Tetrakis(pyridine)tetrachloro(. mu. -chloro)(. mu. -hydrido)ditungsten (W-W) and its 4-ethylpyridine homologue. Compounds derived from a quadruply bonded dimer by ligand exchange and oxidative addition of hydrogen chloride
- Iowa State Univ., Ames (USA)
Reaction of W{sub 2}(mhp){sub 4} (mhp = anion of 6-methyl-2-hydroxypyridine) with (CH{sub 3}){sub 3}SiCl and pyridine in the presence of methanol provides the light brown compound W{sub 2}HCl{sub 5}(NC{sub 5}H{sub 5}){sub 4}. The 4-ethylpyridine adduct W{sub 2}HCl{sub 5}(NC{sub 5}H{sub 4}C{sub 2}H{sub 5}){sub 4} is obtained by ligand exchange at 100{degree}C. Brown crystals of the latter are monoclinic, space group C2/c, with a = 11.883 (3) {angstrom}, b = 13.213 (3) {angstrom}, c = 21.727 (4) {angstrom}, {beta} = 96.39 (3){degree}, and Z = 4. Structure refinement revealed an edge-shared bioctahedral arrangement with one H atom and one Cl atom in bridging positions between the metal atoms. The Cl atoms all occupy positions in the equatorial plane, and the 4-ethylpyridine ligands occupy the axial positions of the dimer. The short W-W distance, 2.516 (2) {angstrom}, is consistent with a W-W multiple bond. Comparison of the infrared spectra of the hydride and deuteride derivatives confirms the presence of a bridging H atom and indicates an isostructural arrangement for the pyridine and 4-ethylpyridine derivatives, as do electronic reflectance spectra. 33 refs., 4 figs., 4 tabs.
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5052959
- Journal Information:
- Inorganic Chemistry; (USA), Vol. 28:13; ISSN 0020-1669
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CHLORINE COMPOUNDS
CHEMICAL PREPARATION
HYDROXY COMPOUNDS
PYRIDINE
TUNGSTEN COMPLEXES
CRYSTAL STRUCTURE
EXPERIMENTAL DATA
AZINES
COMPLEXES
DATA
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
400201* - Chemical & Physicochemical Properties