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摘要
Two new coordination polymers [Co(H2O)(2)(bpy)(2)]center dot 2(Adi) (1) and [Co-4(OH)(2)(Adi)(6)(bpe)(2)] (2) (HAdi = 4-amino-3,5-diiodobenzoic acid, bpy = 4,4'-bipyridine, bpe = 1,2-bis(4-pyridyl)ethylene) have been synthesized by methods of hydrothermal reactions and their crystal structures determined. In 1, the mononuclear Co atoms are linked by bpy ligands forming cationic two-dimensional square grids, which are connected by the intercalated Adi guest molecules through significant hydrogen-bonding interactions to give a three-dimensional supramolecular porous network with one-dimensional channels. 2 has a one-dimensional chain structure based on rhombic tetranuclear Co-II clusters, connected by bpe ligands. Through special I center dot center dot center dot I interactions, adjacent chains are extended into a three-dimensional supramolecular structure. The structure versatility indicates that the amino and iodo groups of Adi ligands play a crucial role in modulating the coordination polymers. A discussion of the crystal structures, thermal stabilities, as well as the noncovalent interactions of Adi molecules is provided. IR, elemental analysis and XRPD confirmed the phase purity of the bulk materials. Magnetic properties of 2 in the 300-2 K have been discussed, which reveal the occurrence of antiferromagnetic interactions between Co-II ions.
- 出版日期2017-7
- 单位广东工业大学
