Subject: Please explain about the different stable forms of ferrocene

Why is it that electron diffraction in the gas phase suggests the more stable 
conformation is eclipsed when in the solid state there is seen to be 
differently orientated molecules of ferrocene randomly distributed throughout 
the sample.  Also, in a model I made using CAChe (Oxford Molecular) I have 
found the Fe-C distance of an MM-optimised staggered model of ferrocene to be 
1.981 Angstrom, but values obtained by electron diffraction (found in texts) of 
gaseous ferrocene suggest a 2.07 Angstrom distance 

Re: Please explain about the different stable forms of ferrocene