期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 23, 期 1, 页码 -出版社
MDPI
DOI: 10.3390/ijms23010330
关键词
hybrid materials; host-guest interaction; aggregates; time-resolved spectroscopy; luminescent vapochromic sensing
资金
- I+D+I projects [PID2020-116519RB-I00, MAT2017-86532-R, PID2020-112590GB-C21/AEI/10.13039/501100011033]
- JCCM [SBPLY/19/180501/000212 a]
- UCLM [2020-GRIN-28929 (Feder),]
- EU through Fondo Social Europeo Plus (FSE+)
- [SBPLY/19/180501/000212]
- [2020-GRIN-28929]
In this study, the solid-state photodynamical properties and applications of a low dimensional composite material, DCM/Al-ITQ-HB, were investigated. The absorption and emission spectra of the composites reflected different species of DCM molecules and exhibited heterogeneity. Additionally, the fluorescence of DCM/Al-ITQ-HB was found to be sensitive to vapors of electron donor aromatic amine compounds, indicating its potential application in sensing aniline derivatives.
In this contribution, we report on the solid-state-photodynamical properties and further applications of a low dimensional composite material composed by the luminescent trans-4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM) dye interacting with a two-dimensional-metal organic framework (2D-MOF), Al-ITQ-HB. Three different samples with increasing concentration of DCM are synthesized and characterized. The broad UV-visible absorption spectra of the DCM/Al-ITQ-HB composites reflect the presence of different species of DCM molecules (monomers and aggregates). In contrast, the emission spectra are narrower and exhibit a bathochromic shift upon increasing the DCM concentration, in agreeance with the formation of adsorbed aggregates. Time-resolved picosecond (ps)-experiments reveal multi-exponential behaviors of the excited composites, further confirming the heterogeneous nature of the samples. Remarkably, DCM/Al-ITQ-HB fluorescence is sensitive to vapors of electron donor aromatic amine compounds like aniline, methylaniline, and benzylamine due to a H-bonding-induced electron transfer (ET) process from the analyte to the surface-adsorbed DCM. These findings bring new insights on the photobehavior of a well-known dye when interacting with a 2D-MOF and its possible application in sensing aniline derivatives.
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