Journal
POLYHEDRON
Volume 207, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2021.115378
Keywords
Manganese complexes; Coordination polymers; Hydrazone; Oxime
Categories
Funding
- MOHERI, Oman [BFP/RGP/CBS/20/067]
- Canada Research Chairs program
- NSERC [2018-04255]
- C.F.I./O.R.F.
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A compound containing Mn(II) ions was synthesized, with magnetic studies revealing weak antiferromagnetic interactions between dinuclear units connected by different bridges, forming a magnetic 1-D chain structure.
The polydentate ligand LH mu contains bipyridine, hydrazone and oxime functionalities and reacts with Mn (CH3COO)(2)center dot 4H(2)O to afford an alternating one dimensional chain comprising Mn(II) ions, [{Mn-2(LH) (CH3COO)(3)(CH3OH)(2)}center dot CH3OH](n) (1). The structure of 1 contains two Mn(II) ions in the asymmetric unit; Mn-1 adopts an unusual pentagonal bipyramidal coordination geometry comprising an [N3O4] donor set, while Mn-2 adopts a more conventional octahedral geometry coordinated by an [NO5] donor set. The two manganese ions within the dinuclear unit are connected to each either via O-hydrazone and syn-syn O-acetate bridges. These dinuclear units are then linked by anti-anti Oacetate bridges, affording a magnetic 1-D alternating chain topology. Magnetic studies on 1 reveal the presence of weak antiferromagnetic interactions via O-hydrazone and O-acetate bridges. The magnetism of 1 was modelled using a dimer model [(H) over cap = 2J (S) over cap (1) (S) over cap (2)], with inter-dimer exchange modelled using a mean field term (zJ') to afford g = 2.046 +/- 0.002, J/k = -1.03 +/- 0.02 cm(-1) and zJ' = 0.06 +/- 0.01 cm(-1).
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