What MOPAC is
|MOPAC (Molecular Orbital PACkage) is a semiempirical quantum chemistry
program based on Dewar and Thiel's NDDO approximation.
|MOPAC2012||MOPAC2012 is MOPAC2009 plus the PM7 and PM7-TS methods. It is currently in the beta test phase, and help in debugging is always appreciated. If a bug is detected, please send a message by E-mail to MrMOPAC@OpenMOPAC.net, along with an example illustrating the bug. To avoid buggy executables spreading, the beta test executables will be limited to 100 days. If you qualify for Academic not-for-profit use and already have a password for MOPAC 2009, go straight to download, otherwise request a password and download.|
|PM7||PM7 is a modified form of PM6. A few errors
in NDDO theory that affect large systems have been removed. All atomic
and diatomic parameters were re-optimized. Average errors in organic
compounds have been reduced by ~10%, and errors in large organics and
have been significantly reduced, see
|MOPAC2012 MOPAC2009, PM6|
|Instructions and Manual||A manual
is available for MOPAC2012. Please try finding answers to questions
there before sending an E-mail message requesting help.
|Maintenance record||MOPAC2012 is under constant
maintenance. If your copy of MOPAC2012
does not work correctly, check the maintenance record to see if there is a
more up-to-date version.
|PM6 is a re-parameterization of the NDDO method. Three modifications to the approximations
these mainly affect the way the core-core interaction was defined.
Parameters were optimized for most elements, the exceptions being 12 of the
lanthanides and all of the actinides. The lanthanides can be
represented by sparkles. For details, see the on-line
PM6 journal article, and its
Downloads of source and binaries for the various
older versions of MOPAC are
|History||MOPAC was started in 1981, and has been under
continuous development since then.
|Older MOPAC Programs||MOPAC2009 is
MOPAC2007 plus the MOZYME function. MOZYME is a linear-scaling SCF
method that allows systems of up to 15,000 atoms to be modeled.
MOPAC2007 was an improved version of MOPAC 7.1. In addition to the methods in MOPAC 7.1, it also included RM1 and PM6.
MOPAC 7.1 is a FORTRAN 90 version of MOPAC 7. It supports the methods: MNDO, AM1, and PM3, as well as Sparkle/AM1 for the lanthanides. All published NDDO parameter sets were supported. It is fully in the public domain. (Download source)
|Availability||Windows, Linux, and Mac versions are
|Cooperative Development||The purpose of this site is to encourage
cooperative development. There is a
default mechanism for contributing
|Acknowledgment||This work was funded by the National
Institute of General Medical Sciences (NIGMS), Grant No. 2 R44 GM067327-02|
|Contacts||James Stewart, 15210 Paddington Circle,
Colorado Springs, CO 80921|
E-mail : MrMOPAC@OpenMOPAC.net
SKYPE: Jimmy.Stewart2 (between 1500 and 2200 GMT)