A pair of stable Zn(II) enantiomeric coordination compounds: synthesis, crystal structures and luminescent recognition properties.

A pair of stable chiral coordination compounds {[Zn (D -hpg) (bpe)]⋅(NO 3)⋅(C 2 H 6 O)} n 1-D , {[Zn (L -hpg) (bpe)]⋅(NO 3)⋅(C 2 H 6 O)} n 1-L (D -Hhpg = D -(−)-4-Hydroxyphenylglycine, L -Hhpg = L -(+)-4-Hydroxyphenylglycine, bpe = 1,2-bis(4-pyridyl)ethane) have been successfully synthesized. Their structures were determined by single-crystal X-ray diffraction analysis and characterized by elemental analysis, infrared spectroscopy, thermogravimetric analysis and powder X-ray diffraction. Interestingly, they are 2D layer structures that consist of left- or right-handed helical chains, respectively. Circular dichroism and luminescent properties of compounds 1-D and 1-L were investigated at room temperature. Moreover, 1-D and 1-L show similar selectivity toward Cu2+ ions through luminescent quenching in aqueous solution. In addition, 1-D also displays an excellent recognition ability on detecting CH 3 OH. A pair of two-dimensional homochiral coordination compounds {[Zn (D-hpg) (bpe)]⋅ (NO3)⋅(C2H6O)}n 1-D and {[Zn (L-hpg) (bpe)]⋅(NO3)⋅(C2H6O)}n 1-L have been synthesized (D/L-Hhpg = D (−)/L (+)-4-Hydroxyphenylglycine, bpe = 1,2-bis (4-pyridyl)ethane). 1-D and 1-L show luminescent recognition towards Cu2+ ions. In addition, 1-D also displays an excellent recognition ability on detecting CH3OH. Image 1 • There are only a few articles were reported that coordination compounds prepared. • With D -(−)- and L -(+)-4-Hydroxyphenylglycine. • Compounds exhibit 2D layerd and helical structures. • Compounds 1-D and 1-L show luminescence selective recognition properties. [ABSTRACT FROM AUTHOR]