Open AccessSynthesis and Crystal Structures of New Strontium Complexes with Aminoalkoxy and β-Diketonato Ligands
Author(s) -
Chanwoo Park,
Jeong Min Hwang,
Yongmin Go,
Hana Choi,
Bo Keun Park,
Chang Gyoun Kim,
Ji Yeon Ryu,
Chang Seop Hong,
TaekMo Chung
Publication year - 2021
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.1c01624
Subject(s) - strontium , chemistry , alkoxide , crystallography , crystal structure , octahedron , square pyramidal molecular geometry , amide , octahedral molecular geometry , stereochemistry , catalysis , organic chemistry
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 [Sr 3 (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 μ 2 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 μ 3 -O bonds of alkoxide oxygen atoms and μ 2 -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.