Syntheses, structures, and magnetic properties of two MOFs based on V-shaped carboxylate and flexible spacer ligand: From binuclear Co(II) with alpha-Po net to trinuclear Mn(II) with 4(16).6(11).8 topology

摘要

Two mixed-ligand coordination polymers, namely, {[Co(oba)(4-bpdb)]center dot CH3OH}(n) (1), and {[Mn-3(oba)(3)(4-bpdb)(DMF)(2)]center dot 4H(2)O}(n) (2) (H(2)oba = 4,4'-oxybis-benzoate, 4-bpdb = 1,4-bis(4-pyridy1)-2,3-diaza-1,3-butadiene), were synthesized under solvothermal conditions. The structure of 1 possessed a three-fold interpenetrated 3D 6-connected pcu topology based on dimeric [Co-2(COO)(2)](2-) units. While 2 displayed a uninodal 3D 8-connected net with 4(16).6(11).8 topology based on trinuclear [Mn-3(COO)(6)] subunits. Magnetic analyses indicate that both two compounds show weak antiferromagnetic interactions within binuclear CO(II) and trinuclear Mn(II) units. (C) 2017 Elsevier B.V. All rights reserved.