Syntheses, structures and luminescent properties of new lanthanide-based coordination polymers based on 1,4-benzenedicarboxylate (bdc)

Reaction of 1,4-benzenedicarboxylic acid (1,4-H2BDC) with EUCl3 center dot 6H(2)O in MeOH in the presence of Et3N and MeCN gives a mixture of the 3-D metal-organic-framework (MOF) materials [Eu-2(1,4-BDC)(3)(MeOH)(4)]center dot 8MeOH (1) and 2-D [Eu(1,4-BDC)(MeOH)(4)]center dot Cl center dot MeOH center dot 0.25H(2)O (2). Similar reactions afforded the isomorphous Gd (3) and Tb (4) analogs of 2. Reaction of 1,4-H2BDC with Ln(NO3)(3).6H(2)O under similar conditions gave [Ln(BDC)NO3(MeOH)(2)]center dot MeCN center dot H2O (Ln = Eu (5) and Cid (6)), which have 2-D framework structures. The structures of 1-6 were determined by single crystal X-ray crystallographic studies and the luminescence properties of I and 4 in DMF solution were determined.