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Synthesis and Crystal Structures of New Strontium Complexes with Aminoalkoxy and β-Diketonato Ligands.

ABSTRACT: New heteroleptic strontium complexes were synthesized using substitution reaction of bis(trimethylsilyl)amide of Sr(btsa)₂·2DME with aminoalkoxide and β-diketonate ligands. The complexes [Sr(bdmp)(btsa)]₂·2THF (1), [Sr(bdeamp)(btsa)]₂ (2), [Sr(dadamb)(btsa)]₂ (3), [Sr(bdmp)(hfac)]₃ (4), [Sr(bdeamp)(hfac)]₃ (5), [Sr(dadamb)(hfac)]₃ (6), and [Sr₃(dadamb)₄(tmhd)₂] (7) were prepared and characterized by means of various analysis techniques such as Fourier transform infrared, NMR, thermogravimetric analysis, and elemental analysis. Complexes 1-3 were further structurally confirmed by single-crystal X-ray crystallography, and they displayed dimeric structures in which strontium atoms were connected by alkoxide oxygen atoms of the μ₂ type. Compound 1 has a trigonal prismatic structure, whereas 2 and 3 have a distorted square pyramidal structure. In complexes 5-7, trimeric structures were obtained with strontium atoms connected by μ₃-O bonds of alkoxide oxygen atoms and μ₂-O bonds of alkoxide and β-diketonate oxygen atoms. The crystal structures of 5, 6, and 7 showed distorted capped octahedral geometry, while 7 (middle Sr atom) displayed a distorted trigonal prism geometry. Complexes 5-7 displayed ∼70% mass loss in the temperature range from 25 to 315 °C.

SUBMITTER: Park C

PROVIDER: S-EPMC8223417 | biostudies-literature |

REPOSITORIES: biostudies-literature

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