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. 2021 Oct 21;60(21):16713–16725. doi: 10.1021/acs.inorgchem.1c02582

Table 4. IR Frequencies (cm–1) of the Terminal (νtCO) and Bridging (νbCO) Carbonyl Groups for 1n in CH3CN as a Function of Cluster Charge n.

cluster charge n νtCO νbCO
–5 2010 1868
–6 1993 1856
–7 1978 1843
–8 1959 1830
–9 1942 1819