摘要
A series of Al-compounds incorporating the bidentate pyrrole-morpholine precursor C 4 H 3 NH [2-CH 2 N(CH 2 CH 2 ) 2 O] (1) and aluminum-alkyl have been conveniently synthesized and characterized by 1 H and 13 C NMR spectroscopy. Reacting one or two equivalents of 1 with AlMe 3 in toluene afforded AlMe 2 {C 4 H 3 N [2-CH 2 N(CH 2 CH 2 ) 2 O]} (2) and AlMe{C 4 H 3 N [2-CH 2 N(CH 2 CH 2 ) 2 O]} 2 (3), respectively, in moderate yield. Furthermore, compound (4), AlMe 2 {C 4 H 3 N [2-CH 2 N(CH 2 CH 2 ) 2 O]}·AlMe 3 , was acquired either by the combination of 2 and one equivalent of AlMe 3 or directly from the reaction between 1 and two equivalents of AlMe 3 . The molecular structures of 1, 2, and 4, were determined by single crystal X-ray diffractometry in solid state, showing a distorted tetrahedral arrangement around the Al atom in 2 and 4. All the aluminum compounds could effectively initiate the ring-opening polymerization (ROP) of ε-caprolactone in a well-controlled manner with molecular weight distributions (PDI = 1.03-1.49).