Reversible solid state structural transformation of a polyhapto lead(ii) polymeric chain to a tetrahapto lead(ii) two-dimensional network by thermal dehydration with no change in nanoplate morphology

Abstract

A reversible solid state structural transformation of a new 1D lead(II) coordination polymer [Pb(MPOAc)₂(H₂O)]_n (1), (MPOAc⁻: mono phenyl acetate) involving in situ ligand synthesis with O₇Pb⋯C₆ coordination sphere to a 2D supramolecular network [Pb(MPOAc)₂]_n (2) with O₆Pb⋯C₄ coordination environment has been observed upon heating and dehydration. This change in coordination-mode was confirmed by single-crystal X-ray diffraction analyses of compounds 1 and 2. Thermogravimetric (TG) and differential thermal analyses (DTA) were employed to study the thermal stabilities of compounds 1 and 2. Powder X-ray diffraction experiments showed that the structural transformation occurs in the batch powder samples and lead to monophasic products. Nanoplates of compound 1 were synthesized by a microwave-assisted process and characterized by scanning electron microscopy (SEM), powder X-ray diffraction, IR spectroscopy and elemental analyses. The SEM images showed that no morphology change occurs during this solid state structural transformation.