Subject: parameters for fullerenes

From: "Mikhayl F.Budyka" <[email-masked]>
Date: Fri, 24 Nov 2000 09:50:33 +0300

Dear CCL'ers,

Semiempirical methods (AM1, PM3) are known to reproduce structural 
parameters but overestimate greatly the heats of formation of
fullerenes.

Does anybody know anything about special new parametrization (PM4?)
or additional parameters for PM3 for more precise calculation 
of the heats of formation of fullerenes?

Thanks in advance,

Mikhayl