Tailored construction of novel Nickel (II) and Manganese (II) coordination polymers based on tris(p-carboxylphenyl)phosphine oxide

Five metal–organic coordination polymers constructed from tris(p-carboxylphenyl)phosphine oxide (TPO), namely, [Ni3(TPO)2(2,2′-bipy)2(H2O)6]n·2nH2O (1), [Ni3(TPO)2(phen)2(H2O)6]n·2nH2O (2), [Ni3(TPO)2(bpe)3(H2O)8]n·4nH2O (3), [Mn(TPO)(2,2′-bipy)(H2O)]n·nH2O (4) and [Mn(BPO)(phen)]n (5) (BPO = bis(4-carboxylphenyl)phosphinic acid, bpe = trans-1,2-bis-(4-pyridyl)ethylene, 2,2′-bipy = 2,2′-bipydine, phen = 1,10-phenanthroline), were hydrothermally synthesized and determined by single-crystal X-ray diffraction analyses. Both of the bpy and phen ligands tailor the NiII complexes 1 and 2 into the ladder-like 1D chain geometries, while the bpe as a bridging ligand leads the NiII complex 3 to form a 2D plane geometry. It is interesting to find that the 2,2′-bipy and phen play a different role in the construction of MnII complexes 4 and 5; where complex 4 crystallizes in a chiral P212121 space group, while a new BPO ligand is formed from the in situ reaction of TPO in 5. Each PO group of BPO in 5 links with two MnII ions leading to new [Mn2(PO)2] cluster, and the clusters are bridged by four BPO ligands to give a ring-like structure.