Search results for: Stephan Schulz

Items from 1 to 20 out of 196 results

article

From Neutral Diarsenes to Diarsene Radical Ions and Diarsene Dications

Hanns Micha Weinert, Christoph Wölper, Aleksa Radović, George E. Cutsail, more

Chemistry – A European Journal > 30 > 25 > n/a - n/a

Diarsene [L(MeO)GaAs]₂ (L=HC[C(Me)N(Ar)]₂, Ar=2,6‐ⁱPr₂C₆H₃, 4) reacts with MeOTf and ^MeNHC (^MeNHC=1,3,4,5‐tetra‐methylimidazol‐2‐ylidene) to the diarsene [L(TfO)GaAs]₂ (5) and the carbene‐coordinated diarsene [L(MeO)GaAsAs(^MeNHC)Ga(OMe)L] (6). The NHC‐coordination results in an inversion of the redox properties of the diarsene 4, which shows only a reversible reduction event at E_1/2=−2.06 V vs Fc^0/+1...

article

Gallaphosphene L(Cl)GaPGaL: A novel phosphinidene transfer reagent

Mahendra K. Sharma, Hanns M. Weinert, Christoph Wölper, Stephan Schulz

Chemistry – A European Journal > 30 > 18 > n/a - n/a

Gallaphosphene L(Cl)GaPGaL 1 (L=HC[C(Me)N(Ar)]₂; Ar=2,6‐iPr₂C₆H₃) reacts with N‐heterocyclic carbenes ^RNHC (^RNHC=[CMeN(R)]₂C; R=Me, iPr) to ^RNHC‐coordinated phosphinidenes ^RNHC→PGa(Cl)L (R=Me 2 a, iPr 2 b) and with isonitriles RNC (R=iPr, Cy) to 1,3‐phosphaazaallenes L(Cl)GaP=C=N−R (R=iPr 3 a, Cy 3 b), respectively. Quantum chemical calculations reveal that 2 a/2 b possess two localized lone pair...

article

Cyclic Alkyl(amino) Carbene‐Induced Rearrangement of Ga‐Phosphaketene

Bin Li, Christoph Wölper, Hanns Micha Weinert, Hannah Siera, more

European Journal of Inorganic Chemistry > 27 > 7 > n/a - n/a

Reactions of LGa(Cl)P(cAAC) (L=HC[C(Me)N(2,6‐iPr₂C₆H₃)]₂, ^MecAAC (^MecAAC=1‐(2,6‐di‐iso‐propylphenyl)‐3,3,5,5‐tetramethyl‐pyrrolidin‐2‐ylidene) with NaPCO and NaN₃ gave LGa(PCO)P(^MecAAC) (1) and LGa(N₃)P(^MecAAC) (2), respectively. DFT calculations on the nature of compounds 1 and 2 reveal a phosphaalkene rather than a carbene‐phosphinidene structure. The reaction of 1 with ^MecAAC resulted in a nucleophilic...

article

Syntheses and Structures of 5‐Membered Heterocycles Featuring 1,2‐Diphospha‐1,3‐Butadiene and Its Radical Anion

Mahendra K. Sharma, Hanns M. Weinert, Bin Li, Christoph Wölper, more

Angewandte Chemie > 135 > 40 > n/a - n/a

LGa(P₂OC)cAAC 2 features a 1,2‐diphospha‐1,3‐butadiene unit with a delocalized π‐type HOMO and a π*‐type LUMO according to DFT calculations. [LGa(P₂OC)cAAC][K(DB‐18‐c‐6)] 3[K(DB‐18‐c‐6] containing the 1,2‐diphospha‐1,3‐butadiene radical anion 3⋅⁻ was isolated from the reaction of 2 with KC₈ and dibenzo‐18‐crown‐6. 3 reacted with [Fc][B(C₆F₅)₄] (Fc=ferrocenium) to 2 and with TEMPO to [L^−HGa(P₂OC)cAAC][K(DB‐18‐c‐6)]...

article

Syntheses and Structures of 5‐Membered Heterocycles Featuring 1,2‐Diphospha‐1,3‐Butadiene and Its Radical Anion

Mahendra K. Sharma, Hanns M. Weinert, Bin Li, Christoph Wölper, more

Angewandte Chemie International Edition > 62 > 40 > n/a - n/a

article

Sjoerd Harder: a true ambassador of main group chemistry

Stephan Schulz, Christian Müller

Zeitschrift für anorganische und allgemeine Chemie > 649 > 9-10 > n/a - n/a

article

Density‐Dependence of Surface Transport in Tellurium‐Enriched Nanograined Bulk Bi₂Te₃

Sepideh Izadi, Ahana Bhattacharya, Sarah Salloum, Jeong Woo Han, more

Small > 19 > 11 > n/a - n/a

Three‐dimensional topological insulators (3D TI) exhibit conventional parabolic bulk bands and protected Dirac surface states. A thorough investigation of the different transport channels provided by the bulk and surface carriers using macroscopic samples may provide a path toward accessing superior surface transport properties. Bi₂Te₃ materials make promising 3D TI models; however, due to their complicated...

article

Crystal Plane‐Related Oxygen‐Evolution Activity of Single Hexagonal Co₃O₄ Spinel Particles

Swapnil Varhade, Emmanuel Batsa Tetteh, Sascha Saddeler, Simon Schumacher, more

Chemistry – A European Journal > 29 > 12 > n/a - n/a

The electrocatalytic activity for the oxygen evolution reaction in alkaline electrolyte of hexagonal spinel Co₃O₄ nanoparticles derived using scanning electrochemical cell microscopy (SECCM) is correlated with scanning electron microscopy and atomic force microscopy images of the droplet landing sites. A unique way to deconvolute the intrinsic catalytic activity of individual crystal facets of the...

article

C−Br Bond Activation of Bromoalkanes with Gallanediyl LGa

Bin Li, Christoph Wölper, Stephan Schulz

Zeitschrift für anorganische und allgemeine Chemie > 649 > 4 > n/a - n/a

Monovalent group 13 diyls are promising reagents for C−X bond activation. We here report on C−Br bond activation reactions of gallanediyl LGa (L=HC[C(Me)NAr)]₂, Ar=2,6‐i‐Pr₂C₆H₃)) with a variety of bromoalkanes. Reactions with alkylbromides R−Br gave the corresponding LGa(Br)R (R=Et 1, n‐Pr 2, i‐Pr 3), while the reaction with dibromomethane in 2 : 1 molar ratio occurred with geminal C−Br bond addition...

article

Einzelpartikel‐Elektrochemie belegt die dynamische Transformation von Cu₂O und Co₃O₄ während der Tandemkatalyse zur Umwandlung von NO₃⁻ in NH₃

Jian Zhang, Wenhui He, Thomas Quast, João R. C. Junqueira, more

Angewandte Chemie > 135 > 8 > n/a - n/a

Die elektrochemische Umwandlung von Nitrat in Ammoniak ist ein wichtiger und nachhaltiger Ansatz zur Wiederherstellung des weltweit gestörten Stickstoffkreislaufs. Die rationale Entwicklung von Katalysatoren für die Nitratreduktionsreaktion (NO₃RR) auf der Grundlage eines detaillierten Verständnisses des Reaktionsmechanismus ist von großer Bedeutung. Wir berichten über einen Cu₂O+Co₃O₄‐Tandemkatalysator,...

article

Single‐entity Electrochemistry Unveils Dynamic Transformation during Tandem Catalysis of Cu₂O and Co₃O₄ for Converting NO₃⁻ to NH₃

Jian Zhang, Wenhui He, Thomas Quast, João R. C. Junqueira, more

Angewandte Chemie International Edition > 62 > 8 > n/a - n/a

Electrochemically converting nitrate to ammonia is an essential and sustainable approach to restoring the globally perturbed nitrogen cycle. The rational design of catalysts for the nitrate reduction reaction (NO₃RR) based on a detailed understanding of the reaction mechanism is of high significance. We report a Cu₂O+Co₃O₄ tandem catalyst which enhances the NH₃ production rate by ≈2.7‐fold compared...

article

Small‐Molecule Activation by Heteroleptic Metallasilylenes

Juliane Schoening, Christoph Wölper, Stephan Schulz

European Journal of Inorganic Chemistry > 26 > 2 > n/a - n/a

We report on reactions of heteroleptic metallasilylenes L¹(Cl)MSiL² (M=Al 1, Ga 2, L¹=HC[C(Me)NDipp]₂, Dipp=2,6‐ⁱPr₂C₆H₃; L²=PhC(N^tBu)₂) with CO₂, N₂O, and Me₃SiN₃, yielding the corresponding carbonate complexes L¹(Cl)MOSi(CO₃‐κ²O,O−)L² (M=Al 3, Ga 4), silanoic esters L¹(Cl)MOSi(O)L² (M=Al 5, Ga 6), and silaimine L¹(Cl)GaSi(NSiMe₃)L² (8), whereas {L²Si[N(SiMe₃)Al(Cl)C(Me)NDipp][CHC(Me)N(Dipp)]} 7...

article

Front Cover: Small‐Molecule Activation by Heteroleptic Metallasilylenes (Eur. J. Inorg. Chem. 2/2023)

Juliane Schoening, Christoph Wölper, Stephan Schulz

European Journal of Inorganic Chemistry > 26 > 2 > n/a - n/a

The Front Cover illustrates the outcome of selected small molecule activation reactions using heteroleptic metallasilylenes L¹(Cl)MSiL², which are represented by the basic cards. By adding a “reACTION card”, displaying the small molecules CO₂, N₂O, or Me₃SiN₃, on top of a basic card, the corresponding “product cards”, which symbolize the resulting carbonate complexes, silanoic esters, and silaimine,...

article

Cover Feature: Selective [2+1+1] Fragmentation of P₄ by heteroleptic Metallasilylenes (Chem. Eur. J. 41/2022)

Juliane Schoening, Alexander Gehlhaar, Christoph Wölper, Stephan Schulz

Chemistry – A European Journal > 28 > 41 > n/a - n/a

Bond activation: An unprecedented [2+1+1] fragmentation of the P4 tetrahedron and formation of an eight‐membered M−P=Si−P=P−Si=P−M chain was achieved in reactions of white phosphorous with heteroleptic metallasilylenes. More information can be found in the Research Article by S. Schulz and co‐workers (DOI: 10.1002/chem.202201031).

article

Selective [2+1+1] Fragmentation of P₄ by heteroleptic Metallasilylenes

Juliane Schoening, Alexander Gehlhaar, Christoph Wölper, Stephan Schulz

Chemistry – A European Journal > 28 > 41 > n/a - n/a

Small‐molecule activation by low‐valent main‐group element compounds is of general interest. We here report the synthesis and characterization (¹H, ¹³C, ²⁹Si NMR, IR, sc‐XRD) of heteroleptic metallasilylenes L¹(Cl)MSiL² (M=Al 1, Ga 2, L¹=HC[C(Me)NDipp]₂, Dipp=2,6‐ⁱPr₂C₆H₃; L²=PhC(N^tBu)₂). Their electronic nature was analyzed by quantum chemical computations, while their promising potential in small‐molecule...

article

Bis‐Phosphaketenes LM(PCO)₂ (M=Ga, In): A New Class of Reactive Group 13 Metal‐Phosphorus Compounds

Mahendra K. Sharma, Pratima Dhawan, Christoph Helling, Christoph Wölper, more

Chemistry – A European Journal > 28 > 22 > n/a - n/a

Phosphaketenes are versatile reagents in organophosphorus chemistry. We herein report on the synthesis of novel bis‐phosphaketenes, LM(PCO)₂ (M=Ga 2 a, In 2 b; L=HC[C(Me)N(Ar)]₂; Ar=2,6‐i‐Pr₂C₆H₃) by salt metathesis reactions and their reactions with LGa to metallaphosphenes LGa(OCP)PML (M=Ga 3 a, In 3 b). 3 b represents the first compound with significant In−P π‐bonding contribution as was confirmed...

article

Tracer‐aided modelling reveals quick runoff generation and young streamflow ages in a tropical rainforest catchment

Leia Mayer‐Anhalt, Christian Birkel, Ricardo Sánchez‐Murillo, Stephan Schulz

Hydrological Processes > 36 > 2 > n/a - n/a

There is still limited understanding of where stream water originates, their flow paths, how water sources mix, and for how long water transits montane tropical catchments. Here, we used a simple gamma convolution integral model (GM), ensemble hydrograph separation (EHS) and a tracer‐aided model (TAM) to assess runoff generation, mixing processes and water ages in the pristine tropical rainforest...

article

Comparison of the Catalytic Activity of Mono‐ and Multinuclear Ga Complexes in the ROCOP of Epoxides and Cyclic Anhydrides

Swarup Ghosh, Eduard Glöckler, Christoph Wölper, Jürgen Linders, more

European Journal of Inorganic Chemistry > 2022 > 3 > n/a - n/a

Tetranuclear Schiff‐base complexes L^1–3₂Ga₄(t‐Bu)₈ 1–3 are highly active and selective (>99 %) catalyst in the alternating ring‐opening copolymerization (ROCOP) of epoxides and anhydrides, yielding polyesters with high molecular weights (M_n) and narrow dispersity (Đ). The thermal properties (T_g) of the resulting polyester range from 18 °C to 124 °C and increase with increasing steric bulk or rigidity...

article

Formation and Cleavage of a Sb−Sb Double Bond: From Carbene‐Coordinated Distibenes to Stibinidenes

Julia Krüger, Christoph Wölper, Alexander A. Auer, Stephan Schulz

European Journal of Inorganic Chemistry > 2022 > 3 > n/a - n/a

Reactions of L(Cl)Ga‐substituted stibine [L(Cl)Ga]₂SbCl (L=HC[C(Me)NAr]₂; Ar=2,6‐i‐Pr₂C₆H₃) with N‐heterocyclic carbenes ^RNHC^Me (^RNHC^Me=[C(R)NMe]₂C:; R=Me, Et, iPr) gave NHC‐coordinated stibinidenes L(Cl)GaSb‐^RNHC^Me (R=Me 1 a, Et 1 b, iPr 1 c) and distibenes L(Cl)GaSbSb(^RNHC^Me)Ga(Cl)L (R=Me 2 a, Et 2 b, iPr 2 c). Distibenes 2 a and 2 b react with a second equivalent of ^RNHC^Me with cleavage of the...

article

Noncovalent Intra‐ and Intermolecular Interactions in Peri‐Substituted Pnicta Naphthalene and Acenaphthalene Complexes

Alexander Gehlhaar, Christoph Wölper, Felix Vight, Georg Jansen, more

European Journal of Inorganic Chemistry > 2022 > 2 > n/a - n/a

Five peri‐substituted naphthalene and acenaphthalene complexes (Ph₂Pn)₂Naph (E=Sb 1, Bi 3), (Ph₂Sb)₂Acenaph (2), (Ph₂Bi)(Me₃Sn)Naph (4) and (PhBiNaph)₂ (5) were synthesized and characterized in solution (¹H, ¹³C NMR, IR) and in the solid‐state (sc‐XRD). 1–5 show different types of noncovalent intermolecular interactions in the solid‐state including Naph−H⋅⋅⋅π, π⋅⋅⋅π and Bi⋅⋅⋅π (5) contacts, which...

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INFONA - science communication portal

Search results for: Stephan Schulz

From Neutral Diarsenes to Diarsene Radical Ions and Diarsene Dications

Gallaphosphene L(Cl)GaPGaL: A novel phosphinidene transfer reagent

Cyclic Alkyl(amino) Carbene‐Induced Rearrangement of Ga‐Phosphaketene

Syntheses and Structures of 5‐Membered Heterocycles Featuring 1,2‐Diphospha‐1,3‐Butadiene and Its Radical Anion

Syntheses and Structures of 5‐Membered Heterocycles Featuring 1,2‐Diphospha‐1,3‐Butadiene and Its Radical Anion

Sjoerd Harder: a true ambassador of main group chemistry

Density‐Dependence of Surface Transport in Tellurium‐Enriched Nanograined Bulk Bi₂Te₃

Crystal Plane‐Related Oxygen‐Evolution Activity of Single Hexagonal Co₃O₄ Spinel Particles

C−Br Bond Activation of Bromoalkanes with Gallanediyl LGa

Einzelpartikel‐Elektrochemie belegt die dynamische Transformation von Cu₂O und Co₃O₄ während der Tandemkatalyse zur Umwandlung von NO₃⁻ in NH₃

Single‐entity Electrochemistry Unveils Dynamic Transformation during Tandem Catalysis of Cu₂O and Co₃O₄ for Converting NO₃⁻ to NH₃

Small‐Molecule Activation by Heteroleptic Metallasilylenes

Front Cover: Small‐Molecule Activation by Heteroleptic Metallasilylenes (Eur. J. Inorg. Chem. 2/2023)

Cover Feature: Selective [2+1+1] Fragmentation of P₄ by heteroleptic Metallasilylenes (Chem. Eur. J. 41/2022)

Selective [2+1+1] Fragmentation of P₄ by heteroleptic Metallasilylenes

Bis‐Phosphaketenes LM(PCO)₂ (M=Ga, In): A New Class of Reactive Group 13 Metal‐Phosphorus Compounds

Tracer‐aided modelling reveals quick runoff generation and young streamflow ages in a tropical rainforest catchment

Comparison of the Catalytic Activity of Mono‐ and Multinuclear Ga Complexes in the ROCOP of Epoxides and Cyclic Anhydrides

Formation and Cleavage of a Sb−Sb Double Bond: From Carbene‐Coordinated Distibenes to Stibinidenes

Noncovalent Intra‐ and Intermolecular Interactions in Peri‐Substituted Pnicta Naphthalene and Acenaphthalene Complexes

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