Solvent and additive-controlled supramolecular isomerism in zinc coordination polymers
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A new series of Zn(II) supramolecular isomers containing ditopic 1,3-di(pyridin-4-yl)urea ( 4bpu ) ligand were synthesized and characterized by infrared analysis, elemental analysis and TGA as well as single-crystal X-ray diffraction analysis. Four solvent-induced pseudopolymorphic zinc (II) coordination polymers (CPs), namely, {[Zn(4bpu)(OAc) 2 ](CH 3 OH)} n ( 1 ), {[Zn(4bpu)(OAc) 2 ](C 2 H 5 OH)} n ( 2 ), {[Zn(4bpu)(OAc) 2 ](HOCH 2 CH 2 OH)} n ( 3 ), and {[Zn(4bpu)(OAc) 2 ](0.5H 2 O)} n ( 4 ), were prepared by the reaction of Zn(OAc) 2 .2H 2 O and 4bpu via self-assembly under varying solvent systems. Also, a pair of polymorphic coordination polymers namely, {[Zn(4bpu)(OAc) 2 ](CH 3 OH)} n ( 1α ) and {[Zn 3 (4bpu) 3 (OAc) 6 ](CH 3 OH) 2 } n (1β) , was prepared in the presence of different organic additives. Single-crystal X-ray diffraction confirmed that 1−4 and 1α display 1D polymeric zig-zag chains and 1β exhibits 1D triple-stranded ladders that were self-assembled through various supramolecular interactions. In addition, a series of dissolution-recrystallization structural transformations (DRST) were performed on these supramolecular isomers.
