Kinetic and thermodynamic acidity of hydrido transition-metal complexes. 3. Thermodynamic acidity of common mononuclear carbonyl hydrides

Journal Article · Wed Apr 30 04:00:00 EDT 1986 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00269a022· OSTI ID:5659050

Moore, E J; Sullivan, J M; Norton, J R

The pK/sub a/ values of the common mononuclear carbonyl hydrides have been determined in acetonitrile by IR measurement of the position of deprotonation equilibria with various nitrogen bases and potassium phenolate. The resulting values cover a range of about 20 pK/sub a/ units, from 8.3 for HCo(CO)/sub 4/ to 26.6 for CpW(CO)/sub 2/(PMe/sub 3/)H. Hydrides with eta/sup 5/-C/sub 5/Me/sub 5/ ligands are appreciably weaker acids than the corresponding hydrides with eta/sup 5/-C/sub 5/H/sub 5/ ligands (e.g., the pK/sub a/ of (eta/sup 5/-C/sub 5/Me/sub 5/)Fe(CO)/sub 2/H is 26.3, while that of (eta/sup 5/-C/sub 5/H/sub 5/)Fe(CO)/sub 2/H is 19.4). The acidities of the group 8 carbonyl hydrides H/sub 2/M(CO)/sub 4/ decrease in the order Fe > Ru > Os.

• Research Organization: Colorado State Univ., Fort Collins
• OSTI ID: 5659050
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 108:9; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ACETONITRILE
CARBONYLS
CHEMICAL REACTION KINETICS
DATA
ELEMENTS
EQUILIBRIUM
EXPERIMENTAL DATA
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
KINETICS
LIGANDS
METALS
NITRILES
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PH VALUE
REACTION KINETICS
THERMODYNAMIC ACTIVITY
THERMODYNAMICS