Particular Handedness Excess through Symmetry-Breaking Crystallization of a 3D Cobalt Phosphonate
摘要:
A 3D chiral cobalt phosphonate has been obtained from achiral precursors in the absence of chiral inducers. Remarkably, the bulk sample is largely enantio-enriched with particular handedness through symmetry-breaking crystallization in spite of multiple repeated experiments. Moreover, protonation of this chiral material introduces Bronsted acid sites, the structure of which is unique to the heterogeneous phase for the ring opening of epoxies.
Particular Handedness Excess through Symmetry-Breaking Crystallization of a 3D Cobalt Phosphonate
作者:Chao-Ying Gao、Fei Wang、Hong-Rui Tian、Lei-Jiao Li、Jian Zhang、Zhong-Ming Sun
DOI:10.1021/acs.inorgchem.5b02187
日期:2016.1.19
A 3D chiral cobalt phosphonate has been obtained from achiral precursors in the absence of chiral inducers. Remarkably, the bulk sample is largely enantio-enriched with particular handedness through symmetry-breaking crystallization in spite of multiple repeated experiments. Moreover, protonation of this chiral material introduces Bronsted acid sites, the structure of which is unique to the heterogeneous phase for the ring opening of epoxies.
Structural Study of Hydrated/Dehydrated Manganese Thiophene-2,5-diphosphonate Metal Organic Frameworks, Mn<sub>2</sub>(O<sub>3</sub>P–C<sub>4</sub>H<sub>2</sub>S–PO<sub>3</sub>)·2H<sub>2</sub>O
作者:Jean-Michel Rueff、Olivier Perez、Alain Pautrat、Nicolas Barrier、Gary B. Hix、Sylvie Hernot、Hélène Couthon-Gourvès、Paul-Alain Jaffrès
DOI:10.1021/ic301187y
日期:2012.10.1
adopt a different orientation likely due to rotation around the P–C bonds and via the dehydrated state 5, which is likely more flexible than the hydrated states. Study of the magnetic properties performed on compound 3 and 4 and on the dehydrated compounds Mn2(O3P–C4H2S–PO3) 5 complemented by the structural study has permitted us to characterize the antiferromagnetic ground state of sample 3, a weak
报告了噻吩-2,5-二膦酸2的合成,并报道了其用于原始原始材料Mn 2(O 3 P–C 4 H 2 S–PO 3)·2H 2 O 3的合成。材料3的结构已经由单晶X射线衍射完全解析。Mn 2(O 3 P–C 4 H 2 S–PO 3)·2H 2 O 3在单斜晶胞(空间群P 2)中结晶,具有以下参数:a = 11.60(1)Å,b = 4.943(5)Å,c = 19.614(13)Å,β= 107.22°。化合物3的结构的显着特征是噻吩杂环的取向,该噻吩杂环在两个连续的层中(沿着c)采用两个不同的取向。化合物3的热分析表明,从160至230℃容易除去水分子,而脱水结构在500℃以下仍稳定。可以将3中获得的脱水化合物再水化,得到多晶型化合物Mn 2(O 3 P–C 4 H 2 S–PO 3)·2H 2 O 4,在具有以下参数的正交晶胞(空间群Pnam)中结晶:a = 7.5359(3)Å,b