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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 6
BKCSDE 26(6)
June 20, 2005 

A Novel Linking Schiff-Base Type Ligand (L: py-CH=N-C6H4-N=CH-py) and Its Zinc Coordination Polymers: Preparation of L, 2-Pyridin-3-yl-1H-benzoimidazol, trans-[Zn(H2O)4L2]·(NO3)
Han Na Kim, Hee K. Lee, Soon W. Lee*
Linking Schiff-base ligand, Coordination polymer, Tetramer
A long, bis(monodentate), linking Schiff-base ligand L (py-CH=N-C6H4-N=CH-py) was prepared from 1,4- phenylenediamine and 3-pyridinecarboxaldehyde by the Schiff-base condensation. Ligand L has two terminal pyridyl groups capable of coordinating to metals through their nitrogen atoms. In contrast, the same reaction between 1,2-phenylenediamine and 3-pyridinecarboxaldehyde produced a mixture of imidazol isomers (2-pyridin-3-yl-1H-benzoimidazole), which are connected to one another by the N-H…N hydrogen bonding to form a tetramer. From Zn(NO3)2·6H2O and ligand L under various conditions, one discrete molecule, trans- [Zn(H2O)4L2]·(NO3)2·(MeOH)2, and two 1-D zinc polymers, [Zn(NO3)(H2O)2(L)]·(NO3)·(H2O)2 and [Zn(L)(OBC)(H2O)], were prepared. In ligand L, the N…N separation between the terminal pyridyl groups is 13.994 A, with their nitrogen atoms at the meta positions (3,3’) in a trans manner. The corresponding N…N separations in its compounds range from 13.853 to 14.754 A.
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