Title: Anthracene-Based Lanthanide Metal-Organic Frameworks: Synthesis, Structure, Photoluminescence, and Radioluminescence Properties

Abstract

Four anthracene-based lanthanide metal-organic framework structures (MOFs) were synthesized from the combination of the lanthanide ions, Eu³⁺, Tb³⁺, Er³⁺, and Tm³⁺, with 9,10-anthracenedicarboxylic acid (H₂ADC) in dimethylformamide (DMF) under hydrothermal conditions. The 3-D networks crystalize in the triclinic system with P-1 space group with the following compositions: (i) {{[Ln₂(ADC)₃(DMF)₄·DMF]}_n, Ln = Eu (1) and Tb (2)} and (ii) {{[Ln₂(ADC)₃(DMF)₂(OH₂)₂·2DMF·H₂O]}_n, Ln = Er (3) and Tm (4)}. The metal centers exist in various coordination environments; nine coordinate in (i), while seven and eight coordinate in (ii). The deprotonated ligand, ADC, assumes multiple coordination modes, with its carboxylate functional groups severely twisted away from the plane of the anthracene moiety. The structures show ligand-based photoluminescence, which appears to be significantly quenched when compared with that of the parent H₂ADC solid powder. Structure 2 is the least quenched and showed an average photoluminescence lifetime from bi-exponential decay of 0.3 ns. On exposure to ionizing radiation, the structures show radioluminescence spectral features that are consistent with the isolation of the ligand units in its 3-D network. The spectral features vary among the 3-D networks and appear to suggest that the latter undergo significant changes in their molecular and/or electronic structure in the presence ofmore » the ionizing radiation.« less

Authors:

Mathis, II, Stephan; Golafale, Saki; Solntsev, Kyril; Ingram, Conrad

Publication Date:

Mon Jan 22 00:00:00 EST 2018

Research Org.:

Clark Atlanta Univ., Atlanta, GA (United States); Univ. of California, Riverside, CA (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1422449

Alternate Identifier(s):

OSTI ID: 1507356

Grant/Contract Number:  

NA0000979; FE0022952

Resource Type:

Published Article

Journal Name:

Crystals

Additional Journal Information:

Journal Name: Crystals Journal Volume: 8 Journal Issue: 1; Journal ID: ISSN 2073-4352

Publisher:

MDPI AG

Country of Publication:

Germany

Language:

English

Subject:

36 MATERIALS SCIENCE; lanthanide coordination polymers; crystal structures; metal-organic framework fluorescence; radioluminescence; lanthanide metal-organic framework; lanthanide anthracene dicarboxylate coordination polymers