Pentacarbonyl(2,6-diaminopyridine)chromium(0): synthesis and molecular structure

Date

2004-7

Author

Morkan, Izzet Amour
Güven, Kutalmış
Özkar, Saim

Metadata

Show full item record

Item Usage Stats

354
views

0
downloads

Photolysis of hexacarbonylchromium(0) in the presence of 2,6-diaminopyridine in toluene solution at 10 degreesC yields pentacarbonyl(2,6-diaminopyridine)chromium(0), which could be isolated from solution as plate-like crystals and fully characterized by using the single crystal X-ray diffractometry and MS, IR, H-1 and C-13 NMR spectroscopy. The complex was found to have the 2,6-diaminopyridine ligand bonded to the chromium atom through one of the NH2 groups. A single crystal X-ray structure of the complex reveals that the coordination sphere around the chromium atom is a slightly distorted octahedron, involving five carbonyls and one 2,6-diaminopyridine ligand. Because of the steric requirement of 2,6-diaminopyridine the four equatorial carbonyl groups are bended away from the N-donor ligand. The pyridine plane makes an angle of 112.9(3)degrees with the OC-Cr-N bond axis. The Cr-C distances have values between 1.833(7) and 1.935(7) Angstrom. The Cr-N distance is 2.236(5) Angstrom.

Subject Keywords

Chromium, Carbonyl, Diaminopyridine, Molecular structure, XRD, Synthesis, Photolysis, Spectroscopic techniques, X-ray diffraction

URI

https://hdl.handle.net/11511/28428

Journal

Journal of Organometallic Chemistry

DOI

https://doi.org/10.1016/j.jorganchem.2004.04.020

Collections

Department of Chemistry, Article

Suggestions

OpenMETU
Core

Pentacarbonyl(eta(2)-vinylferrocene)metal(0) complexes of Group 6 elements: synthesis and characterization Özkar, Saim; Demir, N (Elsevier BV, 2003-12-15) Photolysis of hexacarbonylmetal(0) complexes of the Group 6 elements in the presence of vinylferrocene in an n-hexane solution at -15 degreesC yields pentacarbonyl (eta(2)-vinylferrocene)metal(0) complexes as the sole photo-substitution product, different from the general reaction pattern observed for the same Group 6 metal carbonyls with other olefins. M(CO)(5)(eta(2)-vinylferrocene) complexes (M = Cr, Mo, W) could be isolated from the solution and characterized by using spectroscopic techniques. The compl...
PENTACARBONYL(1,4-DIISOPROPYL-1,4-DIAZABUTADIENE)CHROMIUM - ISOLATION AND REACTIVITY OF THE MONODENTATE INTERMEDIATE EN-ROUTE TO CR(CO)4(IPROP-DAB) CHELATE RING-CLOSURE GREVELS, FW; KAYRAN, C; Özkar, Saim (1994-08-01) Exchange of the olefin ligand in Cr(CO)5(eta2-(Z)-cyclooctene) by 1,4-diisopropyl-1,4-diazabutadiene (iprop-DAB) yields Cr(CO)5(iprop-DAB) (1), where the potentially bidentate DAB ligand coordinates in a monodentate fashion. Complex 1 is isolated as red crystals and fully characterized (elemental analysis, IR, UV-vis, H-1 NMR and C-13 NMR spectra). In hydrocarbon solution at ambient temperature it decays via two competitive routes involving (a) chelate ring closure with CO extrusion to form Cr(CO)4(iprop-DA...
lntrazeolite Metal Carbonyl Kinetics: 12CO Substitution in Mo(12C0)6-Na56Y by PMe3 and 13CO OZIN, GA; Özkar, Saim; PASTORE, HO; POE, AJ; VICHI, EJS (Royal Society of Chemistry (RSC), 1991-02-01) The first kinetic study is reported for archetypical substitution reactions of PMe3 and 13CO with the well defined intrazeolite system, Mo(12CO)6-Na56Y, for which excellent isosbestic points and first order behaviour are obtained, the activation parameters indicate a highly ordered 'supramolecular' transition state consisting of activated Mo(12CO)6 and PMe3 or 13CO all anchored to the Na+ ions in the alpha-cage of the host lattice.
Synthesis and Characterization of [Ir(1,5-Cyclooctadiene)(mu-H)](4): A Tetrametallic Ir4H4-Core, Coordinatively Unsaturated Cluster Yih, Kuang-Hway; Hamdemir, Isil K.; Mondloch, Joseph E.; Bayram, Ercan; Özkar, Saim; Vasic, Relja; Frenkel, Anatoly I.; Anderson, Oren P.; Finke, Richard G. (2012-03-05) Reported herein is the synthesis of the previously unknown [Ir(1,5-COD)(mu-H)](4) (where 1,5-COD = 1,5-cyclooctadiene), from commercially available [Ir(1,5-COD)Cl](2) and LiBEt3H in the presence of excess 1,5-COD in 78% initial, and 55% recrystallized, yield plus its unequivocal characterization via single-crystal X-ray diffraction (XRD), X-ray absorption fine structure (XAFS) spectroscopy, electrospray/atmospheric pressure chemical ionization mass spectrometry (ESI-MS), and UV-vis, IR, and nuclear magnetic...
HEXACHLOROCYCLOPENTADIENE IN DIELS-ALDER ASYMMETRIC REACTION AKHMEDOV, IM; PEYNIRCIOGLU, B; MAMEDOV, EG; Tanyeli, Cihangir; DEMIR, AS (1994-02-14) Asymmetric thermal Diels-Alder reactions with chiral dienophiles l-menthyl acrylate and l-menthyl allyl ether, using hexachlorocyclopentadiene (HCC) gave cycloadducts of up to 15%ee. Milder reaction conditions achieved by the use of Lewis acid catalysis increased the optical yields up to 2.8 fold. The catalyzed and uncatalyzed reactions using l-menthyl acrylate result in the formation of adducts having opposite configurations. The products have also been resolved via diastereomer formation as pure enantiomers.

Citation Formats

I. A. Morkan, K. Güven, and S. Özkar, “Pentacarbonyl(2,6-diaminopyridine)chromium(0): synthesis and molecular structure,” Journal of Organometallic Chemistry, pp. 2319–2323, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/28428.