Die Elemente

Emsley, John; Riedel, Erwin

doi:10.1515/9783110857054

Cited by 133 publications

(132 citation statements)

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“…2. Значення міжатомних віддалей добре корелюють сумам атомних радіусів компонентів (r Nd = 1,821 Å, r Cu = 1,278 Å та r Al = 1,431 Å) [10]) (табл. 3).…”

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Сrystal structure of neodymium and copperternary monoaluminide

Fedyna¹,

Fedorchuk²,

Stelmakhovych³

et al. 2018

Visnyk Lviv Univ. Ser. Chem.

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Рентгенівським дифракційним методом порошку (Huber G670 Imaging Plate Guinier camera, CuK 1 -випромінювання) досліджено кристалічну структуру тернарної сполуки NdCuAl (структурний тип ZrNiAl, символ Пірсона hP9, просторова група P-62m, a = 7,16752(4), c = 4,12089(4) Å, V = 183,341(1) Å 3 , R І = 0,065, R Р = 0,088). Розглянуто особливості кристалічних структур сполук еквіатомного складу в системах R−Cu−X (X -елемент ІІІ А групи періодичної системи хімічних елементів) та інтерметалідів на розрізі 33,3 ат. % в системі Nd−Cu−Al при 770 K. Проаналізовано взаємозв'язок структур дослідженої та споріднених сполук згідно з координацією найменш електронегативного атома.Ключові слова: Неодим, Купрум, Алюміній, рентгенівський метод порошку, тернарна сполука, кристалічна структура.

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unclassified

Сrystal structure of neodymium and copperternary monoaluminide

Fedyna¹,

Fedorchuk²,

Stelmakhovych³

et al. 2018

Visnyk Lviv Univ. Ser. Chem.

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“…[17] This results in different coordination environments of the metal centre, that is, distorted dicapped tetrahedron (C,O) 2 SnC 2 core in 1a (hypervalent 12-Sn-6 species), [18] in which only two oxygen atoms form OǞSn intramolecular interactions, and distorted tetracapped tetrahedron (C,O) 4 Sn core in 2 (hypervalent 16-Sn-8 species), in which all four oxygen atoms coordinate the tin atom (see also the Supporting Information). The shorter OǞSn interaction distances for 1a compared to those of 2 (see Tables 1 and 2) reflect the slightly stronger Lewis acid character of the hexacoordinate tin in 1a compared to the octacoordinated tin present in 2.…”

Section: Solid-state Structuresmentioning

confidence: 99%

“…This behaviour is due to the rapid quadrupolar relaxation of the four 17 O nuclei in the vicinity of the tin atom, which results in an extremely broad 119 Sn resonance and prevents its observation in direct 119 Sn detection. [20] A slower relaxation of the 17 O nuclei occurs at low temperatures, and registration of the NMR spectrum of 2 at -30°C allows the observation of the 119 Sn resonance at δ = -130.3 ppm. Alternatively, a heteronuclear correlation technique can be applied to detect the 119 Sn resonance signal.…”

Section: Solution Behaviourmentioning

confidence: 99%

Structural Diversity of Coordination Cores in Homoleptic Tetraaryltin(IV) Dioxolane, Aldehyde and Imines: The First Octacoordinated Double Helicate Tetraorganotin(IV) Compound

2013

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Reaction of [2‐{(CH2O)2CH}C6H4]Li with SnCl4 in a 4:1 molar ratio afforded [2‐{(CH2O)2CH}C6H4]4Sn (1), which was deprotected to give [2‐(O=CH)C6H4]4Sn (2). Homoleptic [2‐(RN=CH)C6H4]4Sn [R = Me2NCH2CH2 (3), 2,4,6‐Me3C6H2 (4), PhCH2 (5)] were obtained by condensation of 2 with the corresponding amine either in solution or by using a green, solvent‐free procedure for (imino)arylmetal species. All compounds were characterised by multinuclear NMR spectroscopy and mass spectrometry, and their molecular structures were determined by single‐crystal X‐ray diffraction. In all cases, the C4Sn core is distorted tetrahedral as a result of the combined effects of the intramolecular coordination of the heteroatoms from the organic ligands and the steric impediments imposed by the ligands. The overall coordination around tin was found to be different, that is, coordination numbers from six for 1 and 4, to seven for 3 and 5 and eight for 2. Compound 2 is the first example of a mononuclear tetraorganotin(IV) compound that contains an octacoordinated metal centre with a double helicate topology in the solid state. Multinuclear NMR spectroscopy studies in solutions of CDCl3 are consistent with equivalent organic groups attached to a tetracoordinate tin atom.

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“…Σr cov (Sn,Cl) = 2.39 Å, Σr vdW (Sn,Cl) ≈ 4.01 Å], [43] which involve the chlorine atom at the axial position in the molecular unit (Figure 3a). The vector of the Sn···Cl interaction bisects the C(1)-Sn(1)-C(10) [143.0(2)°] equatorial angle of the parent trigonal bipyramidal core of the molecular unit, in a trans configuration with respect to the Cl(2) atom [Cl(2)-Sn(1)···Cl(1b) = 177.35(5)°], which is not involved in intermolecular interactions.…”

Section: Solid-state Structures Of the Diorganotin Dihalidesmentioning

confidence: 99%

“…Symmetry-equivalent atoms (1 -x, 1 -y, -z), (x, -1 + y, -1 + z), (1 -x, -y, -1 -z) and (1 -x, 2 -y, 1 -z) are given by a, Ј, aЈ and aЈЈ, respectively. the sum of the van der Waals radii of the corresponding atoms [Σr vdW (Sn,N) ≈ 3.74 Å [43] ]. Compound 4 was recrystallized from chloroform to give its solvate 4·2CHCl 3 .…”

Section: Solid-state Structures Of Compounds 3 Andmentioning

confidence: 99%

Solid‐State Structure and Behaviour in Solution of Hypervalent Organotin(IV) Derivatives Containing 2‐(Me₂NCH₂)C₆H₄ Moieties

2008

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Hypervalent diorganotin(IV) dihalides of the type RBuSnX2 [R = 2‐(Me2NCH2)C6H4; X = Cl (1), F (2)] and heterocyclic derivatives of the type (RR1SnS)2 [R1 = Bu (3) and 2‐(Me2NCH2)C6H4 (4 and 4·2CHCl3)] have been prepared. Their behaviour in solution was investigated by multinuclear NMR spectroscopy. The molecular structures of these compounds were established by single‐crystal X‐ray diffraction. The strength of the intramolecular Sn→N coordination as a function of the substituent pattern at the tin atom is discussed. Weak intermolecular Sn···Cl interactions result in a “zig‐zag” polymeric chain for dichloride 1, while difluoride 2 is a polymer with a linear –Sn–F–Sn– skeleton. In both compounds, a distorted octahedral (C,N)CSnX3 configuration is observed. The thio derivatives are monomeric and exhibit distorted trigonal bipyramidal (C,N)CSnS2 (3) or distorted octahedral (C,N)2SnS2 (4 and 4·2CHCl3) configurations. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)

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Die Elemente

Cited by 133 publications

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Сrystal structure of neodymium and copperternary monoaluminide

Сrystal structure of neodymium and copperternary monoaluminide

Structural Diversity of Coordination Cores in Homoleptic Tetraaryltin(IV) Dioxolane, Aldehyde and Imines: The First Octacoordinated Double Helicate Tetraorganotin(IV) Compound

Solid‐State Structure and Behaviour in Solution of Hypervalent Organotin(IV) Derivatives Containing 2‐(Me₂NCH₂)C₆H₄ Moieties

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Die Elemente

Cited by 133 publications

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Сrystal structure of neodymium and copperternary monoaluminide

Сrystal structure of neodymium and copperternary monoaluminide

Structural Diversity of Coordination Cores in Homoleptic Tetraaryltin(IV) Dioxolane, Aldehyde and Imines: The First Octacoordinated Double Helicate Tetraorganotin(IV) Compound

Solid‐State Structure and Behaviour in Solution of Hypervalent Organotin(IV) Derivatives Containing 2‐(Me2NCH2)C6H4 Moieties

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Solid‐State Structure and Behaviour in Solution of Hypervalent Organotin(IV) Derivatives Containing 2‐(Me₂NCH₂)C₆H₄ Moieties