Field-Induced SMM and Vis/NIR Luminescence on Mononuclear Lanthanide Complexes with 9-Anthracenecarboxylate and 2,2′:6,2″-Terpyridine

• Main Authors: Berta Casanovas, Oriol Porcar, Saskia Speed, Ramon Vicente, Mercè Font-Bardía, Mohamed Salah El Fallah
• Format: Article
• Language: English
• Published: MDPI AG 2021-09-01
• Series: Magnetochemistry
• Subjects: lanthanide(III) ions; coordination compounds; single-molecule magnets; luminescence
• Online Access: https://www.mdpi.com/2312-7481/7/9/124

Five new mononuclear lanthanide complexes are synthesized by adding the several lanthanide nitrate hexahydrate salts, which for lanthanide (Ln) are Eu, Tb, Dy, Er, and Yb, with 9-anthracenecarboxylic acid (9-Hanthc) and 2,2′:6,2″-terpyridine (TPY) in mixed solution of methanol and dimethylformamide (DMF). The general formula is [Eu(9-anthc)₃(TPY)(DMF)]·H₂O (<b>1Eu</b>) where Eu(III) is ennea-coordinated or [Ln(9-anthc)₃(TPY)(H₂O)]·H₂O·DMF (Ln = Tb (<b>2Tb</b>), Dy (<b>3Dy</b>), Er (<b>4Er</b>), and Yb (<b>5Yb</b>)) where Ln(III) is octa-coordinated. For compounds <b>3Dy</b>, <b>4Er</b>, and <b>5Yb</b>, the dynamic <i>ac</i> magnetic study indicated field-induced single molecule magnet (SMM) behavior. The photoluminescence studies in the solid state of these complexes show the sensitization of 4<i>f</i>-4<i>f</i> transitions for <b>4Er</b> and <b>5Yb</b> in the NIR region.