Search results for: Kevin Lamberts

Items from 1 to 8 out of 8 results

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Unravelling Local Atomic Order of the Anionic Sublattice in M(Al_1−xGa_x)₄ with M=Sr and Ba by Using NMR Spectroscopy and Quantum Mechanical Modelling

Oliver Pecher, Bernhard Mausolf, Volker Peters, Kevin Lamberts, more

Chemistry – A European Journal > 22 > 49 > 17833 - 17842

The quasibinary section of the intermetallic phases MAl₄ and MGa₄ with M=Sr and Ba have been characterised by means of X‐ray diffraction (XRD) studies and differential thermal analysis. The binary phases show complete miscibility and form solid solutions M(Al_1−xGa_x)₄ with M=Sr and Ba. These structures crystallise in the BaAl₄ structure type with four‐ and five‐bonded Al and/or Ga atoms (denoted as...

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Alkoxide bridged Copper(II) Hinokitiolato and Tropolonato Complexes: Polymorphism, Reconstructive Phase Transition, and Magnetic Properties

Silvia Schnitzler, Kevin Lamberts, Manfred Speldrich, Paul Kögerler, more

Zeitschrift für anorganische und allgemeine Chemie > 642 > 3 > 222 - 230

Polymorphism and an unexpected reconstructive phase transition in [Cu(trop)(μ‐OMe)]₂ (trop = tropolonate) were studied by single crystal and powder X‐ray diffraction; the phase transition is associated with a huge hysteresis of ca. 200 °C. In the readily reproducible crystal form, the methoxide‐bridged dinuclear subunits aggregate to infinite chains by longer bonds in the Jahn‐Teller distorted coordination...

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Inside Cover: The Solid Solution Sr_1−xBa_xGa₂: Substitutional Disorder and Chemical Bonding Visited by NMR Spectroscopy and Quantum Mechanical Calculations (Chem. Eur. J. 40/2015)

Oliver Pecher, Bernhard Mausolf, Kevin Lamberts, Dirk Oligschläger, more

Chemistry – A European Journal > 21 > 40 > 13826 - 13826

By combining solid‐state synthesis with elaborate experimental and theoretical techniques, F. Haarmann and co‐workers, in their Full Paper on page 13971 ff., have examined intermetallic phases. The combined application of X‐ray diffraction, solid‐state NMR spectroscopy, and density functional theory (DFT) offers insights into the local atomic environments. Synthesis of Sr_1−xBa_xGa₂ solid solution samples...

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The Solid Solution Sr_1−xBa_xGa₂: Substitutional Disorder and Chemical Bonding Visited by NMR Spectroscopy and Quantum Mechanical Calculations

Oliver Pecher, Bernhard Mausolf, Kevin Lamberts, Dirk Oligschläger, more

Chemistry – A European Journal > 21 > 40 > 13971 - 13982

Complete miscibility of the intermetallic phases (IPs) SrGa₂ and BaGa₂ forming the solid solution Sr_1−xBa_xGa₂ is shown by means of X‐ray diffraction, thermoanalytical and metallographic studies. Regarding the distances of Sr/Ba sites versus substitution degree, a model of isolated substitution centres (ISC) for up to 10 % cation substitution is explored to study the influence on the Ga bonding situation...

article

One‐ and two‐dimensional polymers from proline and calcium bromide

Kevin Lamberts, Mihaela‐Diana Şerb, Ulli Englert

Acta Crystallographica Section C > 71 > 4 > 311 - 317

Reactions of calcium bromide with enantiopure and racemic proline in aqueous solution lead to two solids in which the zwitterionic amino acid acts as a bridging ligand between neighbouring cations. Depending on the chirality of the amino acid, topologically very different products are obtained. With racemic proline, bromide acts as a simple uncoordinated counter‐anion for the cationic heterochiral...

article

Unexpected proline coordination in the copper chain polymer [Cu(μ‐Cl)₂(μ‐DL‐proline‐κ²O:O′)]¹_∞

Kevin Lamberts, Mihaela‐Diana Şerb, Ulli Englert

Acta Crystallographica Section C > 71 > 4 > 271 - 275

In catena‐poly[copper(II)‐di‐μ‐chlorido‐μ‐proline‐κ²O:O′], [CuCl₂(C₅H₉NO₂)]_n, two symmetry‐independent metal cations adopt distorted octahedral coordination, typical for d⁹ Jahn–Teller systems. Each chloride bridge is involved in both a short and a very long interaction with a Cu^II centre. The centrosymmetric crystal structure contains homochiral chains of opposite handedness which extend along the...

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Enantiopure and racemic alanine as bridging ligands in Ca and Mn chain polymers

Kevin Lamberts, Andreas Möller, Ulli Englert

Acta Crystallographica Section B > 70 > 6 > 989 - 998

Under accelerated and controlled evaporation, chain polymers crystallize from aqueous solutions of Ca^II and Mn^II halides with enantiopure L‐alanine or racemic DL‐alanine. In all ten solids thus obtained zwitterionic amino acid ligands bridge neighbouring cations. The exclusively O‐donor‐based coordination sphere around the metal cations is completed by aqua ligands; the halides remain uncoordinated...

article

Structures from MnX₂ and proline: isomorphous racemic compounds and a series of chiral non‐isomorphous chain polymers

Kevin Lamberts, Ulli Englert

Acta Crystallographica Section B > 68 > 6 > 610 - 618

Reactions of manganese(II) chloride, bromide and iodide with proline as an enantiopure and racemic ligand result in six crystalline solids for which diffraction experiments have been performed at 100 K. For two of these compounds, crystal structures at ambient temperature had been reported previously. The most surprising outcome of our systematic comparison lies in the role of chirality: with enantiopure...

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Keywords

BRIDGING LIGANDS (3)
CHEMICAL BONDING (3)
INTERMETALLIC PHASES (3)
NMR SPECTROSCOPY (3)
QUANTUM MECHANICAL CALCULATIONS (3)
SUBSTITUTIONAL DISORDER (3)
CHIRALITY (2)
CRYSTAL STRUCTURE (2)
RACEMIC COMPOUNDS (2)
CALCIUM BROMIDE (1)
CALCIUM POLYMER (1)
CHAIN POLYMERS (1)
COORDINATION POLYMERS (1)
COPPER (1)
DL‐PROLINE (1)
HINOKITIOLATO COMPLEXES (1)
ISOMORPHOUS MONONUCLEAR COMPLEXES (1)
MINERALOGY (1)
ONE‐DIMENSIONAL CHAIN POLYMER (1)
ONE‐DIMENSIONAL COORDINATION POLYMER (1)
POLYMORPHISM (1)
STRUCTURAL SCHEMATICS (1)
TROPOLONATO COMPLEXES (1)
TWO‐DIMENSIONAL NETWORK (1)
ZWITTERIONIC PROLINE (1)
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