Photochemical and Magnetic Properties of Seven New Metal–Organic Frameworks Constructed by Flexible Tetrapyridines and V‑Shaped Polycarboxylate Acids

Seven
two- or three-dimensional (2D or 3D) coordination polymers
have been synthesized by tetrakis­(4-pyridyloxymethylene)­methane
(TPOM) with V-shaped 4,4′-oxybis­(benzoicacid) (H2oba), 4,4′-sulfonyldibenzoic acid (H2sdb),
4,4′-(hexafluoroisopropylidene)­bis­(benzoic acid) (H2hfipbb), 4,4′-dicarboxydiphenylamine (H2ddpa), and 4,4′-dicarboxy-ethyl diphenylamine (H2dedpa) in the presence of nitrates of transition metal in H2O/DMF systems, namely, {[Co2(TPOM)­(oba)2(H2O)2]­·(H2O)8}n (1), {[Cd2(TPOM)­(oba)2­(H2O)2]­·(H2O)4­(DMF)1.5}n (2), {[Ni2(TPOM)­(oba)2(H2O)2]­·(H2O)5}n (3), {[Co2(TPOM)­(hfipbb)2]­·(H2O)3}n (4), {[Cd2(TPOM)­(dedpa)2]­·(H2O)4­(DMF)2}n (5), {[Co2(TPOM)­(sdb)2]­·(H2O)3}n (6), {[Co2(TPOM)­(ddpa)2]}n (7). Complexes 1–3 have similar structures, possessing 3D self-penetrated frameworks.
Complex 4 is also a self-penetrated 3D framework containing
meso-helix [Co­(hfipbb)]n chains. Complex 5 reveals a 2-fold interlocked 2D → 2D network. For
complex 6, only three pyridyl groups coordinated to Co­(II)
ions in one TPOM ligand, while for complex 7, only two
pyridyl groups coordinated to Co­(II) ions in one TPOM ligand. In addition,
magnetic, fluorescence, and UV–vis properties of these complexes
have been studied.