Solvent triggered structural diversity of triple-stranded helicates: single molecular magnets

Dalton Transactions : an International Journal of Inorganic Chemistry
Hongfeng LiPengfei Yan

Abstract

Multiple-stranded helicates are of interest in respect of their simplicity in geometry and significance in biology and materials. Bis-β-diketones have shown their advantage in terms of structure and geometry in the construction of multiple-stranded helicates, but further studies on their properties are limited due to their poor crystallization. In this study, solvents are found to play a decisive role in the crystallization of triple-stranded helicates. [Dy2(BTB)3(H2O)4] is used as a precursor to solvent-dependently crystallize three complexes [Dy2(BTB)3(CH3OH)4]·3CH3OH (1), [Dy2(BTB)3(DME)2] (2) and [Dy2(BTB)3(DOA)(H2O)2]·4.5DOA (3) (BTB = 3,3'-bis(4,4,4-trifluoro-1,3-dioxobutyl)biphenyl), where the key structural motif of the triple-stranded helicate, [Dy2(BTB)3], is retained. Four methanol molecules are found to ligate to Dy(3+) ions in 1, while each Dy(3+) ion is chelated by one DME molecule in 2. Interestingly, it is observed that 1,4-dioxane as a bridge ligates to two adjacent Dy(3+) ions, giving rise to the formation of a 1D chain structure. Magnetic measurement shows that 1 and 2 display slow magnetic relaxation under zero dc field, while single molecular magnet behavior is obtained for 3 under an applied dc field of 20...Continue Reading

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Citations

Dec 16, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Mei GuoJinkui Tang
Feb 19, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Xingrui GaoPeng Chen
Jun 4, 2020·Chemistry : a European Journal·Erica GiraldiKay Severin
Apr 21, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·A J BrockJ K Clegg

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