Isolation and x-ray crystal structures of {Li2 [μ2 -As(SiMe3 )2 ][μ3 -As(SiMe3 )2 ](THF)}2 and [(Me3 Si)2 AsLi(THF)2 ]2
The lithium arsenides {Li2[p2-As(SiMe3)2] [p3-As(SiMe3)2](THF)}2 (I) (THF = tetrahydrofuran) and [(Me3Si)2AsLi(THF)2]2 (II) were isolated and their solid-state structures determined by X-ray methods. Compound I crystallizes in the monoclinic system, space group P2,/c, with a = 10.147(1)A, b = 19.665(2)A, c = 16.768(2) A, p = 107.78(1)° and Z = 2. The core structure consists of an [LiAs]4 ladder-like framework with four antiparallel adjacent As-Li rungs. The two lithium atoms of the central ring each bridge three arsenic centers while the two lithium atoms belonging solely to the outer rings each span two arsenic atoms and are coordinated to one THF molecule. Monoclinic crystals of compound II belong to space group C2/c, with a = 17.877(4) A, b = 14.077(3) A, c = 19.006(4) A, p = 109.16(2)“ and Z = 4. The structure consists of a centrosymmetric dimer containing a four-membered As-Li-As-Li ring wherein each lithium atom is coordinated to two molecules of THF. © 1995, Taylor & Francis Group, LLC. All rights reserved.
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- Inorganic & Nuclear Chemistry
- 3406 Physical chemistry
- 3402 Inorganic chemistry
- 0399 Other Chemical Sciences
- 0302 Inorganic Chemistry
Citation
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Inorganic & Nuclear Chemistry
- 3406 Physical chemistry
- 3402 Inorganic chemistry
- 0399 Other Chemical Sciences
- 0302 Inorganic Chemistry