Nanospheric [M20(OH)12(maleate)12(Me2NH)12]4+ clusters (M = Co, Ni) with O(h) symmetry.
Nanospheric hydroxo-bridged clusters of [M(20)(OH)(12)(maleate)(12)(Me(2)NH)(12)](BF(4))(3)(OH)·nH(2)O (M = Co (1), Ni (2)) with O(h) symmetry were afforded under hydrothermal condition with Co(BF(4))(2)·6H(2)O/Ni(BF(4))(2)·6H(2)O and fumaric acid in a DMF/EtOH mixed solvent. They are characterized by elemental analysis, IR, and X-ray diffraction. X-ray single crystal diffraction analyses show that these two complexes are isostructural containing an ideally cubic M(8) core in that each two M atoms are doubly bridged at the edges by one OH(-) and one maleate, while these OH(-) and maleate groups are coordinated further by exterior identical 12 M atoms which construct a perfect M(12) icosahedron to encapsulate the cubic core. To our knowledge, such large clusters with O(h) symmetry are seldom. The variable-temperature magnetic susceptibility studies reveal that these two isostructures exhibit antiferromagnetic interactions.
Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), School of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin 541004, China.
Liu-Cheng
LC
Gui
Xiu-Jian
XJ
Wang
Qing-Ling
QL
Ni
Miao
M
Wang
Fu-Pei
FP
Liang
Hua-Hong
HH
Zou
D003035:Cobalt / Q000737:chemistry*; D046911:Macromolecular Substances; D015394:Molecular Structure; D054118:Nanospheres / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*
D046911:Macromolecular Substances; D003035:Cobalt; D009532:Nickel; D010100:Oxygen