in sodium hydroxide; ethanol aq. NaOH; addn. of aq. NaOH soln. and hot aq. soln. of Co(CH3CO2)2*4H2O to an alc. soln. of Schiff's base (3.3'-bis(salicylidene-amino)-dipropylamine) formed out of 3.3'-diamino-dipropylamine in 95percent ethanol and salicylaldehyde; evaporation at reduced pressure;; washing the ppt. with H2O; drying in vac.;;
Rao, Chebrolu P.; Sreedhara, Alavattam; Rao, P. Venkateswara; Verghese, M. Bindu; Rissanen, Kari; Kolehmainen, Erkki; Lokanath; Sridhar; Prasad, J. Sashidhara
Journal of the Chemical Society - Dalton Transactions, 1998 , # 14 p. 2383 - 2393