Assessment of density functional approximations for calculation of exchange coupling constants in thiocyanato and cyanato double bridged binuclear Ni(II) complexes

Author:

Zlatar Matija1ORCID,Vlahovic Filip2ORCID,Mitic Dragana2ORCID,Zlatovic Mario3ORCID,Gruden Maja3ORCID

Affiliation:

1. University of Belgrade, Institute of Chemistry, Technology and Metallurgy, Belgrade, Serbia

2. Innovation center of the Faculty of Chemistry, University of Belgrade, Belgrade, Serbia

3. University of Belgrade, Faculty of Chemistry, Belgrade, Serbia

Abstract

In the present work, we examine the magnetic properties of 8 ?endto- end? thiocyanato, and 3 ?end-to-end? cyanato double bridged Ni(II) binuclear complexes. Thiocyanato complexes are weakly ferromagnetic. Cyanato bridged complexes exhibit weak antiferromagnetic coupling. Therefore, it is a challenge for computational chemistry to calculate the exchange coupling constant in these systems accurately. 17 different density functional approximations with different flavours are used to find the method of choice to study magnetic properties in binuclear Ni(II) complexes within the broken-symmetry approach. It is found that M06-2X and PWPB95 performed the best compared to the experimental values for the entire set of examined complexes. Furthermore, the magneto-structural correlation rationalizes the results.

Funder

Ministry of Education, Science and Technological Development of the Republic of Serbia

Publisher

National Library of Serbia

Subject

General Chemistry

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