期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 21, 期 23, 页码 8409-8415出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1jm00067e
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资金
- National Science Foundation [CHE 0718879]
Solid-state difluoroboron beta-diketonate dyes display reversible mechanochromic luminescence (ML). To test the effects of alkyl chain length on solid state photoluminescence and ML, a series of dyes, BF(2)dbmOR, with dibenzoylmethane (dbm) ligands and alkoxyl substituents (-OR) were prepared, where R CnH2n+1 and n = 1, 2, 3, 5, 6, 12, 14, 16, 18. Emission properties were investigated in solution and in the solid state. Fluorescence spectra and lifetimes were nearly identical for dyes in CH2Cl2 solution; whereas, in the solid state, as powders, thin films or spin cast films, emission maxima, and lifetimes were different among the samples. Solid-state ML emission spectra were monitored at room temperature as a function of time for smeared powders on quartz surfaces. The recovery time generally increased with alkyl chain length, ranging from minutes (n = 3) to days (n = 18). Longer chain analogues (n = 6, 12, 14, 16, 18) did not fully return to the original annealed emissive state even after months on quartz, though the dynamics are substrate dependent. Solid-state dyes were also investigated by XRD and DSC (powders), and by AFM (spin cast films).
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