Syntheses, Crystal Structures, and Magnetic Properties of Metal–Organic Hybrid Materials of Mn(II)/Co(II): Three-Fold Interpenetrated α‑Polonium-like Network in One of Them

Three new 1,4-phenylenediacrylate bridged Mn­(II) and Co­(II) complexes of molecular formulas {[Mn2­(ppda)­(phen)4­(H2O)2]­(ppda)2­(H2O)} (1), {[Co­(ppda)­(dpyo)­(H2O)3]·4­(H2O)}n (2), and {[Co­(ppda)­(bpe)]·(0.5H2O)}n (3) [ppda = 1,4-phenylenediacrylate; phen = 1,10-phenanthroline; dpyo = 4,4′-dipyridyl N,N′-dioxide; bpe = 1,2-bis­(4-pyridyl)­ethane] have been synthesized and characterized by elemental analysis, IR spectra, single-crystal X-ray diffraction studies, and low-temperature magnetic measurements. The structural determination reveals that complex 1 is a discrete dinuclear species, 2 is a 1D polymeric chain, while 3 is a three-fold interpenetrated α-polonium network. Hydrogen-bonding interactions, formed by coordinated and/or lattice water molecules with ppda oxygen and π–π stacking interactions of aromatic rings, lead to a 3D supramolecular architecture in both complexes 1 and 2. Low-temperature magnetic study shows antiferromagnetic coupling in all the complexes. In addition, their electronic and fluorescent spectral properties have been investigated.