Coming to campus? Visit this page for important information.

Johnson Group Chemistry

TOC: Cooperative Carbon

Johnson Chemistry Group

RESEARCH INTERESTS

Inert bond activation (C-H, C-C, C-O, C-S, C-F), organometallic chemistry, nickel, clusters.

See what we are up to on our Group Twitter page: https://twitter.com/JohnsonGrpChem


PUBLICATIONS

2019

[54] F Matthew R. Elsby, Junyang Liu, Sha Zhu, Lingfei Hu, Genping Huang*, and Samuel A. Johnson* “Influence of N-Heterocyclic Carbene Steric Bulk on Selectivity in Nickel Catalyzed C–H Bond Silylation, Germylation and Stannylation”, Organometallics ASAP. 2019. https://pubs.acs.org/doi/10.1021/acs.organomet.8b00786

TOC:Influence of N-Heterocyclic Carbene Steric Bulk on Selectivity in Nickel Catalyzed C–H Bond Silylation, Germylation and Stannylation

2018

[53]F Shoshani, Manar M.; Semeniuchenko, Volodymyr; Samuel A. Johnson “Dismantling of Vinyl Ethers by Pentanuclear [(iPr3P)Ni]5H6: Facile Cooperative CO, CC and CH Activation Pathways” Chemistry-A European Journal2018, 24, 14282-14289. http://dx.doi.org/10.1002/chem.201803451

TOC:Dismantling of Vinyl Ethers by Pentanuclear [(iPr3P)Ni]5H6: Facile Cooperative CO, CC and CH Activation Pathways

[52]F Shoshani, Manar M.; Liu, Junyang; Johnson, Samuel A. “Mechanistic Insight into H /D Exchange by a Pentanuclear Ni- H Cluster and Synthesis and Characterization of Structural Analogues of Potential Intermediates” Organometallics 2018, 37(1), 116-126. https://pubs.acs.org/doi/10.1021/acs.organomet.7b00763

TOC:Mechanistic Insight into H /D Exchange by a Pentanuclear Ni- H Cluster and Synthesis and Characterization of Structural Analogues of Potential Intermediate

[51]F Shoshani, Manar M.; Beck, Robert; Wang, Xiaoping; McLaughlin, Matthew J.; Johnson, Samuel A. “Synthesis of Surface- Analogue Square- Planar Tetranuclear Nickel Hydride Clusters and Bonding to μ4- NR, - O and - BH Ligands” Inorganic Chemistry 2018, 57(5), 2438-2446. (Invited “Skeeball” cover) https://pubs.acs.org/doi/10.1021/acs.inorgchem.7b02546

TOC:Synthesis of Surface- Analogue Square- Planar Tetranuclear Nickel Hydride Clusters and Bonding to μ4- NR, - O and - BH Ligands

2017

[50]F Shoshani, Manar M.; Johnson, Samuel A. “Cooperative carbon- atom abstraction from alkenes in the core of a pentanuclear nickel cluster” Nature Chemistry 2017, 9(12), 1282-1285. https://www.nature.com/articles/nchem.2840.pdf

TOC:Cooperative carbon- atom abstraction from alkenes in the core of a pentanuclear nickel cluster

[49]F Elsby, Matthew R.; Johnson, Samuel A. “Nickel- Catalyzed C- H Silylation of Arenes with Vinylsilanes: Rapid and Reversible β- Si Elimination” Journal of the American Chemical Society 2017, 139(27), 9401-9407. Also featured in 2018 JACS Young Investigators Virtual Issue: https://pubs.acs.org/page/jacsat/vi/young-investigator2018.html https://pubs.acs.org/doi/10.1021/jacs.7b05574

TOC:Nickel- Catalyzed C- H Silylation of Arenes with Vinylsilanes: Rapid and Reversible β- Si Elimination

[48]F Zhu, Sha; Shoshani, Manar M.; Johnson, Samuel A. “Versatile (η6- arene) Ni(PCy3) nickel monophosphine precursors" Chemical Communications 2017, 53(98), 13176-13179. https://pubs.rsc.org/en/content/articlehtml/2017/cc/c7cc08416a

TOC:Versatile (η6- arene) Ni(PCy3) nickel monophosphine precursors

[47]F Baird, Drake A.; Jamal, S.; Johnson, Samuel A. “Influence of the Transmetalating Agent in Difficult Coupling Reactions: Control in the Selectivity of C- F Bond Activation by Ni(0) Complexes in the Presence of AlMe3” Organometallics 2017, 36(7), 1436-1446. https://pubs.acs.org/doi/abs/10.1021/acs.organomet.7b00165

TOC:“Influence of the Transmetalating Agent in Difficult Coupling Reactions: Control in the Selectivity of C- F Bond Activation by Ni(0) Complexes in the Presence of AlMe3

 

2015

[46]R Johnson, S. A.  “Nickel complexes for catalytic C-H bond functionalization” 2015 Dalton Trans., 44(24), 10905-10913. https://pubs.rsc.org/en/content/articlehtml/2015/dt/c5dt00032g

TOC:Nickel complexes for catalytic C-H bond functionalization

[45]F Shoshani, Manar M.; Johnson, Samuel A. “Facile Deep and Ultradeep Hydrodesulfurization by the [(iPr3P)Ni]5H6 Cluster Compared to Mononuclear Ni Sources” 2015 Inorg. Chem. , 54(24), 11977-11985. https://pubs.acs.org/doi/10.1021/acs.inorgchem.5b02383

TOC:Facile Deep and Ultradeep Hydrodesulfurization by the [(iPr3P)Ni]5H6 Cluster Compared to Mononuclear Ni Sources

[44]F Hatnean, Jillian A.; Johnson, Samuel A. “Diamagnetic molybdenum nitride complexes supported by diligating tripodal triamido-phosphine ligands as precursors to paramagnetic phosphine donors”  Dalton Transactions 2015, 44(33), 14925-14936. https://pubs.rsc.org/en/content/articlelanding/2015/dt/c5dt01415h

TOC:Diamagnetic molybdenum nitride complexes supported by diligating tripodal triamido-phosphine ligands as precursors to paramagnetic phosphine donors

 

2014

[43]F Hatnean, Jillian A.; Shoshani, Manar; Johnson, Samuel A.  “Mechanistic insight into carbon-fluorine cleavage with a (iPr3P)2Ni source: Characterization of (iPr3P)2NiC6F5 as a significant Ni(I) byproduct in the activation of C6F6” 2014 Inorg.Chim. Acta , 422, 86-94. Special issue in honour of T. Don Tilley. https://www.sciencedirect.com/science/article/pii/S0020169314004319

TOC:Mechanistic insight into carbon-fluorine cleavage with a (iPr3P)2Ni source: Characterization of (iPr3P)2NiC6F5 as a significant Ni(I) byproduct in the activation of C6F6

 

2013

[42]F Doster, M.E.; Johnson, S. A.* "Carbon-hydrogen Bond Stannylation and Alkylation by Nitrogen-Donor-Supported Nickel Complexes: Intermediates with Ni-Sn Bonds and Catalytic Carbostannylation of Ethylene with Organostannanes" Organometallics2013, 32(10), 2944-2951. https://pubs.acs.org/doi/10.1021/om4003889

TOC:Carbon-hydrogen Bond Stannylation and Alkylation by Nitrogen-Donor-Supported Nickel Complexes: Intermediates with Ni-Sn Bonds and Catalytic Carbostannylation of Ethylene with Organostannanes

[41]F Beck, R.; Johnson, S. A.* "Dinuclear Ni(I)-Ni(I) Complexes with Syn-Facial Bridging Ligands from Ni(I) Precursors or Ni(II)/Ni(0) Comproportionation" Organometallics2013, 32(10), 2944-2951. https://pubs.acs.org/doi/10.1021/om4001633

TOC:Dinuclear Ni(I)-Ni(I) Complexes with Syn-Facial Bridging Ligands from Ni(I) Precursors or Ni(II)/Ni(0) Comproportionation

[40]F Beck, R.; Shoshani, M.; Krasinckiewicz, J.; Johnson, S. A.* "Synthesis and Chemistry of Bis(triisopropylphosphine)nickel(I) and nickel(0) precursors" Dalton Trans.2013, 42(5), 14611475. https://pubs.rsc.org/en/content/articlehtml/2013/dt/c2dt32008h

 

2012

[39]C Beck, R.; Shoshani, M.; Johnson, S. A.* "Catalytic H/D Exchange of Unactivated C-H Bonds by A Pentanuclear Electron-Deficient Nickel Hydride Cluster" Angew. Chem. Int. Ed.2012, 51(47), 11753-11756.

[38] Johnson, Samuel A; Doster, Meghan E.; Matthews, Jacob; Shoshani, Manar; Thibodeau, Michelle; Labadie, Amanda; Hatnean, Jillian A. “Mechanistic Investigation of Carbon-Hydrogen Bond Stannylation: Synthesis and Characterization of Nickel Catalysts”, 2012Dalton Trans. 41(26), 8135-8143. Invited article for special issue “New Talent: The Americas. https://pubs.rsc.org/en/Content/ArticleLanding/2012/DT/c2dt30310h

TOC:Mechanistic Investigation of Carbon-Hydrogen Bond Stannylation: Synthesis and Characterization of Nickel Catalysts

37) Beck, Robert; Johnson, Samuel A. “Structural Similarities in Dinuclear, Tetranuclear, and Pentanuclear Nickel Silyl and Silylene Complexes Obtained via Si-H and Si-C Activation", Organometallics 2012, 31(9), 3599-3609. https://pubs.acs.org/doi/10.1021/om300120x

TOC: Structural Similarities in Dinuclear, Tetranuclear, and Pentanuclear Nickel Silyl and Silylene Complexes Obtained via Si-H and Si-C Activation

36) Hatnean, Jillian A.; Johnson, Samuel A.*; Experimental Study of the Reaction of a Ni(PEt3)2 Synthon with Polyfluorinated Pyridines: Concerted, Phosphine-Assisted, or Radical C-F Bond Activation Mechanisms?" Organometallics 2012, 31(4), 1361-1373. https://pubs.acs.org/doi/abs/10.1021/om200990g

TOC: Experimental Study of the Reaction of a Ni(PEt3)2 Synthon with Polyfluorinated Pyridines: Concerted, Phosphine-Assisted, or Radical C-F Bond Activation Mechanisms?

35) Johnson, Samuel A.; Hatnean, Jillian A.; Doster M.; Editor: Karlin, K.D.. "Functionalization of Fluorinated Aromatics by Nickel-Mediated C-H and C-F Bond Oxidative Addition: Prospects for the Synthesis of Fluorine-Containing Pharmaceuticals" Prog. Inorg. Chem., l 2012, 57 pg 255-352.

 

2011

34) Beck, Robert Johnson, Samuel A.*. “Mechanistic Implications of an asymmetric dinuclear intermediate in catalytic C–C coupling by a dinuclear nickel complex” Chem. Comm. 2011, 47(32), 9233-9235. https://pubs.rsc.org/en/content/articlelanding/2011/cc/c1cc12657a

TOC: Mechanistic Implications of an asymmetric dinuclear intermediate in catalytic C–C coupling by a dinuclear nickel complex

33) Feng, J.; Green, J.R.; Johnson, S. A.; Wang, Jichang “CO2 production in the bromate-1,4-cyclohexanedione oscillatory reaction” J. Phys. Org. Chem. 2011, 24(6), 507-512.

32) Johnson, Samuel A.*; Mroz, Natalia M.; Valdizon, Rene; Murray, Scott. “Characterization of Intermediates in the C-F Activation of Tetrafluorobenzenes using a Reactive Ni(PEt3)2 Synthon: Combined Computational and Experimental Investigation” Organometallics 2011, 30(3), 441-457. https://pubs.acs.org/doi/10.1021/om100699d

TOC: Characterization of Intermediates in the C-F Activation of Tetrafluorobenzenes using a Reactive Ni(PEt3)2 Synthon: Combined Computational and Experimental Investigation

 

2010

31) Doster, Meghan E.; Hatnean, Jillian A.; Jeftic, Tamara; Modi, Sunjay; Johnson, Samuel A.* “Catalytic C-H Bond Stannylation: A New Regioselective Pathway to C-Sn Bonds via C-H Bond Functionalization” J. Am. Chem. Soc. 2010, 132(34), 11923-11925. https://pubs.acs.org/doi/10.1021/ja105588v

TOC:Catalytic C-H Bond Stannylation: A New Regioselective Pathway to C-Sn Bonds via C-H Bond Functionalization

30) Hatnean, Jillian A.; Beck, Robert; Borrelli, Jenna D.; Johnson, Samuel A.* “Carbon-Hydrogen Bond Oxidative Addition of Partially Fluorinated Aromatics to a Ni(P-i-Pr3)2 Synthon: The Influence of Steric Bulk on the Thermodynamics and Kinetics of C-H Bond Activation” Organometallics 2010, 29(22), 6077-6091. https://pubs.acs.org/doi/10.1021/om1008499

TOC:Carbon-Hydrogen Bond Oxidative Addition of Partially Fluorinated Aromatics to a Ni(P-i-Pr3)2 Synthon: The Influence of Steric Bulk on the Thermodynamics and Kinetics of C-H Bond Activation

29) Rossini, Aaron J.; Hung, Ivan; Johnson, Samuel A.; Slebodnick, Carla; Mensch, Mike; Deck, Paul A.; Schurko, Robert W. “Solid-State 91Zr NMR Spectroscopy Studies of Zirconocene Olefin Polymerization Catalyst Precursors” J. Am. Chem. Soc. 2010, 132(51), 18301-18317.

 

2009

28) Meghan E. Doster, and Samuel A. Johnson* “Selective C-F Activation of Tetrafluorobenzenes by Ni(0) with a Nitrogen Donor Analogous to N-Heterocyclic Carbenes” Angew. Chem., Int. Ed. 2009, 48, 2185-2187.https://onlinelibrary.wiley.com/doi/full/10.1002/anie.200806048

TOC: Selective C-F Activation of Tetrafluorobenzenes by Ni(0) with a Nitrogen Donor Analogous to N-Heterocyclic Carbenes

27) Johnson, Samuel A.*; Taylor, Erin T.; Cruise, Sean J. "A Combined Experimental and Computational Study of Unexpected C-F Bond Activation Intermediates and Selectivity in the Reaction of Pentafluorobenzene with a (PEt3)2Ni Synthon" Organometallics 2009, 28(13), 3842-3855. https://pubs.acs.org/doi/10.1021/om900176v

TOC:A Combined Experimental and Computational Study of Unexpected C-F Bond Activation Intermediates and Selectivity in the Reaction of Pentafluorobenzene with a (PEt3)2Ni Synthon

26) Miller, Adam D.; Tannaci, John F.; Johnson, Samuel A.; Lee, Hyuk; McBee, Jennifer L.; Tilley, T. Don. Mesityl Alkyne Substituents for Control of Regiochemistry and Reversibility in Zirconocene Couplings: New Synthetic Strategies for Unsymmetrical Zirconacyclopentadienes and Conjugated Polymers. J. Am. Chem. Soc. 2009, 131(13), 4917-4927.

25) Miller, Adam D.; Johnson, Samuel A.; Tupper, Karl A.; McBee, Jennifer L.; Tilley, T. Don. Unsymmetrical Zirconacyclopentadienes from Isolated Zirconacyclopropenes with 1-Alkynylphosphine Ligands. Organometallics 2009, 28(4)

 

2008

24) Johnson, S. A.*; Huff, C. W.; Mustafa, F.; Saliba, M. “Unexpected Intermediates and Products in the C-F Bond Activation of Tetrafluorobenzenes with a Bis(triethylphosphine)Nickel Synthon: Direct Evidence of a Rapid and Reversible C-H Bond Activation by Ni(0)” J. Am. Chem. Soc.2008, 130(51), 17278-17280. https://pubs.acs.org/doi/abs/10.1021/ja8081395

TOC: Unexpected Intermediates and Products in the C-F Bond Activation of Tetrafluorobenzenes with a Bis(triethylphosphine)Nickel Synthon: Direct Evidence of a Rapid and Reversible C-H Bond Activation by Ni(0)

23) Han, H; Johnson, S. A.* “Bridged Dinuclear Tripodal Tris(amido)phosphine Complexes of Titanium and Zirconium as Diligating Building Blocks for Organometallic Polymers” Eur. J. Inorg. Chem.2008, 3, 471-482. https://onlinelibrary.wiley.com/doi/full/10.1002/ejic.200701015

TOC: Bridged Dinuclear Tripodal Tris(amido)phosphine Complexes of Titanium and Zirconium as Diligating Building Blocks for Organometallic Polymers

22) Ritu Raturi, Julie Lefebvre, Daniel B. Leznoff, Bruce R. McGarvey, and Samuel A. Johnson* “A Phosphine-Mediated Through-Space Exchange Coupling Pathway for Unpaired Electrons in a Heterobimetallic Lanthanide-Transition Metal Complex” Chem.--Eur. J.2008, 14(2), 721-730. https://onlinelibrary.wiley.com/doi/full/10.1002/chem.200700355

TOC: A Phosphine-Mediated Through-Space Exchange Coupling Pathway for Unpaired Electrons in a Heterobimetallic Lanthanide-Transition Metal Complex

 

2007

21) Alana L. Keen, Meghan Doster, and Samuel A. Johnson* “1,4-Shifts in a Dinuclear Ni(I) Biarylyl Complex: A Mechanistic Study of C-H Bond Activation by Monovalent Nickel” J. Am. Chem. Soc., 2007, 129, 810-819. https://pubs.acs.org/doi/10.1021/ja067112w

TOC: 1,4-Shifts in a Dinuclear Ni(I) Biarylyl Complex: A Mechanistic Study of C-H Bond Activation by Monovalent Nickel

 

2006

20) Jillian A. Hatnean, Ritu Raturi, Julie Lefebvre, Daniel B. Leznoff, Gavin Lawes, and Samuel A. Johnson*; “Assembly of Triangular Trimetallic Complexes by Triamidophosphine Ligands: Spin-Frustrated Mn2+ Plaquettes and Diamagnetic Mg2+ Analogues with a Combined Through-Space Through-Bond Pathway for 31P-31P Spin-Spin Coupling”, J. Am. Chem. Soc. 2006, 128, 14992-14999. https://pubs.acs.org/doi/abs/10.1021/ja065597i

TOC: Assembly of Triangular Trimetallic Complexes by Triamidophosphine Ligands: Spin-Frustrated Mn2+ Plaquettes and Diamagnetic Mg2+ Analogues with a Combined Through-Space Through-Bond Pathway for 31P-31P Spin-Spin Coupling

19) Han, H; Johnson, S. A.*, "Ligand Design for the Assembly of Polynuclear Complexes: Syntheses and Structures of Trinuclear and Tetranuclear Aluminum Alkyl Complexes Bearing Tripodal Diamidoselenophosphinito Ligands and a Comparison to Related Tripodal Triamidophosphine Complexes" Organometallics 2006, 5594-5602. https://pubs.acs.org/doi/abs/10.1021/om0607447

TOC: Ligand Design for the Assembly of Polynuclear Complexes: Syntheses and Structures of Trinuclear and Tetranuclear Aluminum Alkyl Complexes Bearing Tripodal Diamidoselenophosphinito Ligands and a Comparison to Related Tripodal Triamidophosphine Complexes

18) Han, H.; Elsmaili, M.; Johnson*, S. A. "A Diligating Tripodal Amido-Phosphine Ligand: The Effect of a Proximal Antipodal Early Transition Metal on Phosphine Donor Ability in a Building Block for Heterometallic Complexes" Inorg. Chem. 2006, 45, 7435-7445. http://pubs.acs.org/cgi-bin/article.cgi/inocaj/2006/45/i18/pdf/ic060692d.pdf

TOC: A Diligating Tripodal Amido-Phosphine Ligand: The Effect of a Proximal Antipodal Early Transition Metal on Phosphine Donor Ability in a Building Block for Heterometallic Complexes

17) Keen, A. L.; Doster, M.; Han, H.; Johnson, S. A.*, "Facile Assembly of a Cu9 Amido Complex: A New Tripodal Ligand Design that Promotes Transition Metal Cluster Formation" Chem. Commun. 2006, 1221-1223. http://www.rsc.org/ej/CC/2006/b517531c.pdf

TOC: Facile Assembly of a Cu9 Amido Complex: A New Tripodal Ligand Design that Promotes Transition Metal Cluster Formation

16) Keen, A. L.; Johnson, S. A.*, "Ni(0) Catalyzed Isomerization of an Aryne Complex: Formation of a Dinuclear Ni(I) Complex via C-H Rather than C-F Bond Activation" J. Am. Chem. Soc. 2006, 128, 1806-1807. http://pubs.acs.org/cgi-bin/article.cgi/jacsat/2006/128/i06/pdf/ja0572553.pdf

TOC: Ni(0) Catalyzed Isomerization of an Aryne Complex: Formation of a Dinuclear Ni(I) Complex via C-H Rather than C-F Bond Activation

 

1996-2005

15) Studt, Felix; MacKay, Bruce A.; Johnson, Samuel A.; Patrick, Brian O.; Fryzuk, Michael D.; Tuczek, Felix. "Lewis adducts of the side-on end-on dinitrogen-bridged complex [{(NPN)Ta}2(m -H)2(m -h 1:h 2-N2)] with AlMe3, GaMe3, and B(C6F5)3: Synthesis, structure, and spectroscopic properties" Chem.--Eur. J., 2005, 11(2), 604-618.

14) Shaver, Michael P.; Johnson, Samuel A.; Fryzuk, Michael D. "Activation and cleavage of alkynes by the dinuclear tantalum complexes ([NPN]Ta)2(m -H)4 and ([NPN]Ta)2(m -h 1:h 2-N2)(m -H)2 (where NPN = PhP(CH2SiMe2NPh)2)" Can. J. Chem. 2005, 83(6-7), 652-660.

13) MacKay, Bruce A.; Johnson, Samuel A.; Patrick, Brian O.; Fryzuk, Michael D. "Functionalization and cleavage of coordinated dinitrogen via hydroboration using primary and secondary boranes" Can. J. Chem. 2005, 83(4), 315-323.

12) Johnson, S. A.; Liu, F.-Q.; Suh, M. C.; Zürcher, S.; Haufe, M.; Tilley, T. D. “Regioselective Coupling of Pentafluorophenyl Substituted Alkynes: Mechanistic Insight into the Zirconocene Coupling of Alkynes and a Facile Route to Conjugated Polymers Bearing Electron-Withdrawing Pentafluorophenyl Substituents” J. Am. Chem. Soc. 2003, 125, 4199-4211.

11) Fryzuk, M. D.; MacKay, B. A.; Johnson, S. A.; Patrick, B. O. “Hydroboration of Coordinated Dinitrogen: A New Reaction of the N2 Ligand that Results in Its Functionalization and Cleavage” Angew. Chem. Int. Ed. Engl. 2002, 41, 3709-3712.

10) Fryzuk, M. D.; Johnson, S. A.; Patrick, B. O.; Albinati, A.; Mason, S. A.; Koetzle, T. F. “New Mode of Coordination for the Dinitrogen Ligand: Formation, Bonding, and Reactivity of a Tantalum Complex with a Bridging N2 Unit That Is Both Side-on and End-on” J. Am. Chem. Soc. 2001, 123, 3960-3973 http://pubs.acs.org/journals/jacsat/article.cgi/jacsat/2001/123/i17/pdf/ja0041371.pdf

9) Fryzuk, M. D.; Johnson, S. A.; Rettig, S. J. “Synthesis of [P2N2]Ta(C2H4)Et, a Neutral Species with a Beta-Agostic Ethyl Group in Equilibrium with an Alpha-Agostic Ethyl Group in Solution ([P2N2] = PhP(CH2SiMe2NSiMe2CH2)2PPh)” J. Am. Chem. Soc. 2001, 123, 1602-1612 http://pubs.acs.org/journals/jacsat/article.cgi/jacsat/2001/123/i17/pdf/ja0041371.pdf

8) Fryzuk, M. D.; Johnson, S. A. “The Continuing Story of Dinitrogen Activation” Coord. Chem. Rev. 2000, 200-202, 379-409 http://scholarsportal.info/cgi-bin/sciserv.pl?collection=journals&journal=00108545&issue=v200-202inone

7) Fryzuk, M. D.; Johnson, S. A.; Rettig, S. J. “Synthesis and Bonding in the Diamagnetic Dinuclear Tantalum(IV) Hydride Species ([P2N2]Ta)2(H)4 and the Paramagnetic Cationic Dinuclear Hydride Species {([P2N2]Ta)2(H)4}+I- ([P2N2] = PhP(CH2SiMe2NSiMe2CH2)2PPh): The Reducing Ability of a Metal-Metal Bond” Organometallics 2000, 19, 3931-3941 http://pubs.acs.org/journals/orgnd7/article.cgi/orgnd7/2000/19/i19/pdf/om000359w.pdf

6) Fryzuk, M. D.; Johnson, S. A.; Rettig, S. J. “Synthesis and Structure of the Tantalum Trimethyl Complex [P2N2]TaMe3 and Its Conversion to the Tantalum Methylidene Species [P2N2]Ta=CH2(Me) ([P2N2] = PhP(CH2SiMe2NSiMe2CH2)2PPh) Organometallics 1999, 18, 4059-4067 http://pubs.acs.org/journals/orgnd7/article.cgi/orgnd7/1999/18/i20/pdf/om990249t.pdf

5) Fryzuk, M. D.; Johnson, S. A.; Rettig, S. J. “New Mode of Coordination for the Dinitrogen Ligand: A Dinuclear Tantalum Complex with a Bridging N2 Unit That Is Both Side-On and End-On” J. Am. Chem. Soc. 1998, 120, 11024-11025 http://pubs.acs.org/journals/jacsat/article.cgi/jacsat/1998/120/i42/pdf/ja982377z.pdf

4) Fryzuk, M. D.; Giesbrecht, G. R.; Johnson, S. A.; Kickham, J. E.; Love, J. B. “Chelating Amides of Lithium. Synthesis, Structure and Coordination Chemistry” Polyhedron 1998, 17, 947-952 http://scholarsportal.info/cgi-bin/sciserv.pl?collection=journals&journal=02775387&issue=v17i5-6

3) Gillespie, R. J.; Johnson, S. A. “ A Study of Bond Angles and Bond Lengths in Disiloxane and Related Molecules in Terms of the Topology of the Electron Density and its Laplacian” Inorg. Chem. 1997, 36, 3031-3039 http://pubs.acs.org/journals/inocaj/article.cgi/inocaj/1997/36/i14/pdf/ic961381d.pdf

2) Robinson, R. A.; Johnson, S. A.; Tang, T-H; Gillespie, R. J. “Reinterpretation of the Lengths of Bonds to Fluorine in Terms of an Ionic Model: A Criticism of the Schomaker-Stevenson Equation and of the Back-Bonding Model” Inorg. Chem. 1997, 36, 3022-3030 http://pubs.acs.org/journals/inocaj/article.cgi/inocaj/1997/36/i14/pdf/ic961315b.pdf

1) Bader, R. F. W.; Johnson, S. A.; Tang, T-H; Popelier, P. L. A. “ The Electron Pair” J. Phys. Chem. 1996, 100, 15398-15415 http://pubs.acs.org/journals/jpchax/article.cgi/jpchax/1996/100/i38/pdf/jp961297j.pdf