ISSN:
0009-2940
Keywords:
Lithium compounds
;
Enediamide structure
;
1,4-Diaza-1,3-diene, protonated
;
Hydrogen bond
;
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
[Li2(THF)4DAD] and [DAD - H][ZrCl5(THF)]: New Types of Phenyl-;Substituted 1,4-Diaza-1,3-diene LigandsTwo extreme situations in 1,4-diaza-1,3-diene (DAD) chemistry are described. Reaction of phenyl-substituted DAD 1a - c with lithium in the molecular ratio of 1:2 affords in high yield the extremely air-sensitive complexes [Li2(THF)4DAD] (2a - c). The structure of 2b has been determined by X-ray diffraction. Each of the Li+ ions is coordinated by the two terminal N atoms of the s-cis-configurated DAD dianion and by two molecules of THF. Protonation of ZrCl4 · DAD (3a) by HCl in THF gives the ionic complex [ZrCl5(THF)][DAD - H] (4), which contains a protonated [DAD - H]+ cation. The structure of the sterically crowded N = C - C = N skeleton of the [DAD - H]+ cation is not influenced by the positive charge and adopts the unusual Z-gauche-Z conformation.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/cber.19931260110
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