Structural diversity and fluorescent properties of new metal-organic frameworks constructed from pamoic acid and different N-donor ligands

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• 作者：Li-Na Zhang^a ; ^b ; Xiao-Li Sun^a ; Chen-Xia Du^a ; ^{dcx@zzu.edu.cn" class="auth_mail} ; Hong-Wei Hou^a ; ^{houhongw@zzu.edu.cn" class="auth_mail}
• 关键词：Metal&ndash ; organic framework ; Pamoic acid ; Crystal structure ; Luminescence
• 刊名：Polyhedron
• 出版年：18 April, 2014
• 年：2014
• 卷：72
• 期：Complete
• 页码：90-95
• 全文大小：1917 K

文摘

Five new metal-organic frameworks, namely [Cd(PA)(H₂O)(DMF)₂]_n (1), {[Co(PA)(4,4鈥?bipy)(H₂O) (CH₃OH)]路DMF}_n (2), {[Cd₂(PA)₂(4,4鈥?bipy)_1.5(H₂O)₃]路2DMF路2H₂O}_n (3), {[Ni(PA)(bpp)(H₂O)₂]路DMF}_n (4) and {[Cd(PA)(bpp)(CH₃OH)]路CH₃OH}_n (5), (H₂PA = pamoic acid, 4,4鈥?bipy = 4,4鈥?bipyridine, bpp = 1,3-bi(4-pyridyl) propane), have been solvothermally synthesized and characterized by elemental analysis, IR and X-ray diffraction. Complex 1 displays a zigzag chain structure, while both 2 and 4 are 2D layered polymers. In complex 3, two crystallographically independent Cd²⁺ ions are bridged by PA^{2鈭?/sup> anions alternately to form an infinite (Cd-PA2鈭?/sup>)_n chain, which extends into a 2D network through 4,4鈥?bipy linkers. Complex 5 possesses a 3D framework with the point symbol of (83路102路12). Various weak interactions may play a key role in stabilizing the observed structures. Their luminescent properties and thermal stabilities have also been investigated. Complex 5 displays strong green luminescence with an emission maximum at 548 nm.}