Synthesis, crystal structures and characterization of four coordination polymers based on 5-amino-2,4,6-triiodoisophthalic acid

One homochiral 1D coordination polymer [Cu(ATIBDC)(2,2'-bipy)] center dot 3H(2)O center dot CH3OH (1) and three achiral 1D coordination polymers: [Cd(ATIBDC)(2,2'-bipy)(H2O)] center dot 3H(2)O (2), [Cd(ATIBDC)(phen)(H2O)] center dot 4H(2)O (3), and [Mn(ATIBDC)(phen)(2)] center dot 5H(2)O (4) have been synthesized and characterized (H(2)ATIBDC=5-amino-2,4,6-triiodoisophthalic acid, 2,2'-bipy=2,2'-bipyridine, and phen= 1,10-phenanthroline). Extended high dimensional network architectures are further constructed with the help of weak secondary interactions, such as hydrogen bonding, aromatic stacking, and halogen bonding (C-1... pi and C-I... N/O). Complex 1 crystallizes in the monoclinic system with chiral space group P2(1) and exhibits a right-handed 21 helical chain structure. The homochirality of 1 was confirmed by CD spectrum. Interestingly, two new configurations of decameric water cluster are found in 3 and 4. The acyclic tetrameric cluster (H2O)(3)(CH3OH) in 1 and (H2O)(4) in 2 array into highly ordered helical infinite chains. Thermal stabilities of all the complexes have been studied. Solid state fluorescent properties of the Cd(II) complexes have been explored. (C) 2011 Elsevier Inc. All rights reserved.