Methane and methyl halide activation by Sc atoms: Infrared spectra and DFT calculations for the CH3–ScX and CH2–ScHX complexes
作者:Han-Gook Cho、Lester Andrews
DOI:10.1016/j.ica.2007.05.052
日期:2008.1
atoms with methane and methyl halides have been done during condensation in excess argon, and matrix infraredspectra were recorded for the products. Scandium is as effective as titanium in producing insertion products (CH 3 –ScX, X = H, F, Cl, Br) and higher oxidation-state methylidene complexes (CH 2 –ScHX) following α-hydrogen migration. However, unlike the Group 4–6 metal complexes, the Group 3
Methylidyne Complexes Prepared by Reactions of Laser-Ablated Os Atoms with Methane, Methyl Halides, and Ethane: Observation of the C—H and Os—H Stretching Absorptions
作者:Han-Gook Cho、Lester Andrews
DOI:10.1021/om701041u
日期:2008.4.1
Simple Os carbyne complexes (HC≡OsH3, HC≡OsH2F, HC≡OsH2Cl, HC≡OsH2Br, and CH3C≡OsH3) are produced in reactions of laser-ablated Os atoms with small alkanes and methylhalides via oxidative C−H insertion and α-hydrogen migration. The diagnostic methylidyne C—H stretching absorptions of HC≡OsH3 and its halide derivatives are observed about 200 cm−1 above the precursor C—H stretching bands, and the frequencies
Infrared Spectra of Platinum Insertion and Methylidene Complexes Prepared in Oxidative C−H(X) Reactions of Laser-Ablated Pt Atoms with Methane, Ethane, and Halomethanes
作者:Han-Gook Cho、Lester Andrews
DOI:10.1021/om801077x
日期:2009.3.9
the similar Pt−H and Pt−F bond energies. The formation of small Pt carbenes also reveals that high oxidation-state complexes are favored in reactions with di- and trihalomethanes as well as in previously studied reactions of Pt and tetrahalomethanes. Calculations show that endothermic HF elimination from CHF═PtHF can produce the HC≡PtF molecule, which contains a platinum−carbon triple bond.
Infrared Spectra of CX<sub>3</sub>−MnX and CX<sub>2</sub>═MnX<sub>2</sub>(X = H, F, Cl) Prepared in Reactions of Laser-Ablated Manganese Atoms with Halomethanes
作者:Han-Gook Cho、Lester Andrews
DOI:10.1021/om100791h
日期:2011.2.14
calculations. The Mn methylidenes have planar structures, common among early transition-metal analogues, revealing that Mn has borderline properties between the early and late transitionmetals. The computed C−Mn bond lengths of the carbene complexes in the quartet states (1.855−1.872 Å) are considerably shorter than those of the insertion complexes in the sextet states (2.057−2.120 Å), which is likely due to
Infrared Spectra of Methylidynes Formed in Reactions of Re Atoms with Methane, Methyl Halides, Methylene Halides, and Ethane: Methylidyne C−H Stretching Absorptions, Bond Lengths, and s Character
作者:Han-Gook Cho、Lester Andrews
DOI:10.1021/ic701505w
日期:2008.3.1
carbyne complexes (HC identical with ReH 3, HC identical with ReH 2X, HC identical with ReHX 2, [X = F, Cl, and Br] and CH 3C identical with ReH 3) are produced by reactions of laser-ablated Re atoms with methane, methylhalides, methylene halides, and ethane via oxidative C-H(X) insertion and alpha-hydrogen migration in favor of the carbon-metal triple bond. The stabilities of the carbyne complexes relative