Yu-Xi Sun

{1,1′-[Propane-1,3-diyl­bis­(nitrilo­methyl­idyne)]­di-2-naphtholato}iron(II)

The title mononuclear iron(II) compound, [Fe(C25H20N2O2)], possesses Cs symmetry with the Fe atom located on a mirror plane. The metal atom is four-coordinated by two N atoms and two O atoms from the Schiff base ligand in an approximately square-planar configuration.

Di­chloro­[N,N‐di­methyl‐N'‐(pyridin‐2‐yl­methyl­idene)­ethane‐1,2‐di­amine]­zinc(II)

The title compound, [ZnCl2(C10H15N3)], is a mononuclear zinc(II) complex in which the ZnII atom is five-coordinated by three N atoms of the Schiff base ligand, and two Cl− anions, forming a distorted square-pyramidal coordination geometry.

Synthesis, Characterization and In Vitro Cytotoxicity of Diorganotin Complexes of 3,5-Dinitrosalicylic Acid

The diorganotin derivatives of 3,5-dinitrosalicylic acid, R2SnL (L = 3,5-(NO2)2–2-OC6H2COO, R = C2H5 1; n-C4H9 2; c-C6H11 3) have been synthesized and characterized by elemental analysis, IR, and NMR spectra. The crystal structure of (n-C4H9)2SnL(CH3OH) has been determined. This compound is a novel one-dimensional ladder-shaped supramolecular polymer formed by bridged coordination of carboxyl group to tin and intermolecular hydrogen bond, and tin atom possesses a distorted octahedral geometry. The in vitro cytotoxicities of 2 and 3 against two human tumor cells, A549 and CoLo205, are higher than those of cis-platin, and the activity decreased in the order 3 >2 >1.

Synthesis, Characterization, and in vitro Cytotoxicity of Organotin Derivatives of 4-Biphenylcarboxylic Acid

The di- and tri-organotin derivatives of 4-biphenylcarboxylic acid, {[(CH3CH2CH2CH2)2Sn(OCOC6H4C6H5)]2O}2 (1) and R3SnOCOC6H4C6H5 (R = C6H5, 2; c-C6H11, 3; C6H5C(CH3)2CH2, 4), have been synthesized and characterized by elemental analysis, IR, 1H, and 13C NMR spectroscopies. The crystal structures of 1 and 2 have been determined. Compound 1 is a centrosymmetric dimmer with two distinct types of carboxylate moieties and tin atoms with distorted trigonal bipyramidal geometries and 2 possesses a distorted tetrahedral structure. The in vitro cytotoxicity of 4 against three human tumor cell lines was found to be higher than that for cis-platin used clinically.

Bis(5-bromo-N-cyclo­hexyl­salicyl­idene­aminato)­nickel(II): an orthorhombic polymorph

The title compound, [Ni(C13H15BrNO)2], crystallizes in the orthorhombic space group Pbca, rather than the previously reported monoclinic space group C2/c [Sun & Ng (2005). Acta Cryst. E61, m323–m324]. The NiII atom is coordinated by two N atoms and two O atoms from two Schiff bases, forming a distorted tetrahedral geometry.

Bis[4-bromo-2-(pyridin-2-ylmethyl­imino­methyl)phenolato-κ3N,N′,O]cobalt(III) nitrate

The title compound, [Co(C13H10BrN2O)2]NO3, is a mononuclear cobalt(III) complex. The CoIII atom is coordinated by four N atoms and two O atoms of two Schiff base ligands, forming a slightly distorted octahedral coordination configuration.

[N,N′-Bis(2-oxido-1-naphthyl­methyl­ene)propane-1,3-di­amine]copper(II)

The title compound, [Cu(C25H20N2O2)], is a centrosymmetric mononuclear copper(II) complex. The CuII atom and central C atom of the propane linkage lie on a mirror plane. The CuII ion is coordinated by two N atoms and two O atoms from a bis-Schiff base ligand in a slightly distorted square-planar geometry.

2,5-Bis[(3-hy­droxy­prop­yl)amino]-1,4-benzoquinone monohydrate

The title compound, C12H18N2O4·H2O, was obtained as a product of the reaction of hydroquinone with n-propanol amine. The compound crystallizes as a monohydrate, integrating water into its hydrogen-bonded network. Each diaminoquinone moiety forms two centrosymmetric 10-membered rings through C=O⋯H—N bonds. The resulting bands along [102] are interlinked through hydroxy groups and water molecules into three-dimensional network. The chemically equivalent bond lengths in the diaminoquinone moiety exhibit a perceptible discrepancy [e.g. C=O bond lengths differ by 0.016 (2) Å], apparently as a result of asymmetric hydrogen bonding: one O atom serves as an acceptor of one hydrogen bond, whereas the other is an acceptor of two.

Bis(N,N-dimethylethane-1,2-diamine)dithiocyanatocobalt(III) perchlorate: a redetermination

The crystal structure of the title compound, [Co(NCS)2(C4H12N2)2]ClO4, has been reported previously by Eminger, Fallab, Zehnder & Dobler [Helv. Chim. Acta (1992), 75, 1245–1250], with an R value of 0.074. However, no coordinates are available. We present here a redetermination of this structure using new intensity data. The CoIII atom, lying on an inversion centre, is six-coordinate in an octahedral geometry. The perchlorate anion, located on a twofold axis, is disordered over two orientations.

Bromo(N,N-dimethyldithiocarbamato-κ2 S,S′)diphenyltin(IV)

The Sn atom in the title compound, [SnBr(C6H5)2(C3H6NS2)], adopts a distorted SnBrC2S2 trigonal–bipyramidal environment.