Fluorescence Properties of Penta‐ and Hexacoordinate Coumarin Silicates – Unusual Behavior of Sodium Tris(4‐methylcoumarin‐6,7‐diolato)silicate in Solvent Mixtures

Fluorescent penta‐ and hexacoordinate silicates were synthesized from 6,7‐dihydroxy‐4‐methylcoumarin (4‐methylesculetin, 4‐ME), tetramethyl orthosilicate and substituted aminopropylsilanes, respectively. Extinction coefficients, Stokes shifts, and quantum yields of fluorescence were determined and c...

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Bibliographic Details
Published in:	Zeitschrift für anorganische und allgemeine Chemie (1950) Vol. 635; no. 9‐10; pp. 1335 - 1340
Main Authors:	Riedel, Franziska, Oehlke, Alexander, Spange, Stefan
Format:	Journal Article
Language:	English
Published:	Weinheim WILEY‐VCH Verlag 01-07-2009
Subjects:	Chelates Coumarin Fluorescence spectroscopy Hypercoordination Silicon Solvent effects
Online Access:	Get full text
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Summary:	Fluorescent penta‐ and hexacoordinate silicates were synthesized from 6,7‐dihydroxy‐4‐methylcoumarin (4‐methylesculetin, 4‐ME), tetramethyl orthosilicate and substituted aminopropylsilanes, respectively. Extinction coefficients, Stokes shifts, and quantum yields of fluorescence were determined and compared with 4‐ME. Optical properties of these compounds are sensitive to the polarity of solvents. The fluorescence quenching was investigated in methanol/water mixtures. The title compound sodium tris(4‐methylcoumarin‐6,7‐diolato)silicate (4) shows different behavior from all other compounds investigated.
Bibliography:	Dedicated to Professor Robert Corriu on the Occasion of His 75th Birthday
ISSN:	0044-2313 1521-3749
DOI:	10.1002/zaac.200900071