Is the Bonding of LiAlH4 Ionic or Covalent?

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Discussion Overview

The discussion centers on the nature of bonding in lithium aluminum hydride (LiAlH4), specifically whether it can be classified as ionic or covalent. Participants explore the characteristics of the bonding, including the roles of lithium ions and the AlH4 anion, and consider various bonding interactions.

Discussion Character

  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants propose that LiAlH4 exhibits ionic bonding due to the presence of Li+ and AlH4-, suggesting a straightforward ionic interaction.
  • Others argue that the bonding is primarily covalent, highlighting the covalent nature of the AlH4- anion and the presence of covalent bonds between aluminum and hydrogen.
  • A later reply mentions that while ionic bonding is present, the AlH4- anion itself is covalently bonded, and discusses the implications of polarization by Li+ on the covalent bonds within the tetrahedral structure.
  • One participant suggests using computational methods, such as the VASP package, to analyze the bonding characteristics through density of states (DOS) curves.

Areas of Agreement / Disagreement

Participants express differing views on the nature of bonding in LiAlH4, with some supporting the ionic perspective and others emphasizing the covalent aspects. The discussion remains unresolved with multiple competing views present.

Contextual Notes

Participants note that AlH4- contains covalent bonds, and there are discussions about the implications of these bonds on the overall bonding characterization of LiAlH4. The complexity of the bonding interactions is acknowledged, but no consensus is reached.

ilovechemistry
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hi guys, i need help on the bonding of LiAlH4. can it considered an ionic bonding because Li is Li+ and AlH4 is AlH4-. seems like a perfect ionic bonding situation to me. or is the bonding simply convalent, permanent-dipole permament-dipole attraction to be exact.
 
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ilovechemistry said:
hi guys, i need help on the bonding of LiAlH4. can it considered an ionic bonding because Li is Li+ and AlH4 is AlH4-. seems like a perfect ionic bonding situation to me. or is the bonding simply convalent, permanent-dipole permament-dipole attraction to be exact.


The tetrahedrons are inside them selfs covalently bonded and the Li+ will polarazie these entites a litle decreasing the ionic bonding a little. To calculate use VASP package and study the DOS-curve.
 
alright thnx , i guess i'll sort out a way to figure it out!
 
there is an ionic bonding when you consider Li+ and AlH4-
but, AlH4- is itself a covalent anion. there are 3 Al-H covalent bonds in this molecule... but AlH3 still has a vacant sub-orbital... coordinate covalent bond occurs... an H- bonds with the AlH3 forming AlH4-
 
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