| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1305330 | Inorganic Chemistry Communications | 2015 | 5 Pages |
•Assembly of l- and d-threonine Schiff bases with Zn2 + gave a pair of enantiomers.•Compound 1 exhibits a 1D right-handed helical chain and 2 is left-handed.•Both complexes exhibit 2D homochiral supramolecular structures via hydrogen bonds.•1 and 2 exhibit blue shift behavior and enhanced luminescence phenomenon.
Two novel homochiral helical Zn(II) coordination polymers, {[Zn2(nap-l-thr)2(H2O)2]·H2O}n (1) and {[Zn2(nap-d-thr)2(H2O)2]·H2O}n (2) (H2nap-l-thr = N-(2-hydroxy-1-naphthylmethylidene)-l-threonine, H2nap-d-thr = N-(2-hydroxy-1-naphthylmethylidene)-d-threonine) have been successfully synthesized and characterized by elemental analysis, IR, UV–visible and single-crystal X-ray diffraction. It is interesting to note that both complexes are a pair of enantiomers: 1 exhibits 1D right-handed helical chain of [Zn-COO−]∞ and 2 is 1D left-handed helical chain of [Zn-COO−]∞. There are various hydrogen bonds between the adjacent helical chains which result in a 2D homochiral supramolecular layer structure. Notably, under similar synthetic procedure by using the NO3−, CH3COO−, Cl− salts of Zn2 + ion as a starting reagent, and identical compounds were obtained. In addition, the chiral nature of complexes 1 and 2 are confirmed by the results of circular dichroism (CD) spectra measurements. Thermal stability and luminescence properties were also investigated.
Graphical abstractA pair of enantiomers of Zn(II) coordination polymers have been constructed from l- and d-threonine Schiff bases, and two Zn(II) complexes 1 and 2 exhibit interesting 1D right- and left-handed helical chains, respectively. Both complexes were characterized by X-ray crystallography, PXRD, TGA, CD measurements and luminescence properties.Figure optionsDownload full-size imageDownload as PowerPoint slide
