Title
Two pairs of Zn(II) coordination polymer enantiomers based on chiral aromatic polycarboxylate ligands: synthesis, crystal structures and properties
Author
Ji-Han Huang, Guang-Feng Hou, Dong-Sheng Ma, Ying-Hui Yu, Wen-Hong Jiang, Qi Huang, Jin-Sheng Gao
Year
2017
Journal
RSC Advances
Abstract
Two pairs of Zn-based chiral coordination polymers (CCPs), namely, [Zn((R)-cbca)·H2O], [Zn((S)-cbca)]·H2O], [Zn((R)-cna)·2H2O] and [Zn((S)-cna)·2H2O] {H2cbca = (R) or (S)-4′-(1-carboxyethoxy)-[1,1′-biphenyl]-4-carboxylic acid, H2cna = (R) or (S)-6-(1-carboxyethoxy)-2-naphthoic acid} were synthesized under hydrothermal conditions. Their structures were determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis, infrared spectroscopy, powder X-ray diffraction, circular dichroism (CD) spectroscopy. CCPs 1–4 crystallized in chiral space groups and the CD spectra demonstrate obvious positive or negative Cotton effects. Second-harmonic generation (SHG) measurements show that CCPs 1–4 are SHG active and the SHG efficiencies are 0.6, 0.6, 0.5 and 0.5 times as much as that of urea, respectively. CCPs 1–4 exhibit relatively high luminescence properties originating from ligand centered emission.
Instrument
J-810
Keywords
Circular dichroism, Solid-state, Stereochemistry, Polymers, Coordination chemistry