Preparation and Visible-Light Response of Salicylate-Stabilized Heterobimetallic Pb-Ti-Oxo Clusters Initiated via Auxiliary Quaternary Ammonium Salts and a Solvent Effect.

In this study, with the assistance of quaternary ammonium salts we have successfully prepared a new family of salicylate-stabilized heterobimetallic Pb-Ti-oxo clusters, including H(TEA)[PbTi(μ-O)(μ-O)(OPr)(PA)(Sal)(NO)] (; TEA = tetraethylammonium; HOPr = isopropanol; HPA = phenylphosphonic acid; HSal = salicylic acid), {PbTi(μ-O)(μ-O)(OPr)(PA)(Sal)(DMF)·CHCN} (; DMF = dimethylformamide), {PbTi(μ-O)(Sal)(CHCOO)(DMF)(OPr)} (), [PbTi(Sal)(EtO)(OPr)(HOPr)]·CHNH (; EtOH = CHCHOH), H[PbTi(μ-O)(μ-O)(μ-O)(Sal)(OPr)] (), and PbTi(μ-O)(μ-O)(μ-O)(Sal)(OEt) (). Single-crystal X-ray diffraction studies demonstrate that the {TiPb(Sal)} unit acts as the building block to constitute the diverse assembly of . Thereinto, the clusters in and are connected into infinite one-dimensional chains. Furthermore, the solvent effects have facilitated the heterobimetallic Pb-Ti-oxo clusters into various configurations in . Solid-state ultraviolet-visible spectroscopy analysis indicates that the optical absorption bands of these compounds shift effectively toward the visible-light region, and they were also employed as electrode precursors to investigate their visible-light-driven photocurrent response.