Reversible solid–gas and solid–solid transformation of lead(II)–phenylalanine coordination polymers
Abstract A reversible crystal to crystal structural transformation of lead(II) complex; [Pb(OH2)2(Phe)2(NO3)]n[NO3] (1), (Phe:L-phenylalanine), to coordination polymer 2D [Pb(phe)2]n (2); has been observed upon solid–gas and solid–solid reactions of compound 1 to compound 2 and then 2 to 1. A lead(II) supramolecular (1), polymerizes on grinding the solid with 1 mmol NaOH and also with NH3 vapors to form the 2D coordination polymer (2). Solid–gas reaction has been verified by PXRD and IR spectroscopy. Pb3O4 and mixture phase of PbO nanoparticles were obtained by thermal decomposition of compounds 1 and 2 by direct calcinations at 400 °C for 4 h. These nanoparticles were characterized by powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM).