Self-assembly through secondary interactions in formation of two-dimensional lead(II) supramolecular polymer with nanosheets morphology

In order to study the role of self-assembly through secondary interactions in formation of [Pb(3-AB)2]n (1), [3-AB ¼ 3-aminobenzoate], we designed some experiments and synthesized two samples of 1 under ultrasonic irradiations. Nanosheets of 1 were synthesized under these conditions. Compound 1 is a onedimensional coordination polymer. Self-assembly through hydrogen bonding and p-p stacking interactions between these chains results in formation of two-dimensional supramolecular polymer. It seems that self-assembly through secondary interactions between these chain structures is responsible for formation of 1 with nanosheet morphology. Formation nanoparticles of [Pb(2,6-DHB)2]n (2), [2,6- DHB ¼ 2,6-dihydroxybenzoate], under the same condition applied for 1, which has three-dimensional coordination network in its crystalline structure, approved our hypotheses. These microstructures were characterized by IR spectroscopy, X-ray powder diffraction (XRD) and Scanning Electron Microscopy (SEM).