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Issue 24, 2017
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Temperature dependent NIR emitting lanthanide-PMO/silica hybrid materials

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Abstract

Two materials – a mesoporous silica (MS) and a periodic mesoporous organosilica (PMO) functionalized with dipyridyl-pyridazine (dppz) units were grafted with near-infrared (NIR) emitting lanthanide (Nd3+, Er3+, Yb3+) complexes in an attempt to obtain hybrid NIR emitting materials. The parent materials: dppz-vSilica and dppz-ePMO were prepared by a hetero Diels–Alder reaction between 3,6-di(2-pyridyl)-1,2,4,5-tetrazine (dptz) and the double bonds of either ethenylene-bridged PMO (ePMO) or vinyl-silica (vSilica) and subsequent oxidation. The dppz-vSilica is reported here for the first time. The prepared lanthanide-PMO/silica hybrid materials were studied in depth for their luminescence properties at room temperature and chosen Nd3+ and Yb3+ samples also at low temperature (as low as 10 K). We show that both the dppz-vSilica and dppz-ePMO materials can be used as “platforms” for obtaining porous materials showing NIR luminescence. To obtain NIR emission these materials can be excited either in the UV or Vis region (into the π → π* transitions of the ligands or directly into the f–f transitions of the Ln3+ ions). More interestingly, when functionalized with Nd3+ or Yb3+ β-diketonate complexes these materials showed interesting luminescence properties over a wide temperature range (10–360 K). The Yb3+ materials were investigated for their potential use as ratiometric temperature sensors.

Graphical abstract: Temperature dependent NIR emitting lanthanide-PMO/silica hybrid materials

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Publication details

The article was received on 03 May 2017, accepted on 05 Jun 2017 and first published on 09 Jun 2017


Article type: Paper
DOI: 10.1039/C7DT01620D
Citation: Dalton Trans., 2017,46, 7878-7887
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    Temperature dependent NIR emitting lanthanide-PMO/silica hybrid materials

    A. M. Kaczmarek, D. Esquivel, J. Ouwehand, P. Van Der Voort, F. J. Romero-Salguero and R. Van Deun, Dalton Trans., 2017, 46, 7878
    DOI: 10.1039/C7DT01620D

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