Synthesis and characterization of homo- and heterobimetallic diethanolaminates of alkaline earth metals

Heteroleptic heterobimetallic isopropoxide diethanolaminate derivatives of the type {Al(OPir)(2)}(2){M[ (OC2H4)(2)NH](2)} (M = Mg, Ca, Sr Ba) have been prepared by the reactions of homometallic precursor derivatives H2M{ (OC2H4)(2)NH}(2) (1a-1d) with Al(OPri)(3) in 1:2 molar ratio in benzene. The insoluble homometallic precursor derivatives (la-ld) have been synthesized by two alternative routes: (1) reactions of M(OPri)(2) with diethanolamine in 1:2 molar ratio; and (2) reactions of the metals Mg, Ca, Sr and Ba with diethanolamine in 1:2 molar ratio in refluxing toluene. The new homo- and heterobimetallic diethanolaminate derivatives have been characterized by elemental analysis, molecular weight measurements and spectroscopic [IR, NMR (H-1,C-13, Al-27)] studies. (C) 2000 Elsevier Science Ltd All rights reserved.