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Therefore, symmetrie CO group vibrations occur at higher frequencies than asymmetrie vibrations, facilitating the interpretation of the IR spectra of metal carbonyls. , 50" and 2n. 1c) where k is the force constant calculated by the Cotton-Kraihanzel method in [N m - I ] while a and IJ are populations of 50" and 2n orbitals in the CO group. Both coefficients a and b are negative, as could be expected from the antibonding character of 2n and 50" orbitals. 4. 2) The constant k d depends on electron configuration of the metal atom and on the position of the element in the Periodic Table.

For some anionic ligands, the names are formed in a modified way by changing the termination or the name itself, for ex am pie, fluoride-fluoro, chloride-chloro. 5. , and neutralligands are named without changes. Ligands H 2 0, NH 3 , CO, and NO are named aqua, ammine, carbonyl, and nitrosyl, respectively. The ending -ato is given to ligands derived from organic compounds by the loss of protons. The oxidation state of the metal is given in Roman numerals or the cipher 0 in parentheses after the compound name.

52, 4329 (1970). CL. H. Jones, R. S. McDowell, and M. Goldblatt, J. ehern. , 48, 2663 (1968). dEo P. Kundig, M. Moskovits, and G. A. Ozin, J. Mol. , 14, 137 (1972). 11. The IR Spectra 01 Trinuclear Carbonylsa Solvent v(CO) (ern-I) [Fe 3 (CO)12] [RuFe 2(CO)12] n-Hexane n-Hexane [OsFe2(CO)12] n-Hexane 2046s, 2023m, 2013sh, 1867vw, 1835w 2115w, 2052s, 2040s, 2021sh, 2oo0m, 1989sh, 1860vw, 1828w 2117w, 2055s, 2041s, 2036m, 2013m, 200 1m, 1990sh, 1860vw, 1827vw 2063w, 1999s, 1990s, 1972s, 1944m, 1903w, 1827w, 1785w 2077w, 2oo8m, 1987s, 1943m, 1903w, 1814w, 1783w 2075w, 2oo6m, 1991s, 1946m, 1903w, 1814w, 1785w 2068s, 2035s, 2014m, 2oo2m 2061,2s, 2031,3s, 2018,7w, 2012,5m Compound [Et 4N] [MnFe(CO )12] THF [Et 4N] [ TcFe 2(CO)12] THF [Et 4N] [ ReFe2(CO)12] THF [OSJ(COh2] [RU J(CO)12] a Aeeording to Referenees 146-149.

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