green synthesis and characterization of zinc pyridine-2,6-dicarboxylate complex and preparation of nano-zno by thermal decomposition

A complex [zn(hpda)2]·2h2o of pyridine-2,6-dicarboxylic acid (h2pda) was synthesizedby a green chemistry approach, namely, room-temperature solid-state reaction. the complex was characterized by elemental analyses, powder x-ray diffraction (pxrd), single crystal x-ray diffraction, fourier transform infrared (ft-ir) spectroscopy, and thermogravimetry and differential scanning calorimetry (tg-dsc). the pxrd result confirmed that the unpurified powder complex was a single phase. the crystal structure of the complex belonged to the monoclinic systemwith space group p21/c, and the zn(ii) ion was hexacoordinated by four o atoms and two n atoms.the thermal decomposition of the complex was investigated and the nano-zno particles were prepared by pyrolysis of the unpurified powder complex as the precursor. the zno particle obtained by pyrolysis at 500 °c was characterized by pxrd and scanning electron microscope(sem), and its average diameter was about 40 nm.