112 research outputs found
Bis(acetonitrile-κN)diaquabis(perchlorato-κO)copper(II)
In the title compound, [Cu(ClO4)2(CH3CN)2(H2O)2], the Cu2+ ion, located on a special position (site symmetry ), is coordinated by six monodentate ligands, viz. an N-coordinated acetonitrile, a perchlorate anion and a water molecule, and their symmetry-related counterparts. The perchlorate anion is disordered over two sets of sites with occupancies of 0.53 (2) and 0.47 (2). The crystal structure is stabilized by O—H⋯O hydrogen bonds involving the perchlorate ion and aqua H atoms
High-pressure synthesis of rock salt LiMeO2-ZnO (Me = Fe3+, Ti3+) solid solutions
Metastable LiMeO2-ZnO (Me = Fe3+, Ti3+) solid solutions with rock salt
crystal structure have been synthesized by solid state reaction of ZnO with
LiMeO2 complex oxides at 7.7 GPa and 1350-1450 K. Structure, phase composition,
thermal stability and thermal expansion of the recovered samples have been
studied by X-ray diffraction with synchrotron radiation. At ambient pressure
rock salt LiMeO2-ZnO solid solutions are kinetically stable up to 670-800 K
depending on the composition.Comment: 11 pages, 3 figures, 1 tabl
8-Hydroxy-8-phenyl-2,3,7,8-tetrahydro-6H-1,4-dioxino[2,3-f]isoindol-6-one
In the title compound, C16H13NO4, the indole system is essentially planar, whereas the dioxane ring adopts a twist conformation. The molecules are linked into chains by —O— H⋯O=C— hydrogen bonds and these chains are linked into rods by means of N—H⋯O hydrogen bonds. Exept for weak C—H⋯O interactions between the rods, no other intermolecular contacts of interest are present
(1R,2R,3R,4S,5S)-3-Methyl-8-oxabicyclo[3.2.1]oct-6-ene-2,4-diyl diacetate
The molecule of the title compound, C12H16O5, has crystallographically imposed mirror symmetry with the mirror plane passing through the endocyclic O atom and the mid-point of the double bond. In the crystal, molecules are linked by C—H⋯O hydrogen bonds, forming chains running along the a axis
rac-12,14-Dicyclopropyl-5,8,13,18,21-pentaoxapentacyclo[13.8.0.02,11.04,9.017,22]tricosa-1(15),2(11),3,9(10),16,22(23)-hexaene
The molecule of the title compound, C24H24O5, has crystallographic twofold symmetry, with the central O atom lying on the rotation axis. The dihedral angle between the best planes of the benzene rings fused to the oxepine fragment is 38.5 (1)°. The dioxine ring adopts a twist form with the ethylene group C atoms deviating by 0.472 (5) and −0.248 (6) Å from the plane defined by the remaining ring atoms
3-exo-Chloro-8-oxabicyclo[3.2.1]oct-6-ene-2,4-diol chloroform 0.33-solvate
The title compound, 3C7H9ClO3·CHCl3, crystallizes with molecules of 3-exo-chloro-8-oxabicyclo[3.2.1]oct-6-ene-2,4-diol (A) and chloroform in a 3:1 ratio, in the space group R3m. Molecules of A straddle a crystallographic mirror plane, whereas the chloroform molecules (C and H atoms) lie additionally on the threefold axis. The molecules of A are linked into right- and left-helical chains by means of O—H⋯O hydrogen bonds, thus forming columns running along the c axis. Six interpenetrated columns form a channel in which the solvent molecules (chloroform) are located
Methyl 2-(2,2,4-trimethyl-6-tosylperhydro-1,3-dioxino[5,4-c]pyridin-5-yl)acetate
The title compound, C20H29NO6S, crystallizes with two molecules in the asymmetric unit, with similar conformations. The dioxane and pyridine rings adopt twist conformations in both molecules. The packing is stabilized by intermolecular C—H⋯O hydrogen bonds
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Aryl oligogermanes as ligands for transition metal complexes
The ligand properties of a series of aryl oligogermanes R3Ge‐GeAr3, 3‐7 (Me3Ge‐GePh3 (3), Me3Ge‐Ge(pTol)3 (4), Ph3Ge‐GePh3 (5), (C6F5)3Ge‐GePh3 (6), Ph3Ge‐GeMe2GePh3 (7)), for the synthesis of transition metal carbonyl complexes such as R3Ge‐GeAr2(R’C6H4‐η6)M(CO)3 (M = Cr, 3a‐7a; M = Mo, 3b; M = W, 3c) were investigated. The target complexes were obtained in moderate yields using several different synthetic approaches. The physicochemical properties of these new derivatives were investigated by IR, UV/vis, NMR spectroscopy, electrochemistry and DFT calculations. The molecular structures of 3c, 4a and 5a were studied by single crystal X‐ray diffraction analysis. A comparative analysis of donor‐ and acceptor properties of aryl oligogermanes as ligands for transition metal carbonyl complexes is reported
Antioxidative vs cytotoxic activities of organotin complexes bearing 2,6-di-tert-butylphenol moieties
Copyright © 2018 John Wiley & Sons, Ltd. Two series of organotin(IV) complexes with Sn–S bonds on the base of 2,6-di-tert-butyl-4-mercaptophenol (L1SH) of formulae Me2Sn(L1S)2 (1); Et2Sn(L1S)2 (2); Bu2Sn(L1S)2 (3); Ph2Sn(L1S)2 (4); (L1)2Sn(L1S)2 (5); Me3Sn(L1S) (6); Ph3Sn(L1S) (7) (L1 = 3,5-di-tert-butyl-4-hydroxyphenyl), together with the new ones [Me3SnCl(L2)] (8), [Me2SnCl2(L2)2] (9) (L2 = 2-(N-3′,5′-di-tert-butyl-4′-hydroxyphenyl)-iminomethylphenol) were used to study their antioxidant and cytotoxic activity. Novel complexes 8, 9 of MenSnCl4 − n (n = 3, 2) with Schiff base were synthesized and characterized by 1H, 13C NMR, IR and elemental analysis. The crystal structures of compounds 8 and 9 were determined by X-ray diffraction analysis. The distorted tetrahedral geometry around the Sn center in the monocrystals of 8 was revealed, the Schiff base is coordinated to the tin(IV) atom by electrostatic interaction and formation of short contact Sn–O 2.805 Å. In the case of complex 9 the distorted octahedron coordination of Sn atom is formed. The antioxidant activity of compounds as radical scavengers and reducing agents was proved spectrophotometrically in tests with stable radical DPPH, reduction of Cu2+ (CUPRAC method) and interaction with superoxide radical-anion. Moreover, compounds have been screened for in vitro cytotoxicity on eight human cancer cell lines. A high activity against all cell lines with IC50 values 60–160 nM was determined for the triphenyltin complex 7, while the introduction of Schiff base decreased the cytotoxicity of the complexes. The influence on mitochondrial potential and mitochondrial permeability for the compounds 8 and 9 has been studied. It is shown that studied complexes depolarize the mitochondria but don't influence the calcium-induced mitochondrial permeability transition
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