Six Co(II) Coordination Polymers Based on Two Isomeric Semirigid Ether-Linked Aromatic Tetracarboxylate Acid: Syntheses, Structural Comparison, and Magnetic Properties

Abstract

Abstract Six Co(II) coordination polymers including {[Co5(L1)2(bibp)2]·bibp}n (1), {[Co2(L1)(bibp)2·2H2O}n (2), {[Co2(L1)(bimmb)2]·DMF}n (3), [Co2(L1)(bimb)·3H2O]n (4), [Co(L2)(bibp)(H2O)]n (5), and [Co2(L2)(bimb)]n (6) (H4L1/H4L2= 5,5′-(1,4/1,3-phenylenebis(methoxy))diisophthalic acid, bibp= 4,4'-bis(imidazolyl)biphenyl, bimmb= 1,4-bis(imidazol-1-ylmethyl)benzene, and bimb= 1,4-bis(imidazol-1-ylmethyl)benzene) were synthesized under solvothermal conditions and structurally characterized. Complex 1 and 2 are co-crystallized in a one-pot reaction with significant differences in the structures. Complex 1 exhibits a three-dimensional (3D) metal-organic framework composed of an interesting pentanuclear [Co5(μ3-O)2N4(COO)8]2- cluster. Complex 2 shows a 3D four-fold interpenetrated bbf topological framework. Complex 3 has a 2D zigzag network, three of which further interpenetrate each other, reconstructing a 2D + 2D → 2D network with new-topology. Complex 4 shows a noval topological 3D framework with a [Co2(COO...