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Z. Naturforsch. 2014,
69b, 878 – 884
doi:10.5560/ZNB.2014-4123
Anion Effect on the Structural Diversity of 1-D and 2-D Zinc(II) Coordination Polymers with a Flexible Fluorinated Bis(imidazole) Ligand
Key Laboratory of Fine Petro-chemical Technology, Changzhou University, Changzhou 213164, P. R. China
Reprint requests to Dr. S.-C. Chen and Prof. M.-Y. He. Fax: +8651986330251. E-mail:
cscczu@yahoo.com (S.-C. Chen),
hmy@cczu.edu.cn (M.-Y. He)
Received June 22, 2014 / published online August 12, 2014
Reactions of a flexible fluorinated ligand, 2,3,5,6-tetrafluoro-1,4-bis(imidazol-1-yl-methyl)benzene (Fbix), with ZnX2 (X = OAc− or NO3–) lead to the formation of the two new ZnII coordination polymers [Zn(Fbix)(OAc)2]n (1) and {[Zn2(Fbix)3(NO3)2](NO3)2(H2O)3}n (2), which have been characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction. Although the ZnII centers of both 1 and 2 are in a similar tetrahedral coordination geometry, each ZnII ion in 1
is surrounded by two Fbix spacers and two terminal OAc− anions to form a highly undulated chain, whereas each ZnII ion in 2 is embraced by three Fbix ligands and one NO3– anion to result in a two-dimensional cationic network. Since 1 and 2 are synthesized under the same conditions, the structural differences between them are attributable to the difference of the counterions. The solid-state properties such as thermal stability and luminescence of 1 and 2 have also been studied briefly.
Key words: Fluorinated Bis(imidazole) Ligand, ZnII Coordination Polymer, Anion Effect, Crystal Structure, Luminescence Properties