Resorufin in the channels of zeolite L

Article Abstract:

The preparation of the zeolite L possessing the resorufin anion (Res-) in its anionic framework was undertaken by including the neutral resorufin molecule (ResH) from the gas phase and then transferring the protons with potassium ions resulting to dark violet colored microcrystals. The extended Huckel molecular orbital method coupled with the ICON-EdiT program package were used in estimating the molecular orbital and oscillator strength. It was revealed that the distinct ultraviolet/vis absorption spectra of Res- and ResH were effective in differentiating the two forms of dye molecule.

Chemistry, Anions, Dyes and dyeing, Molecular spectra, Dye chemistry

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Fast energy migration in pyronine-loaded zeolite L microcrystals

Article Abstract:

A study was conducted to analyze energy migration in pyronine-loaded zeolite L microcrystals. The Perkin-Elmer Lambda 14 spectrophotometer was utilized to determine ultraviolet/vis absorption spectra. Results indicated that fast electronic excitation energy migration occurs along the axis of cylindrical crystals. In addition, the migration correlates with increases in the effective excitation lifetime caused by self-absorption and re-emission of the pyronine vertical to the cylinder axis.

Analysis, Crystals, Collisional excitation

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Quantum-sized silver sulfide clusters in a zeolite A

Article Abstract:

Silver sulfide zeolite A composites are formed when H2S is reacted with Ag+-loaded zeolite A and their optical absorption and emission spectra are obtained in the size regime below 15 angstrom. Their loading densities are 0.05, 0.10, 0.25, 0.50, 1, 1.25, 1.50, 1.75 and 2 silver ions per pseudo unit of cell zeolite. Samples with low, medium and high silver sulfide content have luminescence of blue-green, yellow or orange, and red, respectively.

Silver compounds, Sulfur compounds, Complex compounds, Coordination compounds

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