I'd like some information about the strange ionic compound caesium auride to complete a Born-Haber cycle about its formation. I thought it would make a change from NaCl!

 

Does anyone know its enthalpy of formation or its lattice enthalpy? I've looked in every text we have and scoured the web, but without luck.

 

For the curious, Here's what I do know:

 

CsAu is ionic, with the Au- anion in a lattice that closely resemble CsCl. The Cs-Au distance is 369 pm. Atomisation enthalpies are 78.7 kJ/mol for Cs and 369 kJ/mol for Au. The ionisiation energy of Cs is 375.7 kJ/mol and the electron affinitiy of Au is -222.8 kJ/mol.

no, i honestly don't know the enthalpy of formation. it won't be easy to find anything on this. it's unlikely that you will find much information on cesium auride.

 

so...make some and test it

theres some infor here:

http://www.cs.rochester.edu/users/faculty/nelson/cesium/cesium_compounds.html

 

uve probly already seen tho