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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 | 2021 Jun

REPOSITORIES: biostudies-literature

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

Park Chanwoo C   Hwang Jeong Min JM   Go Yongmin Y   Choi Heenang H   Park Bo Keun BK   Kim Chang Gyoun CG   Ryu Ji Yeon JY   Hong Chang Seop CS   Chung Taek-Mo TM  

ACS omega 20210607 24

New heteroleptic strontium complexes were synthesized using substitution reaction of bis(trimethylsilyl)amide of Sr(btsa)<sub>2</sub>·2DME with aminoalkoxide and β-diketonate ligands. The complexes [Sr(bdmp)(btsa)]<sub>2</sub>·2THF (<b>1</b>), [Sr(bdeamp)(btsa)]<sub>2</sub> (<b>2</b>), [Sr(dadamb)(btsa)]<sub>2</sub> (<b>3</b>), [Sr(bdmp)(hfac)]<sub>3</sub> (<b>4</b>), [Sr(bdeamp)(hfac)]<sub>3</sub> (<b>5</b>), [Sr(dadamb)(hfac)]<sub>3</sub> (<b>6</b>), and [Sr<sub>3</sub>(dadamb)<sub>4</sub>(tmh  ...[more]

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