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The self-assembly reactions of Co(NCS) 2 with diester-bridged pyridine-based ligands pyCO 2-(CH 2) m-O 2Cpy (py=4-pyridyl; m=2, 3, 4) have been studied. Interestingly, while Co~(NCS) 2 reacted with pyCO 2-(CH 2) 2-O 2Cpy (La) in MeOH/H 2O or THF/MeCN to yield two coordination polymers [Co~(NCS) 2(La) 2] n(1) and [Co(NCS) 2(La) 2·2THF] n(2), reactions of Co(NCS) 2 with pyCO 2-(CH 2) 3-O 2Cpy (Lb) in MeOH/MeCN and Co(NCS) 2 with pyCO 2-(CH 2) 4-O 2Cpy (Lc) in EtOH/H 2O afforded [Co(NCS) 2(Lb) 2· 0.5MeOH] n(3) and [Co(NCS) 2(Lc) 2·2H 2O] n(4), respectively. The X-ray diffraction analyses indicated that polymers 1-4 consist of a one-dimensional Co(II) chain in which each of the two adjacent Co(II) ions is bridged by two pyCO 2-(CH 2) m-O 2Cpy ligands to form a macrocycle. In addition, the structures of polymers 1-4 were also characterized by infrared spectroscopy, thermogravimetry and elemental analysis.
The self-assembly reactions of Co (NCS) 2 with diester-bridged pyridine-based ligands pyCO 2- (CH 2) mO 2Cpy (py = 4-pyridyl; m = 2, 3, 4) have been studied. Interestingly, while Co (NCS) 2 reacted with pyCO 2- (CH 2) 2-O 2Cpy (La) in MeOH / H 2O or THF / MeCN to yield two coordination polymers [Co ~ (NCS) 2 1) and reactions of Co (NCS) 2 with pyCO 2- (CH 2) 3-O 2Cpy (Lb) in MeOH / MeCN and Co NCS 2 with pyCO 2- (CH 2) 4-O 2Cpy (Lc) in EtOH / H 2O afforded [Co (NCS) 2 (Lb) 2 · 0.5MeOH] n Lc) 2 · 2H 2O] n (4), respectively. The X-ray analysis shows that polymers 1-4 consist of a one-dimensional Co (II) chain in which each of the two adjacent Co bridged by two pyCO 2- (CH 2) mO 2Cpy ligands to form a macrocycle. In addition, the structures of polymers 1-4 are also characterized by infrared spectroscopy, thermogravimetry and elemental analysis.