Synthesis, structure, and magnetic properties of a dinuclear antiferromagnetically coupled iron(II) complex

The authors acknowledge the Algerian DGRSDT (Direction Générale de la Recherche Scientifique et du Développement Technologique) and Université Ferhat Abbas Sétif 1 for financial support.A new dinuclear Fe(II) complex with the general formula [Fe2(1,4-tpbd)(dca)4(H2O)2] ( 1 ) (in which 1,4-tpbd = N,N,N′,N′-tetrakis(2-pyridylmethyl)benzene-1,4-diamine; dca = dicyanamide, [N(CN)2]−), has been prepared under hydrothermal conditions and fully characterized by elemental analysis, infrared spectroscopy, X-ray diffraction, and magnetic measurements. The compound crystallizes in the triclinic system and P-1 space group with Z = 1 and the following unit cell parameters: a = 8.165(5) Å, b = 10.236(5) Å, c = 13.105(5) Å, α = 81.421(5)°, β = 78.810(5)°, γ = 72.941(5)°, and V = 1022.2(9) Å3. The Fe(II) ions are six-coordinated, in distorted octahedral fashion, by three N atoms of tpbd ligand, one water oxygen atom and two N atoms of two dicyanamide anions. The intra-dinuclear Fe⋯Fe distance via the bridged μ2-tpbd ligand is 8.293(8) Å. In the molecular arrangement, the combination of OH⋯N and CH⋯N hydrogen bonds links the title complex to form a three-dimensional supramolecular structure. Magnetic susceptibility measurements (2–300 K) show that 1 presents weak antiferromagnetic exchange between the two nearest Fe2+ ions with the coupling constant J = −1.05 cm−1.PostprintPeer reviewe

Maternal and perinatal outcomes in pregnant women with first trimester vaginal bleeding.

Objective: To study the pregnancy outcomes in first trimester vaginal bleeding. Materials and methods: This cross sectional study was done on 60 pregnant women with first trimester vaginal bleeding referring to university hospitals affiliated to Islamic Azad University, Tehran, Iran. All women were evaluated for the outcomes including abortion, preterm rapture of membranes, preterm labor, second and third trimester vaginal bleeding, low birth weight and intra uterine growth retardation and the mode of delivery. Data were analyzed using SPSS- 11. Results: Placenta accreta, second trimester bleeding and preterm labor were significantly more prevalent in pregnant women with first trimester bleeding (P ≤ 0.05). Conclusion: According to results of present study vaginal bleeding in first trimester of pregnancy may predict further maternal and fetal complications. We recommend training pregnant women regarding those complications and their prevention

The first Fe(II) complex bearing end-to-end dicyanamide as a double bridging ligand : crystallography study and Hirshfeld surface analysis; completed with a CSD survey

The authors are indebted to the Algerian DG-RSDT (Direction Générale de la Recherche Scientifique et du Développement Technologique) and Université Ferhat Abbas Sétif 1. M.M. is grateful to Ferdowsi University of Mashhad Research Council for their financial support of this work.Two new polymeric, one and two-dimensional compounds [Fe(dmbpy) (μ1,5-dca)2] ( 1 ) and [Fe(4,4′-bpy) (μ1,5-dca)2].0.24(4,4′-bpy).0.5(EtOH) ( 2 ), in which dmbpy = 5,5′-dimethyl-bipyridine, dca = dicyanamide and 4,4′-bpy = 4,4′-bipyridine, has been synthesized under solvothermal conditions and fully characterized by elemental analysis, FT-IR spectroscopy and X-ray single crystal diffraction. Compound 1 , with a rare coordination environment, is the only well-known example in which end-to-end double bridged dca ligands and a bidentate bulky aromatic ligand (dmbpy) are coordinated simultaneously to the iron center. Structural analysis of compound 2 showed it is a novel two-dimensional coordination polymer, constructed from repetition of 4,4′-bpy and dca as a bidentate bridging ligand. Changing the co-ligand to 4,4′-bpy, lead to completely different structure geometry and network, which confirms the substantial effect of co-ligand. Furthermore, Hirshfeld surfaces analyses have been performed to help understand the packing.PostprintPeer reviewe