title: Synthesis, structure and magnetism of homodinuclear complexes of Co, Ni and Cu supported by a novel bitriazine scaffold.
abstract: Btzn (1), an amine-functionalized bi(1,3,5-triazine) 4,4'-(NH(2))(2)-6,6'-(NHC(6)H(5))(2)-2,2'-(1,3,5-C(3)N(3))(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)Co(2)(NCS)(4)(EtOH)(2)(DMF)(2)], (2), [(Btzn)Ni(2)(η(1)-ONO(2))(2)(MeOH)(4)(DMF)(2)]·2[NO(3)], (3), [(Btzn)Cu(2)Cl(4)(DMF)(2)], (4), and [(Btzn)Cu(2)(η(2)-O(2)NO)(2)(OH(2))(2)(DMF)(2)]·2[NO(3)], (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.
authors: Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Canada.
authors: Derek J
authors: DJ
authors: Reid
authors: John E W
authors: JE
authors: Cull
authors: Kimberley D S
authors: KD
authors: Chisholm
authors: Alexandre
authors: A
authors: Langlois
authors: Po-Heng
authors: PH
authors: Lin
authors: Jérôme
authors: J
authors: Long
authors: Olivier
authors: O
authors: Lebel
authors: Ilia
authors: I
authors: Korobkov
authors: Ruiyao
authors: R
authors: Wang
authors: James D
authors: JD
authors: Wuest
authors: Muralee
authors: M
authors: Murugesu
authors: Jennifer
authors: J
authors: Scott