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Synthesis and Structure of a Tungsten Dimer with a W-W Bond Order of 3.5

Timothy R. Ryan ; Ames Laboratory, U.S.D.O.E. and Department of Chemistry, Iowa State University, Ames. Iowa 50011, U.S.A.
Robert E. McCarley ; Ames Laboratory, U.S.D.O.E. and Department of Chemistry, Iowa State University, Ames. Iowa 50011, U.S.A.

Puni tekst: engleski, pdf (27 MB) str. 769-780 preuzimanja: 213* citiraj
APA 6th Edition
Ryan, T.R. i McCarley, R.E. (1995). Synthesis and Structure of a Tungsten Dimer with a W-W Bond Order of 3.5. Croatica Chemica Acta, 68 (4), 769-780. Preuzeto s https://hrcak.srce.hr/136692
MLA 8th Edition
Ryan, Timothy R. i Robert E. McCarley. "Synthesis and Structure of a Tungsten Dimer with a W-W Bond Order of 3.5." Croatica Chemica Acta, vol. 68, br. 4, 1995, str. 769-780. https://hrcak.srce.hr/136692. Citirano 08.03.2021.
Chicago 17th Edition
Ryan, Timothy R. i Robert E. McCarley. "Synthesis and Structure of a Tungsten Dimer with a W-W Bond Order of 3.5." Croatica Chemica Acta 68, br. 4 (1995): 769-780. https://hrcak.srce.hr/136692
Harvard
Ryan, T.R., i McCarley, R.E. (1995). 'Synthesis and Structure of a Tungsten Dimer with a W-W Bond Order of 3.5', Croatica Chemica Acta, 68(4), str. 769-780. Preuzeto s: https://hrcak.srce.hr/136692 (Datum pristupa: 08.03.2021.)
Vancouver
Ryan TR, McCarley RE. Synthesis and Structure of a Tungsten Dimer with a W-W Bond Order of 3.5. Croatica Chemica Acta [Internet]. 1995 [pristupljeno 08.03.2021.];68(4):769-780. Dostupno na: https://hrcak.srce.hr/136692
IEEE
T.R. Ryan i R.E. McCarley, "Synthesis and Structure of a Tungsten Dimer with a W-W Bond Order of 3.5", Croatica Chemica Acta, vol.68, br. 4, str. 769-780, 1995. [Online]. Dostupno na: https://hrcak.srce.hr/136692. [Citirano: 08.03.2021.]

Sažetak
Reaction of W2(mhp)4, where mhp is the anion of 2-hydroxy-6- methylpyridine, with AICI3 in refluxing diglyme provides the new paramagnetic compound W2Cl2(mhp)3 • CH2CI2 in 67 percent yield after recrystallization from dichloromethane. The source of the oxidant for oxidation of tungsten from W(2.0) to W(2.5) was not identified. Orange-brown crystals of the new compound belong to the noncentric orthorhombic space group P2I2424 with a = 13.150(6), b = 21.24(1) and c = 8.738(4) Å, Z = 4. Refinement of the structure provided R(RW) = 0.058(0.080) and a W-W bond distance of 2.214(2) Å, 0.053 Å longer than that in W2(mhp)4 • CH2CI2. The W-W bond has a bond order of 3.5 corresponding to the bonding orbital population a27i481. Strong bands arising from W-Cl stretching modes occur at 321 and 289 cm-1 in the IR spectra, and a weak band at 782 nm (e ~ 600 M_1cm_1) in the UV-visible spectrum may correspond to the 8 —> 8 electronic transition. The EPR spectrum shows a strong, nearly symmetric, absorption with g = 1.842. Cyclic voltammetry in dichloromethane reveals a quasi-reversible reduction at Ey2 = —0.7 V vs. SSCE and an irreversible oxidation at +0.3 V.

Hrčak ID: 136692

URI
https://hrcak.srce.hr/136692

Posjeta: 317 *