H2N2V1, Main, Exploration, bibRecord, 001D35

Structural Chemistry of Lithium Hydrazides

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Structural Chemistry of Lithium Hydrazides

Auteurs : Heinrich Nöth [Allemagne] ; Hermann Sachdev [Allemagne] ; Martin Schmidt [Allemagne] ; Holger Schwenk [Allemagne]

Source :

Chemische Berichte [ 0009-2940 ] ; 1995-02.

RBID : ISTEX:03F02FF87A40A206E9A595F94CA3804DAE491B37

English descriptors

Teeft :
- Ambient temperature, Angew, Angew chem, Atom distances, Bond angles, Bond length, Bond lengths, Buli, Butterfly units, Chem, Coordination number, Data collection, Different ethyl groups, Dilithium, Direct methods, Hexagonal prism, Hexane, Hexane solution, Hydrazide, Hydrazides, Hydrogen atoms, Intensity ratio, Isomer, Klingebiel, Laddering, Li6ns core, Lithium, Lithium atoms, Lithium centers, Lithium hydrazides, Lithium lithiate, Me3si groups, Mmol, Molar ratio, Molecular structure, Molecular unit, Negative charge, Nitrogen atom, Nitrogen atoms, Nonhydrogen atoms, Noth, Organic synthesis, Other hand, Pentacoordinated, Phenyl, Phenyl groups, Phenyl rings, Point group, Probability level, Sachdev, Scan range scan speed, Single crystals, Single signal, Solid state, Space group, Standard deviations, Structural chemistry, Structure analysis, Structure determination, Structure solution, Tetracoordinated, Tetracoordinated atom, Tetrameric, Thermal ellipsoides, Unique reflections.

Abstract

Deprotonation of NH protons, of four diorgano‐, organo(trimethylsilyl)‐ and bis(trimethylsilyl)hydrazines by n‐butyllithium in hexane led to the following lithium hydrazides: [Et‐(Li)N‐N(H)Et]6, (1)6, [Me3Si(Li)N‐N(Li)SiMe3]4, (2)4, [Me3Si‐(Li)N‐N(Li)SiMe3 · (Me3Si)2N‐N(Li)SiMe3]2 (3)2, and [Ph‐(Li)N‐N(Li)SiMe3]4, (4)4, respectively. The structure determination by X‐ray methods at low temperature reveals butterfly‐shaped Li2N2 structural monomeric units which associate through “laddering” to the observed oligomers thereby generating penta‐ and hexacoordinated Li centers. N‐N bonds lengths of up to 1.556 Å suggest that negative charge accumulates at the nitrogen atoms of (1)6, (2)4, and (3)2. An amazing structure shows the red compound 4 where two Li ions are π‐sandwiched between two phenyl groups each. The compound can be looked at as a new type of a lithium lithiate complex, Li2[Li6N8Ph4(SiMe3)4], but short N‐C and N‐N bonds in the Li6N8 core indicate that its negative charge is transferred to the phenyl groups.

Url:

https://api.istex.fr/ark:/67375/WNG-2WVLM16D-Z/fulltext.pdf

DOI: 10.1002/cber.19951280204

Affiliations:

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<term>Bond angles</term>
<term>Bond length</term>
<term>Bond lengths</term>
<term>Buli</term>
<term>Butterfly units</term>
<term>Chem</term>
<term>Coordination number</term>
<term>Data collection</term>
<term>Different ethyl groups</term>
<term>Dilithium</term>
<term>Direct methods</term>
<term>Hexagonal prism</term>
<term>Hexane</term>
<term>Hexane solution</term>
<term>Hydrazide</term>
<term>Hydrazides</term>
<term>Hydrogen atoms</term>
<term>Intensity ratio</term>
<term>Isomer</term>
<term>Klingebiel</term>
<term>Laddering</term>
<term>Li6ns core</term>
<term>Lithium</term>
<term>Lithium atoms</term>
<term>Lithium centers</term>
<term>Lithium hydrazides</term>
<term>Lithium lithiate</term>
<term>Me3si groups</term>
<term>Mmol</term>
<term>Molar ratio</term>
<term>Molecular structure</term>
<term>Molecular unit</term>
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<term>Sachdev</term>
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<term>Single signal</term>
<term>Solid state</term>
<term>Space group</term>
<term>Standard deviations</term>
<term>Structural chemistry</term>
<term>Structure analysis</term>
<term>Structure determination</term>
<term>Structure solution</term>
<term>Tetracoordinated</term>
<term>Tetracoordinated atom</term>
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<front><div type="abstract" xml:lang="en">Deprotonation of NH protons, of four diorgano‐, organo(trimethylsilyl)‐ and bis(trimethylsilyl)hydrazines by n‐butyllithium in hexane led to the following lithium hydrazides: [Et‐(Li)N‐N(H)Et]6, (1)6, [Me3Si(Li)N‐N(Li)SiMe3]4, (2)4, [Me3Si‐(Li)N‐N(Li)SiMe3 · (Me3Si)2N‐N(Li)SiMe3]2 (3)2, and [Ph‐(Li)N‐N(Li)SiMe3]4, (4)4, respectively. The structure determination by X‐ray methods at low temperature reveals butterfly‐shaped Li2N2 structural monomeric units which associate through “laddering” to the observed oligomers thereby generating penta‐ and hexacoordinated Li centers. N‐N bonds lengths of up to 1.556 Å suggest that negative charge accumulates at the nitrogen atoms of (1)6, (2)4, and (3)2. An amazing structure shows the red compound 4 where two Li ions are π‐sandwiched between two phenyl groups each. The compound can be looked at as a new type of a lithium lithiate complex, Li2[Li6N8Ph4(SiMe3)4], but short N‐C and N‐N bonds in the Li6N8 core indicate that its negative charge is transferred to the phenyl groups.</div>
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Structural Chemistry of Lithium Hydrazides

Structural Chemistry of Lithium Hydrazides

Source :

English descriptors

Abstract

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