0022-3263. PMID   17081022.
  11. ↑ Xu, Cuiling; Yu, Insun; Mehrkhodavandi, Parisa (2012-06-12). "Highly controlled immortal polymerization of β-butyrolactone by a dinuclear indium catalyst". Chemical Communications. 48 (54): 6806–6808. doi:10.1039/C2CC33114D. ISSN   1364-548X. PMID   22669203.
  12. 1 2 Kremer, Alexandre B.; Osten, Kimberly M.; Yu, Insun; Ebrahimi, Tannaz; Aluthge, Dinesh C.; Mehrkhodavandi, Parisa (2016-06-06). "Dinucleating Ligand Platforms Supporting Indium and Zinc Catalysts for Cyclic Ester Polymerization". Inorganic Chemistry. 55 (11): 5365–5374. doi:10.1021/acs.inorgchem.6b00358. ISSN   0020-1669. PMID   27187767.
  13. 1 2 Aluthge, Dinesh C.; Patrick, Brian O.; Mehrkhodavandi, Parisa (2013-04-19). "A highly active and site selective indium catalyst for lactide polymerization". Chemical Communications. 49 (39): 4295–4297. doi:10.1039/C2CC33519K. ISSN   1364-548X. PMID   22729290.
  14. 1 2 Osten, Kimberly M.; Yu, Insun; Duffy, Ian R.; Lagaditis, Paraskevi O.; Yu, Joey C.-C.; Wallis, Christopher J.; Mehrkhodavandi, Parisa (2012-06-15). "Effects of ligand tuning on dinuclear indium catalysts for lactide polymerization". Dalton Transactions. 41 (26): 8123–8134. doi:10.1039/C2DT30148B. ISSN   1477-9234. PMID   22481250.
  15. ↑ Douglas, Amy F.; Patrick, Brian O.; Mehrkhodavandi, Parisa (2008). "A Highly Active Chiral Indium Catalyst for Living Lactide Polymerization". Angewandte Chemie International Edition. 47 (12): 2290–2293. doi: 10.1002/anie.200705033 . ISSN   1521-3773. PMID   18273846.
  16. ↑ Broderick, Erin M.; Guo, Neng; Vogel, Carola S.; Xu, Cuiling; Sutter, Jörg; Miller, Jeffrey T.; Meyer, Karsten; Mehrkhodavandi, Parisa; Diaconescu, Paula L. (2011-06-22). "Redox Control of a Ring-Opening Polymerization Catalyst". Journal of the American Chemical Society. 133 (24): 9278–9281. doi:10.1021/ja2036089. ISSN   0002-7863. PMID   21604745.
  17. ↑ Wang, Xinke; Thevenon, Arnaud; Brosmer, Jonathan L.; Yu, Insun; Khan, Saeed I.; Mehrkhodavandi, Parisa; Diaconescu, Paula L. (2014-08-13). "Redox Control of Group 4 Metal Ring-Opening Polymerization Activity toward l-Lactide and ε-Caprolactone". Journal of the American Chemical Society. 136 (32): 11264–11267. doi:10.1021/ja505883u. ISSN   0002-7863. PMID   25062499. S2CID   22098566.
  18. ↑ US 9777023,Mehrkhodavandi, Parisa; Yu, Insun& Acosta-Ramirez, J. Alberto,"Dinuclear indium catalysts and their use for (Co)polymerization of cyclic esters",published 2017-10-03, assigned to University of British Columbia
  19. ↑ USapplication 20150018493,Mehrkhodavandi, Parisa; Aluthge, Dinesh C.& Clark, Timothy Jameset al.,"Salen indium catalysts and methods of manufacture and use thereof",published 2015-01-15, assigned to Greencentre Canada and University of British Columbia , now abandoned.
  20. ↑ US 10280185,Mehrkhodavandi, Parisa&Aluthge, Dinesh C.,"Mononuclear salen indium catalysts and methods of manufacture and use thereof",published 2019-05-07, assigned to University of British Columbia
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