Showing papers by "George M. Sheldrick published in 1994"
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76 citations
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36 citations
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TL;DR: In this article, side-on and end-on-coordinated Li Cations to N2−2 and O 2−2 were found to be endon to NN units and also coordinated by thf, but three Li+ ions were also positioned symmetrically above the NN bonds.
Abstract: Dilithium N,N′-Bis(trimethylsilyl)hydrazide and a Hydrolysis Product: Side-On- and End-On-Coordinated Li Cations to N2−2 and O2−2
N,N′-Bis(trimethylsilyl)hydrazine is converted into the dilithium derivative [(Me3Si)2N2Li2] · 2 thf (1) by nBuLi. Compound 1 forms a tetramer which lies on a crystallographic inversion centre. The Li+ ions are found to be end-on to the NN units and also coordinated by thf, but three Li+ ions are also positioned symmetrically above the NN bonds. The hydrolysis of 1 in air leads to the formation of [(Me3SiOLi)4 · Li2O2 · LiN(SiMe3)2] · 2 thf (2) which contains four oxide and one peroxide ions. The O2−2 unit is side-on-coordinated by three Li+.
33 citations
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TL;DR: In this paper, the first example of a macrocycle containing pyridazine-diimine head units was presented, and the structure of [Pb2(4 + 4)](ClO4)4, 1, was described.
Abstract: Condensation of 3,6-diformylpyridazine with 1,3-diaminopropane in the presence of lead(II) template ions gives the first example of a macrocycle containing pyridazine-diimine head units, and only the second example of a [4 + 4] Schiff base macrocycle; the structure of [Pb2(4 + 4)](ClO4)4, 1, is described.
15 citations
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TL;DR: In this paper, the reaction of the diphosphene RfP=PRf (Rf = 2,4,6-tris(trifluoromethyl)phenyl) with red selenium affords the selenadiphosphirane 1.
Abstract: Reaction of the diphosphene RfP=PRf (Rf = 2,4,6-tris(trifluoromethyl)phenyl-) with red selenium affords the selenadiphosphirane 1. The X-ray crystal structure of 1 was investigated.
11 citations
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TL;DR: In this paper, X-ray structure determination of silylated phosphazenes of the type HN(PR₂NSiMe₃) has been investigated.
Abstract: Acylic silylated phosphazenes of the type HN(PR₂NSiMe₃)₂ (1) react quantitatively with molecules MMe₃ (M = Al, Ga, In) under ring formation and CH₄ evolution. The ring compounds N(PPh₂NSiMe₃)₂AlMe₂ (2 a) and N(PPh₂NSiMe₃)₂InMe₂ (4 a) have been investiga ted by X-ray structure determination. 2a and 4a crystallize in the space groups P 1 and P 3₁, respectively; they show different conformations regarding the cyclohexane framework. NMR spectroscopy of the nuclei in the chelating phosphazene ligand indicates decreasing Lewis acidity of the metal containing fragments in the series AlMe₂ ≥ GaMe₂ > InMe₂.
9 citations
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TL;DR: In this article, the Max Planck Society for the Advancement of Science under a Creative Commons Attribution 4.0 International License (CCA4.0 Lizenz) has published a collection of works under the name Naturforschung in Zusammenarbeit with der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V.
Abstract: für Naturforschung in cooperation with the Max Planck Society for the Advancement of Science under a Creative Commons Attribution 4.0 International License. Dieses Werk wurde im Jahr 2013 vom Verlag Zeitschrift für Naturforschung in Zusammenarbeit mit der Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. digitalisiert und unter folgender Lizenz veröffentlicht: Creative Commons Namensnennung 4.0 Lizenz. Darstellung und Struktur von 2.3-Bis[2,4,6-tris(trifluoromethyl)phenyl]-l,2,3-selenadiphosphiran
1 citations