Dalton2010-1552-5NO2-间苯二酸.pdfVIP

View Online PAPER /dalton | Dalton Transactions Nanoporous lanthanide-carboxylate frameworks based on 5-nitroisophthalic acid† San-Ping Chen,*a Yi-Xia Ren,a ,b Wei-Tao Wanga and Sheng-Li Gao*a Received 22nd July 2009, Accepted 29th October 2009 First published as an Advance Article on the web 15th December 2009 DOI: 10.1039/b914879e The reactions of lanthanide nitrates with 5-nitroisophthalic acid (ab. 5-H2 nip) in DMF and 0 ethanol (1 : 1) mixed solution gave rise to three nanoporous lanthanide polymers, 1 E 0 9 {[Ln (5-nip) (DMF) ](DMF) } (Ln = Nd (1), Dy (2), Ho (3), 5-nip = 5-nitroisophthalate). 2 7 2 3 4 2 n r 8 e 4 Single-crystal X-ray diffraction analyses reveal that they are isomorphous and feature three-dimensional b 1 m 9 e B metal–organic frameworks with two-dimensional intersecting channels occupied by guest DMF t / p 9 e 3 molecules constructed from the linkage of dimer Ln C O SBUs and 5-nip ligands. The guest DMF S 0 2 6 12 1 1. 2 0 molecules can be reversibly removed from 2 as identified using TGA-DSC and PXRD. The heat of n 1 : - 1 o i o adsorption of the guest-free sample of 2 with DMF was measured with a value of 10.3 kJ mol by an y d t | i RD496-III type microcalorimeter. In addition, the photoluminescent property of 2 was investigated. s