Table 2. Experimental details.

Crystal data
Chemical formula	[Co(NH3)6][Co(CO)4]2
M r	503.07
Crystal system, space group	Trigonal, R
Temperature (K)	100
a, c ()	9.3679(4), 18.3089(18)
V (3)	1391.48(18)
Z	3
Radiation type	Mo K
(mm1)	2.70
Crystal size (mm)	0.16 0.12 0.08
Data collection
Diffractometer	Stoe IPDS2T
Absorption correction	Integration (X-RED32 and X-SHAPE; Stoe Cie, 2009 ▸)
T min, T max	0.649, 0.907
No. of measured, independent and observed [I > 2(I)] reflections	7025, 994, 910
R int	0.087
(sin /)max (1)	0.724
Refinement
R[F 2 > 2(F 2)], wR(F 2), S	0.034, 0.090, 1.08
No. of reflections	994
No. of parameters	52
H-atom treatment	All H-atom parameters refined
max, min (e 3)	0.87, 0.65

Computer programs: X-AREA (Stoe Cie, 2011 ▸), X-RED32 (Stoe Cie, 2009 ▸), SHELXT (Sheldrick, 2015a ▸), SHELXLE (Hbschle et al., 2011 ▸) and SHELXL2014 (Sheldrick, 2015b ▸), DIAMOND (Brandenburg, 2015 ▸) and publCIF (Westrip, 2010 ▸).