Search results for: Ulli Englert

Items from 1 to 20 out of 123 results

article

A Cationic Barium Hydride Complex Supported by an NNNN‐Type Macrocycle

Thomas Höllerhage, Thomas P. Spaniol, Ulli Englert, Jun Okuda

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

The dibenzyl complex of barium [(Me₄TACD)Ba(CH₂Ph)₂] was prepared by reacting [Ba(CH₂Ph)₂] with NNNN‐type macrocycle Me₄TACD (Me₄TACD=1,4,7,10‐tetramethyltetraazacyclododecane) and isolated as yellow crystals. Single crystal X‐ray diffraction revealed η²‐ and η³‐coordination of the benzyl groups. The benzylbarium cation in [(Me₄TACD)Ba(CH₂Ph)(thf)][B(C₆H₃‐3,5‐Me₂)₄] was obtained upon protonolysis...

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Bimetallic Organoplatinum(II)‐Ag(I) Cluster Cations with Ag−Pt Interactions Unsupported by Conventional Bridging Ligands

William Raven, Irmgard Kalf, Carsten Paulmann, Ulli Englert

Zeitschrift für anorganische und allgemeine Chemie > 648 > 12 > n/a - n/a

The organoplatinum complex of a primary amine and AgClO₄ aggregate in methanol to oligonuclear mixed‐metal species. A perchlorate salt 3 with the empirical formula C₉₆H₁₄₆Ag₇Cl₁₃N₁₂O₆₂Pt₆ could be isolated and structurally characterized with the help of X‐ray diffraction at the DESY synchrotron. The product contains both a penta‐ and a tetra‐nuclear complex cation in which Ag(I) and Pt(II) alternate,...

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Bildung und Reaktivität eines Hydridosilikats [SiH₆]²⁻, koordiniert an einem durch einen Makrozyklus stabilisierten Strontiumkation

Thomas Höllerhage, Priyabrata Ghana, Thomas P. Spaniol, Ambre Carpentier, more

Angewandte Chemie > 134 > 10 > n/a - n/a

Der kationische Benzylkomplex [(Me₄TACD)Sr(CH₂Ph)][A] (Me₄TACD (Me₄TACD=1,4,7,10‐Tetramethyltetraazacyclododecan); A=B(C₆H₃‐3,5‐Me₂)₄) reagierte mit zwei Äquivalenten Phenylsilan zum verbrückenden Hexahydridosilikat‐Komplex [(Me₄TACD)₂Sr₂(thf)₄(μ‐κ³ : κ³‐SiH₆)][B(C₆H₃‐3,5‐Me₂)₄]₂ (3 a). Angenommen wird, dass ein schneller Phenyl‐Austausch zwischen Phenylsilanen das Monosilan SiH₄ bildet, das von zwei...

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Formation and Reactivity of a Hexahydridosilicate [SiH₆]²⁻ Coordinated by a Macrocycle‐Supported Strontium Cation

Thomas Höllerhage, Priyabrata Ghana, Thomas P. Spaniol, Ambre Carpentier, more

Angewandte Chemie International Edition > 61 > 10 > n/a - n/a

The cationic benzyl complex [(Me₄TACD)Sr(CH₂Ph)][A] (Me₄TACD=1,4,7,10‐tetramethyltetraazacyclododecane; A=B(C₆H₃‐3,5‐Me₂)₄) reacted with two equivalents of phenylsilane to give the bridging hexahydridosilicate complex [(Me₄TACD)₂Sr₂(thf)₄(μ‐κ³ : κ³‐SiH₆)][A]₂ (3 a). Rapid phenyl exchange between phenylsilane molecules is assumed to generate monosilane SiH₄ that is trapped by two strontium hydride...

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Sterically Crowded Tris(2‐(trimethylsilyl)phenyl)phosphine – Is it Still a Ligand?

Hans Gildenast, Felix Garg, Ulli Englert

Chemistry – A European Journal > 28 > 7 > n/a - n/a

Tris(2‐(trimethylsilyl)phenyl)phosphine, P(o‐TMSC₆H₄)₃, was synthesised and characterised in solution and in the solid state. The large steric bulk prevents most reactions of the phosphorus donor and makes the compound air stable both in the solid state as well as in solution. This shielded phosphine can still undergo three reactions, namely protonation, oxidation to the phosphine oxide under harsh...

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Reduced Arene Complexes of Hafnium Supported by a Triamidoamine Ligand

Priyabrata Ghana, Sebastian Schrader, Thayalan Rajeshkumar, Thomas P. Spaniol, more

Angewandte Chemie International Edition > 60 > 25 > 14179 - 14187

A series of hafnium complexes with a reduced arene of the general formula [K(L)][Hf(Xy‐N₃N)(arene)] (Xy‐N₃N={(3,5‐Me₂C₆H₃)NCH₂CH₂}₃N³⁻, L=THF, 18‐crown‐6; arene=C₁₀H₈²⁻, C₁₄H₁₀²⁻) mimic the chemistry of hafnium in its formal oxidation state +II. All compounds were obtained upon reduction of the chlorido complex [HfCl(Xy‐N₃N)(thf)] with two equivalents of potassium naphthalenide or anthracenide. The...

article

Reduzierte Arenkomplexe von Hafnium mit einem Triamidoaminliganden

Priyabrata Ghana, Sebastian Schrader, Thayalan Rajeshkumar, Thomas P. Spaniol, more

Angewandte Chemie > 133 > 25 > 14298 - 14306

Hafniumkomplexe mit reduzierten Arenen der Formel [K(L)][Hf(Xy‐N₃N)(Aren)] (Xy‐N₃N={(3,5‐Me₂C₆H₃)NCH₂CH₂}₃N³⁻, L=THF, 18‐Krone‐6; Ar=C₁₀H₈²⁻, C₁₄H₁₀²⁻) ahmen die Chemie von Hafnium in seiner formalen Oxidationsstufe +II nach. Alle Verbindungen wurden nach Reduktion des Chloridokomplexes [HfCl(Xy‐N₃N)(THF)] mit zwei Äquivalenten Kaliumnaphthalinid oder ‐anthracenid erhalten. Die reduzierende Natur...

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Triorganotin(IV) derivatives with semirigid heteroditopic hydroxo‐carboxylato ligands: Synthesis, characterization, and cytotoxic properties

Tushar S. Basu Baul, Maheswara Rao Addepalli, Andrew Duthie, Priya Singh, more

Applied Organometallic Chemistry > 35 > 2 > n/a - n/a

Three organic hydroxy‐carboxylic acids separated by a semirigid aromatic diaza scaffold and carrying alkyl groups of different steric hindrance (H′HL¹, cyclopropyl; H′HL², cyclohexyl; H′HL³, adamantyl) were employed as pro‐ligands. Their reaction with suitable triorganotin precursors leads to 10 complexes of compositions: [Me₃Sn(HL¹)]_n·0.5nC₆H₅CH₃ 1, [Et₃Sn(HL¹)]_n 2, [nBu₃Sn(HL¹)]_n 3, [Ph₃Sn(HL¹)]...

article

Titanium Carbene Complexes Stabilized by Alkali Metal Amides

Hassan Osseili, Khai‐Nghi Truong, Thomas P. Spaniol, Laurent Maron, more

Angewandte Chemie International Edition > 58 > 6 > 1833 - 1837

Facile α‐H elimination from tetrakis(trimethylsilylmethyl)titanium precursors to give adducts of (alkylidene)bis(alkyl)titanium complexes is induced by light alkali metal amides of the NNNN‐type macrocyclic anionic ligand Me₃TACD [(Me₃TACD)H=1,4,7‐trimethyl‐1,4,7,10‐tetraazacyclododecane]. In the crystal, the alkali metal interacts with the carbene carbon atom or with the CH₂ group of the trimethylsilymethyl...

article

Alkalimetallamid‐stabilisierte Titancarben‐Komplexe

Hassan Osseili, Khai‐Nghi Truong, Thomas P. Spaniol, Laurent Maron, more

Angewandte Chemie > 131 > 6 > 1847 - 1851

Die α‐H‐Eliminierung in Tetrakis(trimethylsilylmethyl)titan‐Vorstufen unter Bildung von (Alkyliden)bis(alkyl)titan‐Komplexen wird durch Metallamide leichter Alkalimetalle mit makrozyklischen Liganden Me₃TACD [(Me₃TACD)H=1,4,7‐Trimethyl‐1,4,7,10‐tetraazacyclododecan] vom NNNN‐Typ hervorgerufen. Im Kristall wechselwirkt das Alkalimetall mit dem Carben‐Kohlenstoffatom oder der CH₂‐Gruppe des Trimethylsilymethylliganden...

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C−I‐Selective Cross‐Coupling Enabled by a Cationic Palladium Trimer

Claudia J. Diehl, Thomas Scattolin, Ulli Englert, Franziska Schoenebeck

Angewandte Chemie International Edition > 58 > 1 > 211 - 215

While there is a growing interest in harnessing synergistic effects of more than one metal in catalysis, relatively little is known beyond bimetallic systems. This report describes the straightforward access to an air‐stable Pd trimer and presents unambiguous reactivity data of its privileged capability to differentiate C−I over C−Br bonds in C−C bond formations (arylation and alkylation) of polyhalogenated...

article

C−I‐Selective Cross‐Coupling Enabled by a Cationic Palladium Trimer

Claudia J. Diehl, Thomas Scattolin, Ulli Englert, Franziska Schoenebeck

Angewandte Chemie > 131 > 1 > 217 - 221

article

Crystal-to-crystal transformation from the triclinic to the cubic crystal system by partial desolvation

Qianqian Guo, Irmgard Kalf, Ulli Englert

Frontiers of Chemical Science and Engineering > 2018 > 12 > 3 > 433-439

Diffusion reaction of the labile building block Mg(acacCN)₂ (acacCN = 3-cyanoacetylacetonate) with silver salts leads to a series of solvated Mg/Ag bimetallic coordination polymers with composition [Mg(acacCN)₃Ag]·solvent. Despite their common stoichiometry, the topology of these polymers depends on the solvent of crystallization. The two-dimensional coordination compound [Mg(acacCN)₃Ag]·4CHCl₃ in...

article

Phase transition and proton ordering at 50 K in 3‐(pyridin‐4‐yl)pentane‐2,4‐dione

Khai-Nghi Truong, Carina Merkens, Martin Meven, Björn Faßbänder, more

Acta Crystallographica Section B > 73 > 6 > 1172 - 1178

Single‐crystal neutron diffraction experiments at 100 and 2.5 K have been performed to determine the structure of 3‐(pyridin‐4‐yl)pentane‐2,4‐dione (HacacPy) with respect to its protonation pattern and to monitor a low‐temperature phase transition. Solid HacacPy exists as the enol tautomer with a short intramolecular hydrogen bond. At 100 K, its donor···acceptor distance is 2.450 (8) Å and the compound...

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Mononuclear Alkali Metal Organoperoxides Stabilized by an NNNN‐Macrocycle and Short Hydrogen Bonds from ROOH Molecules

Hassan Osseili, Khai‐Nghi Truong, Thomas P. Spaniol, Debabrata Mukherjee, more

Chemistry – A European Journal > 23 > 68 > 17213 - 17216

A series of light alkali metal organoperoxides [MOOR] (M=Li, Na, K; R=tBu, CMe₂Ph) were isolated in mononuclear form, aided by the tetradentate and neutral NNNN‐type macrocycle Me₄TACD (L; Me₄[12]aneN₄=1,4,7,10‐tetramethyl‐1,4,7,10‐tetraazacyclododecane) and strong hydrogen bonds from additional ROOH molecules. The Na and K compounds are characterized by short O−H⋅⋅⋅O contacts, in the case of the...

article

3‐(Pyridin‐4‐yl)acetylacetone: a donor ligand towards mercury(II) halides and a versatile linker for complex materials

Khai-Nghi Truong, Carina Merkens, Ulli Englert

Acta Crystallographica Section B > 73 > 5 > 981 - 991

The ditopic organic molecule 3‐(pyridin‐4‐yl)acetylacetone (HacacPy) acts as a pyridine‐type ligand towards HgX₂ (X = Cl, Br, I). The nature of the anion and the ligand‐to‐cation ratio dominate the outcome of the reaction. Two different coordination compounds form with HgCl₂, namely a ligand‐rich mononuclear complex, HgCl₂(HacacPy)₂, and a ligand‐deficient one‐dimensional chain polymer, [Hg(μ‐Cl)₂...

article

Cd(II) coordination polymers based on expanded N,N′-heteroaromatic donor ligands

Mansoureh Zahedi, Behrouz Shaabani, Ulli Englert, Negar Rad-yousefnia, more

Polyhedron > 2017 > 133 > C > 110-118

The isomeric N donor linkers bis(pyridin-4-ylmethylene)naphthalene-1,5-diamine (L1) and bis(pyridin-3-ylmethylene)naphthalene-1,5-diamine (L2) have been used with acetate and iodide as co-ligands to generate four new cadmium(II) coordination polymers. [CdL1(OAc)₂]_n (1), [CdL1(I)₂]_n (2), [CdL2(OAc)₂]_n (3) and [CdL2(I)₂]_n (4) were characterized by elemental analysis, X-ray powder diffraction, IR spectroscopy,...

article

Synthesis, photophysical properties and structures of organotin-Schiff bases utilizing aromatic amino acid from the chiral pool and evaluation of the biological perspective of a triphenyltin compound

Tushar S. Basu Baul, Pelesakuo Kehie, Andrew Duthie, Nikhil Guchhait, more

Journal of Inorganic Biochemistry > 2017 > 168 > C > 76-89

Five new organotin(IV) complexes of compositions [Me₂SnL¹] (1), [Me₂SnL²]_n (2), [Me₂SnL³] (3), [Ph₃SnL¹H]_n (4) and [Ph₃SnL³H] (5) (where L¹=(2S)-2-((E)-((Z)-4-hydroxypent-3-en-2-ylidene)amino)-3-(1H-indol-3-yl)propanoate, L²=(2S)-(E)-2-((2-hydroxybenzylidene)amino)-3-(1H-indol-3-yl)propanoate and L³=(2S)-(E)-2-((1-(2-hydroxyphenyl)ethylidene)amino)-3-(1H-indol-3-yl)propanoate were synthesized and...

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Synthesis, characterization, crystal structures and supramolecular features of bicycloazastannoxides derived from Schiff bases with L-tyrosine

Tushar S. Basu Baul, Pelesakuo Kehie, Andrew Duthie, Ruimin Wang, more

Journal of Organometallic Chemistry > 2017 > 828 > C > 96-105

Six new bicycloazastannoxides of compositions [Me₂Sn(L¹H)] (1), [nBu₂Sn(L¹H)] (2), [Ph₂Sn(L¹H)] (3), [Bz₂Sn(L¹H)] (4), [Me₂Sn(L²H)(MeOH)]·MeOH (5) and [Ph₂Sn(L³H)] (6), where L¹H = 2-((E)-((Z)-4-hydroxypent-3-en-2-ylidene)amino)-3-(4-hydroxyphenyl)propanoate, L²H = (E)-2-((2-hydroxybenzylidene)amino)-3-(4-hydroxyphenyl)propanoate and L³H = (E)-3-(4-hydroxyphenyl)-2-((1-(2-hydroxyphenyl)ethylidene)amino)propanoate,...

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Decomposition of the mixed-metal coordination polymer—A preparation route of the active Ag/Yb2O3 catalyst for the deN2O process

Marcin Konkol, Małgorzata Kondracka, Paweł Kowalik, Wiesław Próchniak, more

Applied Catalysis B: Environmental > 2016 > 190 > C > 85-92

Ag nanoparticles in a Yb₂O₃ matrix catalyzed the direct decomposition of N₂O to the elements. Our investigations included X-ray powder diffraction and electron microscopy; they revealed a remarkable dependence of the catalytic activity on the catalyst preparation method that influenced the size of Ag crystallites. Simple precipitation followed by calcination resulted in the formation of a catalyst...

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Search results for: Ulli Englert

A Cationic Barium Hydride Complex Supported by an NNNN‐Type Macrocycle

Bimetallic Organoplatinum(II)‐Ag(I) Cluster Cations with Ag−Pt Interactions Unsupported by Conventional Bridging Ligands

Bildung und Reaktivität eines Hydridosilikats [SiH₆]²⁻, koordiniert an einem durch einen Makrozyklus stabilisierten Strontiumkation

Formation and Reactivity of a Hexahydridosilicate [SiH₆]²⁻ Coordinated by a Macrocycle‐Supported Strontium Cation

Sterically Crowded Tris(2‐(trimethylsilyl)phenyl)phosphine – Is it Still a Ligand?

Reduced Arene Complexes of Hafnium Supported by a Triamidoamine Ligand

Reduzierte Arenkomplexe von Hafnium mit einem Triamidoaminliganden

Triorganotin(IV) derivatives with semirigid heteroditopic hydroxo‐carboxylato ligands: Synthesis, characterization, and cytotoxic properties

Titanium Carbene Complexes Stabilized by Alkali Metal Amides

Alkalimetallamid‐stabilisierte Titancarben‐Komplexe

C−I‐Selective Cross‐Coupling Enabled by a Cationic Palladium Trimer

C−I‐Selective Cross‐Coupling Enabled by a Cationic Palladium Trimer

Crystal-to-crystal transformation from the triclinic to the cubic crystal system by partial desolvation

Phase transition and proton ordering at 50 K in 3‐(pyridin‐4‐yl)pentane‐2,4‐dione

Mononuclear Alkali Metal Organoperoxides Stabilized by an NNNN‐Macrocycle and Short Hydrogen Bonds from ROOH Molecules

3‐(Pyridin‐4‐yl)acetylacetone: a donor ligand towards mercury(II) halides and a versatile linker for complex materials

Cd(II) coordination polymers based on expanded N,N′-heteroaromatic donor ligands

Synthesis, photophysical properties and structures of organotin-Schiff bases utilizing aromatic amino acid from the chiral pool and evaluation of the biological perspective of a triphenyltin compound

Synthesis, characterization, crystal structures and supramolecular features of bicycloazastannoxides derived from Schiff bases with L-tyrosine

Decomposition of the mixed-metal coordination polymer—A preparation route of the active Ag/Yb2O3 catalyst for the deN2O process

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