delta G calculations

[Paddy Kane <94970459 $#at#$ vax1.dcu.ie>]

  Hi CCL'ers
  I am a HyperChem user and I wish to carry out calculate delta G of
 complexationfor complexes formed between calixarenes and metal ions. HyperChem
 cannot
 handle delta G calculations, so I enquired about the MOPAC software as it can
 open files in *.zmt format and HyperChem can save files in this format.
 However Richard Counts of the QCPE informs that MOPAC can handle molecules with
 at most 80 hydrogens and at most 80 non-hydrogens. However the molecules of
 interest to me typically have at least 100 of both types of atoms.
  So, what I would like to know if there is software available which
 a) can carry out delta G calculations on the complexes of interest to me
 b) is compatible with MS-DOS 6.2 or WINDOWS 3.1 or WINDOWS 95
 c) opens files in a format compatible with HyperChem
  Obviously, the first two requirements are essential while the last one is
 desirable.
  Regards,
  Paddy.
  Paddy Kane
  School of Chemical Sciences
  Dublin City University
  Ireland
  94970459
  e.mail 94970459 $#at#$ vax1.dcu.ie