Cai-Ming Liu

Crystal structure and some properties of a novel potent Cu2Zn2SOD model schiff base copper(II) complex ∗[Cu(bppn)](ClO4)2∗2 · H2O

Abstract The compound ∗[Cu(bppn)](ClO 4 ) 2 ∗ 2 · H 2 O (where bppn = N,N′-propylenebis[2-benzoylpyridineiminato]) was prepared by reaction of 2-benzoylpyridine and 1,3-propanediamine with copper perchorate in ethanol and characterised by X-ray crystallography. The central Cu atom in two crystallographical non-equivalent [Cu(bppn)] 2+ cations exhibited a slightly distorted tetrahedral geometry with the CuN bond distances of 1.967(5)–2.010(5) A and 1.966(5)–2.000(5) A, respectively. The electronic absorption e 646 was 194 M −1 cm −1 . The EPR parameters g ⊥ = 2.051 and g ‖ = 2.226 were in accordance with the respective values of intact Cu 2 Zn 2 superoxide dismutase (Cu 2 Zn 2 SOD). Its electronic property displayed a single quasiversible one—electron reduction process at − 0.204 V with ΔE p = 84 mV, suggesting the title complex possesses high superoxide dismutase (SOD) activity.

A novel, more vivid Cu2Zn2SOD model: crystal structure and some properties of the Schiff base copper(II) complex: [Cu(appn)](ClO4)2·H2O

Abstract The novel Cu2Zn2 superoxide dismutase (Cu2Zn2SOD) mimic compound [Cu(appn)](ClO4)2·H2O [where appn = N,N′-propylenebis(2-actoylpyridineiminato)] has been prepared. Single-crystal X-ray analysis revealed that the copper(II) ion has a distorted square-pyramidal environment very similar to that of Cu2Zn2SOD: the basal positions are occupied by four nitrogen atoms from the Schiff base ligand and the apical position by an oxygen atom of a hydrate molecule. The CuN and CuO bond lengths are 1.972(2)…2.029(2) and 2.326(2)A, respectively.

Crystal structure and novel magnetic property of a three-dimensional manganese(II)-μ-1,3-azido system

Abstract The synthesis, and crystal structure at room temperature of the three-dimensional manganese(II) complex with bridging 4,4′-bipyridine [Mn(4,4′-bipy) (N3)2]n, in which the coordination mode of the azido ligand is end-to-end, are presented. The magnetic behavior for this compound is studied to show a weak antiferromagnetism to ferromagnetism transition at about 50 K, and is attributed to a canting phenomenon.

Crystal structure and spectroscopic and magnetic properties of a novel cis-4,4′-bipyridine polymeric complex of NiII: cis-catena-(μ-4,4′-bipy) [Ni(Et-XA)2]·0.5EtOH·CHCl3

Abstract The complex [4,4′-bipy-Ni(Et-XA)2·0.5EtOH·CHCl3]n (where Et-XA = ethylcarbonadithiolate and 4,4′-bipy = 4,4′-bipyridine), has been synthesized and crystallographyically characterized. It constitutes the first nickel(II) chain structure with 4,4′-bipyridine bridges having a cis-conformation. The magnetic susceptibility measurement for this compound shows simple Curie-Weiss law with θ =1.3 K in the temperature range of 5 K–300 K, which indicates no magnetic interaction between the nickel(II) ions through 4,4′-bipy bridges.

Synthesis and the first structural characterization of a metal complex of rhodamine 6G, R2[CdCl4] · EtOH · H2O (R = 9-(2-ethoxy-carbonylphenyl)-3,6-bis(ethylamino)-2,7-dimethylxanthylium)

Abstract Bis(9-(2-ethoxycarbonyl)phenyl-3,6-bis(ethylamino)-2,7-dimethylxanthylium) tetrachlorocadmate(II) monohydrate monoethanol solvate was obtained by the reaction of rhodamine 6G with CdCl2 · 2.5H2O under reflux for 3 h, and its crystal and molecular structure was determined by X-ray diffraction. The complex belongs to the triclinic space group P 1 , with a = 11.687(1), b = 12.581(1), c = 20.773(1) A , α = 99.56(1), β = 99.85(1), γ = 96.58(1)°, Z = 2; R1 = 0.0537 for 7657 (wR2 = 0.163) unique reflections with I>2σ(1). The anion CdCl42− exhibits a very slightly distorted tetrahedron with CdCl bond distances of 2.444(2)–2.466(1) A. The IR, XPS and fluorescence properties of R2[CdCl4] are also briefly discussed.

Molecular recognition of organic non-linear optical material by bis(perchlorate)tris(phenanthroline)cadmium(II)

Abstract The crystallization of bis(perchlorate)tris(phenanthroline)cadmium(II) [Cdphen 3 ·(ClO 4 ) 2 ] in the presence of para -nitroaniline (PNA) yielded a co-crystal 1: 2, adduct, Cdphen 3 (ClO 4 ) 2 ·PNA ( 1 ); which exhibits weak second-harmonic-generation activity even though it has a centrosymmetric space group.

A novel molecular channel: thermal analyses and X-ray structure of [Ni(Et-XA)2 · phen] · 3H2O (Et-XA = ethylcarbonodithiolato-S,S′, phen = phenanthroline)

Abstract The crystal structural determination reveals that bis(o-ethylcarbonodithiolato-S,S′)(1,10-phenanthroline-N1,N10)nickel(II) ([Ni(Et-XA)2 · phen] · 3H2O) forms a lattice inclusion compound with water molecules trapped in channels and grouped into triplets, within which exist very strong hydrogen bonds. The thermal analyses further confirms that the structure appears to be very stable and release of water molecules can be achieved only by the rupture of structure.

Guest-induced dimension change.A novel network intercalation complex: {[Cd(4,4′-bipy)2(H2O)2](CF3SO3)2(4,4′-bipy)(H2O)2(C7H8N2O3)2}∞

Abstract The reaction of Cd(CF3SO3)·6H2O with 4,4′-bipyridine in solution yields the 1D complex, {[Cd(4,4′-bipy)(H2O)4](CF3SO3)2}∞ (1). However, in the presence of 4-methoxy-2-nitroaniline, the same reaction gives a novel 2D intercalation layered complex {[Cd(4,4′-bipy)2(H2O)2](CF3SO3)2(4,4′-bipy)(H2O)2(C7H8N2O3)2}∞ (3) and a 1D intercalation complex {[Cd(4,4′-bipy)(CF3SO3)2(H2O)2](4,4′-bipy)}∞ (2) was obtained under ethanothermal conditions. Crystal data for the complexes are as follows. 1: crystal system, orthorhombic; space group, Ibam; a=11.6084(7), b=12.3793(7), c=15.2789(9) A; Z=4. 2: crystal system, orthorhombic; space group, Pccn; a=7.9908(4), b=15.3013(8), c=23.404(1) A; Z=4. 3: crystal system, monoclinic; space group, C2/c; a=20.505(1), b=11.8106(7), c=23.266(1) A; β=104.186(1)°; Z=4.

MOLECULAR RECOGNITION OF AN ORGANIC MOLECULE THROUGH A TWO DIMENSIONAL SQUARE NETWORK INCLUSION COMPLEX. SYNTHESIS AND CRYSTAL STRUCTURE OF [Cd(4,4′-bpy)2(H2O)2] (BF4)2 · 2(4,4′-bpy) · (C6H6N2O2) · 2H2O

Abstract The 2D square network complex [Cd(4,4′-bpy)2(H2O)2] (BF4)2 · 2(4,4′-bpy) · (C6H6N2O2) · 2H2O (1) (where 4,4′-bpy = 4,4′-bipyridine and C6H6N2O2 = o-nitrobenzenamine) has been prepared by reaction of Cd(BF4)2 · 6H2O and 4,4′-bpy in the presence of o-nitrobenzenamine. High shape selectivity was observed in this self-assembly process. Single crystal X-ray analysis revealed that 1 possesses a 2D square network of [Cd(4,4′-bpy)2(H2O)2] cations, which are made up of layers stacked upon each other. The o-nitrobenzenamine molecule is 2-fold disordered over a centre of inversion in the same plane as the cationic network. Uncoordinated 4,4′-bpy molecules as well as uncoordinated water molecules and BF4 − counter anions are intercalated between the cationic network layers. Extensive hydrogen-bonding is observed to stabilize this crystal packing.

Synthesis and crystal structure of a novel zinc(II) complex [Zn(pbp)2](ClO4)2

Abstract The complex [Zn(pbp) 2 ](ClO 4 ) 2 [pbp=N-(1-(2-pyrid-2-yl)benzoylidene)1,3propanediamine] was obtained by reaction of 2-benzoylpyridine and 1,3-propane diamine with zinc perchlorate in ethanol. A single crystal X-ray study shows that the complex is monomeric with the zinc atom coordinated by six nitrogen atoms from two singly neutral tridentate ligands to form a distorted octahedral geometry. The Zn—N bond lengths range from 2.070(5) to 2.123(6) A.