Search results for: Larry R. Falvello

Items from 1 to 20 out of 82 results

article

Stability of Ag^III towards Halides in Organosilver(III) Complexes

Daniel Joven‐Sancho, Miguel Baya, Larry R. Falvello, Antonio Martín, more

Chemistry – A European Journal > 27 > 50 > 12796 - 12806

The involvement of silver in two‐electron Ag^I/Ag^III processes is currently emerging. However, the range of stability of the required and uncommon Ag^III species is virtually unknown. Here, the stability of Ag^III towards the whole set of halide ligands in the organosilver(III) complex frame [(CF₃)₃AgX]⁻ (X=F, Cl, Br, I, At) is theoretically analyzed. The results obtained depend on a single factor: the...

article

Cover Feature: Stability of Ag^III towards Halides in Organosilver(III) Complexes (Chem. Eur. J. 50/2021)

Daniel Joven‐Sancho, Miguel Baya, Larry R. Falvello, Antonio Martín, more

Chemistry – A European Journal > 27 > 50 > 12712 - 12712

Surprising silver: The binary silver(I) halides, AgX, are well‐known chemical species. In contrast, the only binary halide of silver(III) currently known is the fluoride AgF₃. The CF₃ group provides a suitable frame to stabilise silver(III) compounds with every halogen; these have been isolated and thoroughly characterised. Multistage unimolecular fragmentation experiments demonstrate that the Ag−X...

article

Building C(sp³) Molecular Complexity on 2,2′‐Bipyridine and 1,10‐Phenanthroline in Rhenium Tricarbonyl Complexes

Rebeca Arevalo, Ramón López, Larry R. Falvello, Lucía Riera, more

Chemistry – A European Journal > 27 > 1 > 379 - 389

The reactions of [Re(N‐N)(CO)₃(PMe₃)]OTf (N‐N=2,2′‐bipyridine, bipy; 1,10‐phenanthroline, phen) compounds with tBuLi and with LiHBEt₃ have been explored. Addition to the N‐N chelate took place with different site‐selectivity depending on both chelate and nucleophile. Thus, with tBuLi, an unprecedented addition to C5 of bipy, a regiochemistry not accessible for free bipy, was obtained, whereas coordinated...

article

Crystalline transformers: more within than meets the eye

Larry R. Falvello

Acta Crystallographica Section B > 74 > 5 > 403 - 404

Studies of phase transitions in molecular crystals are becoming more commonplace as improvements in instrumentation and technique enable more efficient exploration of the behavior of samples with varying external conditions, usually temperature. This scientific commentary provides contextual background on this type of study, with reference to an article on transformations in a ferrocenyl–acetylide–gold(I)...

article

(CF₃)₃Au as a Highly Acidic Organogold(III) Fragment

Alberto Pérez‐Bitrián, Miguel Baya, José M. Casas, Larry R. Falvello, more

Chemistry – A European Journal > 23 > 59 > 14918 - 14930

The Lewis acidity of perfluorinated trimethylgold (CF₃)₃Au was assessed by theoretical and experimental methods. It was found that the (CF₃)₃Au unit is much more acidic than its nonfluorinated analogue (CH₃)₃Au, and probably sets the upper limit of the acidity scale for neutral organogold(III) species R₃Au. The significant acidity increase on fluorination is in line with the CF₃ group being more electron‐withdrawing...

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Syntheses, crystal structure and magnetocaloric effect of [Gd(PDOA)(NO3)(H2O)2]n

Juraj Černák, Katarína Harčárová, Martin Uličný, Róbert Tarasenko, more

Journal of Molecular Structure > 2017 > 1137 > C > 179-185

The coordination polymer [Gd(PDOA)(NO₃)(H₂O)₂]_n (1) (PDOA = o-phenylenedioxydiacetato) has been prepared and spectroscopically and structurally characterized. Its crystal structure is formed of a ribbon-like arrangement of Gd(III) atoms linked by bridging carboxylate groups and placed at the cusps of fused triangles with Gd⋯Gd distances of about 6.1 Å. The Gd(III) central atoms exhibit decacoordination...

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Preparation, First Structure Analysis, and Magnetism of the Long‐Known Nickel Benzoate Trihydrate – A Linear Ni···Ni···Ni Polymer and Its Parallels with the Active Site of Urease

Anna Vráblová, Larry R. Falvello, Javier Campo, Jozef Miklovič, more

European Journal of Inorganic Chemistry > 2016 > 6 > 928 - 934

Nickel benzoate trihydrate (1) has been prepared in single‐crystalline form by the reaction of nickel carbonate with benzoic acid in boiling aqueous solution. Its crystal structure comprises positively charged [Ni(Bz)(H₂O)₂]_nⁿ⁺ chains, benzoate anions, and one independent water molecule of solvation. The hexacoordinate Ni^II centers in the chains are triply bridged by one syn‐syn carboxylato and two...

article

Synthesis, crystal structure and magnetic properties of (acetato‐κ²O,O′)bis(5,5′‐dimethyl‐2,2′‐bipyridine‐κ²N,N′)nickel(II) perchlorate monohydrate

Nela Farkašová, Juraj Černák, Larry R. Falvello, Martin Orendáč, more

Acta Crystallographica Section C > 71 > 4 > 252 - 257

The title hydrated ionic complex, [Ni(CH₃COO)(C₁₂H₁₂N₂)₂]ClO₄·H₂O or [Ni(ac)(5,5′‐dmbpy)₂]ClO₄·H₂O (where 5,5′‐dmbpy is 5,5′‐dimethyl‐2,2′‐bipyridine and ac is acetate), (1), was isolated as violet crystals from the aqueous ethanolic nickel acetate–5,5′‐dmbpy–KClO₄ system. Within the complex cation, the Ni^II atom is hexacoordinated by two chelating 5,5′‐dmbpy ligands and one chelating ac ligand. The...

article

Two novel coordination polymers in the family of lanthanide complexes with o-phenylenedioxydiacetato as ligand

Monika Stolárová, Juraj Černák, Milagros Tomás, Irene Ara, more

Polyhedron > 2015 > 88 > Complete > 149-155

Two novel coordination polymers [Ce(PDOA)(NO ₃ )(H ₂ O) ₂ ] _n (1) and {[Ce(PDOA)(NO ₃ )(H ₂ O) ₃ ]·H ₂ O} _n (2) (PDOA=o-phenylenedioxydiacetato) have been prepared using hydrothermal conditions and have been structurally characterized. In both crystal structures 1 and 2 the Ce(III) atoms are decacoordinated by oxygen atoms from...

article

Metal–metal bonded compounds and metal clusters

Larry R. Falvello, Carlos A. Murillo

Inorganica Chimica Acta > 2015 > 424 > C > 1-2

article

An introduction to the special issue on interplay of crystallography, spectroscopy and theoretical methods for solving chemical problems

Larry R. Falvello, Alberto Albinati

Acta Crystallographica Section C > 69 > 12 > 1415 - 1415

article

Proton Cascade in a Molecular Solid: H/D Exchange on Mobile and Immobile Water

Silvia C. Capelli, Larry R. Falvello, Elena Forcén‐Vázquez, Garry J. McIntyre, more

Angewandte Chemie > 125 > 50 > 13705 - 13709

Porenfreies Arbeiten: Durch Neutronenbeugung wurde gezeigt, dass in nichtporösen, kanalfreien Kristallen eines Mangancitrat‐Koordinationspolymers sowohl die metallgebundenen als auch die cokristallisierten Wassermoleküle einen vollständigen Wasserstoff‐Deuterium‐Austausch eingehen. Neutronenbeugungsanalysen lieferten ein Muster der Wasserstofffehlordnung, das mithilfe des Protonenkaskaden‐Mechanismus...

article

Titelbild: Proton Cascade in a Molecular Solid: H/D Exchange on Mobile and Immobile Water (Angew. Chem. 50/2013)

Silvia C. Capelli, Larry R. Falvello, Elena Forcén‐Vázquez, Garry J. McIntyre, more

Angewandte Chemie > 125 > 50 > 13345 - 13345

Ein Gegenstück zum Grotthuß‐Mechanismus des Protonentransports beobachten L. R. Falvello, G. J. McIntyre, M. Tomás et al. in ihrer Zuschrift auf S. 13705 ff. in nichtporösen Einkristallen. Die Pirouette steht für die Drehung von Wassermolekülen, die einen Schritt im Mechanismus darstellt, die Grand jeté verbildlicht das Hüpfen von Protonen entlang einer Wasserkette, ein weiterer Schritt im Mechanismus...

article

Cover Picture: Proton Cascade in a Molecular Solid: H/D Exchange on Mobile and Immobile Water (Angew. Chem. Int. Ed. 50/2013)

Silvia C. Capelli, Larry R. Falvello, Elena Forcén‐Vázquez, Garry J. McIntyre, more

Angewandte Chemie International Edition > 52 > 50 > 13107 - 13107

A reflection on the “Grotthuss mechanism” of proton transport observed in nonporous single crystals by L. R. Falvello, G. J. McIntyre, M. Tomás et al. in their Communication on page 13463 ff. The pirouette shows the rotation of water molecules, one step in the mechanism, and the grand jeté leap is a metaphor for proton hopping along the water wire, the other step. The backdrop shows two strands of...

article

Proton Cascade in a Molecular Solid: H/D Exchange on Mobile and Immobile Water

Silvia C. Capelli, Larry R. Falvello, Elena Forcén‐Vázquez, Garry J. McIntyre, more

Angewandte Chemie International Edition > 52 > 50 > 13463 - 13467

Working without pores: In non‐porous, channel‐free crystals of a manganese citrate coordination polymer, neutron diffraction reveals that the water molecules, both metal‐bound and co‐crystallized, undergo full hydrogen/deuterium exchange. Neutron diffraction analyses show a pattern of hydrogen disorder that can be interpreted in terms of the Grotthuss proton‐cascade mechanism (see scheme).

article

Gold(I) and Gold(III) Trifluoromethyl Derivatives

Sonia Martínez‐Salvador, Larry R. Falvello, Antonio Martín, Babil Menjón

Chemistry – A European Journal > 19 > 43 > 14540 - 14552

Trifluoromethylation of AuCl₃ by using the Me₃SiCF₃/CsF system in THF and in the presence of [PPh₄]Br proceeds with partial reduction, yielding a mixture of [PPh₄][Au^I(CF₃)₂] (1′) and [PPh₄][Au^III(CF₃)₄] (2′) that can be adequately separated. An efficient method for the high‐yield synthesis of 1′ is also described. The molecular geometries of the homoleptic anions [Au^I(CF₃)₂]⁻ and [Au^III(CF₃)₄]⁻ in...

article

Crystal structure and thermal properties of a square‐planar Ni^II complex of cyanide and a tricyclic bis‐amidine ligand formed in situ under solvothermal conditions

Monika Stolárová, Juraj Černák, Milagros Tomás, Larry R. Falvello

Acta Crystallographica Section C > 69 > 6 > 565 - 568

The reaction of N¹,N^1′‐(ethane‐1,2‐diyl)bis(propane‐1,3‐diamine) (bapen), K₂[Ni(CN)₄]·H₂O and dimethylformamide in the presence of Gd(NO₃)₃·6H₂O under solvothermal conditions yielded yellow crystals of dicyanido(2,3,4,6,7,9,10,11‐octahydropyrimido[2′,1′:3,4]pyrazino[1,2‐a]pyrimidine)nickel(II) hemihydrate, [Ni(CN)₂(C₁₀H₁₆N₄)]·0.5H₂O, (I), the crystal structure of which is composed of [Ni(CN)₂(pdpm)]...

article

An Organotransition‐Metal Complex with Pentagonal‐Pyramidal Structure

M. Angeles García‐Monforte, Miguel Baya, Larry R. Falvello, Antonio Martín, more

Angewandte Chemie International Edition > 51 > 32 > 8046 - 8049

Star gazing: The six‐coordinate organoniobium(V) compound [NBu₄]₂[NbO(C₆F₅)₅] has been found to exhibit a pentagonal‐pyramidal (PPY‐6) structure, which is unprecedented in organotransition‐metal chemistry (see picture: complex as viewed down the O–Nb axis; C in gray, O in red, F in yellow, and Nb in blue).

article

An Organotransition‐Metal Complex with Pentagonal‐Pyramidal Structure

M. Angeles García‐Monforte, Miguel Baya, Larry R. Falvello, Antonio Martín, more

Angewandte Chemie > 124 > 32 > 8170 - 8173

Sternchen: Die sechsfach koordinierte Organoniob(V)‐Verbindung [NBu₄]₂[NbO(C₆F₅)₅] liegt in einer pentagonal‐pyramidalen (PPY‐6) Struktur vor, die für Organoübergangsmetallkomplexe beispiellos ist (siehe Ansicht des Komplexes entlang der O‐Nb‐Achse; C grau, O rot, F gelb, Nb blau).

article

Luminescent Di‐ and Polynuclear Organometallic Gold(I)–Metal (Au₂, {Au₂Ag}_n and {Au₂Cu}_n) Compounds Containing Bidentate Phosphanes as Active Antimicrobial Agents

Malgorzata Frik, Josefina Jiménez, Ismael Gracia, Larry R. Falvello, more

Chemistry – A European Journal > 18 > 12 > 3659 - 3674

The reaction of new dinuclear gold(I) organometallic complexes containing mesityl ligands and bridging bidentate phosphanes [Au₂(mes)₂(μ‐LL)] (LL=dppe: 1,2‐bis(diphenylphosphano)ethane 1 a, and water‐soluble dppy: 1,2‐bis(di‐3‐pyridylphosphano)ethane 1 b) with Ag⁺ and Cu⁺ lead to the formation of a family of heterometallic clusters with mesityl bridging ligands of the general formula [Au₂M(μ‐mes)₂...

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INFONA - science communication portal

Search results for: Larry R. Falvello

Stability of Ag^III towards Halides in Organosilver(III) Complexes

Cover Feature: Stability of Ag^III towards Halides in Organosilver(III) Complexes (Chem. Eur. J. 50/2021)

Building C(sp³) Molecular Complexity on 2,2′‐Bipyridine and 1,10‐Phenanthroline in Rhenium Tricarbonyl Complexes

Crystalline transformers: more within than meets the eye

(CF₃)₃Au as a Highly Acidic Organogold(III) Fragment

Syntheses, crystal structure and magnetocaloric effect of [Gd(PDOA)(NO3)(H2O)2]n

Preparation, First Structure Analysis, and Magnetism of the Long‐Known Nickel Benzoate Trihydrate – A Linear Ni···Ni···Ni Polymer and Its Parallels with the Active Site of Urease

Synthesis, crystal structure and magnetic properties of (acetato‐κ²O,O′)bis(5,5′‐dimethyl‐2,2′‐bipyridine‐κ²N,N′)nickel(II) perchlorate monohydrate

Two novel coordination polymers in the family of lanthanide complexes with o-phenylenedioxydiacetato as ligand

Metal–metal bonded compounds and metal clusters

An introduction to the special issue on interplay of crystallography, spectroscopy and theoretical methods for solving chemical problems

Proton Cascade in a Molecular Solid: H/D Exchange on Mobile and Immobile Water

Titelbild: Proton Cascade in a Molecular Solid: H/D Exchange on Mobile and Immobile Water (Angew. Chem. 50/2013)

Cover Picture: Proton Cascade in a Molecular Solid: H/D Exchange on Mobile and Immobile Water (Angew. Chem. Int. Ed. 50/2013)

Proton Cascade in a Molecular Solid: H/D Exchange on Mobile and Immobile Water

Gold(I) and Gold(III) Trifluoromethyl Derivatives

Crystal structure and thermal properties of a square‐planar Ni^II complex of cyanide and a tricyclic bis‐amidine ligand formed in situ under solvothermal conditions

An Organotransition‐Metal Complex with Pentagonal‐Pyramidal Structure

An Organotransition‐Metal Complex with Pentagonal‐Pyramidal Structure

Luminescent Di‐ and Polynuclear Organometallic Gold(I)–Metal (Au₂, {Au₂Ag}_n and {Au₂Cu}_n) Compounds Containing Bidentate Phosphanes as Active Antimicrobial Agents

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