A treatment of MCl2 (M = Zn, Ni, Co, Mg) with the indicator chrome pure blue BX (Na2cpb) yielded new coordination polymers, {[M(H2O)6][M(cpb)2(H2O)2]•(H2O)9}n (M = Zn (1), Ni (2), Co (3)) and {[Mg(H2O)6][Mg(cpb)2(H2O)2]•(H2O)6}n (4)). These compounds, which are crystallographically isostructural, show helical 1D nano-tube structures. Coordination polymers bearing organic bridging ligands with large conjugating system have attracted intense attention to prepare coordination materials with new network motifs and various properties based on the ligands. 1-3 For example, numerous coordination polymers have been prepared by using organic bridging ligands with porphyrin component. 2
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