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Structure of Sn(ND3)2F4—A Molecular Precursor for the Synthesis of Nitride Fluorides

✍ Scribed by Pat Woodward; Tom Vogt; Wolfram Weber; Eberhard Schweda

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
689 KB
Volume
138
Category
Article
ISSN
0022-4596

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✦ Synopsis

The molecular and crystal structure of Sn(ND 3 ) 2 F 4 has been determined at room temperature using high resolution neutron powder diffraction. The compound crystallizes in a monoclinic unit cell containing two formula units with a ‫؍‬ 7.7673(7) A s , b ‫؍‬ 6.2765(5) A s , c ‫؍‬ 5.1708(4) A s , ‫؍‬ 102.871(5)°, and spacegroup P2 1 /n. The structure consists of isolated tin-centered octahedra with ammonia groups in trans configuration. The intramolecular stability of this compound has been investigated using Hu¨ckel molecular orbital calculations. Compared to Si(NH 3 ) 2 F 4 , the metal-nitrogen bonding interaction is found to be stronger, while the metal-fluorine bond is weaker in Sn(ND 3 ) 2 F 4 . Due to a different hydrogen bonding network the intermolecular orientation and packing of the octahedral M(NH 3 ) 2 F 4 molecules in Sn(ND 3 ) 2 F 4 is different from the arrangement observed in Si(NH 3 ) 2 F 4 . The implications for the use of these compounds as molecular precursors for the synthesis of SiNF and SnNF are discussed.

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