Strictly localised molecular orbitals (SLMOs) describe molecular electronic structures in an intuitive way but with a limited accuracy. They proved to be useful in approximate methods among them in mixed QM/QM and QM/MM ones. They are appropriate to describe the effect of the environment to a central subsystem and to separate the subsystems. SLMOs appearing at the QM-MM boundary have the advantage that they allow a straightforward separation of the subsystems. Their application with semiempirical wave-functions is well established but their use with ab initio wave-functions requires the proper treatment of the overlap between the fixed SLMOs and the molecular orbitals of the QM subsystem. Methods using SLMOs to separate subsystems are reviewed and our recently proposed schemes to calculate either orthogonal or overlapping molecular orbitals interacting with fixed SLMOs are discussed in detail. Results of model calculations are presented to illustrate the performance of these new computational schemes.
|Title of host publication||Protein Modelling|
|Publisher||Springer International Publishing|
|Number of pages||19|
|ISBN (Print)||3319099752, 9783319099750|
|Publication status||Published - Jul 1 2014|
ASJC Scopus subject areas