A heterometallic nanosized tube {Fe[(CN)(6)](2)[Co(LN3O2)](3)}(n) and two of its lamellar polymorphous isomers

Single crystals of three polymorphous compounds were synthesized started from two building blocks, [Fe(CN)(6)](3-) and [Co(L-N3O2)](2+) (L is a Schiff-base macrocyclic ligand derived from the condensation of 2,6-diacetylpyridine with 3,6-dioxaoctane-1,8-diamine) using a crystallization condition control. All three compounds consist of electroneutral skeletons made up of Fe6Co6 twelve-metal ring units, which is the smallest enclosed circle in their structures: 1 is comprised of 1D nanometer-diameter tubes possessing nanometer-sized tunnels (0.58 nm x 0.74 nm); 2 and 3 are based on piled-up 2D lamellar layers in the (6, 3) and (4, 4) networks, respectively. Magnetic studies indicate ferromagnetic interactions between cyanide-bridged cobalt(II) and iron(III) in each compound.State Major Basic Research Development Program of China [2013CB933401, 2013CB632602]; "973" Project [2012CBA01202]; NFSC [21321001]; Key Research Program of the Chinese Academy of Sciences [KGZD-EW-201-1]SCI(E)ARTICLEpfeng@ipe.ac.cn; gaosong@pku.edu.cn; hzliu@ipe.ac.cn397490-74951