Synthesis of Mononuclear Strontium Complexes with Polyether and β-Diketonato Ligands.

Strontium β-diketonate complexes were synthesized by the substitution reaction of the bis(trimethylsilyl) amide of Sr(btsa) 2 ·2DME with an ethereal group and β-diketonate ligands. The compounds [Sr(tmge)(btsa)] 2 ( 1 ), [Sr(tod)(btsa)] 2 ( 2 ), Sr(tmgeH)(tfac) 2 ( 3 ), Sr(tmgeH)(acac) 2 ( 4 ), Sr(tmgeH)(tmhd) 2 ( 5 ), Sr(todH)(tfac) 2 ( 6 ), Sr(todH)(acac) 2 ( 7 ), Sr(todH)(tmhd) 2 ( 8 ), Sr(todH)(hfac) 2 ( 9 ), Sr(dmts)(hfac) 2 ( 10 ), [Sr(mee)(tmhd) 2 ] 2 ( 11 ), and Sr(dts)(hfac) 2 ·DME ( 12 ) were obtained and analyzed by various techniques, including FT-IR, NMR, TGA (thermogravimetric analyses), and elemental analysis. Complexes 1 , 3 , 8 , 9 , 10 , 11 , and 12 were further structurally confirmed by single-crystal X-ray crystallography, where complexes 1 and 11 showed dimeric structures with μ 2 -O bonds of ethereal groups or tmhd ligands, and complexes 3 , 8 , 9 , 10 , and 12 displayed monomeric structures. Interestingly, compounds 10 and 12 , which preceded trimethylsilylation of the coordinating ethereal alcohols such as tmhgeH and meeH in the presence of HMDS as by-products due to highly increasing acidity of them, originated from electron-withdrawing two hfac ligands.