A variety of 1D to 3D metal-organic coordination Architectures assembled with 1,1′-(2,2′-oxybis(ethane-2,1-diyl))bis(1H-imidazole)

A new tone, flexible ligand, L = 1,1'-(2,2'-oxybis(ethane-2,1-diyl))bis(1H-imidazole), has been prepared. The hydrothermal reactions of L with various metal ions (M(II) = Co, Zn, and Cd) as well as a series of aromatic polycarboxylate co-ligands yielded seven new metal-organic frameworks consisting of 1D, 2D, and 3D structures. Complexes 1-5 are constructed by SBU I (a M2L2 metallocycle), while complexes 6 and 7 are assembled by SBU II (left- and right-handed helical [M(L)](n) chains). In 1 and 2, the SBUs I are bridged by 1,2-BDC (1,2-benzenedicarboxylate) and 3,5-DNP (3,5-dinitrophthalate) anions with the same coordination modes to generate ID chains with repeated rings. 3 exhibits a typically 3-fold interpenetrated 3-connected (10,3)-b net. in 4, the Co centers are connected by mu(3)-OH and carboxylic O atoms to form a cobalt-oxygen tetranuclear cluster. 5 represents an uncommon example of a 3,4-connected net with (83)2(85 X 10) topology. In 6, the SBUs II are extended by 1,4-BDC (1,4-benzenedicarboxylate) anions to afford highly undulated 2D (4, 4) layers. In 7, the [Cd-3(1,3-BDC)(3)] ladders connect to SBUs II to form a corrugated 2D network. A comparison of all complexes demonstrates that the structural characteristics of L ligand and organic counteranions simultaneously play an important role in the construction of the complexes. In addition, complexes 3 and 7 exhibit strong blue photoluminescence, and compound 4 is an antiferromagnet.