Anion-directed assembly of supramolecular zinc(II)halides with N,N'-bis-4-methyl-pyridyl oxalamide

摘要

We report here the supramolecular structures and solid state luminescence of zinc(II)halides with N,N'-bis-4-methyl-pyridyl oxalamide(L),where the supramolecular assembly formed is dependent on the halide,and led to the formation of one-dimensional coordination polymers for Cl([ZnCl_2(L)]_n)and Br([ZnBr_2(L)]_n)or a discrete macrocycle for I([ZnI_2(L)]_2),respectively.The rectangular structure of iodo compounds with pyridyl amide L shows an interesting nanotube framework built from pi …pi interactions in combination with hydrogen bonding.To our knowledge,these are rare examples of the anion-directed assembly of supramolecular structures.The low energy emission at ca.500 nm for [ZnI_2(L)]_2 is assigned to a ligand-to-metal charge-transfer(LMCT)transition.