Syntheses and Characterizations of Novel One-dimensional Coordination Polymers Self-assembled from Co(NCS)_2 and Flexible Diester-bridged Pyridine-based Ligands  

作　　者：宋礼成 张文雄 胡青眉 

出　　处：《Chinese Journal of Chemistry》2002年第11期1421-1429,1134,共10页中国化学（英文版）

基　　金：theNationalNaturalScienceFoundationofChina (No.2 9932 0 2 0 )

摘　　要：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) 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.

关 键 词：coordination polymer self-assembly Co(NCS)  2 bridged dipyridyl ligand crystal structure 

分 类 号：O641.4[理学—物理化学]