Highly efficient syntheses of nano mixed-anions lead(II) thiocyanate/nitrate and lead(II) thiocyanate coordination polymers by sonochemical process

• Two nano-lead(II) coordination polymers have been synthesized with sonochemistry method.
• Three different concentrations of initial reagents, 0.2, 0.1 and 0.05 M were tested.
• Appropriate nano-sized of compounds obtained at a concentration of 0.05 M.
• The solid state structural transformations of nano-compounds 1, 2 by anion-replacement have been done.
• Sometimes morphology change occurs during solid state anion-replacements of nanocrystals.

Nanostructures of the three-dimensional coordination polymers with the ligand 2,5-bis(4-pyridyl)-3,4-diaza-2,4-hexadiene (4-bpdh), [Pb(4-bpdh)(NO3)(μ-NCS)]n (1) and [Pb(4-bpdh)(μ-NCS)2]n (2), have been synthesized by a sonochemical process at different concentrations and characterized by scanning electron microscopy, X-ray powder diffraction, IR spectroscopy and elemental analyses. The solid state structural transformations of nano-compounds 1, 2 by anion-replacement processes under mechanochemical reaction, have been verified by IR and PXRD measurements. The SEM images showed that morphology change occurs on nanostructures during solid state anion-replacements.