Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 128, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.2838987
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The performance of the M06 family of exchange-correlation potentials for describing the electronic structure and the Heisenberg magnetic coupling constant (J) is investigated using a set of representative open-shell systems involving two unpaired electrons. The set of molecular systems studied has well defined structures, and their magnetic coupling values are known experimentally. As a general trend, the M06 functional is about equally as accurate as B3LYP or PBE0. The performance of local functionals is important because of their economy and convenience for large-scale calculations; we find that M06-L local functional of the M06 family largely improves over the local spin density approximation and the generalized gradient approximation. (c) 2008 American Institute of Physics.
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