Dr. Stefanie G?rtner

Studies on alkali metal trielides ATr (A=Na, K, Rb, Cs; Tr=In, Tl)

Almost 90 years after the first description of the NaTl structure, the Zintl-Klemm concept occupies a central position in the description of intermetallic compounds consisting of the combination of an electropositive metal with elements to the right of the Zintl line (between groups 13 and 14 in the PSE). Interestingly, the element on which this concept is based, thallium, is located to the left of the Zintl line.

The oldest characterised Zintl phase is cubic sodium thallide, which was characterised by Zintl himself in very careful investigations using the methods possible at the time. Combinations of electropositive metals with thallium (thallides) can be understood as border crossers between classical intermetallic compounds and Zintl phases. As a heavy group 13 element to the left of the Zintl line, no classical polyanionic salts are to be expected here, but significant Tl-Tl interactions nevertheless appear to play a role in structure formation. In addition to isolated clusters, two- and three-dimensional networks are found, depending on the proportion and type of electropositive metal involved. In some cases, the thallium substructures formed can be explained using the classic Zintl-Klemm concept with formal transfer of the valence electrons of the electropositive element to thallium. In some cases, however, this description fails and the resulting compounds can be categorised as classical intermetallic compounds.

The aim of this project is to expand the structural chemistry of the elements thallium and indium in formally negative oxidation states. Special emphasis will be placed on the role of alkali metals in structure formation. When synthesising the compounds, we therefore usually use several alkali metals at the same time. The crystal structures provide a more precise insight into their contribution to structure formation.

Front Cover: Synthesis and characterization of ternary trielides Na7KTr4 [Tr=In or Tl] including [Tr4]8- tetrahedra M. Janesch, V.F. Schwinghammer, I.G. Shenderovich, S. G?rtner, Z. Anorg.? ? ? Allg. Chem., 649,?e202300211.? DOI:?10.1002/zaac.202300211

Front Cover: Investigations on Tetragonally Distorted Sodium Thallide NaTl‐tI8 S. Tiefenthaler, M. Schlosser, F. Pielnhofer, I. G. Shenderovich, A. Pfitzner, S. G?rtner, Z. Anorg. Allg. Chem. 646, 77-77 (2020).? ? ? ? ? ??DOI:10.1002/zaac.202070031?

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  Approaching Hypothetical RbTl in Experiments and Theory – X-ray Structure Determination of Cs_1–xRb_xTl (x = 0.18, 0.42) and a Solid Solution K_1–xRb_xTl (x ≤ 0.69)

V.F. Schwinghammer, S.A. Khan, S.M. Tiefenthaler,?Tomá? Ková?ík, Ján Minár, S. G?rtner, Inorg. Chem. 64, 14, 6879-6887 (2025). DOI:?10.1021/acs.inorgchem.4c05305

• [Tl7]7- Clusters in Mixed Alkali Metal Thallides Cs7.29K5.71Tl13 and Cs3.45K3.55

V.F. Schwinghammer, S. G?rtner, Inorg. Chem. 63, 43, 20078-20082 (2024), DOI:?10.1021/acs.inorgchem.3c04034

• Synthesis and characterization of ternary trielides Na7KTr4 [Tr=In or Tl] icluding [Tl4]8- Tetrahedra

M. Janesch, V.F. Schwinghammer, I.G. Shenderovich, S. G?rtner, Z. Anorg. Allg. Chem., 2023, e202300112.?DOI: 10.1002/zaac.202300112

• Na7RbTl4 — A New Ternary Zintl Phase Containing [Tl4]8– Tetrahedra

V.F. Schwinghammer, M. Janesch, N. Korber, S. G?rtner, Z. Anorg. Allg. Chem.,? 2022, e202200332. DOI:?10.1002/zaac.202200332

• Single Crystal X-Ray Structure Analyses of Binary and Ternary Compounds A49Tl108+x (A=K, Rb, Cs; x=0-1.76) Related to the K49Tl108 Type Structure

V.F. Schwinghammer, M. Janesch, F. Kleemiss, S. G?rtner, Z. Anorg. Allg. Chem.?648, 1-7 (2022)??DOI: 10.1002/zaac.202200117

• The Role of Different Alkali Metals in the?A15Tl27?Type Structure and the Synthesis and X-ray Structure Analysis of a New Substitutional Variant?Cs14.53Tl28.4?? ? ? ?

V.F. Schwinghammer, S.M. Tiefenthaler, S. G?rtner, Materials 14, 7512 (2021)? ? ?DOI: 10.3390/ma14247512

• Spotlight on Alkali Metals: The Structural Chemistry of Alkali Metal Thallides

S. G?rtner, Crystals 10, 1013 (2020) DOI: 10.3390/cryst10111013

• ?Investigations on Tetragonally Distorted Sodium Thallide NaTl‐tI8
  S. Tiefenthaler, M. Schlosser, F. Pielnhofer, I. G. Shenderovich, A. Pfitzner, S. G?rtner, Z. Anorg. Allg. Chem. 646, 82 (2020) DOI:10.1002/zaac.201900269

• Synthesis of the Tetragonal Phase of Zintl’s NaTl and Its Structure Determination from Powder Diffraction Data
  S. Tiefenthaler, N. Korber, S. G?rtner, Materials?12, 1356 (2019) DOI:10.3390/ma12081356

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  Elusive Zintl Ions [μ HSi?]?? and [Si?]?? in Liquid Ammonia: Protonation States, Sites, and Bonding Situation by NMR and Theory
  F. Hastreiter, C. Lorenz, J. Hioe, S. G?rtner, L. Nanjundappa, N. Korber, R. M. Gschwind, Angew. Chem. 58, 3133 (2019) DOI:10.1002/anie.201812955

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  Structural Chemistry of Halide including Thallides A₈Tl₁₁X_1?n? (A = K, Rb, Cs; X = Cl, Br; n = 0.1–0.9)

  S. G?rtner, S. Tiefenthaler, N. Korber, S. Stempfhuber, B. Hischa, Crystals 8, 319 (2018) DOI:10.3390/cryst8080319

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  Single Crystal X-ray Structure Analyses of Thallides: Halide Incorporation and Mixed Alkali Sites in A₈Tl₁₁X (A = K, Rb, Cs; X = Cl, Br)

  S. G?rtner, S. Tiefenthaler, Proceedings 2, 1124 (2018) DOI:10.3390/IECC_2018-05259

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  Structure of [HSi?]?? in Solid State and Its Unexpectedly High Dynamics in Solution
  C. Lorenz, F. Hastreiter, J. Hioe, L. Nanjundappa, S. G?rtner, N. Korber, R. M. Gschwind, Angew. Chem.?130, 13138 (2018) DOI:10.1002/ange.201807080

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  Ammoniates of Zintl Phases: Similarities and Differences of Binary Phases A?E? and Their Corresponding Solvates
  C. Lorenz, S. G?rtner, N. Korber, Crystals?8, 276 (2018) DOI:10.3390/cryst8070276

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  Dinuclear indium and thallium diyls: biscarbenoids or metal cluster?
  M. Desat, S. Gaertner, R. Kretschmer, Chem.Commun. 53, 1510-1513 (2017)
  DOI:10.1039/C6CC09488K

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  Si??? in Solution - First Solvate Crystal Structure of the Ligand-?free Tetrasilicide Tetraanion in Rb?.?K?.?Si? ? 7 NH?
  C. Lorenz, S. Gaertner, N. Korber, Z. Anorg. Allg. Chem. 643, 141-145 (2017)
  DOI:10.1002/zaac.201600336

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  Selective P4 Activation by a Highly Reduced Cobaltate: Synthesis of Dicobalt Tetraphosphido Complexes
  S. Pelties, T. Maier, D. Herrmann, B. de Bruin, C.? Rebreyend, S. Gaertner, I. G. Shenderovich, R. Wolf,? Chem. Eur. J. 23, 6094-6102 (2017)
  DOI:10.1002/chem.201603296

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  Co-?crystallization of Half-?sandwich (RM,?RC)?/(SM,?RC)?-?Diastereomers in Single Crystals
  H. Brunner, T. Tsuno, M. Bodensteiner, S. Gaertner, C. Miyahara, S.? Ito, T. Kurosawa, K. Koyama, Eur. J. Inorg. Chem. 2016, 5405-5410 (2016)
  DOI:10.1002/ejic.201600962

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  The first chelate-free crystal structure of a silicide transition metal complex K?.??Rb?.??[Si?Ni(CO)?]??16NH?
  S. G?rtner, M. Hamberger, N. Korber, Crystals?5, 275-282 (2015) DOI:10.3390/cryst5030275

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  Stability and Conversion of Tin Zintl Anions in Liquid Ammonia Investigated by NMR Spectroscopy
  F. Fendt, C. Koch, M. Neumeier, S. G?rtner, R. M. Gschwind, N. Korber, Chem. Eur. J.?21, 14539-14544 (2015) DOI:10.1002/chem.201501100

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  About the polymorphism of [Li(C?H?O)?]I: crystal structures of trigonal and tetragonal polymorphs
  S. G?rtner, T. G?rtner, R. M. Gschwind, N. Korber, Acta Cryst.?E70, 555-558 (2014) DOI:10.1107/S160053681402529X

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  Coordination preferences of the alkali cations sodium and caesium in the mixed-cationic Zintl ammoniate Cs?.?Na?.?Ge?·5.3NH?
  S. G?rtner, C. Suchentrunk, N. Korber, Acta Crystallogr.?C70, 1036-1039 (2014) DOI:10.1107/S2053229614021998

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  Reaction of Sn??? in liquid ammonia: the formation of Rb?[(η?-Sn?)Zn(η?-Sn?)]·5NH?
  F. Fendt, C. Koch, S. G?rtner, N. Korber, Dalton Trans.?42, 15548-15550 (2013) DOI:10.1039/C3DT51932E

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  Zintl Anions S. G?rtner, N. Korber, in: K. Poeppelmeier (Ed.), J. Reedijk (Ed.), Main-Group Elements, Comprehensive Inorganic Chemistry II (Second Edition)?1, Elsevier Ltd., Amsterdam Oxford Waltham (2013) S. 251-267; ISBN 978-0-08-096529-1 DOI:10.1016/B978-0-08-097774-4.00110-8

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  NMR-spektroskopische Detektion der schwer zu fassenden hochgeladenen Zintl-Ionen Si??? und Sn??? in flüssigem Ammoniak
  M. Neumeier, F. Fendt, S. G?rtner, C. Koch, T. G?rtner, N. Korber, R. M. Gschwind, Angew. Chem. 125, 4579-4582 (2013) DOI:10.1002/ange.201209578

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  [Rb(18-crown-6)][Rb([2.2.2]-cryptand)]Rb?Sn?·5NH?
  S. G?rtner, N. Korber, Acta Crystallogr.?E67, m613-m614 (2011) DOI:10.1107/S1600536811013997

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  Polyanions of group 14 and Group 15 elements in alkali and alkaline earth metal solid state compounds and solvate structures S. G?rtner, N. Korber, in: T. F. F?ssler (Ed.), Zintl Ions, Structure and Bonding?140, Springer, Berlin Heidelberg (2011) S. 25-57; ISBN 978-3-642-21180-5 DOI:10.1007/430_2011_43

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  Dissolving Silicides: Syntheses and Crystal Structures of New Ammoniates Containing Si??? and Si??? Polyanions and the Role of Ammonia of Crystallisation
  S. Joseph, C. Suchentrunk, N. Korber, Z. Naturforsch. 65b, 1059-1065 (2010)

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  Chemie mit substituentenfreien Silicium-Clustern in L?sung – ein ?bergangsmetallkomplex eines Polysilicid-Anions
  S. Joseph, M. Hamberger, F. Mutzbauer, O. H?rtl, M. Meier, N. Korber, Angew. Chem. 121, 8926-8929 (2009) DOI:10.1002/ange.200904242

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  Si??? Anions in Solution - Structures of the Solvates Rb?Si?·4.75NH? and [Rb(18-crown-6)]Rb?Si??4NH?, and Chemical Bonding in Si???
  S. Joseph, C. Suchentrunk, F. Kraus, N. Korber, Eur. J. Inorg. Chem., 4641-4647 (2009) DOI:10.1002/ejic.200900230

58. H?mds?rmelkolloquium (H?Ko-2025) in Innsbruck

On Wednesday, February 26, 2025, parts of the AK Korbers (Paul, Michael) and AG G?rtners (Steffi, Vanessa, Matthias, Jan) took the train to Innsbruck for the 58th H?Ko. For two and a half days there were many exciting lectures and our master students got to know many people from the community. On Wednesday evening, the Innsbruckers hosted a get-together where both savory and sweet dishes were served. On Thursday morning, we were treated to some sunshine, so we took a short tour of the city on our way to the CCB building. Of course, we couldn't miss the Golden Roof.

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After the work was done, there was a conference dinner in the evening, which was accompanied by a brass band including harp and accordion. It felt like being at home :)

The last day started almost immediately with Steffi's talk on golden trielides, in which she presented Melissa and Vanessa's latest results on alkali metal trielides with gold. At noon we unfortunately left the beautiful and sunny Innsbruck by train or Flixbus in the direction of gray Germany.

New master students for AK Korber and AG G?rtner

In January and February, three SynCat students started at AK Korber and AG G?rtner for their master thesis.?

Welcome to the working group Jan, Matthias and Kajetan!

22nd Conference on Inorganic Chemistry by GDCH divisions of Inorganic Chemistry (W?hler-Vereinigung) and Solid-State Chemistry & Materials Research (Festk?rperchemie und Materialforschung)

From the 16.-18th of september the 22nd Conference on Inorganic Chemistry took place at the TUM Research Center in Garching. Together with the two members of AK Korber, Paul and Michael, we joint this conference, where we met old and new friends. While Steffi held a speech on tuesday, we four PhDs presented each our poster on monday or tuesday in the evening. After three days full with interessting talks, the conference ended with the social evening in the AUGUSTINER STAMMHAUS in Munich.

Visit from AK Hoch

On 6th of august four members of the AK Hoch including Tino visited us for the exchange of samples and some new learned techniques. As a surprise also Jan Minár joined our meeting. So the bosses could chat about different topics, while we PhDs worked in the lab. In the afternoon the session was relocated to the castle in Donaustauf and to Steffi?s garden, where she and her husband provided us with food and drinks. That's how we ended the official part in the evening.

Award for Stefanie G?rtner

Steffi was one of three outstanding female academics to be honoured with the Maria Weber Grant from the Hans B?ckler Foundation.

Pressemitteilung Uni Regensurg