Binary and Ternary Metal–Organic Hybrid Polymers in Aqueous Lead(II)–Dicarboxylic Acid–(Phen) Systems. The Influence of O- and S‑Ligand Heteroatoms on the Assembly of Distinct Lattice Architecture, Dimensionality, and Spectroscopic Properties

Poised
to understand the influence of O- and S-heteroatoms on the
chemical reactivity of dicarboxylic acids toward Pb­(II), leading to
crystalline metal–organic hybrid materials with distinct lattice
architecture, dimensionality, and spectroscopic properties, the synthesis
and physicochemical properties of binary/ternary Pb­(II)–(O,S)-dicarboxylic
acid–(phenanthroline) systems was investigated in aqueous media.
pH-specific hydrothermal reactions of Pb­(II) with O- and S-dicarboxylic
acid ligands and phenanthroline (phen) afforded the variable dimensionality
metal–organic Pb­(II) polymers [Pb3(oda)3]n (1), [Pb­(phen)­(oda)]n (2), [Pb­(tda)]n (3), and [Pb­(phen)­(tda)]n (4). The choice of O- vs S-ligands
in the aqueous systems of Pb­(II) and phenanthroline is linked to the
emergence of distinct lattice composition–dimensionality (2D–3D)
changes at the binary and ternary level, bestowing spectroscopic fingerprint
identity to Pb­(II) coordination and luminescence activity.