Search results for: Paul Kögerler

Items from 1 to 20 out of 98 results

article

Controlled Hydrolysis of Phosphate Esters: A Route to Calixarene‐Supported Rare‐Earth Clusters

Marjan Hosseinzadeh, Sergio Sanz, Jan Leusen, Natalya V. Izarova, more

Chemistry – A European Journal > 29 > 13 > n/a - n/a

Phosphate ester bonds are widely present in nature (e. g. DNA/RNA) and can be extremely stable against hydrolysis without the help of catalysts. Previously, we showed how the combination of phosphoryl and calix[4]arene moieties in the same organic framework (L_PO) allows isolation of single lanthanide (Ln) metal ions as [Ln^III(L_PO)₂](O₃SCF₃)₃. Here we report how by controlling the reaction conditions...

article

Semiconductor Halogenation in Molecular Highly‐Oriented Layered p–n (n–p) Junctions

Iulia Cojocariu, Matteo Jugovac, Sidra Sarwar, Jeff Rawson, more

Advanced Functional Materials > 32 > 51 > n/a - n/a

Organic p–n junctions attract widespread interest in the field of molecular electronics because of their unique optoelectronic singularities. Importantly, the molecular donor/acceptor character is strongly correlated to the degree of substitution, e.g., the introduction of electron‐withdrawing groups. Herein, by gradually increasing the degree of peripheral fluorination on planar, D_4h−symmetric iron(II)...

article

Structural Phase Transitions and Magnetic Superexchange in M^IAg^IIF₃ Perovskites at High Pressure**

Łukasz Wolański, Marvin Metzelaars, Jan Leusen, Paul Kögerler, more

Chemistry – A European Journal > 28 > 30 > n/a - n/a

Pressure‐induced phase transitions of M^IAg^IIF₃ perovskites (M=K, Rb, Cs) have been predicted theoretically for the first time for pressures up to 100 GPa. The sequence of phase transitions for M=K and Rb consists of a transition from orthorhombic to monoclinic and back to orthorhombic, associated with progressive bending of infinite chains of corner‐sharing [AgF₆]⁴⁻ octahedra and their mutual approach...

article

Cover Feature: Structural Phase Transitions and Magnetic Superexchange in M^IAg^IIF₃ Perovskites at High Pressure (Chem. Eur. J. 30/2022)

Łukasz Wolański, Marvin Metzelaars, Jan Leusen, Paul Kögerler, more

Chemistry – A European Journal > 28 > 30 > n/a - n/a

DFT calculations predict that M^IAg^IIF₃ perovskites undergo a series of pressure‐induced phase transitions towards post‐perovskite phases. These transitions are associated with changes of the first coordination sphere of Ag^II and an increasing complexity of the [AgF₃] sublattice connectivity. Remarkably, the coordination number of the alkali metal ions decreases upon phase transitions. More information...

article

Rb₃Er₄Cu₅Te₁₀: Exploring the Frontier between Polar Intermetallics and Zintl‐Phases via Experimental and Quantumchemical Approaches

Fabian C. Gladisch, Jan Leusen, Marco T. Passia, Paul Kögerler, more

European Journal of Inorganic Chemistry > 2021 > 47 > 4946 - 4953

The tailored design of solid‐state materials requires a proper understanding of their respective electronic structures. In order to rationalize the relationships between crystal structures and electronic structures in intermetallic compounds, the Zintl‐Klemm concept has been frequently employed. Yet, the frontier between the valence‐electron concentrations (e/a) of the Zintl‐ and the polar intermetallic...

article

Mn²⁺ substitution within the {V₁₄As₈} polyoxovanadate archetype results in {Mn₂V₁₂As₈} shells with trans‐positioned heterometal positions

Maren Rasmussen, Christian Näther, Paul Kögerler, Wolfgang Bensch

Zeitschrift für anorganische und allgemeine Chemie > 647 > 22 > 2098 - 2104

Solvothermal exploration of the As, V, Mn reaction system in the presence of aqueous diethylenetriamine (=dien) solution led to the discovery of [Mn^II₄V^IV₁₂As^III₈O₄₀(dien)₄(H₂O)] ⋅ 3.5H₂O, containing the first arsenato‐polyoxovanadate featuring a {Mn₂V₁₂As₈O₄₀} cluster shell. In comparison to its parental {V₁₄As₈O₄₂} archetype, two vanadyl (VO²⁺) units at opposite ends of the polyoxovanadate shell...

article

Front Cover: Mn²⁺ substitution within the {V₁₄As₈} polyoxovanadate archetype results in {Mn₂V₁₂As₈} shells with trans‐positioned heterometal positions (Z. Anorg. Allg. Chem. 22/2021)

Maren Rasmussen, Christian Näther, Paul Kögerler, Wolfgang Bensch

Zeitschrift für anorganische und allgemeine Chemie > 647 > 22 > 1997 - 1997

The cover picture shows the core fragments of the {Mn₂V₁₂As₈O₄₀} cluster, which forms as [Mn^II₄V^IV₁₂As^III₈O₄₀(dien)₄(H₂O)]⋅3.5H₂O under solvothermal conditions. Starting with the well‐known α‐{V₁₄As₈O₄₂} cluster, two trans‐postioned square‐pyramidal VO₅ groups are exchanged by two unusual MnNO₅ moieties. In the crystal lattice, the {Mn₂V₁₂As₈} shell is further covalently expanded into a {Mn₆V₁₂As₈...

article

Trigonal Prismatic Coordination of Discrete Rare Earth Ions, Enforced by the Polyoxotungstate [P₄W₂₇O₉₉(H₂O)]^16–

Tuba Iftikhar, Natalya V. Izarova, Jan Leusen, Paul Kögerler

Chemistry – A European Journal > 27 > 53 > 13376 - 13383

A family of solution‐stable polyanions [Na⊂{Ln^III(H₂O)}{W^VIO(H₂O)}P^V₄W^VI₂₆O₉₈]¹²⁻ (Ln=Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y) represent the first examples of polyoxometalates comprising a single lanthanide(III) or yttrium(III) ion in a rare trigonal prismatic O₆ environment. Their synthesis exploits the reactivity of the organophosphonate‐functionalized precursor [P₄W₂₄O₉₂(C₆H₅P^VO)₂]¹⁶⁻ with...

article

Polyoxotungstate Archetype {P₄W₂₇} and its 3d Derivatives

Tuba Iftikhar, Natalya V. Izarova, Jan Leusen, Paul Kögerler

Chemistry – A European Journal > 27 > 33 > 8500 - 8508

The propensity of the new, phenylphosphonate‐stabilized polyoxotungstate [(C₆H₅P^VO)₂P₄W₂₄O₉₂]¹⁶⁻ to act as a precursor for new 3d metal‐functionalized polyanions has been investigated. Reactions with Mn^II and Cu^II induce the formation of the previously unknown polyoxotungstate archetype {P₄W₂₇}, isolated as salts of the polyanions [Na⊂{Mn^II(H₂O)}{WO(H₂O)}P₄W₂₆O₉₈]¹³⁻ (1) and [K⊂{Cu^II(H₂O)}{W(OH)(H...

article

Magnetic Phase Transitions in a Ni₄O₄‐Cubane‐Based Metal–Organic Framework

Muhammad Arif Nadeem, Maggie Chai Cin Ng, Jan Leusen, Paul Kögerler, more

Chemistry – A European Journal > 26 > 34 > 7589 - 7594

An unprecedented spin cluster‐based network architecture {[Ni^II₂(pdaa)(OH)₂(H₂O)]_n (H₂pdaa=1,4‐phenylene diacetic acid)}, comprising 1D linear chains of Ni^II ions crosslinked via Ni₄O₄ cubanes, forms under hydrothermal conditions; this 3D coordination network exhibits magnetic ordering at 23.9 K as well as a second magnetic ordering process at 2.8 K likely associated with a structural phase transition.

article

Cover Feature: Magnetic Phase Transitions in a Ni₄O₄‐Cubane‐Based Metal–Organic Framework (Chem. Eur. J. 34/2020)

Muhammad Arif Nadeem, Maggie Chai Cin Ng, Jan Leusen, Paul Kögerler, more

Chemistry – A European Journal > 26 > 34 > 7512 - 7512

Four eyes see more than two: Operando EPR, XANES/EXAFS, ATR‐IR, and UV/Vis spectroscopy have been coupled in the same experiment to complete the mechanistic puzzle in selective aerobic alcohol oxidation by a copper‐TEMPO catalyst. The reaction is driven by a single Cu^I/Cu^II redox cA remarkable Ni₄O₄–cubane‐based coordination framework has been shown to display unusual low‐temperature magnetic behavior...

article

[Mn(terpy)Sb₂S₄]_n, a 1D Network of MnSb₄S₅ Rings Exhibiting a Pronounced Magnetocaloric Effect and Luminescence

Felix Danker, Carolin Anderer, Michael Poschmann, Huayna Terraschke, more

European Journal of Inorganic Chemistry > 2020 > 18 > 1751 - 1758

The solvothermal reaction of an aqueous solution of Na₃SbS₃ or Schlippe's Salt (Na₃SbS₄·9H₂O) in the presence of Mn(ClO₄)₂·6H₂O and terpy (terpy = 2,2':6',2''‐terpyridine) or the [Mn(terpy)]²⁺ complex led to crystallization of the new compound [Mn(terpy)Sb₂S₄]_n (I). The unique crystal structure of I features chains formed by fused MnSb₄S₅ rings. The Mn²⁺ cation is coordinated by one terpy ligand and...

article

Amine‐Functionalized Spin Crossover Building Blocks

Henrik Flötotto, Tim Secker, Paul Kögerler, Claire Besson

European Journal of Inorganic Chemistry > 2019 > 43 > 4621 - 4624

Bistable spin crossover complexes such as [Fe{HB(pz)₃}₂] (pzH = pyrazole) show promise for sensor applications and electrically‐controlled data storage units, but exploiting their potential hinges on their integration into a functional environment. We here present a system enabling such covalent post‐functionalization steps in both symmetric and asymmetric patterns, based on the amine‐functionalized...

article

Amine‐Functionalized Spin Crossover Building Blocks

Henrik Flötotto, Tim Secker, Paul Kögerler, Claire Besson

European Journal of Inorganic Chemistry > 2019 > 43 > 4606 - 4606

Invited for the cover of this issue is the group of Paul Kögerler from RWTH Aachen University, Germany. The cover image shows an aluminum sheet painted with thermochromic lacquer based on functionalized derivatives of iron(II) bis(tris(pyrazolyl)borate) complexes.

article

Front Cover: Amine‐Functionalized Spin Crossover Building Blocks (Eur. J. Inorg. Chem. 43/2019)

Henrik Flötotto, Tim Secker, Paul Kögerler, Claire Besson

European Journal of Inorganic Chemistry > 2019 > 43 > 4605 - 4605

The Front Cover shows an aluminum sheet painted with thermochromic lacquer based on functionalized derivatives of a traditional spin‐crossover staple, namely iron(II) bis(tris(pyrazolyl)borate) complexes. Facile, controlled pyrazole metathesis allows us to introduce various functional groups, exemplified here by three nitro derivatives. This enables a slew of post‐reactions, ranging from reduction...

article

Ultrasound‐Assisted Formation of {Fe₆Ln/Y₄} Wheel‐Shaped Clusters and Condensed {Fe₄Ln/Y₂} Aggregates

Olga Botezat, Jan van Leusen, Paul Kögerler, Svetlana G. Baca

European Journal of Inorganic Chemistry > 2019 > 16 > 2236 - 2244

Two families of charge‐neutral heterometallic Fe‐4f coordination compounds comprising isobutyrate and amino alcoholate linkers were found to form exclusively upon ultrasonication irradiation. Under one‐pot conditions, the trinuclear precursor [Fe₃O(O₂CCHMe₂)₆(H₂O)₃](NO₃)·2(MeCN)·2(H₂O) reacts with Ln(NO₃)₃·xH₂O or Y(NO₃)₃·6H₂O, N‐butyldiethanolamine (bdeaH₂) and NaN₃ in methanol to yield the decanuclear...

article

Borohydride as Magnetic Superexchange Pathway in Late Lanthanide Borohydrides

Wojciech Wegner, Jan van Leusen, Jacek Majewski, Wojciech Grochala, more

European Journal of Inorganic Chemistry > 2019 > 13 > 1776 - 1783

The magnetic characteristics of a series of borohydride‐based systems, including binary α‐/β‐Ln(BH₄)₃ phases (Ln = Gd, Tb, Dy, Ho, Er, and Tm) with direct Ln–HBH–Ln bridges and selected mixed‐metal systems, LiYb(BH₄)₄, NaYb(BH₄)₄, KHo(BH₄)₄, RbTm(BH₄)₄, with isolated Ln³⁺ ions embedded in [Ln(BH₄)₄]^– anions are described for the first time using SQUID magnetometry and DFT+U calculations. Crystal field...

article

Ion‐Directed Coordinative Polymerization of Copper(II) Pyridyl‐Alcohol Complexes Through Thiane Functionalities

Sebastian Schmitz, Natalya V. Izarova, Claire Besson, Jan van Leusen, more

Zeitschrift für anorganische und allgemeine Chemie > 645 > 4 > 409 - 415

A mononuclear complex [Cu(HL·S)₂(NO₃)₂] (1) and a one‐ dimensional coordination polymer [Cu(HL·S)Cl₂]_n (2) [HL·S = 4‐(pyridin‐2‐ylmethyl)tetrahydro‐2H‐thiopyran‐4‐ol] showcase the structure‐directing role of the counterions in their formation reaction: monodentate ligation of NO₃^– and Cl^– induces an octahedral (with two HL·S per Cu in 1) or trigonal‐bipyramidal (with one HL·S per Cu in 2) Cu^II coordination...

article

Cover Feature: Ion‐Directed Coordinative Polymerization of Copper(II) Pyridyl‐Alcohol Complexes Through Thiane Functionalities (Z. Anorg. Allg. Chem. 4/2019)

Sebastian Schmitz, Natalya V. Izarova, Claire Besson, Jan van Leusen, more

Zeitschrift für anorganische und allgemeine Chemie > 645 > 4 > 397 - 397

This cover picture shows, in the background, the mining process from ore to pure elemental sulfur (middle left) and copper (middle right). These two elements can be employed to form a variety of discrete and polymeric structures exhibiting soft S···S and strong Cu–S bonds, as seen here for copper(II) complexes comprising thiane moieties in their pyridyl‐alcohol ligands. More details are discussed...

article

Polyoxopalladates as Prototype Molecular Hydrogen Uptake Systems and Novel In situ Hydrogen Detectors on the Nanoscale

Carolin Schmitz‐Antoniak, Natalya V. Izarova, Nataliya Svechkina, Alevtina Smekhova, more

European Journal of Inorganic Chemistry > 2019 > 3-4 > 448 - 455

Dodecapalladium(II) oxide‐based molecular nanocubes encapsulating Fe³⁺ (3d⁵) or Co²⁺ (3d⁷) ions display facile hydrogen uptake with concurrent pronounced magnetization changes that suggests use as molecular hydrogen detection materials. Electronic and magnetic properties were investigated element‐specifically by X‐ray absorption spectroscopy and its associated magnetic circular and linear dichroisms...

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Search results for: Paul Kögerler

Controlled Hydrolysis of Phosphate Esters: A Route to Calixarene‐Supported Rare‐Earth Clusters

Semiconductor Halogenation in Molecular Highly‐Oriented Layered p–n (n–p) Junctions

Structural Phase Transitions and Magnetic Superexchange in M^IAg^IIF₃ Perovskites at High Pressure**

Cover Feature: Structural Phase Transitions and Magnetic Superexchange in M^IAg^IIF₃ Perovskites at High Pressure (Chem. Eur. J. 30/2022)

Rb₃Er₄Cu₅Te₁₀: Exploring the Frontier between Polar Intermetallics and Zintl‐Phases via Experimental and Quantumchemical Approaches

Mn²⁺ substitution within the {V₁₄As₈} polyoxovanadate archetype results in {Mn₂V₁₂As₈} shells with trans‐positioned heterometal positions

Front Cover: Mn²⁺ substitution within the {V₁₄As₈} polyoxovanadate archetype results in {Mn₂V₁₂As₈} shells with trans‐positioned heterometal positions (Z. Anorg. Allg. Chem. 22/2021)

Trigonal Prismatic Coordination of Discrete Rare Earth Ions, Enforced by the Polyoxotungstate [P₄W₂₇O₉₉(H₂O)]^16–

Polyoxotungstate Archetype {P₄W₂₇} and its 3d Derivatives

Magnetic Phase Transitions in a Ni₄O₄‐Cubane‐Based Metal–Organic Framework

Cover Feature: Magnetic Phase Transitions in a Ni₄O₄‐Cubane‐Based Metal–Organic Framework (Chem. Eur. J. 34/2020)

[Mn(terpy)Sb₂S₄]_n, a 1D Network of MnSb₄S₅ Rings Exhibiting a Pronounced Magnetocaloric Effect and Luminescence

Amine‐Functionalized Spin Crossover Building Blocks

Amine‐Functionalized Spin Crossover Building Blocks

Front Cover: Amine‐Functionalized Spin Crossover Building Blocks (Eur. J. Inorg. Chem. 43/2019)

Ultrasound‐Assisted Formation of {Fe₆Ln/Y₄} Wheel‐Shaped Clusters and Condensed {Fe₄Ln/Y₂} Aggregates

Borohydride as Magnetic Superexchange Pathway in Late Lanthanide Borohydrides

Ion‐Directed Coordinative Polymerization of Copper(II) Pyridyl‐Alcohol Complexes Through Thiane Functionalities

Cover Feature: Ion‐Directed Coordinative Polymerization of Copper(II) Pyridyl‐Alcohol Complexes Through Thiane Functionalities (Z. Anorg. Allg. Chem. 4/2019)

Polyoxopalladates as Prototype Molecular Hydrogen Uptake Systems and Novel In situ Hydrogen Detectors on the Nanoscale

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