  With recent advances in the areas of nanostructure fabrication and molecular
spintronics the idea of using single molecule magnets as building blocks for
the next generation electronic devices becomes viable. A particular example
represents a metal-organic complex in which organic ligands surround a
rare-earth element or transition metal. Recently, it was explicitly shown that
the relative position of the ligands with respect to each other can be
reversibly changed by the external voltage without any need of the chemical
modification of the sample. This opens a way of the electrical tuning of the
Kondo effect in such metal-organic complexes. In this work, we present a
detailed and systematic analysis of this effect in TbPc$_2$ from an ab initio
perspective and compare the obtained results with the existing experimental
data.
