Strong magnetic exchange coupling in a radical-bridged trinuclear nickel complex

Luming Yang; Julius J Oppenheim; Mircea Dincă

doi:10.1039/d2dt01337a

Strong magnetic exchange coupling in a radical-bridged trinuclear nickel complex

Dalton Trans. 2022 Jun 7;51(22):8583-8587. doi: 10.1039/d2dt01337a.

Authors

Luming Yang¹, Julius J Oppenheim¹, Mircea Dincă¹

Affiliation

¹ Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA. Mdinca@mit.edu.

PMID: 35612004
DOI: 10.1039/d2dt01337a

Abstract

Reaction of 2,3,6,7,10,11-hexaaminotriphenylene hexahydrochloride (HATP·6HCl) and (Tp^PhNi)Cl (Tp^Ph = tris(3,5-diphenyl-1-pyrazolyl)borate) produces the radical-bridged trinickel complex [(Tp^PhNi)₃(HITP)] (HITP^3-˙ = 2,3,6,7,10,11-hexaiminotriphenylene). Magnetic measurements and broken-symmetry density functional theory calculations reveal strong exchange coupling persisting at room temperature between HITP^3-˙ and two of the three Ni²⁺ centers, a rare example of strong radical-mediated magnetic coupling in multimetallic complexes. These results demonstrate the potential of radical-bearing tritopic HITP ligands as building blocks for extended molecule-based magnetic materials.