Source of materialThe title compound wasprepared by modification of the reported method [1][2][3][4]. Toanethanol solution (10 ml) of salicylaldehyde (245.5 mg, 2.01 mmol) wasadded anethanol solution (3 ml) of 1,4-bis(aminooxy)butane (120.12 mg, 1.0 mmol). The mixture solution wasstirred at55°Cfor 4h.After coolingtoroom temperature, the precipitate wasf iltered and washed successively with ethanol and ethanol/ hexane (1:4), respectively.The product wasd ried under vacuum, and 170.7 mg of colorless crystalline solid were obtained (yield 52 %, m.p. 77-78°C). Single crystals suitable for X-raycrystalstructure analysis were grown up atRT by slow evaporation from asolutionof2,2¢ -((1,4-butylene)dioxybis(nitrilomethylidyne))diphenol in acetonitrile. Elementalanalysis -found: C,65.76 %; H,6.08 %; N,8.61 %; calc. for C 18 H 20 N 2 O 4 :C,65.84 %; H,6.14 %; N,8.53 %.
DiscussionThe study of aserieso f N , N ¢ -bis(salicylidene)ethylenediamine (salen) and its derivatives is important to anunderstanding of the structures and characteristics of functionalc omplexes, because these compounds canaccommodate one, two or more metalcenters and form homo-and heteronuclearmetalcomplexes with interesting properties [5,6].