Xi-Lan Hu

Synthesis and Crystal Structure of A New Dinuclear Cu(II) Complex

A new dinuclear copper(II) complex was synthesized by reaction of 5,5‐diphenylimidazoline‐2,4‐dione (phenytoin, PHT), 3‐amino‐1‐propanol(PA) and copper acetate. Its crystal structure was determined by single crystal X‐ray diffraction. The compound crystallizes in the monoclinic system, space group C2/c with a=28.429(10), b=8.328(3), c=17.863(7) Å, β=111.189(6)°; V=3943(2) Å3, Mr=833.87, Z=4, F(000)=1736, Dc=1.405 g/cm3, μ=1.137 mm−1, the final R=0.0699 and wR=0.1737. The symmetric unit is comprised of four molecules. The complex is a centrosymmetric plane in which each copper(II) is coordinated in the quadrilateral plane to the ligand phenytoin through the deprotonated oxygen atom of 3‐amino‐1‐propanol as well as the nitrogen atoms of imine and amine. The Cu(II)…Cu(II) average distance is 3.005 (19) Å.

Hydrothermal Synthesis, Crystal Structures and Thermal Properties of Two Novel Coordination Polymers Constructed from α-Naphthylacetic Acid

Two novel coordination polymers, [Ni(η2-NAA)2(μ2-4,4′-bipy)]n (1) and [Pb2(μ2-η2-NAA)4]·CH3OHn (2) (HNAA = α-naphthylacetic Acid, 4,4′-bipy = 4,4′-bipyridine) have been synthesized and characterized by X-ray single-crystal diffraction analysis. In 1, bridging ligands 4,4′-bipy link adjacent [Ni(η2-NAA)2]n units to form a one-dimensional (1-D) chain structure. The μ2-η2-NAA− ligands link adjacent Pb(II) ions forming an infinite 1-D chain in 2. The thermal properties of the two complexes have been investigated as well.

Bis(ethyl­enediamine-κ2N,N′)bis­(phenytoinato-κN)cobalt(II)

The title compound [systematic name: bis(2,5-dioxo-4,4-diphenylimidazolidin-1-ido-κN 1)bis(ethylenediamine-κ2 N,N′)cobalt(II)], [Co(C15H11N2O2)2(C2H8N2)2], has site symmetry . The CoII cation is located on an inversion center and coordinated by two phenytoin anions and two ethylenediamine ligands in a distorted octahedral geometry. In the phenytoin anion, the two phenyl rings are twisted with respect to the central hydantoin ring, making dihedral angles of 77.49 (16) and 64.55 (15)°. Intramolecular and intermolecular N—H⋯O hydrogen bonding is present in the crystal structure.

Bis(5,5-diphenyl­hydantoinato-κN3)(ethyl­enediamine)zinc(II)

In the title compound, [Zn(C15H11N2O2)2(C2H8N2)], the ZnII atom is coordinated in a distorted tetrahedral geometry. Intramolecular N—H⋯O, C—H⋯O and C—H⋯N hydrogen bonds occur. In the crystal, molecules are linked by intermolecular N—H⋯O hydrogen bonds, forming a three-dimensional network.

Bis(2,4-dioxo-5,5-diphenyl­imidazol­idin­ido-κN3)bis­(propane-1,3-diamine-κ2N,N′)cobalt(II)

The complex molecule of the title compound, [Co(C15H11N2O2)2(C3H10N2)2], has crystallographically imposed inversion symmetry. The CoII atom displays a distorted octahedral coordination geometry. In the phenytoin anion, the two phenyl rings form dihedral angles of 62.26 (8) and 57.47 (9)° with the central imidazole ring. Intramolecular N—H⋯O and C—H⋯O hydrogen bonds occur. In the crystal, N—H⋯O and C—H⋯O hydrogen bonds forming a three-dimensional network.

A Novel Cobalt(II) Dinuclear Complex Constructed from α-Naphthylacetic Acid: Hydrothermal Synthesis, Crystal Structure, and Thermal Properties

The dinuclear complex, [Co2(μ2-NAA)2(NAA)2(phen)2(H2O)] (1) (HNAA = α-naphthylacetic acid, phen = 1,10-phenanthroline) (C72H54N4O9Co2, M r = 1237.05) was synthesized and structurally characterized by means of X-ray single-crystal diffraction. It crystallizes in triclinic, space group P − 1 with a = 8.6410(15), b = 18.536(3), c = 20.471(4) Å, α = 67.690(2), β = 79.022(2), γ = 79.156(2)°, V = 2953.5(9) Å3, Z = 2, D c = 1.391g/cm3, F(000) = 1280, μ(MoKα) = 0.627 mm−1, T = 291(2) K, the final R = 0.0572 and wR = 0.1533 for 10688 observed reflections with I > 2σ(I). In this complex, the μ2-NAA− ligands and one oxygen atom of water link two Co(II) ions forming a dinuclear complex. The thermal properties of the complex were investigated as well.

trans-Bis(5,5-diphenyl­hydantoinato-κN3)bis­(propane-1,2-diamine-κ2N,N′)nickel(II)

The asymmetric unit of the title complex, [Ni(pht)2(pn)2] (pht is 5,5-diphenylhydantoinate and pn is propane-1,2-diamine) or [Ni(C15H11N2O2)2(C3H10N2)2], contains one-half [Ni(pht)2(pn)2] molecule. The NiII atom is situated on a crystallographic center of inversion and shows a distorted octahedral coordination geometry. A three-dimensional network structure is assembled by inter- and intramolecular N—H⋯O=C interactions.