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Angelo State University
Department of Chemistry and Biochemistry

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Dr. Ralph A. Zehnder

  • Ralph Zehnder
    Ralph Zehnder
    Danny Meyer, Photographer

Department of Chemistry and Biochemistry

Associate Professor
  • Postdoctoral: Los Alamos National Laboratory (2003-2005)
  • Ph.D., (2003) University of Siegen, Siegen Germany
  • M.S., (1999) University of Siegen, Siegen German

General Chemistry I&II - CHEM 1311/1111 & 1312/1112

Descriptive Inorganic Chemistry - CHEM 3301

  1. My research interests target the field of f-element chemistry with a focus on the lanthanide elements. This research area is expected to provide more insight into the complex nature of the f-elements in general, which commonly allows conclusions to be drawn for the actinide elements in particular. Actinide chemistry is a relatively young but very important field in the natural sciences, and a great deal of research in this area remains to be done. Some of the trans-plutonium actinides and the lanthanides exhibit great similarities in their chemistry due to their preferred occurrence in the trivalent oxidation state and their closely related ionic radii. Therefore, it has been common practice to utilize the lanthanide elements as surrogates for the radioactive actinide elements in basic research. This approach bears the great advantage that this type of work can be done without the strict safety requirements for work with radioactive material that are met only at a limited number of institutions. New insight gained in the lanthanide and actinide science arena may have implications for the advancement of nuclear fuel reprocessing, the long term sequestration and storage of spent nuclear fuel, and solving technical challenges in nuclear chemistry.
  1. Conversion of Lanthanide Glutarate Chlorides with Interstitial THF into Lanthanide Glutarates with unprecedented Topologies, Zehnder, R.A.; Jenkins, J.; Zeller, M.; Dempsey, C.; Kozimor, S.A.; Jackson, G.; Gilbert, K.; Smith, M.; Inorg. Chim. Acta 2018, 471, 502−512
  2. Stress Compensation in an extended Series of Lanthanide Sulfonatoterephthalates [Ln(TPSO3)(H2O)2]n (Ln = Ce – Lu, except Pm), Hernandez, A.; Jenkins, J.; Maslen, H.; Horner, G.; Zeller, M.; Dempsey, C.; Urteaga, J.; Zehnder, R.A.; Inorg. Chim. Acta 2018, 471, 104−112
  3. Network Dimensionality of Selected Uranyl(VI) Coordination Polymers and Octopus like Uranium(IV) Clusters, Zehnder, R.A.; Boncella, J.M.; Cross, J.N.; Kozimor, S.A.; Monreal, M.J.; La Pierre, H.S.; Scott, B.L.; Tondreau, A.M.; Zeller, M; Cryst. Growth Des. 2017, 17, 5568−5582
  4. Strain Alleviation in an Isomorphous Series of Lanthanide 2-nitroterephthalates [Ln2(TPNO2)3(H2O)2]•2H2O (Ln = Pr – Lu, except Pm), Zehnder, R.A.; Fontaine, N.; Mouawad, B.A.; Leonard, J.K.; Zeller, M.; Fronczek, F.R.; de Lill, D.T.; Ballard, A.; Bonnette, D.;* Head, A.; Ghimire, K.; Welch, J.N.; Barber, E.R.; Murray, J.M.; Dempsey, C.; Jenkins, J.; Jackson, G.; Tokunboh, M.; Bach, S.R.; Treadway Harris, J.R.; Inorg. Chim. Acta 2017, 467, 276–286
  5. Covalency in Lanthanides. An X‑ray Absorption Spectroscopy and Density Functional Study of LnCl6bx− (x = 3, 2), Löble, M.W.; Keith, J.M.; Altman, A.B.;bStieber, S.C.E.; Batista, E.R.; Boland, K.S.; Conradson, S.D.; Clark, D.L.;bPacheco, J.L.; Kozimor, S.A.; Martin, R.L.; Minasian, S.G.; Olson, A.C.; Scott B.L.; Shuh, D.K.; Tyliszczak, T.; Wilkerson, M.P.; Zehnder, R.A.; J. Am. Chem. Soc. 2015, 137, (7), 2506–2523

Presentations

  1. Southwest Regional ACS Meeting, Lubbock, TX, USA, October 30, 2017 Lanthanide Glutarate Sulfoterephthalates James Jenkins,# Matthias Zeller, Gregory Jackson,# Harry Maslen,Christian Dempsey,# and Ralph A. Zehnder
  2. Southwest Regional ACS Meeting, Lubbock, TX, USA, October 30, 2017 New lanthanide coordination polymers functionalized with sulfo and hydroxy groups Harry Maslen,# James Jenkins,# Adrian Hernandez,# Garrett Horner,Jeffrey Urteaga,# Christian Dempsey,# Matthias Zeller, and Ralph A. Zehnder
  3. Southwest Regional ACS Meeting, Galveston, TX, USA, November 11, 2016 New lanthanide coordin. polymers functionalized with sulfo and hydroxyl groups Adrian Hernandez#, Garrett Horner#, Jeffrey Urteaga#, Christian Dempsey#, Katherine Gilbert#, Luke Jordan#, Matthias Zeller, and Ralph A. Zehnder
  4. Southwest Regional ACS Meeting, Galveston, TX, USA, November 11, 2016 Lanthanide glutarate chlorides with interstitial THF; Intermediates on the route to lanthanide open frameworks? James Jenkins#, Christian Dempsey#, Gregory Jackson#, Matthias Zeller, and Ralph A. Zehnder
  5. Southwest Regional ACS Meeting, Galveston, TX, USA, November 11, 2016 New lanthanide terephthalate coordination polymers functionalized with nitro and bromo groups Katherine Gilbert#, Luke Jordan#, Matthew Smith#, Matthias Zeller, and Ralph A. Zehnder