Rational design of lanthanide nano periodic mesoporous organosilicas (Ln-nano-PMOs) for near-infrared emission. Issue 8 (11th February 2021)

• Record Type: Journal Article
• Authors: Liu, Wanlu; Kaczmarek, Anna M.; Folens, Karel; Du Laing, Gijs; Van Der Voort, Pascal; Van Deun, Rik
• Is Part Of: Dalton transactions. Volume 50:Issue 8(2021)
• Page Start: 2774
• Page End: 2781
• Publication Date: 2021-02-11
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1dt00032b
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Three nano-sized Periodic Mesoporous Organosilicas (PMOs) were synthesized and post-modification was employed to two PMOs to introduce Ln 3+ coordination sites. Two PMOs (DPA-PMO and ePMO) showed characteristic NIR (Nd 3+, Yb 3+ ) emission. Abstract : We present three Periodic Mesoporous Organosilica (PMO) materials: a PMO material functionalized with pyridine dicarboxamide (DPA-PMO) and two amine functionalized PMO materials (Am-PMO and Am-ePMO). The pyridine dicarboxamide ligands in the DPA-PMO material provide the tethering sites for Ln 3+ -coordination. A Schiff base reaction was carried out on the amine functionalized PMOs to introduce similar lanthanide coordination sites. The Nd and Yb modified nano-PMOs are evaluated as near-infrared (NIR) emitting luminescent materials. The DPA-PMO and Am-ePMO materials can act as good platforms for NIR luminescence. A significant enhancement in the decay time can be observed upon grafting an Yb(hfa)3 complex to the PMO materials instead of YbCl3 . All of the DPA-PMO@Ln(hfa)3 and Am-ePMO@Ln(hfa)3 materials show characteristic NIR emission performance both in the solid state and in aqueous suspension.