Prof. Dr. Gerd Meyer

Inorganic Chemistry: Solid State
and Coordination Chemistry
Synthesis, Structures (Powder and
Single Crystal X-ray diffraction),
Thermal Analysis / Mass Spectrometry,
Spectroscopy (Absorption:
NIR-VIS-UV, FT-IR, Raman; Emission);
Magnetism

Tel.: (+49)221 470 3262
Fax: (+49)221 470 5083

E-Mail: gerd.meyer@uni-koeln.de
http://www.gerdmeyer.de

 

  • Born 1949 at Schadeck (Hessen, Germany)
  • Diplom in Chemistry 1972 (Justus-Liebig-Universität Gießen)
  • Dr. rer. nat. 1976 (Justus-Liebig-Universität Gießen):
    „Beiträge zur Chemie ternärer Oxide der Alkalimetalle mit leichten und schweren Übergangsmetallen“ mit einem Anhang über „Effektive Koordinationszahlen, ECoN, ein einfaches Hilfsmittel bei der Beschreibung und Charakterisierung von Kristallstrukturen“
  • Postdoc with Professor John D. Corbett, Iowa State University, Ames, Iowa, USA, 1980
  • Habilitation 1982 (Justus-Liebig-Universität Gießen):
    „Beiträge zur Synthese und Kristallchemie der komplexen Halogenide“
  • Akademischer Rat 1977-1988 (Justus-Liebig-Universität Gießen)
  • Privat-Dozent 1982-1988 (Justus-Liebig-Universität Gießen)
  • Professor (C4) 1988-1996 (Universität Hannover)
  • Professor (C4) 1996- (Universität zu Köln)

Awards

  • Preis der Justus-Liebig-Universität Gießen 1987
  • Carl-Duisberg-Gedächtnispreis of the German Chemical Society (GDCh) 1987
  • Gold Medal of the University of Wroclaw (Poland) 2000
  • Terrae Rarae Award 2005

Services

  • Dean of the Chemistry Department 1990-1996 (Universität Hannover)
  • Coordinator of the Special Programme "Reactivity of Solids" of the Deutsche Forschungsgemeinschaft (DFG) 1997-2002
  • Chairman of the Board of the "Fachgruppe Chemieunterricht" of the German Chemical Society (GDCh) 2001-2003
  • Chairman of "Konferenz der Fachbereiche Chemie" (KFC) in Germany, 2004-2006
  • Vice-Chairman of the "Mathematisch-Naturwissenschaftlicher Fakultätentag" (MNFT) in Germany, 2005-2006, Chairman 2006-
  • Member of the Board of ChemCologne e.V., 2004-
  • Member of the "Kuratorium" of the Kurt-Hansen-Stiftung, 2003-

Collaborations

  • Prof. John D. Corbett, Iowa State University, Ames IA, USA
  • Prof. Janusz Drozdzynski and Prof. Janina Legendziewicz, University of Wroclaw, Poland
  • Prof. Glen B. Deacon, Monash University, Clayton, Victoria, Australia
  • Prof. Hans-U. Güdel, Universität Bern, Switzerland
  • Prof. Koen Binnemans, Universiteit Leuven, Belgium
  • Prof. Alexandru Cecal, University of Iasi, Romania
  • Dr. Otilia Costisor, Romanian Academy of Sciences, Timisoara, Romania

Dissertations

  • So far 58 Dr. rer. nat. degrees were granted under my supervision:
    5 from Justus-Liebig-Universität Gießen
    30 from Universität Hannover
    23 from Universität zu Köln
  • At present, 6 graduate students are working under my direct supervision on their dissertations. They will finish in 2006/07.
  • In 2006, 7 students will start with experimental work for their Dr. rer. nat. dissertation.
  • Seven young researchers have, so far, earned their Habilitation with me: Dr. H.-Jürgen Meyer (Hannover 1992; Prof. C3 at Tübingen), Dr. Thomas Schleid (Hannover 1993; Prof. C3 at Stuttgart), Dr. Mathias S. Wickleder (Köln 2000; Prof. W2 at Oldenburg), Dr. Angela Möller (Köln, 2001), Dr. Claudia Wickleder (Köln 2003; Prof. C3 at Siegen), Dr. Klaus Müller-Buschbaum (Köln 2004), Dr. Anja-Verena Mudring (Köln 2006; Prof. W2 at Bochum).

Support from

The States of

  • Hessen (Justus-Liebig-Universität Gießen), 1971-1988
  • Niedersachsen (Universität Hannover), 1988-1996
  • Nordrhein-Westfalen (Universität zu Köln), 1996-

Deutsche Forschungsgemeinschaft

  • Normalverfahren (since 1977)
  • Schwerpunktprogramme:
    "Neue Phänomene in der Chemie metallischer Elemente mit abgeschlossenen inneren Elektronen-zuständen"
    "Kristallstruktur, Realbau, Gefüge und Eigenschaften von anorganischen nichtmetallischen Materialien"
    " Ungewöhnliche Valenzzustände in Festkörpern"
    "Reaktivität von Festkörpern"
    "Lanthanoidspezifische Funktionalitäten"
  • Sonderforschungsbereiche
    173 Hannover: "Lokale Teilchenbewegung, Transport und chemische Reaktion in Ionenkristallen"
    608 Köln: "Komplexe Übergangsmetallverbindungen mit Spin- und Ladungsfreiheitsgraden und Unordnung"
  • Graduiertenkollegs
    Köln: "Phasenumwandlungen"
    Köln: "Azentrische Kristalle"

Federal Minister of Education and Research (BMBF)

Projects on

  • Neutron Diffraction (nuclear and magnetic structures)
  • Luminescence Materials for Mercury-free VUV Lamps

Fonds der Chemischen Industrie

Diverse Projects in Collaboration with Chemical Industry


Research

The only transport mechanism for the reaction of two ionic solids is diffusion of ions. This affords long reaction times and high temperatures. Enhanced reactivities are possible through mobile phases, for example through convective transport or in solutions and melts, respectively.
Ammonium halides, (NH4)X, are substances that dissociate into their components NH3 and HX dependent upon temperature which makes them mobile. The ammonium ion, (NH4)+, itself is a versatile reagent because it may react, subject to its constituents H+, NH3, NH2-, NH2- and N3- as an acid or oxidant as well as base or reductant, respectively. For example, the reaction of gallium metal with (NH4)F or (NH4)HF2 produces single crystals of, e.g., Ga(NH3)F3 and Ga(NH3)2F3 as well as Ga(NH3)(NH2)F2, substances that play an important role in the ammonolysis of (NH4)3GaF6 yielding GaN. Under similar conditions, iron reacts with (NH4)Br to [Fe(NH3)6]3[Fe8Br14], a complex salt whose anion contains monovalent iron (Fig. 1)!


Also, when Hg-N bonds are to be tied, NH3 and (NH4)+ play an important role: Dependent upon the concentration of NH3/(NH4)+ and temperature, compounds like (NH4)[Hg3(NH)2](NO3)3 or the anhydrous nitrate of Millon’s base, [Hg2N](NO3), are obtained. Hg-N bonds are also formed in reactions of mercuric halides with N-heterocycles. The ligand 3,5-dimethyl-4’-amino-1,2,4-triazole and HgCl2 form an adduct as shown in Fig. 2 and caffeine a complex as shown in Fig. 3. Closed-shell d10 cations (Hg2+ and Ag+) where relativistic effects play a more or less important role, are systematically tested for their affinity towards N-donor compounds, mostly heterocycles, and compared with other important transition metal cations such as Ni2+ (d8), Co2+/Co3+, and Mn2+ (d5).
Nitrogen is also known to act as an interstitial atom in many clusters such as the new Ba[Ce4N2]I8. Such compounds are obtained via the metallothermic reduction of rare-earth halides with alkali or alkaline-earth metals when educts are used that are contaminated with ammonium halides. The action of barium on pure LaI3 yields BaLaI4 which contains chains of face-sharing square antiprisms [LaI8/2]. Under equal conditions barium reacts with PrI3 forming Ba6Pr3I19 which contains the new trimers Pr3I16 (Fig. 4) with two excess electrons per trimer.

Another frequent interstitial atom in rare-earth halide cluster chemistry is carbon, either as single atoms or as dicarbon units. An exceptional example is mono-carbon in tetrahedral interstices in the supertetrahedral cluster Sc24C10I30 (Fig. 5).

Books

  • "Allgemeine und Anorganische Chemie" (two volumes), H.R. Christen, G. Meyer, Salle + Sauerländer (1994).
  • "Grundlagen der Allgemeinen und Anorganischen Chemie", H.R. Christen, G. Meyer, Salle + Sauerländer (1997).
  • "Inorganic Chemistry Highlights", G. Meyer, D. Naumann, L. Wesemann (co-editors), Wiley-VCH (2002).
  • "Inorganic Chemistry in Focus", G. Meyer, D. Naumann, L. Wesemann (co-editors), Wiley-VCH. Vol. II, 2005; Vol. III, 2006.
  • Co-Editor of the Textbook Series on "Inorganic Chemistry", Wiley (8 volumes, 1993 to present)

Review Articles

  1. "The Synthesis and Structures of Complex Rare-Earth Halides" — G. Meyer, Prog. Solid State Chem. 1982, 14, 141-219.
  2. "Reduced Halides of the Rare-Earth Elements"— G. Meyer, Chem. Rev. 1988, 88, 93-107.
  3. "Thermal behaviour of complex halides" — G. Meyer, Eur. J. Solid State Inorg. Chem. 1991, 28, 1209-1243.
  4. "Unusual Valences in Rare-Earth Halides" — G. Meyer, H,-J. Meyer, Chem. Mater. 1992, 4, 1157-1168.
  5. "The Ammonium Ion for Inorganic Synthesis" — G. Meyer, Adv. Synth. React. Solids 1994, 2, 1-26.
  6. "The Alkali-Poor Part of the Pseudoternary Triangle AX/ BX2/MX3: Crystal Structures, Properties, and Potentials of (Alkali)/Alkaline-Earth/ Rare-Earth Chloride Materials" — G. Meyer, S. Masselmann, Chem. Mater. 1998, 10, 2994-3004.
  7. "Simple and Complex (Rare Earth) Halides" — G. Meyer, M.S. Wickleder, Handbook on the Physics and Chemistry of Rare Earths 2000, 28, 53-129.
  8. "Affinity of Divalent Mercury Towards Nitrogen Donor Ligands" — G. Meyer, Z. Anorg. Allg. Chem. 2003, 629, 147-1461.

 

Selected Articles

200.

Marcus Simon, Gerd Meyer: The Oxidation of Tantalum with Ammonium Chloride as an Example of a Novel Route to Early Transition Metal-Nitrogen Cluster Compounds. Synthesis and Crystal Structure of (NH4)6[Ta5(NH)4Cl17], J. Chem. Soc., Chem. Comm.. 1993, 460-461.
210.

Gerd Meyer, Stefan Uhrlandt: Der erste trigonal-bipyramidale Cluster mit interstitieller C2-Hantel in [Rb{Pr5(C2)}Cl10], Angew. Chem. 1993, 105, 1379-1381; Angew. Chem. Int. Ed. Engl. 1993, 32, 1318-1319.
222.

Dirk J. Hinz, Gerd Meyer: Synthesis and Crystal Structure of the First Titanium Halide with Isolated Octahedral Clusters, [Ti6C]Cl14, J. Chem. Soc., Chem. Comm.1994, 125-126.
241.

Dirk J. Hinz, Gerd Meyer, Thorsten Dedecke, Werner Urland: Na2Ti3Cl8: von isolierten Ti2+-Ionen zu [Ti3]6+-Clustern!, Angew. Chem. 1995, 107, 97-99; Angew. Chem. Int. Ed. Engl. 1995, 34, 71-73.
281.

Christian Plitzko, Gerd Meyer: Synthese und Kristallstrukturen von NH4[Si(NH3)F5] und [Si(NH3)2F4], Z. Anorg. Allg. Chem. 1996, 622, 1646 - 1650.
295.

Carsten Runschke, Gerd Meyer: Synthese und Kristallstruktur des monomeren „in-cavity“-Komplexes [SmI3(Dibenzo-18-Krone-6)], Z. Anorg. Allg. Chem. 1997, 623, 981-984.
346.
 Meike Roos, Gerd Meyer: Das Monoammoniakat des Galliumamidfluorids: Ga(NH3)(NH2)F2 , Z. Anorg. Allg. Chem. 1999, 625, 1839-1842.
361.
 Meike Roos, Jörg Wittrock, Gerd Meyer, Silvia Fritz, Joachim Strähle: Abläufe der Ammonolysen der Ammoniumhexafluorometallate des Aluminiums, Galliums und Indiums, (NH4)3MF6 (M = Al,Ga,In), Z. Anorg. Allg. Chem. 2000, 626, 1179-1185.
362.
 Glen B. Deacon, Gerd Meyer, Dirk Stellfeldt: Syntheses and Structures of Bis(aryloxo)fluoroytterbium(III) Complexes, [Yb(OAr)2F(THF)]2 (OAr = OC6H2-2,6-tBu2-4-R; R = H,Me,tBu), and Bis(cyclopentadienyl)fluoroytterbium(III) Complexes, [YbCp2F]3, [Yb(MeCp)2F]4, [YbCp2F(OPPh3)]2, and [Yb(MeCp)2F(THF)]2, Eur. J. Inorg. Chem. 2000, 1061-1071.
363.
 Gerd Meyer, Norbert Böhmer: Korrosion von Messing und Bronze durch Ammoniumhalogenide, Z. Anorg. Allg. Chem. 2000, 626, 1332-1334.
415.
Dirk Göbbels, Gerd Meyer: Aufbau und Abbau von (NH4)[BF4] und H3N-BF3, Z. Anorg. Allg. Chem. 2002, 628, 1799-1805.
420.
 Peter Nockemann, Gerd Meyer: Bildung von NH4[Hg3(NH)2](NO3)3 und Umwandlung in [Hg2N](NO3), Z. Anorg. Allg. Chem. 2002, 628, 2709-2714.
441.
 Stephan Bremm, Gerd Meyer: Reactivity of Ammonium Halides: Action of Ammonium Chloride and Bromide on Iron and Iron(III) Chloride and Bromide, Z. Anorg. Allg. Chem. 2003, 629, 1875-1880.
445.
 Peter Nockemann, Ulrich Cremer, Uwe Ruschewitz, Gerd Meyer: Mercurous Azide, Hg2(N3)2, Z. Anorg. Allg. Chem. 2003, 629, 2079-2082.
450.
 Liesbet Jongen, Anja-Verena Mudring, Angela Möller, Gerd Meyer:
Ein Titan-Quadrat mit zentralem Sauerstoffatom, eingebettet in ein Iod-Kuboktaeder in dem Salz K4[{Ti4O}I12], Angew. Chem. 2004, 116, 3245-3248.
An Oxygen-Centered Titanium Square Embedded in a Cuboctahedron of Iodine in the Salt K4[{Ti4O}I12], Angew. Chem. Int. Ed. Engl. 2004, 43, 3183-3185.
459.

Gerd Meyer, Niels Gerlitzki, Stefanie Hammerich: Rare-earth diiodides and derivatives, J. Alloys Compd. 2004, 380, 71-78.
460.
 Niels Gerlitzki, Gerd Meyer, Anja-Verena Mudring, John D. Corbett: Praseodymium diiodide, PrI2, revisited by synthesis, structure determination and theory, J. Alloys Compd. 2004, 380, 211-218.
469.
 Niels Gerlitzki, Anja-Verena Mudring, Gerd Meyer: Ba6Pr3I19: Linear [Pr3I16] Trimers with Two Excess Electrons in a Three-Centre–Two-Electron Bond, Z. Anorg. Allg. Chem. 2005, 631, 381-384.
470.
 Gerd Meyer, Liesbet Jongen, Anja-Verena Mudring, Angela Möller: Divalent Scandium, Inorg. Chem. in Focus 2005, 2, 105-120.
484.
 R. Rückamp, J. Baier, M. Kriener, M.W. Haverkort, T. Lorenz, G.S. Uhrig, L. Jongen, A. Möller, Gerd Meyer, M. Grüninger: Zero-Field Incommensurate Spin-Peierls Phase with Interchain Frustration in TiOCl, Phys. Rev. Lett. 2005, 95, 097203-1-4.
500.
 Liesbet Jongen, Anja-Verena Mudring, Gerd Meyer: Der molekulare Festkörper Sc24C10I30: ein unvollständiges, hohles T4-Iod-Supertetraeder, aufgefüllt mit einem T3-Scandium-Supertetraeder, das das adamantoide Sc4C10 einschließt, Angew. Chem. 2006, 118, 1920-1923; The Molecular Solid Sc24C10I30: A Truncated Hollow T4 Supertetrahedron of Iodine Stuffed with a T3 Supertetrahedron of Scandium that Encapsulates the Adamantoid Cluster Sc4C10, Angew. Chem. Int. Ed. Engl. 2006, 45, 1886-1889.
502.
 Stefanie Hammerich, Ingo Pantenburg, Gerd Meyer: The First Mixed-Valent Europium(II,III) Oxide Bromide: Eu2O2Br, Z. Anorg. Allg. Chem. 2006, 632, 1487-1490.
505.
 Gerd Meyer, Andriy Palasyuk: Forty-five Years of Praseodymium Di-iodide, PrI2, Inorg. Chem. in Focus (G. Meyer, D. Naumann, L. Wesemann, eds.), Wiley-VCH, Weinheim, 2006, 3, 45-60.
509.
 Sonia Gomez Torres, Ingo Pantenburg, Gerd Meyer: Direct Oxidation of Europium Metal with Acetic Acid: Anhydrous Europium(III) Acetate, Eu(OAc)3, its Sesquihydrate, Eu(OAc)3(H2O)1.5, and the “Hydrogendiacetate”, [Eu(H(OAc)2)3](H2O), Z. Anorg. Allg. Chem. 2006, 632, 1989-1994.
511.
 Stefanie Hammerich, Ingo Pantenburg, Gerd Meyer: The Elusive Tetrasamarium-oxide-hexabromide, Sm4OBr6, Z. Anorg. Allg. Chem. 2006, 632, 2181-2183.

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