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We report the first Co(II) based discrete and extended network materials comprising the 2,2′-biphenol ligand. We first present the synthesis and magnetic characterisation of the Co(II) dinuclear complexes [Co(II)2(L)2(py)4]·2EtOH (1) and [Co(II)2(L)2(4-pic)4].2LH2 (2), both of which exhibit antiferromagnetic exchange between their Co(II) centres. The introduction of the co-ligand 2-hydroxypyridine (2-hpH) leads to the production of planar octametallic complex [Co(II)8(OMe)2(L)4(LH)2(2-hp)4(MeCN)4]·MeCN (3). Magnetic susceptibility and magnetisation measurements on 3 indicate dominant ferromagnetic exchange between the Co(II) centres. We also describe the first Co(II)/2,2′-biphenol extended networks in the shape of the 1D coordination polymer {[Co(II)(LH)(4,4-tmdp)2(NO3)](LH2)}n (4) (where 4,4′-tmdp = 4,4′-trimethylenedipyridine) and the 2D brickwall network [Co(II)(LH)(trans-bpe)1.5(NO3)] (5) (where trans-bpe = trans-1,2-bis(4-pyridyl)ethylene), comprising T-shaped nodes.

Old dog, new tricks: 2,2′-biphenol as a bridging and book-end ligand in discrete and extended Co(ii) architectures