Crystal Engineering of Schiff Base Zn(II) and Cd(II) Homo- and Zn(II)M(II) (M = Mn or Cd) Heterometallic Coordination Polymers and Their Ability to Accommodate Solvent Guest Molecules

Based on solvothermal synthesis, self-assembly of the heptadentate 2,6-diacetylpyridine bis(nicotinoylhydrazone) Schiff base ligand (H L) and Zn(II) and/or Cd(II) salts has led to the formation of three homometallic [CdL] ( ), {[CdL]∙0.5dmf∙H O} ( ) and {[ZnL]∙0.5dmf∙1.5H O} ( ), as well as two heterometallic {[Zn Cd L ]∙dmf∙0.5H O} ( ) and {[MnZnL ]∙dmf∙3H O} coordination polymers. Compound represents a 1D chain, whereas - are isostructural and isomorphous two-dimensional structures. The entire series was characterized by IR spectroscopy, thermogravimetric analysis, single-crystal X-ray diffraction and emission measurements. 2D coordination polymers accommodate water and dmf molecules in their cage-shaped interlayer spaces, which are released when the samples are heated. Thus, three solvated crystals were degassed at two temperatures and their photoluminescent and adsorption-desorption properties were recorded in order to validate this assumption. Solvent-free samples reveal an increase in volume pore, adsorption specific surface area and photoluminescence with regard to synthesized crystals.