Vibrational spectra and structure of {open_quotes}staircase{close_quotes} carbonyl {pi}-complexes of transition metals 2. Rotational isomerism

Journal Article · Mon May 01 00:00:00 EDT 1995 · Russian Chemical Bulletin

OSTI ID:75661

Ezernitskaya, M G; Lokshin, B V; Orlova, T Yu; Setkina, V N; Shilnikov, V I ^[1]; Cesaro, S N ^[2]

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1. A.N. Nesmeyanov Institute of Organoelement Compounds, Moscow (Russian Federation)
2. Institute of High Temperature Thermodynamics, Rome (Italy)

FTIR spectra have been studied for {open_quotes}staircase{close_quotes} cyclopentadienyl complexes containing two or three metal carbonyl fragments bound by the metal-carbon bond Cp(CO){sub 2}Fe-CpmMn(CO){sub 3} (1), Cp(CO){sub 2}Fe-CpmFe(CO){sub 2}CH{sub 2}Ph, Cp(CO){sub 2}Fe-Cpm(CO){sub 2}Fe-CpmMn(CO){sub 3}, Cp(CO){sub 2}Mo-Cpm(CO){sub 2}Fe-CpmMn(CO){sub 3}, Cp(CO){sub 3}W-Cpm(CO){sub 2}Fe-CpmMn(CO){sub 3}, Cp(CO){sub 2}Fe-Cpm(CO){sub 2}Fe-BmCr(CO){sub 3}, Cr(CO){sub 3}Bm-CpmFe(CO){sub 2}CH{sub 2}Ph, where Cp = {eta}{sup 5}-C{sub 5}H{sub 5}, Cpm = {eta}{sup 1}:{eta}{sup 5}-C{sub 5}H{sub 4}, Bm = {eta}{sup 1}:{eta}{sup 6}-C{sub 6}H{sub 5}. Temperature-dependent FTIR spectra were measured in n-pentane solutions over a wide temperature range and in the low-temperature solid matrices of argon and nitrogen. Rotamers, formed due to rotation about the metal-carbon {sigma}-bond, were found in solutions and matrices. A molecular mechanics calculation of 1 proved the possibility of such rotation.

• OSTI ID: 75661
• Journal Information: Russian Chemical Bulletin, Vol. 43, Issue 11; Other Information: PBD: May 1995; TN: Translated from Izvestiya Akademii Nauk. Seriya Khimicheskaya; No. 11, 1952-1956(Nov 1994)
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
IRON COMPLEXES
VIBRATIONAL STATES
MANGANESE COMPLEXES
ORGANOMETALLIC COMPOUNDS
TUNGSTEN COMPLEXES
CHROMIUM COMPLEXES
MOLYBDENUM COMPLEXES
CARBONYLS
MOLECULAR STRUCTURE
ELECTRONIC STRUCTURE
ABSORPTION SPECTROSCOPY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
MATHEMATICAL MODELS