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Syntheses and Characterizations of Novel One‐dimensional Coordination Polymers Self‐assembled from Co(NCS) 2 and Flexible Diester‐bridged Pyridine‐based Ligands
Author(s) -
Song LiCheng,
Zhang WenXiong,
Hu QingMei
Publication year - 2002
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20020201145
Subject(s) - chemistry , pyridine , thermogravimetry , polymer , infrared spectroscopy , yield (engineering) , coordination polymer , ligand (biochemistry) , crystallography , ion , stereochemistry , medicinal chemistry , inorganic chemistry , organic chemistry , biochemistry , materials science , receptor , metallurgy
The self‐assembly reactions of Co(NCS) 2 with diester‐bridged pyridine‐based ligands pyCO 2 ‐(CH 2 ) m ‐O 2 Cpy (py = 4‐pyridyl; m = 2, 3, 4) have been studied. Interestingly, while Co(NCS) 2 reacted with pyCO 2 ‐(CH 2 ) 2 ‐O 2 Cpy (La) in MeOH/H 2 O 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 2 Cpy (Lb) in MeOH/MeCN and Co(NCS) 2 with pyCO 2 ‐(CH 2 ) 4 ‐Q 2 Cpy (Lc) in EtOH/H 2 O afforded [Co(NCS) 2 (Lb) 2 0.5MeOH] n (3) and [Co(NCS) 2 (Lc) 2 ‐2H 2 O] 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 2 Cpy ligands to form a macrocycle. In addition, the structures of polymers 1–4 were also characterized by infrared spectroscopy, thermogravimetry and elemental analysis.