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Pt(II)-A2B2 metalloporphyrin-AuNPS hybrid material suitable for optical detection of 1-anthraquinonsulfonic acid

Ionela Fringu, Anca Lascu, Ana-Maria Macsim, Ion Fratilescu, Camelia Epuran, Mihaela Birdeanu, and Eugenia Fagadar-Cosma

Institute of Chemistry, Coriolan Dragulescu” of Romanian Academy, Timisoara, Romania



Received: 28 September 2021  Accepted: 25 December 2021


A new A2B2-type porphyrin, namely: 5,15-bis-(3-hydroxyphenyl)-10,20-bis(3-methoxyphenyl)-porphyrin (trans-A2B2-porphyrin), and its platinum(II) derivative (Pt-trans-A2B2-porphyrin) were synthesized and completely characterized by UV–vis, FT-IR, 1H-NMR, 13C-NMR and AFM methods. The Pt-metalloporphyrin was complexed with colloidal gold (AuNPs) and the obtained nanomaterial (Pt-trans-A2B2-AuNPs) was able to optically detect the potassium salt of 1-anthraquinonsulfonic acid (AQ) in the concentration range 2.419 × 10–8 M to 2.5 × 10–7 M with relevance in medical investigations of microbial, congestive and cancer diseases, in diabetes and pancreatic fibrosis. The tested interfering species, selected from those usually present in physiological media, did not strongly influence the detection capacity of the complex nanomaterial toward AQ, even if the used concentrations are 50 times higher than that of the detected AQ. The AFM images of Pt-trans-A2B2-porphyrin, Pt-trans-A2B2-AuNPs and the hybrid material after 1-anthraquinonsulfonic acid detection (Pt-trans-A2B2-AuNPs-AQ) show significant morphologic differences from an uneven coverage with conical aggregates and holes having various sizes in the case of Pt-trans-A2B2-porphyrin, to columnar aggregates in the case of Pt-trans-A2B2-AuNPs hybrid material and finally to a relatively uniform distribution of self-assemblies for Pt-trans-A2B2-AuNPs after interacting with AQ, having lower dimensions than those of the used hybrid material. The detection mechanism was proposed and justified.

Graphical abstract

Keywords: A2B2–porphyrin; Platinum metalloporphyrin; AuNPs; Hybrid material Pt-porphyrin-AuNPs; 1-Anthraquinonsulfonic acid; Optical detection

Full paper is available at

DOI: 10.1007/s11696-021-02047-2


Chemical Papers 76 (4) 2513–2527 (2022)

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