Table 2. ν _sym(CO) and ν_asym(CO) band positions characterizing Ir(CO)₂(acac) and uncoated and IL-coated metal-oxide-supported Ir(CO)₂ complexes.

Supported Ir(CO)2 complex	ν sym(CO) (cm–1)	ν asym(CO) (cm–1)
Ir(CO)2(acac)	2049	1985
Ir(CO)2(acac) in hexane56	2074	2000
Ir(CO)2/SiO2	2081	2008
Ir(CO)2/TiO2	2076	1988
Ir(CO)2/Fe2O3	2073	1981
Ir(CO)2/CeO2	2071	1982
Ir(CO)2/MgO	2069	1985
Ir(CO)2/La2O3	2066	1977
[BMIM][BF4]-coated Ir(CO)2/SiO2	2052	1981
[BMIM][BF4]-coated Ir(CO)2/TiO2	2055	1971
[BMIM][BF4]-coated Ir(CO)2/Fe2O3	2056	1969
[BMIM][BF4]-coated Ir(CO)2/CeO2	2057	1974
[BMIM][BF4]-coated Ir(CO)2/MgO	2058	1960
[BMIM][BF4]-coated Ir(CO)2/La2O3	2055	1970
[BMIM][Ac]-coated Ir(CO)2/SiO2	2049	1953
[BMIM][Ac]-coated Ir(CO)2/TiO2	2052	1962
[BMIM][Ac]-coated Ir(CO)2/Fe2O3	2053	1947
[BMIM][Ac]-coated Ir(CO)2/CeO2	2050	1966
[BMIM][Ac]-coated Ir(CO)2/MgO	2056	1952
[BMIM][Ac]-coated Ir(CO)2/La2O3	2053	1970
[CPMIM][DCA]-coated Ir(CO)2/SiO2	2098	1974
[CPMIM][DCA]-coated Ir(CO)2/TiO2	2084	1956
[CPMIM][DCA]-coated Ir(CO)2/Fe2O3	2081	1973
[CPMIM][DCA]-coated Ir(CO)2/CeO2	2074	1955
[CPMIM][DCA]-coated Ir(CO)2/MgO	2064	1959
[CPMIM][DCA]-coated Ir(CO)2/La2O3	2061	1991