41 research outputs found
Tricarbonylchlorido(η5-cyclopentadienyl)molybdenum(II)
The structure of the title compound, [Mo(C5H5)Cl(CO)3], reveals a pseudo-square-pyramidal piano-stool coordination around the MoII ion, which is surrounded by a cyclopentadienyl ring, three carbonyl groups and a chloride ligand
New imino-pyridyl nickel (II) complexes: synthesis, molecular structures and application as Heck coupling catalysts
Reactions of imino-pyridyl ligands, (2-pyridyl-2-thiophenemethyl)imine (L1) and (2-pyridyl-2-thiopheneethyl)imine (L2) with NiBr2(DME) gave the corresponding complexes [Ni(L1)Br2] (1) and [Ni(L2)Br2] (2) in good yields. Treatment of 1 and 2 with one equivalent of 2-hydroxythiophenol resulted in the displacement of the bromide ligands to form the nickel(II) thiolato complexes 3 and 4. Molecular structure of 3 confirmed that L1 and L2 bind to the nickel atom in a bidentate fashion. Complexes 1-4 catalyzed the Heck coupling reaction of iodobenzene and bromobenzene with methyl acrylate.Web of Scienc
Bromido-1κBr-tricarbonyl-2κ3 C-(2η5-cyclopentadienyl)molybdenum(I)tungsten(I)(W—Mo)
The title compound, [WMoBr(C5H5)(CO)3], is built up from a pseudo-square-pyramidal piano-stool coordination around the Mo atom, the important geometry being Mo—W = 2.6872 (7) Å, W—Br = 2.5591 (9) Å and Mo—W—Br = 158.35 (3)°
Crystal structure of 2,2′-(propane- 1,3-dilylbis(azaneylylidene))bis(methanylylidene) bis(4-methylphenol), C19H22N2O2
C19H22N2O2, monoclinic, P21/c (no. 14), a = 19.3063(4) Å, b = 5.83200(10) Å, c = 14.7996(3) Å, β = 92.715(1)°, V = 1664.48(6) Å3, Z= 4, Rgt(F) = 0.0423, wRref (F2) = 0.1102, T = 100(2) K
Chlorido[2-({[2-(diphenylphosphanyl)benzylidene]amino}methyl)thiophene-κ2 N,P]methylpalladium(II)
In the title compound, [Pd(CH3)Cl(C24H20NPS)], the PdII ion is coordinated in a distorted square-planar environment which includes the P and N atoms of the bis-chelating ligand. The thiophene ring is rotationally ordered, unlike in the majority of crystal structures containing this group
Dichlorido-[2-(2,6-diethylphenyl)iminomethylquinoline-N,N’]palladium(II) acetonitrile monosolvate
The title complex, [PdCl2(C20H20N2)] CH3CN, was synthesized
by the reaction of 2-[(2,6-diethylphenyl)iminomethyl]quinoline
with dichlorido(cycloocta-1,5-diene)palladium(II) in dry
CH2Cl2. The PdII ion is coordinated by two N atoms of the
bidentate quinoline ligand and by two chloride anions,
generating a distorted square-planar coordination geometry
around the metal centre. There is a detectable trans influence
for the chloride ligands. The crystal packing is characterized
by – stacking between the quinoline rings. The use of
acetonitrile as the crystallization solvent was essential for
obtaining good-quality crystals.Web of Scienc
Dichlorido[2-(phenyliminomethyl)quinoline-N,N′]palladium(II)
In the title complex, [PdCl2(C16H12N2)], the PdII ion is coordinated by two N atoms [Pd—N 2.039 (2), 2.073 (2) Å] from a bidentate ligand and two chloride anions [Pd—Cl 2.2655 (7), 2.2991 (7) Å] in a distorted square-planar geometry. In the crystal, π–π interactions between the six-membered rings of the quinoline fragments [centroid–centroid distances = 3.815 (5), 3.824 (5) Å] link two molecules into centrosymmetric dimers
Antimicrobial activities of a novel biflavonoid and other constituents from Rhus natalensis
Phytochemical studies on Rhus natalensis root bark collected from Kenya led to the isolation and
identification of a new biflavonoid (3-(1-(2,4-dihydroxyphenyl)-3,3-bis(4-hydroxyphenyl)-1-oxopropan-2-
yl)-7-methoxy-4H-chromone-4-one (1), named rhuschromone, in addition to two other known
compounds; 2',4'-dihydroxychalcone-(4-O-5''')-4'',2''',4'''-trihydroxychalcone (2) and 3-((Z)-heptadec-13-
enyl) benzene-1,2-diol (3). The chemical structures of the isolated compounds were established using
spectroscopic techniques including high field nuclear magnetic resonance (NMR). The total extracts
and the isolated compounds were tested for their antimicrobial activities against different strains of
bacteria
Chlorido{N-[2-(diphenylphosphanyl)- benzylidene]-2-(2-thienyl)ethanamine-ĸ²N,P}methylpalladium(II) dichloromethane hemisolvate
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Imino-quinolyl palladium(II) and platinum(II) complexes: synthesis, characterization, molecular structures and cytotoxic effect
Imino-quinolyl ligands L1-L5 were synthesized by condensation reactions and obtained in good yields. Reactions of the ligands with either PdCl2(cod) or K2[PtCl4] gave the corresponding palladium(II) and platinum(II) complexes 1-10 also in good yields. All the compounds were characterized by elemental analysis, IR, 1H and 13C NMR spectroscopy. X-ray crystallography was used to confirm the structures of these compounds. Molecular structures of 3 and 5 showed that the ligands coordinate to the metal centre through the two nitrogen atoms, generating a distorted square planar geometry around the palladium atom. The new complexes exhibited remarkable cytotoxic activities against MCF-7 and HT-29 cancer cell lines.Web of Scienc