Synthesis, structure and magnetism of homodinuclear complexes of Co, Ni and Cu supported by a novel bitriazine scaffold

Derek J. Reid, John E.W. Cull, Kimberley D.S. Chisholm, Alexandre Langlois, Po Heng Lin, Jérôme Long, Olivier Lebel, Ilia Korobkov, Ruiyao Wang, James D. Wuest, Muralee Murugesu, Jennifer Scott*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Btzn (1), an amine-functionalized bi(1,3,5-triazine) 4,4′-(NH 2)2-6,6′-(NHC6H5) 2-2,2′-(1,3,5-C3N3)2, is reported, and its coordination with Co, Ni and Cu is explored. Reactions of metal salts (2 equiv) with Btzn (1 equiv) result in dimeric species [(Btzn)Co2(NCS)4(EtOH)2(DMF)2], (2), [(Btzn)Ni21-ONO2)2(MeOH) 4(DMF)2]·2[NO3], (3), [(Btzn)Cu 2Cl4(DMF)2], (4), and [(Btzn)Cu 22-O2NO)2(OH2) 2(DMF)2]·2[NO3], (5). These complexes are the first examples of the coordination of transition metals with bi(1,3,5-triazine) ligands. Their structures display a bridging bis-bidentate coordination mode for Btzn. Variable-temperature magnetic susceptibility of the complexes reveals antiferromagnetic exchange between the spin carriers, with calculated exchange coupling values (J) of -4.7 cm-1 for 3, -18.2 cm-1 for 4, and -5.5 cm-1 for 5. An in-depth evaluation of the metal geometry highlights the inefficient overlap of the magnetic d-orbitals through the bridging ligand, most likely leading to reduced delocalization and coupling.

Original languageEnglish
Pages (from-to)5009-5017
Number of pages9
JournalDalton Transactions
Volume40
Issue number18
DOIs
Publication statusPublished - 14 May 2011
Externally publishedYes

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