Synthesis and photothermal conversion properties of sandwich N-fused porphyrin rhodium- μ-dichloride dimer complexes: π-extended analog of pentamethylcyclopentadienyl dirhodium(III)-μ-dichloride dimer

J Inorg Biochem. 2023 Nov 22;251:112435. doi: 10.1016/j.jinorgbio.2023.112435. Online ahead of print.ABSTRACTAnionic cyclopentadienyl (Cp) and its pentamethyl-substituted derivative (Cp*) serve as crucial ligands for creating stable π-coordinated materials, including catalysts. From a structural perspective, the π-extended analog of Cp, known as an N-fused porphyrin (NFP), is recognized as an intriguing 18π aromatic chromophore, offering near-infrared (NIR) optical properties that can be fine-tuned through metal complexation. When coordinated with rhodium at the central NFP core, it forms a sandwich binuclear rhodium(III) complex along with terminal and bridging chloride ligands, denoted as Rh-1, and its bromo derivative, Rh-1-Br. In contrast to the bis-NFP complex of iron(II) reported previously by our team, both Rh-1 and Rh-1-Br complexes exhibit strong NIR optical properties and narrow HOMO-LUMO energy gaps, attributed to minimal orbital interactions between the two co-facial NFP ligands. Leveraging these NIR absorption properties, we assessed the photothermal conversion properties of Rh-1 and ligand 1, revealing high conversion efficiency. This suggests their potential application as photothermal agents for use in photothermal therapy.PMID:38016327 | DOI:10.1016/j.jinorgbio.2023.112435

Source: Journal of Inorganic Biochemistry - November 28, 2023 Category: Biochemistry Authors: Jibin Alex Abraham Hidetoshi Tsuruda Shigeki Mori Masatoshi Ishida Hiroyuki Furuta Source Type: research