Two pairs of chiral cobalt enantiomeric coordination compounds based on D-(-)-/L-(+)-4-hydroxyphenylglycine:Synthesis,crystal structures,and electrochemical recognition
Two pairs of chiral coordination compounds {[Co(D-hpg)(4,4'-bipy)(H2O)]Cl·H2O}n(1-D),{[Co(L-hpg)(4,4'-bipy)(H2O)]Cl·H2O}n(1-L),[Co(D-hpg)2(5,5'-BM-2,2'-bipy)]Cl·5.5H2O(2-D),and[Co(L-hpg)2(5,5'-BM-2,2'-bipy)]Cl·5.5H2O(2-L),where D-Hhpg=D-(-)-4-hydroxyphenylglycine,L-Hhpg=L-(+)-4-hydroxyphenylglycine,4,4'-bipy=4,4'-bipyridine,5,5'-BM-2,2'-bipy=5,5'-dimethyl-2,2'-bipyridine,have been successfully synthesized.Their struc-tures were determined by single-crystal X-ray diffraction analysis and characterized by elemental analysis,X-ray photoelectron spectra,infrared spectroscopy,solid-state circular dichroism spectra,thermogravimetric analysis,pow-der X-ray diffraction,and electrochemical methods.Compounds 1-D and 1-L feature 2D(4,4)rectangular grid net-works that consist of left-or right-handed helical chains.Compounds 2-D and 2-L exhibit OD molecule structures,and further 1D supramolecular double chains are formed by hydrogen bonding.The differences in the structures of these compounds are attributed to the influence of ancillary N-donor ligands and the coordination modes of Hhpg.Moreover,compound 1-D displays electrochemically reversible redox behavior,and serves as an electrochemical sensor for efficiently detecting histidine(His)enantiomers and quantitatively determining the enantiomeric excess in the His mixture.CCDC:2124681,1-D;2124682,1-L;2124683,2-D.
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