Journal
CRYSTENGCOMM
Volume 13, Issue 8, Pages 3080-3086Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0ce00864h
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Funding
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (CAS) [SZD08002-2]
- National Basic Research Program of China (973 Program) [2007CB815306]
- National Natural Science Foundation of China [20733003, 20903096]
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Two new Mn-II coordination polymers, {[Mn-4(TBIP)(4)(CH3OH)(2)]center dot(H2O)(2)}(n) (1) and {[Mn-3(TBIP)(2)(HTBIP)(2)((CH3)(2)CHOH)(2)]}(n) (2) (H2TBIP = 5-tert-butyl isophthalic acid), have been synthesized by a solvothermal reaction and characterized magnetically. Single-crystal X-ray diffraction studies reveal that 1 is a three-dimensional framework, which is based on a helical chain with a new periodic -J(1)J(1)J(2)J(2)-sequence. Compound 2 has a two dimensional layer structure constructed by trinuclear Mn(II) subunits that are extended into a 3D architecture by hydrogen bonds. Magnetic measurements indicate that both of the compounds show ferrimagnetic behaviour with different spin topologies. Compound 1 is a rare even-spin centre homometallic ferrimagnetic compound, in which the ferrimagnetism arises from the nature of carboxylate bridging modes. It is also the first example of a 3D homometallic ferrimagnetic compound, featuring a ferrimagnetic helical chain with a (5/2, 15/2) spin topology and a 1/2 magnetization plateau. Compound 2 is a three-spin centre homometallic ferrimagnetic complex with a (5/2, 10/2) spin topology and a 1/3 magnetization plateau.
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