I would like to know if a Mulliken population analysis to calculate spin densities is in general a valid choice. I see that it is made use of, for example here1. So up to-date researches apparently use it. On the other hand there seem to be more advanced methods (natural population analysis). Moreover Wikipedia states:
In principle, a complete basis set for a molecule can be spanned by placing a large set of functions on a single atom. In the Mulliken scheme, all the electrons would then be assigned to this atom.
So there is some ill definition for this method. This would not only account for charge analysis but also spin, if I am not mistaken.
Knowing that my basis set is reasonable; is there anything to consider that would make Mulliken spin density analysis doubtful?
- H-Bonding on spin centres enhances spin–spin coupling for organic diradicals by Francis Kirby B. Burnea, Yeonsig Nama and Jin Yong Lee, Journal of Materials Chemistry C, Issue 10, 2020 (link)