. 2021 Feb 15;6(8):5981–5989. doi: 10.1021/acsomega.1c00307

Table 1. IR ν_CO(A₁) Frequencies of Ni(CO)₃L in CH₂Cl₂^a.

entry	ligand L	complex	ν_CO(A₁) (cm^–1)
1	PPh₃	Ni(CO)₃(PPh₃)	2068.9^a
2	1a (PFc₃)	2a	2062.7
3	1b (PFc₂Ph)	2b	2064.7
4	1c	2c	2064.7
5	1d	2d	2068.5

The same number was reported in ref (7).

Table 1. IR νCO(A1) Frequencies of Ni(CO)3L in CH2Cl2a.