title: From racemic compound to spontaneous resolution: a linker-imposed evolution of chiral [MnMo(9)O(32)](6-)-based polyoxometalate compounds.
abstract: Five compounds based on [MnMo(9)O(32)](6-): (Himi)(6)[MnMo(9)O(32)] (1) (imi=imidazole), Na(2)(Himi)(4)[MnMo(9)O(32)]2 H(2)O (2), Na(3)(Himi)(3)[MnMo(9)O(32)] (3), D-NH(4)Mn(2.5)[MnMo(9)O(32)]11 H(2)O (4 a), and L-NH(4)Mn(2.5)[MnMo(9)O(32)]11 H(2)O (4 b) were prepared and characterized. X-ray crystallographic analysis revealed that compounds 1 and 2 with imidazole molecules as linkers are racemic compounds; compound 3 is a racemic solid solution of Na(+) cations and the polyoxoanion [MnMo(9)O(32)](6-); and compounds 4 a and 4 b are enantiomers. In compound 4, the homochiral polyoxoanions [MnMo(9)O(32)](6-) are connected by Mn(2+) cations to form a unique (4(5)6)(4(7)6(8)) topology net framework. By adjusting the linkers from imidazole molecules to Na(+) and finally Mn(2+) cations, the chiral polyoxoanions [MnMo(9)O(32)](6-) were changed from a racemic compound to a conglomerate. This means that spontaneous resolution can be efficiently realized by connecting homochiral polyoxoanions into one-dimensional (1D), 2D, and 3D structures, with an emphasis on using appropriate linkers with substantial interaction strength, directionality, and enantioselectivity.
authors.affiliation: Key Laboratory of Polyoxometalate Science of Ministry of Education, Department of Chemistry, Northeast Normal University, Changchun, PR China.
authors.forename: Huaqiao
authors.initials: H
authors.lastname: Tan
authors.forename: Yangguang
authors.initials: Y
authors.lastname: Li
authors.forename: Weilin
authors.initials: W
authors.lastname: Chen
authors.forename: Ding
authors.initials: D
authors.lastname: Liu
authors.forename: Zhongmin
authors.initials: Z
authors.lastname: Su
authors.forename: Ying
authors.initials: Y
authors.lastname: Lu
authors.forename: Enbo
authors.initials: E
authors.lastname: Wang