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Ralf M. Haiges

Research Associate Professor of Chemistry and Administrator of the X-ray Crystallographic Facility

Office: LHI 106
Office Phone: (213) 740-8957
Lab Phone: (213) 821-5973
Fax: (213) 740-6679
Email: haiges@usc.edu
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Research Focus

 

We are highly interested in Green Energetic Materials (GEMs). There is an ever growing demand for environmentally benign and non-toxic energetic materials for storage and controlled release of energy. GEMs are energetic materials that are virtually free of environmental hazards and toxicity issues during the course of their production, storage, use, and disposal. Our general research interests range from inorganic main group chemistry, organo fluorine chemistry, polynitrogen and polyazido compounds, all the way to energy storage and material science. We are also very interested in X-ray crystallography, NMR spectroscopy, vibrational spectroscopy, and quantum mechanical calculations.

Typical examples of Prof. Haiges' research during the past several years include:

  1. Synthesis and structural characterization of over 40 new polyazido species like W(N3)6, [W(N3)7]-, [WN(N3)4]-, Mo(N3)6, [Mo(N3)7]-, [MoN(N3)4]-, V(N3)4, [V(N3)6]-, [V(N3)6]2-, Nb(N3)5, [Nb(N3)6]-, [Nb(N3)7]2-, Ta(N3)5, [Ta(N3)6]-, [Ta(N3)7]2-, Se(N3)4, [Se(N3)5]-, [Se(N3)6]2-, Te(N3)4, [Te(N3)5]-, and [Te(N3)6]2-.
  2. Preparation and characterization of the polynitrogen compounds [N5]B(N3)4],[N5][P(N3)6], [N5][HF2], [N5][PF6], [N5][BF4], [N5][SO3F], [N3NOF][SbF6], and [N7O][SbF6]. It is worth noting that the energetic-nitrogen content of [N5][B(N3)4] (95.7 weight %) is among the highest ever recorded for solid nitrogen compounds.
  3. Preparation of the first oxidizer-balanced energetic ionic liquid for liquid monopropellant applications.
  4. Convenient preparation of trifluoromethanol from commercially available starting materials for the synthesis of trifluormethyl ethers and esters.
  5. Development of a new signal processing method for NMR spectroscopy.
  6. The preparation of [SO3NF2]- by direct fluorination of [SO3NH2]-. The utility of NaSO3NF2 as an alternative source of difluoramine in organic difluoramination reactions was demonstrated by the transformation of carbonyl into gem-bis(difluoramino) groups.

References

 
List of Publications:

“Preparation and Characterization of the Binary Group 13 Azides Ga(N3)3, In(N3)3, Tl(N3)3, [Ga(N3)5]2-, [In(N3)6]3-, and [Tl(N3)6]3-“, R. Haiges, J. A. Boatz, K. O. Christe, forthcoming

· “Preparation and Characterization of the Binary Bismuth Azides Bi(N3)3, [Bi(N3)4]-, [Bi(N3)5]2-, and [Bi(N3)6]3-“, R. Haiges, D. Dixon, K. O. Christe, Angewandte Chemie International Edition 2010, forthcoming.

· “The Syntheses and Structure of the First Vanadium(IV) and Vanadium(V) Binary Azides, V(N3)4, [V(N3)6]2-, and [V(N3)6]-“, R. Haiges, J. A. Boatz, K. O. Christe, Angewandte Chemie International Edition 2010, early view.

· “Dinitrogen Difluoride Chemistry. Improved Syntheses of cis- and trans-N2F2, Synthesis and Characterization of N2F+Sn2F9-, Crystal Structure of N2F+Sb2F11- Containing an Ordered N2F+ Cation, and High-Level Electronic Structure Calculations”, Inorganic Chemistry 2010, 49, 6823.

· “Synthesis and Properties of N7O+”, K. O. Christe, R. Haiges, W. W. Wilson, J. A. Boatz, Inorganic Chemistry 2010, 49, 1245.

· “Sulfuryl and Thionyl Halide-Based Ultralow Temperature Primary Batteries”, W. West, A. Shevade, J. Soler, J. Kulleck, M. Smart, B. Ratnakumar, M. Moran, R. Haiges, K. Christe, G. Prakash, Journal of The Electrochemical Society 2010, 157, A571.

· “Binary Selenium(IV) Fluoride and Oxofluoride Anions”, T. M. Klapötke, B. Krumm, M. Scherr, R. Haiges, M. Hopfinger, D. A. Dixon, K. O. Christe, Journal of Fluorine Chemistry 2010, in press.

· “A Persistent ?-Fluorocarbanion and Its Analogues: Preparation, Characterization, and Computational Study”, G. K. S. Prakash, F. Wang, N. Shao, T. Mathew, G. Rasul, R. Haiges, T. Stewart, G. A. Olah, Angewandte Chemie International Edition 2009, 48, 5358.

· “Energetics and Mechanism of the Decomposition of Trifluoromethanol”, M. T. Nguyen, M. H. Matus, V. T. Ngan, R. Haiges, K. O. Christe, D. A. Dixon, Journal of Physical Chemistry A 2008, 112, 1298.

· “The Binary Selenium(IV) Azides Se(N3)4, Se(N3)5-, Se(N3)62- and the Molecular Structure of SeOF3-“, T. M. Klapötke, B. Krumm, M. Scherr, R. Haiges, K. O. Christe, Angewandte Chemie International Edition 2007, 46, 8686.

· “Convenient Access to Trifluoromethanol”, K. O. Christe, J. Hegge, B. Hoge, R. Haiges, Angewandte Chemie International Edition 2007, 46, 6155.

· “Synthesis and Characterization of (Z)-[N3NFO]+ and (E) -[N3NFO]+”, W. W. Wilson, R. Haiges, J. A. Boatz, K. O. Christe, Angewandte Chemie International Edition 2007, 46, 3023.

· “Monocapped Trigonal-Prismatic Transition-Metal Heptaazides: Syntheses, Properties, and Structures of [Nb(N3)7]2-, and [Ta(N3)7]2-“, R. Haiges, J. A. Boatz, M. Yousufuddin, K. O. Christe, Angewandte Chemie International Edition 2007, 46, 2869.

· “Synthesis and characterization of silyldichloramines, their reactions with F- ions, instability of N2Cl2 and NCl2-, and formation of NCl3”, S. Schneider, M. Gerken, R. Haiges, R. Schroer, J. A. Boatz, D. A. Dixon, K. O. Christe, Inorganic Chemistry, 2007, 46, 93.

· “Are the NF4+ cations in NF4BF4 really nontetrahedral?”, R. Haiges, M. Gerken, A. Iuga, R. Bau, K. O. Christe, Inorganic Chemistry 2006, 45, 7981.

· “Preparation, characterization, and crystal structures of the SO3NHF- and SO3NF2- ions”, R. Haiges, R. Wagner, J. A. Boatz, M. Etzkorn, G. K. S. Prakash, K. O. Christe, R. D. Chapman, M. E. Welker, C. B. Kreutzberger, Angewandte Chemie International Edition 2006, 45, 5179.

· “Oxygen-balanced energetic ionic liquid”, C. B. Jones, R. Haiges, T. Schroer, K. O. Christe, Angewandte Chemie International Edition 2006, 45, 4981.

· “Experimental evidence for linear metal-azido coordination: The binary Group 5 azides Nb(N3)5, Ta(N3)5, [Nb(N3)6]-, and [Ta(N3)6]- and 1:1 acetonitrile adducts [Nb(N3)5·CH3CN] and [Ta(N3)5·CH3CN]”, R. Haiges, J. A. Boatz, T. Schroer, M. Yousufuddin, K. O. Christe, Angewandte Chemie International Edition 2006, 45, 4830.

· “New signal processing method for the faster observation of natural-abundance 15N NMR spectra and its application to N5+”, S. D. Kunikeev, H. S. Taylor, T. Schroer, R. Haiges, C. B. Jones, K. O. Christe, Inorganic Chemistry 2006, 45, 437.

· “The syntheses and structures of Ph4EN3 (E = P, As, Sb), an example for the transition from ionic to covalent azides within the same main group”, R. Haiges, T. Schroer, M. Yousufuddin, K. O. Christe, Zeitschrift für Anorganische und Allgemeine Chemie 2005, 631, 2691.

· “Polyazide Chemistry: The first binary group 6 azides, Mo(N3)6, W(N3)6, [Mo(N3)7]-, and [W(N3)7]-, and the [NW(N3)4]- and [NMo(N3)4]- ions”, R. Haiges, J. A. Boatz, R. Bau, S. Schneider, T. Schroer, M. Yousufuddin, K. O. Christe, Angewandte Chemie International Edition 2005, 44, 1860.

· “The race for the first generation of the pentazolate anion in solution is far from over”, T. Schroer, R. Haiges, S. Schneider, K. O. Christe, Chemical Communications 2005, 1607. · “Polyazide Chemistry: Preparation and characterization of As(N3)5, Sb(N3)5, and [P(C6H5)4][Sb(N3)6]” R. Haiges, J. A. Boatz, A. Vij, V. Vij, M. Gerken, S. Schneider, T. Schroer, M. Yousufuddon, K. O. Christe, Angewandte Chemie International Edition 2004, 43, 6676.

· “The NH3Cl+ Cation”, S. Schneider, R. Haiges, T. Schroer, J. Boatz, K. O. Christe, Angewandte Chemie International Edition 2004, 43, 5213. · “New High Energy Density Materials: Synthesis and Characterization of N5+P(N3)6-, N5+B(N3)4-, N5+HF2-•nHF, N5+BF4-, N5+PF6-, and N5+SO3F-“, R. Haiges, S. Schneider, T. Schroer, K. O. Christe, Angewandte Chemie International Edition 2004, 43, 4919.

· “The First Binary Group 4 Azides [P(C6H5)4][Ti(N3)5] and [P(C6H5)4]2[Ti(N3)6] and on Linear Ti-N-NN Coordination”, R. Haiges, J. A. Boatz, S. Schneider, T. Schroer, M. Yousufuddin, K. O. Christe, Angewandte Chemie International Edition 2004, 43, 3148.

· “Methyl Tin(IV) Derivatives of HOTeF5 and HN(SO2CF3)2: A Solution Multinuclear NMR Study and the X-ray Crystal Structures of (CH3)2SnCl(OTeF5) and [(CH3)3Sn(H2O)2][N(SO2CF3)2]”, A. Vij, W. W. Wilson, V. Vij, R. C. Corley, F. S. Tham, M. Gerken, R. Haiges, S. Schneider, T. Schroer, R. I. Wagner, Inorganic Chemistry 2004, 10, 3189.

· “First Structural Characterization of Binary As(III) and Sb(III) Azides”, R. Haiges, A. Vij, J. A. Boatz, S. Schneider, T. Schroer, M. Gerken, K. O. Christe, Chemistry – A European Journal 2004, 10, 508.

· “Polyazide Chemistry. Preparation and Characterization of Te(N3)4 and [P(C6H5)4]2[Te(N3)6] and Evidence for [N(CH3)4][Te(N3)5]”, R. Haiges, J. A. Boatz, M. Gerken, S. Schneider, T. Schroer, K. O. Christe, Angewandte Chemie International Edition 2003, 42, 5847.

· “The (SO2)2N3- Anion”, K. O. Christe, M. Gerken, R. Haiges, S. Schneider, T. Schroer, Irena Tsyba, R. Bau, Inorganic Chemistry 2003, 42, 416.

· “Synthesis and Characterization of the SO2N3-, (SO2)2N3-, and SO3N3- Anions”, K. O. Christe, J. A. Boatz, M. Gerken, R. Haiges, S. Schneider, T. Schroer, F. S. Tham, A. Vij, V. Vij, R. I. Wagner, W. W. Wilson, Inorganic Chemistry 2002, 41, 4275.

· “Improved synthesis of CsN3”, M. Gerken, S. Schneider, T. Schroer, R. Haiges, K. O. Christe, Zeitschrift für Anorganische und Allgemeine Chemie 2002, 628, 909.

· “Tritylsulfinylamine: a new member in the family of sulfinylamines”, K. O. Christe, M. Gerken, R. Haiges, S. Schneider, T. Schroer, F. S. Tham, A. Vij, Solid State Sciences 2002, 4, 1529.

· “The 19F NMR shifts are not a measure for the nakedness of the fluoride anion”, M. Gerken, J. A. Boatz, A. Kornath, R. Haiges, S. Schneider, T. Schroer, K. O. Christe, Journal of Fluorine Chemistry 2002, 116, 49.

· “An Improved Method for Product Separation in Metathetical Reactions and its Demonstration for the Synthesis of Anhydrous Cesium Salts”, R. Haiges, K. O. Christe, Zeitschrift für Anorganische und Allgemeine Chemie 2002, 628, 1717.

· “Reactions of donor-free (CF3)2Cd with phosphorous(V) halides: Insertion of difluoro carbene and direct synthesis of (CF3)3PF2”, R. Eujen, R. Haiges, Zeitschrift für Naturforschung 1998, 53b, 1455.

(c) 2014 Loker Hydrocarbon Institute