Putting a New Spin on Supramolecular Metallacycles: Co3 Triangle and Co4 Square Bearing Tetrazine-Based Radicals as Bridges.
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The synthesis of two new radical-bridged compounds [Co3(bptz)3(dbm)3]2toluene (1) and [Co4(bptz)4(dbm)4]4MeCN (2) (bptz = 3,6-bis(pyridyl)-1,2,4,5-tetrazine; dbm = 1,3-diphenyl-1,3-propanedionate) is reported. The presence of the ligand-centered radical has been confirmed by X-ray crystallography and SQUID magnetometry. These complexes are the first metallacycles bearing nitrogen heterocyclic radicals as bridges. Magnetic studies reveal strong antiferromagnetic metalradical coupling with coupling constants of J = -67.5 and -66.8 cm-1 for 1 and 2, respectively. DFT calculations further support the strong antiferromagnetic coupling between CoII ions and bptz radicals and confirm S = 3 and S = 4 spin ground states for 1 and 2, respectively.
author list (cited authors)
Alexandropoulos, D. I., Dolinar, B. S., Vignesh, K. R., & Dunbar, K. R.
complete list of authors
Alexandropoulos, Dimitris I||Dolinar, Brian S||Vignesh, Kuduva R||Dunbar, Kim R