Penta­carbon­yl{3-[(2S)-1-methyl­pyrrolidin-2-yl]pyridine}tungsten(0)

The title compound, [W(C10H14N2)(CO)5], contains five carbonyl ligands and a nicotine ligand in an octa­hedral arrangement around the tungsten atom. The metal atom shows cis angles in the range 87.30 (16)–94.2 (2)°, and trans angles between 175.2 (2) and 178.1 (4)°. The W—CO bond trans to the pyridine N atom [1.987 (6) Å] is noticeably shorter than the others, which range between 2.036 (3) and 2.064 (3) Å, possibly due to the well-known trans effect. The distance between the W atom and the pyridine N atom is 2.278 (4) Å

Synthesis, characterization and antibacterial activity studies of new 2‑pyrral‑L‑amino acid Schif base palladium (II) complexes.

Three new 2-pyrral amino acid Schif base palladium (II) complexes were synthesized, characterized and their activity against six bacterial species was investigated. The ligands: Potassium 2-pyrrolidine-L-methioninate (L1), Potassium 2-pyrrolidine-L-histidinate (L2) and Potassium 2-pyrrolidine-L-tryptophanate (L3) were synthesized and reacted with dichloro(1,5- cyclooctadiene)palladium(II) to form new palladium (II) complexes C1, C2 and C3, respectively. 1 NMR, FTIR, UV–Vis,elemental analysis and conductivity measurements were used to characterize the products. The antibacterial activities of the compounds were evaluated against Gram-positive Staphylococcus aureus (S. aureus, ATCC 25923), methicillin-resistant Staphylococcus aureus (MRSA, ATCC 33591), Staphylococcus epidermidis (S. epidermidis, ATCC 12228) and Streptococcus pyogenes (S. pyogenes, ATCC 19615) and, gram-negative Pseudomonas aeruginosa (P. aeruginosa, ATCC 27853) and Klebsiella pneumoniae (K. pneumoniae, ATCC 13883) using the agar well difusion assay and microtitre plate serial dilution method. The palladium complexes were active against the selected bacteria with the imidazole ring containing complex C2 and indole heterocyclic ring containing complex C3 showing the highest activity

Synthesis and Characterization of New (η⁵‑Cyclopentadienyl)dicarbonylruthenium(II) Amine Complexes: Their Application as Homogeneous Catalysts in Styrene Oxidation

The water-soluble ruthenium­(II) mononuclear complexes [CpRu­(CO)₂NH₂R]­BF₄ (Cp = η⁵-C₅H₅; R = C₆H₁₁ (<b>1</b>), C₆H₅ (<b>2</b>), CH₂C₆H₅ (<b>3</b>), CH­(CH₃)­C₆H₅ (<b>4</b>), CH₂(C₆H₄O)­CH₃ (<b>5</b>), CH₂(C₆H₄)­CN (<b>6</b>), C₆H₂(CH₃)₃ (<b>7</b>), CH₂CHCH₂ (<b>8</b>), CH­(CH₃)₂ (<b>9</b>)) were synthesized from the reaction of the organometallic Lewis acid [CpRu­(CO)₂]­BF₄ with amine ligands at room temperature. These complexes are reported for the first time and have been fully characterized by IR, high-resolution mass spectrometry, ¹H and ¹³C NMR spectroscopy, and elemental analysis. Spectral data show that the amines are σ-bonded to the metal center via the nitrogen atom. The crystal structures of complexes <b>3</b> and <b>8</b> were determined by single-crystal X-ray crystallography. The 4-methoxybenzylamine, 4-aminomethylbenzonitrile and allylamine groups preferentially bind to the metal center via the amine nitrogen. The ruthenium complexes <b>1</b>, <b>3</b>–<b>6</b>, <b>9</b>, and [CpRu­(CO)₂NH₂CH₃]­BF₄ (<b>10</b>) and the dinuclear complex [CpRu­(CO)₂NH₂(CH₂)₆NH₂(CO)_2‑RuCp]­[BF₄]₂ (<b>11</b>) demonstrated excellent catalytic activity in the oxidation of styrene using NaIO₄ as the co-oxidant with over 95% conversion and benzaldehyde yields, respectively, in some cases