Synthesis and crystal structure of the mixed lithium sodium guanidide [Li4Na2{NC(NMe2)2}6]: A stack of three (metal-nitrogen)2 dimeric rings with additional intramolecular (tertiary amine) nitrogen-lithium coordinations

N.D.R. Barnett, Robert Mulvey, William Clegg, Paul A. O'Neil

Research output: Contribution to journalComment/debate

9 Citations (Scopus)

Abstract

The tetralithium disodium guanidide [Li4Na2{N=C(NMe2)2}6], crystallized from a 1 : 1 : 2 Bu(n)Li : Bu(n)Na : HN=C(NMe2)2 mixture, has been studied by X-ray crystallography and found to be related to the ketimide [Li4Na2{N=C(Ph)But}6], reported earlier as having a stacked-core of three (metal-nitrogen)2 ring dimers with Li+ and Na+ cations in end rings and the central ring, respectively. However, it also displays a unique feature: intramolecular donor-acceptor interactions which connect dimethylaminonitrogen atoms project from the central ring to Li+ cations in the end rings. Although these interactions are long range (average length 2.304 angstrom, cf. 2.139 angstrom for Li-N core bonds), they still significantly influence the core bonding as evidenced by an analysis of bond lengths and bond angles.

LanguageEnglish
Pages2809-2812
Number of pages4
JournalPolyhedron
Volume11
Issue number21
DOIs
Publication statusPublished - Nov 1992

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Lithium
Amines
Cations
amines
Nitrogen
lithium
Crystal structure
Positive ions
Metals
Sodium
sodium
nitrogen
crystal structure
rings
X ray crystallography
Bond length
synthesis
Dimers
metals
Atoms

Keywords

  • crystal structure
  • lithium
  • sodium

Cite this

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title = "Synthesis and crystal structure of the mixed lithium sodium guanidide [Li4Na2{NC(NMe2)2}6]: A stack of three (metal-nitrogen)2 dimeric rings with additional intramolecular (tertiary amine) nitrogen-lithium coordinations",
abstract = "The tetralithium disodium guanidide [Li4Na2{N=C(NMe2)2}6], crystallized from a 1 : 1 : 2 Bu(n)Li : Bu(n)Na : HN=C(NMe2)2 mixture, has been studied by X-ray crystallography and found to be related to the ketimide [Li4Na2{N=C(Ph)But}6], reported earlier as having a stacked-core of three (metal-nitrogen)2 ring dimers with Li+ and Na+ cations in end rings and the central ring, respectively. However, it also displays a unique feature: intramolecular donor-acceptor interactions which connect dimethylaminonitrogen atoms project from the central ring to Li+ cations in the end rings. Although these interactions are long range (average length 2.304 angstrom, cf. 2.139 angstrom for Li-N core bonds), they still significantly influence the core bonding as evidenced by an analysis of bond lengths and bond angles.",
keywords = "crystal structure, lithium, sodium",
author = "N.D.R. Barnett and Robert Mulvey and William Clegg and O'Neil, {Paul A.}",
year = "1992",
month = "11",
doi = "10.1016/S0277-5387(00)83642-6",
language = "English",
volume = "11",
pages = "2809--2812",
journal = "Polyhedron",
issn = "0277-5387",
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TY - JOUR

T1 - Synthesis and crystal structure of the mixed lithium sodium guanidide [Li4Na2{NC(NMe2)2}6]: A stack of three (metal-nitrogen)2 dimeric rings with additional intramolecular (tertiary amine) nitrogen-lithium coordinations

AU - Barnett, N.D.R.

AU - Mulvey, Robert

AU - Clegg, William

AU - O'Neil, Paul A.

PY - 1992/11

Y1 - 1992/11

N2 - The tetralithium disodium guanidide [Li4Na2{N=C(NMe2)2}6], crystallized from a 1 : 1 : 2 Bu(n)Li : Bu(n)Na : HN=C(NMe2)2 mixture, has been studied by X-ray crystallography and found to be related to the ketimide [Li4Na2{N=C(Ph)But}6], reported earlier as having a stacked-core of three (metal-nitrogen)2 ring dimers with Li+ and Na+ cations in end rings and the central ring, respectively. However, it also displays a unique feature: intramolecular donor-acceptor interactions which connect dimethylaminonitrogen atoms project from the central ring to Li+ cations in the end rings. Although these interactions are long range (average length 2.304 angstrom, cf. 2.139 angstrom for Li-N core bonds), they still significantly influence the core bonding as evidenced by an analysis of bond lengths and bond angles.

AB - The tetralithium disodium guanidide [Li4Na2{N=C(NMe2)2}6], crystallized from a 1 : 1 : 2 Bu(n)Li : Bu(n)Na : HN=C(NMe2)2 mixture, has been studied by X-ray crystallography and found to be related to the ketimide [Li4Na2{N=C(Ph)But}6], reported earlier as having a stacked-core of three (metal-nitrogen)2 ring dimers with Li+ and Na+ cations in end rings and the central ring, respectively. However, it also displays a unique feature: intramolecular donor-acceptor interactions which connect dimethylaminonitrogen atoms project from the central ring to Li+ cations in the end rings. Although these interactions are long range (average length 2.304 angstrom, cf. 2.139 angstrom for Li-N core bonds), they still significantly influence the core bonding as evidenced by an analysis of bond lengths and bond angles.

KW - crystal structure

KW - lithium

KW - sodium

U2 - 10.1016/S0277-5387(00)83642-6

DO - 10.1016/S0277-5387(00)83642-6

M3 - Comment/debate

VL - 11

SP - 2809

EP - 2812

JO - Polyhedron

T2 - Polyhedron

JF - Polyhedron

SN - 0277-5387

IS - 21

ER -