Cyclohexanediylbis(nitrilomethylidyne)]bis[4,6‐bis(1,1‐dimethylethyl)‐phenolato]](2‐)‐ N , N ′ , O , O ′ ]‐,[SP‐4‐2‐(1 R ‐ trans )]‐; N , N ′ ‐bis(3,5‐di‐ tert ‐butylsalicylidene)‐1,2‐diaminocyclohexanecobalt(II)