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 PA2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.