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Structural and Photophysical Modulation of Au(I)-Pb(II) Chains by Solvent Inclusion: A Study of Solvatopolymorphs
David Royo1, Sonia Moreno1, María Rodríguez-Castillo1
1Departamento de Química, Instituto de Investigación en Química (IQUR), Complejo Científico Tecnológico, Universidad de La Rioja, Madre de Dios 53, 26006 Logroño, Spain.
Abstract:
This work presents the synthesis, structural characterization, and photophysical studies of a new gold-(I)-lead-(II) heterometallic polymeric complex, [{Au-(C6F5)2}2{Pb-(S-Terpy)}] n , and its solvatopolymorphs incorporating acetone and diethyl ether. The complex exhibits reversible solvatochromic behavior with significant changes in color and luminescence upon solvent inclusion. X-ray diffraction reveals that the trinuclear Au-Pb-Au units are maintained across all solvatopolymorphs, although the packing and intermetallic distances vary depending on the solvent and its coordination mode. Optical studies show that the complexes emit in the visible to near-infrared region, with emission properties strongly influenced by the nature of the solvent. DFT and TD-DFT reveal that the emission arises from metal-to-ligand or ligand-to-ligand charge transfer transitions, depending on the structure. These results highlight the potential of gold-lead supramolecular systems as responsive luminescent materials for sensing applications.
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